LeetCode in Kotlin

“For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby.”

• Algorithm I
• Algorithm II
• Binary Search I
• Binary Search II
• Dynamic Programming I
• Programming Skills I
• Programming Skills II
• Graph Theory I
• SQL I
• Level 1
• Level 2
• Udemy
• Data Structure I
• Data Structure II

Algorithm I

Day 1 Binary Search

0704	Binary Search	Easy	Top_100_Liked_Questions, Array, Binary_Search	261	77.91
0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	159	93.03

Day 2 Two Pointers

0977	Squares of a Sorted Array	Easy	Array, Sorting, Two_Pointers	271	77.17
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	483	86.95

Day 3 Two Pointers

0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	516	79.07
0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers	403	68.74

Day 4 Two Pointers

0344	Reverse String	Easy	String, Two_Pointers, Recursion	445	69.75
0557	Reverse Words in a String III	Easy	String, Two_Pointers	215	98.10

Day 5 Two Pointers

0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L)	144	96.28

Day 6 Sliding Window

0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task	201	87.28
0567	Permutation in String	Medium	Top_100_Liked_Questions, String, Hash_Table, Two_Pointers, Sliding_Window	169	100.00

Day 7 Breadth First Search Depth First Search

0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	230	97.76
0695	Max Area of Island	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	181	93.83

Day 8 Breadth First Search Depth First Search

0617	Merge Two Binary Trees	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	243	72.83
0116	Populating Next Right Pointers in Each Node	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	355	69.02

Day 9 Breadth First Search Depth First Search

0542	01 Matrix	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	441	94.06
0994	Rotting Oranges	Medium	Top_100_Liked_Questions, Array, Breadth_First_Search, Matrix	164	82.95

Day 10 Recursion Backtracking

0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	157	92.24
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	279	45.78

Day 11 Recursion Backtracking

0077	Combinations	Medium	Backtracking	232	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!)	188	99.00
0784	Letter Case Permutation	Medium	String, Bit_Manipulation, Backtracking	219	84.62

Day 12 Dynamic Programming

0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	124	71.98
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	156	92.24
0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87

Day 13 Bit Manipulation

0231	Power of Two	Easy	Math, Bit_Manipulation, Recursion	161	86.81
0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44

Day 14 Bit Manipulation

0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer	198	81.82
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1)	344	83.63

Algorithm II

Day 1 Binary Search

0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	174	100.00
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	151	93.77
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	159	74.46

Day 2 Binary Search

0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N)	262	60.96
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search	297	53.85

Day 3 Two Pointers

0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List	166	89.47
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	493	93.45

Day 4 Two Pointers

0844	Backspace String Compare	Easy	String, Two_Pointers, Stack, Simulation	126	98.31
0986	Interval List Intersections	Medium	Array, Two_Pointers	318	60.98
0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	402	78.57

Day 5 Sliding Window

0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1)	561	54.68
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window	336	92.11
0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	315	96.73

Day 6 Breadth First Search Depth First Search

0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	252	95.41
0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	229	79.73

Day 7 Breadth First Search Depth First Search

0117	Populating Next Right Pointers in Each Node II	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	199	94.67
0572	Subtree of Another Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching	214	92.39

Day 8 Breadth First Search Depth First Search

1091	Shortest Path in Binary Matrix	Medium	Array, Breadth_First_Search, Matrix	305	98.28
0130	Surrounded Regions	Medium	Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	355	84.42
0797	All Paths From Source to Target	Medium	Depth_First_Search, Breadth_First_Search, Graph, Backtracking	232	100.00

Day 9 Recursion Backtracking

0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n)	171	94.92
0090	Subsets II	Medium	Array, Bit_Manipulation, Backtracking	200	88.33

Day 10 Recursion Backtracking

0047	Permutations II	Medium	Array, Backtracking	199	100.00
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n)	226	88.89
0040	Combination Sum II	Medium	Array, Backtracking	217	93.75

Day 11 Recursion Backtracking

0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n)	155	95.24
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n)	161	85.45
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n)	392	72.92

Day 12 Dynamic Programming

0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	332	89.35

Day 13 Dynamic Programming

0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	208	93.37
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n)	118	94.65

Day 14 Dynamic Programming

0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	162	99.00
0413	Arithmetic Slices	Medium	Array, Dynamic_Programming	156	100.00

Day 15 Dynamic Programming

0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming	148	79.07
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max)	197	87.17

Day 16 Dynamic Programming

0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	318	82.28
0673	Number of Longest Increasing Subsequence	Medium	Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree	226	91.67

Day 17 Dynamic Programming

1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	307	38.36
0583	Delete Operation for Two Strings	Medium	String, Dynamic_Programming	197	100.00

Day 18 Dynamic Programming

0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	182	92.16
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	332	50.68
0343	Integer Break	Medium	Dynamic_Programming, Math	218	63.89

Day 19 Bit Manipulation

0201	Bitwise AND of Numbers Range	Medium	Bit_Manipulation	368	80.00

Day 20 Others

0384	Shuffle an Array	Medium	Array, Math, Randomized	940	72.09

Day 21 Others

0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
0149	Max Points on a Line	Hard	Top_Interview_Questions, Array, Hash_Table, Math, Geometry	307	83.33

Binary Search I

Day 1

0704	Binary Search	Easy	Top_100_Liked_Questions, Array, Binary_Search	261	77.91
0374	Guess Number Higher or Lower	Easy	Binary_Search, Interactive	134	94.19

Day 2

0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	159	93.03
0852	Peak Index in a Mountain Array	Medium	Array, Binary_Search	433	94.29

Day 3

0367	Valid Perfect Square	Easy	Math, Binary_Search	137	94.55
1385	Find the Distance Value Between Two Arrays	Easy	Array, Sorting, Binary_Search, Two_Pointers	190	84.62

Day 4

0069	Sqrt(x)	Easy	Top_Interview_Questions, Math, Binary_Search	140	94.72
0744	Find Smallest Letter Greater Than Target	Easy	Array, Binary_Search	162	100.00

Day 5

0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	174	100.00

Day 6

0441	Arranging Coins	Easy	Math, Binary_Search	150	84.21
1539	Kth Missing Positive Number	Easy	Array, Binary_Search	153	100.00

Day 7

0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers	403	68.74
1608	Special Array With X Elements Greater Than or Equal X	Easy	Array, Sorting, Binary_Search	147	81.82

Day 8

1351	Count Negative Numbers in a Sorted Matrix	Easy	Array, Binary_Search, Matrix	206	71.43
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	159	74.46

Day 9

1337	The K Weakest Rows in a Matrix	Easy	Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue	216	77.59
1346	Check If N and Its Double Exist	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	175	70.83

Day 10

0350	Intersection of Two Arrays II	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	321	73.37
0633	Sum of Square Numbers	Medium	Math, Binary_Search, Two_Pointers	126	100.00

Day 11

1855	Maximum Distance Between a Pair of Values	Medium	Array, Greedy, Binary_Search, Two_Pointers	458	100.00
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	151	93.77

Day 12

0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N)	262	60.96

Binary Search II

Day 1

0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	315	96.73
0611	Valid Triangle Number	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers	203	100.00

Day 2

0658	Find K Closest Elements	Medium	Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue	375	95.16
1894	Find the Student that Will Replace the Chalk	Medium	Array, Binary_Search, Simulation, Prefix_Sum	520	50.00

Day 3

0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	318	82.28
1760	Minimum Limit of Balls in a Bag	Medium	Array, Binary_Search	460	100.00

Day 4

0875	Koko Eating Bananas	Medium	Array, Binary_Search	267	93.85
1552	Magnetic Force Between Two Balls	Medium	Array, Sorting, Binary_Search	636	100.00

Day 5

0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Big_O_Time_O(n)_Space_O(n)	656	66.21
1283	Find the Smallest Divisor Given a Threshold	Medium	Array, Binary_Search	255	100.00

Day 6

1898	Maximum Number of Removable Characters	Medium	Array, String, Binary_Search	636	100.00
1870	Minimum Speed to Arrive on Time	Medium	Array, Binary_Search	628	50.00

Day 7

1482	Minimum Number of Days to Make m Bouquets	Medium	Array, Binary_Search	538	50.00
1818	Minimum Absolute Sum Difference	Medium	Array, Sorting, Binary_Search, Ordered_Set	447	100.00

Day 8

0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1)	460	66.08
0275	H-Index II	Medium	Array, Binary_Search	398	81.82

Day 9

1838	Frequency of the Most Frequent Element	Medium	Array, Sorting, Greedy, Binary_Search, Prefix_Sum, Sliding_Window	564	88.89
0540	Single Element in a Sorted Array	Medium	Array, Binary_Search	274	86.67

Day 10

0222	Count Complete Tree Nodes
1712	Ways to Split Array Into Three Subarrays	Medium	Array, Binary_Search, Two_Pointers, Prefix_Sum	486	100.00

Day 11

0826	Most Profit Assigning Work	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers	366	100.00
0436	Find Right Interval	Medium	Array, Sorting, Binary_Search	333	100.00

Day 12

0081	Search in Rotated Sorted Array II	Medium	Array, Binary_Search	170	96.30
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search	297	53.85

Day 13

0154	Find Minimum in Rotated Sorted Array II	Hard	Array, Binary_Search	275	84.00
0528	Random Pick with Weight	Medium	Math, Binary_Search, Prefix_Sum, Randomized	393	91.38

Day 14

1508	Range Sum of Sorted Subarray Sums	Medium	Array, Sorting, Binary_Search, Two_Pointers	378	66.67
1574	Shortest Subarray to be Removed to Make Array Sorted	Medium	Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack	477	50.00

Day 15

1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium	Array, Binary_Search, Matrix, Prefix_Sum	376	100.00
1498	Number of Subsequences That Satisfy the Given Sum Condition	Medium	Array, Sorting, Binary_Search, Two_Pointers	487	97.89

Day 16

0981	Time Based Key-Value Store	Medium	String, Hash_Table, Binary_Search, Design	1011	65.56
1300	Sum of Mutated Array Closest to Target	Medium	Array, Sorting, Binary_Search	217	100.00

Day 17

1802	Maximum Value at a Given Index in a Bounded Array	Medium	Greedy, Binary_Search	118	100.00
1901	Find a Peak Element II	Medium	Array, Binary_Search, Matrix, Divide_and_Conquer	726	100.00

Day 18

1146	Snapshot Array	Medium	Array, Hash_Table, Binary_Search, Design	1064	57.14
1488	Avoid Flood in The City	Medium	Array, Hash_Table, Greedy, Binary_Search, Heap_Priority_Queue	823	66.67

Day 19

1562	Find Latest Group of Size M	Medium	Array, Binary_Search, Simulation	534	100.00
1648	Sell Diminishing-Valued Colored Balls	Medium	Array, Math, Sorting, Greedy, Binary_Search, Heap_Priority_Queue	509	100.00

Day 20

1201	Ugly Number III	Medium	Math, Binary_Search, Number_Theory	136	100.00
0911	Online Election	Medium	Array, Hash_Table, Binary_Search, Design	766	83.33

Dynamic Programming I

Day 1

0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization	139	82.72
1137	N-th Tribonacci Number	Easy	Dynamic_Programming, Math, Memoization	122	69.35

Day 2

0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	124	71.98
0746	Min Cost Climbing Stairs	Easy	Array, Dynamic_Programming	171	96.76

Day 3

0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	156	92.24
0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0740	Delete and Earn	Medium	Array, Hash_Table, Dynamic_Programming	192	100.00

Day 4

0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	332	89.35
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	208	93.37

Day 5

0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	510	78.81
0918	Maximum Sum Circular Subarray	Medium	Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue	339	86.96

Day 6

0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	253	88.42
1567	Maximum Length of Subarray With Positive Product	Medium	Array, Dynamic_Programming, Greedy	468	33.33

Day 7

1014	Best Sightseeing Pair	Medium	Array, Dynamic_Programming	336	66.67
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	609	94.06
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy	197	95.10

Day 8

0309	Best Time to Buy and Sell Stock with Cooldown	Medium	Array, Dynamic_Programming	272	73.33
0714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Array, Dynamic_Programming, Greedy	417	90.91

Day 9

0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max)	197	87.17
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1)	189	99.37

Day 10

0413	Arithmetic Slices	Medium	Array, Dynamic_Programming	156	100.00
0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming	148	79.07

Day 11

0264	Ugly Number II	Medium	Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue	182	95.45
0096	Unique Binary Search Trees	Medium	Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(1)	116	92.31

Day 12

0118	Pascal’s Triangle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	277	33.22
0119	Pascal’s Triangle II	Easy	Array, Dynamic_Programming	157	97.27

Day 13

0931	Minimum Falling Path Sum	Medium	Array, Dynamic_Programming, Matrix	201	84.21
0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87

Day 14

1314	Matrix Block Sum	Medium	Array, Matrix, Prefix_Sum	235	100.00
0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71

Day 15

0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n)	118	94.65
0063	Unique Paths II	Medium	Array, Dynamic_Programming, Matrix	151	81.94

Day 16

0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	164	100.00
0221	Maximal Square	Medium	Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	614	44.00

Day 17

0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	162	99.00
0516	Longest Palindromic Subsequence	Medium	String, Dynamic_Programming	243	87.50

Day 18

0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	318	82.28
0376	Wiggle Subsequence	Medium	Array, Dynamic_Programming, Greedy	162	88.89

Day 19

0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers	156	87.74
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	307	38.36
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	182	92.16

Day 20

0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	332	50.68
0518	Coin Change II	Medium	Array, Dynamic_Programming	139	100.00

Day 21

0377	Combination Sum IV	Medium	Array, Dynamic_Programming	217	72.41
0343	Integer Break	Medium	Dynamic_Programming, Math	218	63.89
0279	Perfect Squares	Medium	Dynamic_Programming, Math, Breadth_First_Search	176	98.80

Programming Skills I

Day 1 Basic Data Type

1523	Count Odd Numbers in an Interval Range	Easy	Math	114	97.22
1491	Average Salary Excluding the Minimum and Maximum Salary	Easy	Array, Sorting	137	91.67

Day 2 Operator

0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44
1281	Subtract the Product and Sum of Digits of an Integer	Easy	Math	128	61.82

Day 3 Conditional Statements

0976	Largest Perimeter Triangle	Easy	Array, Math, Sorting, Greedy	304	33.33
1779	Find Nearest Point That Has the Same X or Y Coordinate	Easy	Array	364	100.00

Day 4 Loop

1822	Sign of the Product of an Array	Easy	Array, Math	170	92.51
1502	Can Make Arithmetic Progression From Sequence	Easy	Array, Sorting	156	94.82
0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
1790	Check if One String Swap Can Make Strings Equal	Easy	String, Hash_Table, Counting	138	100.00

Day 5 Function

0589	N-ary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Stack	233	84.02
0496	Next Greater Element I	Easy	Array, Hash_Table, Stack, Monotonic_Stack	171	100.00
1232	Check If It Is a Straight Line	Easy	Array, Math, Geometry	152	95.38

Day 6 Array

1588	Sum of All Odd Length Subarrays	Easy	Array, Math, Prefix_Sum	157	64.00
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	516	79.07
1672	Richest Customer Wealth	Easy	Array, Matrix	155	94.54

Day 7 Array

1572	Matrix Diagonal Sum	Easy	Array, Matrix	221	67.61
0566	Reshape the Matrix	Easy	Array, Matrix, Simulation	239	99.05

Day 8 String

1768	Merge Strings Alternately	Easy	String, Two_Pointers	138	93.81
1678	Goal Parser Interpretation	Easy	String	136	88.24
0389	Find the Difference	Easy	String, Hash_Table, Sorting, Bit_Manipulation	256	64.81

Day 9 String

0709	To Lower Case	Easy	String	142	98.68
1309	Decrypt String from Alphabet to Integer Mapping	Easy	String	129	95.45
0953	Verifying an Alien Dictionary	Easy	Array, String, Hash_Table	137	100.00

Day 10 Linked List and Tree

1290	Convert Binary Number in a Linked List to Integer	Easy	Math, Linked_List	138	65.79
0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H)	166	83.53
0404	Sum of Left Leaves	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	173	86.05

Day 11 Containers and Libraries

1356	Sort Integers by The Number of 1 Bits	Easy	Array, Sorting, Bit_Manipulation, Counting	236	92.31
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86
0242	Valid Anagram	Easy	String, Hash_Table, Sorting	251	87.65
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49

Day 12 Class and Object

1603	Design Parking System	Easy	Design, Simulation, Counting	376	31.83
0303	Range Sum Query - Immutable	Easy	Array, Design, Prefix_Sum	472	63.64

Programming Skills II

Day 1

0896	Monotonic Array	Easy	Array	576	90.91
0028	Find the Index of the First Occurrence in a String	Easy	Top_Interview_Questions, String, Two_Pointers, String_Matching	126	97.58

Day 2

0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	182	71.30
0459	Repeated Substring Pattern	Easy	String, String_Matching	201	100.00

Day 3

0150	Evaluate Reverse Polish Notation	Medium	Top_Interview_Questions, Array, Math, Stack	233	88.82
0066	Plus One	Easy	Top_Interview_Questions, Array, Math	148	98.75

Day 4

1367	Linked List in Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List	237	92.86
0043	Multiply Strings	Medium	String, Math, Simulation	165	96.72

Day 5

0067	Add Binary	Easy	String, Math, Bit_Manipulation, Simulation	164	90.60
0989	Add to Array-Form of Integer	Easy	Array, Math	350	70.00

Day 6

0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(n)	936	80.54
0058	Length of Last Word	Easy	String	135	93.67

Day 7

0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1)	160	90.11
1886	Determine Whether Matrix Can Be Obtained By Rotation	Easy	Array, Matrix	147	85.71

Day 8

0054	Spiral Matrix	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation	132	95.12
0973	K Closest Points to Origin	Medium	Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect	800	37.89

Day 9

1630	Arithmetic Subarrays	Medium	Array, Sorting	264	100.00
0429	N-ary Tree Level Order Traversal	Medium	Breadth_First_Search, Tree	248	75.86

Day 10

0503	Next Greater Element II	Medium	Array, Stack, Monotonic_Stack	331	92.68
0556	Next Greater Element III	Medium	String, Math, Two_Pointers	137	80.00

Day 11

1376	Time Needed to Inform All Employees	Medium	Depth_First_Search, Breadth_First_Search, Tree	915	37.62
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n)	308	96.34

Day 12

0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1)	561	54.68
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window	336	92.11

Day 13

0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71
0910	Smallest Range II	Medium	Array, Math, Sorting, Greedy	234	100.00

Day 14

0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion	395	82.26
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Big_O_Time_O(N)_Space_O(N)	274	80.58

Day 15

0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M)), AI_can_be_used_to_solve_the_task	203	96.13
0445	Add Two Numbers II	Medium	Math, Stack, Linked_List	240	82.61

Day 16

0061	Rotate List	Medium	Two_Pointers, Linked_List	160	92.22
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 17

1845	Seat Reservation Manager	Medium	Design, Heap_Priority_Queue	834	100.00
0860	Lemonade Change	Easy	Array, Greedy	413	86.96

Day 18

0155	Min Stack	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N)	331	84.88
0341	Flatten Nested List Iterator	Medium	Depth_First_Search, Tree, Stack, Design, Queue, Iterator	210	100.00

Day 19

1797	Design Authentication Manager	Medium	Hash_Table, Design	334	100.00
0707	Design Linked List	Medium	Design, Linked_List	243	100.00

Day 20

0380	Insert Delete GetRandom O(1)	Medium	Array, Hash_Table, Math, Design, Randomized	1326	68.23
0622	Design Circular Queue	Medium	Array, Design, Linked_List, Queue	234	92.68
0729	My Calendar I	Medium	Binary_Search, Design, Ordered_Set, Segment_Tree	378	69.70

Graph Theory I

Day 1 Matrix Related Problems

0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	230	97.76
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	252	95.41

Day 2 Matrix Related Problems

0695	Max Area of Island	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	181	93.83
1254	Number of Closed Islands	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	177	89.47

Day 3 Matrix Related Problems

1020	Number of Enclaves	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	283	90.70
1905	Count Sub Islands	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	866	100.00

Day 4 Matrix Related Problems

1162	As Far from Land as Possible	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	362	81.25
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	319	100.00

Day 5 Matrix Related Problems

1091	Shortest Path in Binary Matrix	Medium	Array, Breadth_First_Search, Matrix	305	98.28
0542	01 Matrix	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	441	94.06

Day 6 Matrix Related Problems

0934	Shortest Bridge	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	301	80.95
1926	Nearest Exit from Entrance in Maze	Medium	Array, Breadth_First_Search, Matrix	351	94.44

Day 7 Standard Traversal

0797	All Paths From Source to Target	Medium	Depth_First_Search, Breadth_First_Search, Graph, Backtracking	232	100.00
0841	Keys and Rooms	Medium	Depth_First_Search, Breadth_First_Search, Graph	189	69.23

Day 8 Standard Traversal

0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	229	79.73
1319	Number of Operations to Make Network Connected	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	379	83.33

Day 9 Standard Traversal

1376	Time Needed to Inform All Employees	Medium	Depth_First_Search, Breadth_First_Search, Tree	915	37.62
0802	Find Eventual Safe States	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	511	100.00

Day 10 Standard Traversal

1129	Shortest Path with Alternating Colors	Medium	Breadth_First_Search, Graph	208	80.00
1466	Reorder Routes to Make All Paths Lead to the City Zero	Medium	Depth_First_Search, Breadth_First_Search, Graph	718	100.00
0847	Shortest Path Visiting All Nodes	Hard	Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask	164	100.00

Day 11 Breadth First Search

1306	Jump Game III	Medium	Array, Depth_First_Search, Breadth_First_Search	291	100.00
1654	Minimum Jumps to Reach Home	Medium	Array, Dynamic_Programming, Breadth_First_Search	192	100.00
0365	Water and Jug Problem	Medium	Math, Depth_First_Search, Breadth_First_Search	130	100.00

Day 12 Breadth First Search

0433	Minimum Genetic Mutation	Medium	String, Hash_Table, Breadth_First_Search	204	82.08
0752	Open the Lock	Medium	Array, String, Hash_Table, Breadth_First_Search	310	100.00
0127	Word Ladder	Hard	Top_Interview_Questions, String, Hash_Table, Breadth_First_Search	396	98.68

Day 13 Graph Theory

0997	Find the Town Judge	Easy	Array, Hash_Table, Graph	475	58.62
1557	Minimum Number of Vertices to Reach All Nodes	Medium	Graph	792	99.29

Day 14 Graph Theory

1615	Maximal Network Rank	Medium	Graph	282	100.00
0886	Possible Bipartition	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	397	100.00
0785	Is Graph Bipartite?	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	215	82.35

SQL I

Day 1 Select

0595	Big Countries	Easy	Database	417	56.09
1757	Recyclable and Low Fat Products	Easy	Database	1237	34.20
0584	Find Customer Referee	Easy	Database	779	43.48
0183	Customers Who Never Order	Easy	Database	712	33.67

Day 2 Select and Order

1873	Calculate Special Bonus	Easy	Database	1321	33.12
0627	Swap Salary	Easy	Database	400	51.04
0196	Delete Duplicate Emails	Easy	Database	593	94.17

Day 3 String Processing Functions

1667	Fix Names in a Table	Easy	Database	1196	61.40
1484	Group Sold Products By The Date	Easy	LeetCode_Curated_SQL_70, Database	899	40.76
1527	Patients With a Condition	Easy	Database	708	48.23

Day 4 Union and Select

1965	Employees With Missing Information	Easy	Database	949	88.66
1795	Rearrange Products Table	Easy	Database	1027	67.57
0608	Tree Node	Medium	LeetCode_Curated_SQL_70, Database	794	48.38
0176	Second Highest Salary	Medium	Database	219	92.54

Day 5 Union

0175	Combine Two Tables	Easy	Database	473	54.97
1581	Customer Who Visited but Did Not Make Any Transactions	Easy	Database	2771	54.68
1148	Article Views I	Easy	LeetCode_Curated_SQL_70, Database	806	54.41

Day 6 Union

0197	Rising Temperature	Easy	Database	394	94.15
0607	Sales Person	Easy	LeetCode_Curated_SQL_70, Database	2142	44.56

Day 7 Function

1141	User Activity for the Past 30 Days I	Easy	LeetCode_Curated_SQL_70, Database	790	87.11
1693	Daily Leads and Partners	Easy	Database	1115	52.84
1729	Find Followers Count	Easy	Database	1228	38.04

Day 8 Function

0586	Customer Placing the Largest Number of Orders	Easy	LeetCode_Curated_SQL_70, Database	768	44.85
0511	Game Play Analysis I	Easy	LeetCode_Curated_SQL_70, Database	790	45.04
1890	The Latest Login in 2020	Easy	Database	1280	43.62
1741	Find Total Time Spent by Each Employee	Easy	Database	1101	51.40

Day 9 Control of Flow

1393	Capital Gain/Loss	Medium	LeetCode_Curated_SQL_70, Database	990	47.36
1407	Top Travellers	Easy	LeetCode_Curated_SQL_70, Database	1394	98.43
1158	Market Analysis I	Medium	Database	2470	44.76

Day 10 Where

0182	Duplicate Emails	Easy	Database	396	68.40
1050	Actors and Directors Who Cooperated At Least Three Times	Easy	LeetCode_Curated_SQL_70, Database	629	81.02
1587	Bank Account Summary II	Easy	Database	1582	52.96
1084	Sales Analysis III	Easy	LeetCode_Curated_SQL_70, Database	1881	79.36

Level 1

Day 1 Prefix Sum

1480	Running Sum of 1d Array	Easy	Array, Prefix_Sum	161	84.80
0724	Find Pivot Index	Easy	Array, Prefix_Sum	255	88.92

Day 2 String

0205	Isomorphic Strings	Easy	String, Hash_Table	278	79.96
0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers	156	87.74

Day 3 Linked List

0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	157	92.24
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	279	45.78

Day 4 Linked List

0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1)	192	63.39

Day 5 Greedy

0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	609	94.06
0409	Longest Palindrome	Easy	String, Hash_Table, Greedy	259	60.71

Day 6 Tree

0589	N-ary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Stack	233	84.02
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N)	198	95.14

Day 7 Binary Search

0704	Binary Search	Easy	Top_100_Liked_Questions, Array, Binary_Search	261	77.91
0278	First Bad Version	Easy	Binary_Search, Interactive	349	76.86

Day 8 Binary Search Tree

0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N))	190	61.62
0235	Lowest Common Ancestor of a Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	404	75.59

Day 9 Graph/BFS/DFS

0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	230	97.76
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	252	95.41

Day 10 Dynamic Programming

0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization	139	82.72
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	124	71.98

Day 11 Dynamic Programming

0746	Min Cost Climbing Stairs	Easy	Array, Dynamic_Programming	171	96.76
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n)	118	94.65

Day 12 Sliding Window/Two Pointer

0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1)	561	54.68
0424	Longest Repeating Character Replacement	Medium	String, Hash_Table, Sliding_Window	288	84.38

Day 13 Hashmap

0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task	202	91.18
0299	Bulls and Cows	Medium	String, Hash_Table, Counting	254	84.82

Day 14 Stack

0844	Backspace String Compare	Easy	String, Two_Pointers, Stack, Simulation	126	98.31
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n)	224	64.86

Day 15 Heap

1046	Last Stone Weight	Easy	Array, Heap_Priority_Queue	123	100.00
0692	Top K Frequent Words	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort	239	81.10

Level 2

Day 1 Implementation/Simulation

0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers	261	45.08
0054	Spiral Matrix	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation	132	95.12
1706	Where Will the Ball Fall	Medium	Array, Dynamic_Programming, Depth_First_Search, Matrix, Simulation	270	67.86

Day 2 String

0014	Longest Common Prefix	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String	154	89.70
0043	Multiply Strings	Medium	String, Math, Simulation	165	96.72

Day 3 Linked List

0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L)	144	96.28
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	641	79.53

Day 4 Linked List

0328	Odd Even Linked List	Medium	Linked_List	216	86.96
0148	Sort List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(log(N))_Space_O(log(N))	820	61.70

Day 5 Greedy

2131	Longest Palindrome by Concatenating Two Letter Words	Medium	Array, String, Hash_Table, Greedy, Counting	607	90.00
0621	Task Scheduler	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	266	98.36

Day 6 Tree

0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	233	54.90
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	182	71.30

Day 7 Tree

0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	307	43.93
0437	Path Sum III	Medium	Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	403	54.12

Day 8 Binary Search

0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	159	74.46
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	151	93.77

Day 9 Binary Search Tree

0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	167	80.29
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n)	393	33.33
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 10 Graph/BFS/DFS

0994	Rotting Oranges	Medium	Top_100_Liked_Questions, Array, Breadth_First_Search, Matrix	164	82.95
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	319	100.00

Day 11 Graph/BFS/DFS

0210	Course Schedule II	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	266	96.32
0815	Bus Routes	Hard	Array, Hash_Table, Breadth_First_Search	429	100.00

Day 12 Dynamic Programming

0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	156	92.24
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	332	50.68

Day 13 Dynamic Programming

0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums)	204	98.82
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	253	88.42

Day 14 Sliding Window/Two Pointer

0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task	201	87.28
0016	3Sum Closest	Medium	Array, Sorting, Two_Pointers	163	100.00
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(s.length())_Space_O(1)	191	96.38

Day 15 Tree

0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	134	86.63
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N))	153	82.35
0199	Binary Tree Right Side View	Medium	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	194	92.89

Day 16 Design

0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86
0155	Min Stack	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N)	331	84.88
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)	689	61.00

Day 17 Interval

0057	Insert Interval	Medium	Array	249	75.63
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	334	80.67

Day 18 Stack

0735	Asteroid Collision	Medium	Array, Stack	243	100.00
0227	Basic Calculator II	Medium	String, Math, Stack	383	62.50

Day 19 Union Find

0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	229	79.73
0947	Most Stones Removed with Same Row or Column	Medium	Depth_First_Search, Graph, Union_Find	200	100.00

Day 20 Brute Force/Backtracking

0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n)	226	88.89
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!)	188	99.00

Udemy

Udemy Integers

0412	Fizz Buzz	Easy	String, Math, Simulation	307	71.81
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1)	344	83.63
0007	Reverse Integer	Medium	Top_Interview_Questions, Math	149	77.89
0009	Palindrome Number	Easy	Math	217	95.34
0172	Factorial Trailing Zeroes	Medium	Top_Interview_Questions, Math	220	67.65
0050	Pow(x, n)	Medium	Top_Interview_Questions, Math, Recursion	172	38.68

Udemy Strings

0344	Reverse String	Easy	String, Two_Pointers, Recursion	445	69.75
0014	Longest Common Prefix	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String	154	89.70
0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash	319	79.03
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task	201	87.28
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)	137	88.76
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	162	99.00
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n)	224	64.86
0242	Valid Anagram	Easy	String, Hash_Table, Sorting	251	87.65
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n)	308	96.34
0151	Reverse Words in a String	Medium	String, Two_Pointers	206	98.90
0273	Integer to English Words	Hard	String, Math, Recursion	273	82.93

Udemy Binary Search

0704	Binary Search	Easy	Top_100_Liked_Questions, Array, Binary_Search	261	77.91
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	151	93.77
0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N)	262	60.96

Udemy Arrays

0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	609	94.06
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	516	79.07
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task	202	91.18
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49
0058	Length of Last Word	Easy	String	135	93.67
0605	Can Place Flowers	Easy	Array, Greedy	209	85.71
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy	197	95.10
0080	Remove Duplicates from Sorted Array II	Medium	Array, Two_Pointers	192	80.67
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	483	86.95
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	332	89.35
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	164	64.43
0066	Plus One	Easy	Top_Interview_Questions, Array, Math	148	98.75
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n)	669	48.96
1291	Sequential Digits	Medium	Enumeration	114	100.00
0448	Find All Numbers Disappeared in an Array	Easy	Array, Hash_Table	394	100.00
0442	Find All Duplicates in an Array	Medium	Array, Hash_Table	480	73.81
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)	357	97.17
0697	Degree of an Array	Easy	Array, Hash_Table	289	84.62
0532	K-diff Pairs in an Array	Medium	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	230	84.62
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window	336	92.11
1007	Minimum Domino Rotations For Equal Row	Medium	Array, Greedy	421	50.00
1306	Jump Game III	Medium	Array, Depth_First_Search, Breadth_First_Search	291	100.00
0456	132 Pattern	Medium	Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack	434	100.00
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Big_O_Time_O(n*k)_Space_O(n+k)	1059	86.14

Udemy Two Pointers

0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers	156	87.74
0125	Valid Palindrome	Easy	Top_Interview_Questions, String, Two_Pointers	353	52.06
0977	Squares of a Sorted Array	Easy	Array, Sorting, Two_Pointers	271	77.17
0026	Remove Duplicates from Sorted Array	Easy	Top_Interview_Questions, Array, Two_Pointers	249	67.38
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1)	189	99.37
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	493	93.45

Udemy Famous Algorithm

0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	510	78.81
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	460	51.25

Udemy Sorting Algorithms

0912	Sort an Array	Medium	Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort	606	98.48

Udemy 2D Arrays/Matrix

0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum	1373	85.71
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	159	74.46
0054	Spiral Matrix	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation	132	95.12
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1)	160	90.11
1572	Matrix Diagonal Sum	Easy	Array, Matrix	221	67.61
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m*n)_Space_O(1)	248	97.33
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	334	80.67

Udemy Linked List

0114	Flatten Binary Tree to Linked List	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Big_O_Time_O(N)_Space_O(N)	191	93.10
0445	Add Two Numbers II	Medium	Math, Stack, Linked_List	240	82.61
0328	Odd Even Linked List	Medium	Linked_List	216	86.96
0061	Rotate List	Medium	Two_Pointers, Linked_List	160	92.22
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	149	44.20
0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List	136	76.52
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1)	192	63.39
0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1)	223	91.85
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	279	45.78
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	157	92.24
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1)	262	83.50
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	641	79.53
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Big_O_Time_O(N)_Space_O(N)	274	80.58
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k)	189	67.03
0146	LRU Cache	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Big_O_Time_O(1)_Space_O(capacity)	1116	97.93
0707	Design Linked List	Medium	Design, Linked_List	243	100.00

Udemy Tree Stack Queue

0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	277	37.90
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n)	152	66.67
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	211	80.00
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N)	198	95.14
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	176	71.62
0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	167	80.29
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree	145	100.00
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	307	43.93
0938	Range Sum of BST	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	356	55.36
0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	134	86.63
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	233	54.90
0111	Minimum Depth of Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	525	90.51
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H)	166	83.53
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	182	71.30
0701	Insert into a Binary Search Tree	Medium	Tree, Binary_Tree, Binary_Search_Tree	311	79.03
0297	Serialize and Deserialize Binary Tree	Hard	String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	475	78.85
0124	Binary Tree Maximum Path Sum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N)	331	74.42
0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N))	190	61.62
0337	House Robber III	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	282	84.62
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	386	45.21
0968	Binary Tree Cameras	Hard	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	176	100.00

Udemy Trie and Heap

0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)	689	61.00
0745	Prefix and Suffix Search	Hard	String, Design, Trie	1638	100.00

Udemy Graph

0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N)	252	95.41
0133	Clone Graph	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Graph	351	60.91
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	319	100.00

Udemy Dynamic Programming

0120	Triangle	Medium	Array, Dynamic_Programming	194	97.87
0118	Pascal’s Triangle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	277	33.22
0119	Pascal’s Triangle II	Easy	Array, Dynamic_Programming	157	97.27
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max)	197	87.17
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	253	88.42
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	156	92.24
0213	House Robber II	Medium	Array, Dynamic_Programming	257	59.62
0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization	139	82.72
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n)	124	71.98
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	164	100.00
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n)	318	82.28
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	307	38.36
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	182	92.16
0044	Wildcard Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion	220	84.85
0010	Regular Expression Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m*n)_Space_O(m*n)	171	85.26

Udemy Backtracking/Recursion

0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n)	161	85.45
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n)	226	88.89
0216	Combination Sum III	Medium	Array, Backtracking	175	90.91
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n)	171	94.92
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n)	155	95.24
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!)	188	99.00

Udemy Bit Manipulation

0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation	237	68.44
0389	Find the Difference	Easy	String, Hash_Table, Sorting, Bit_Manipulation	256	64.81
0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer	198	81.82
0461	Hamming Distance	Easy	Bit_Manipulation	150	96.15
1009	Complement of Base 10 Integer	Easy	Bit_Manipulation	126	72.73
0338	Counting Bits	Easy	Dynamic_Programming, Bit_Manipulation, Big_O_Time_O(num)_Space_O(num)	186	99.26
0371	Sum of Two Integers	Medium	Math, Bit_Manipulation	129	95.45
0029	Divide Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation	144	82.50

Udemy Design

0155	Min Stack	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N)	331	84.88

Data Structure I

Day 1 Array

0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting	719	73.49
0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	510	78.81

Day 2 Array

0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task	202	91.18
0088	Merge Sorted Array	Easy	Top_Interview_Questions, Array, Sorting, Two_Pointers	170	69.74

Day 3 Array

0350	Intersection of Two Arrays II	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	321	73.37
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	609	94.06

Day 4 Array

0566	Reshape the Matrix	Easy	Array, Matrix, Simulation	239	99.05
0118	Pascal’s Triangle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming	277	33.22

Day 5 Array

0036	Valid Sudoku	Medium	Top_Interview_Questions, Array, Hash_Table, Matrix	181	95.15
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	159	74.46

Day 6 String

0387	First Unique Character in a String	Easy	String, Hash_Table, Counting, Queue	369	82.68
0383	Ransom Note	Easy	String, Hash_Table, Counting	333	79.58
0242	Valid Anagram	Easy	String, Hash_Table, Sorting	251	87.65

Day 7 Linked List

0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1)	223	91.85
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n)	157	92.24
0203	Remove Linked List Elements	Easy	Linked_List, Recursion	233	91.22

Day 8 Linked List

0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1)	279	45.78
0083	Remove Duplicates from Sorted List	Easy	Linked_List	173	82.42

Day 9 Stack Queue

0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)	137	88.76
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue	258	70.86

Day 10 Tree

0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	277	37.90
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n)	152	66.67
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack	211	80.00

Day 11 Tree

0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N)	198	95.14
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H)	166	83.53
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N))	153	82.35

Day 12 Tree

0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	233	54.90
0112	Path Sum	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	322	36.41

Day 13 Tree

0700	Search in a Binary Search Tree	Easy	Tree, Binary_Tree, Binary_Search_Tree	251	88.31
0701	Insert into a Binary Search Tree	Medium	Tree, Binary_Tree, Binary_Search_Tree	311	79.03

Day 14 Tree

0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N))	190	61.62
0653	Two Sum IV - Input is a BST	Easy	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree	231	96.08
0235	Lowest Common Ancestor of a Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	404	75.59

Data Structure II

Day 1 Array

0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1)	344	83.63
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1)	460	51.25
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	493	93.45

Day 2 Array

0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	164	64.43
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	334	80.67
0706	Design HashMap	Easy	Array, Hash_Table, Design, Linked_List, Hash_Function	405	92.11

Day 3 Array

0119	Pascal’s Triangle II	Easy	Array, Dynamic_Programming	157	97.27
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1)	160	90.11
0059	Spiral Matrix II	Medium	Array, Matrix, Simulation	153	41.70

Day 4 Array

0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1)	460	66.08
0435	Non-overlapping Intervals	Medium	Array, Dynamic_Programming, Sorting, Greedy	1040	85.07

Day 5 Array

0334	Increasing Triplet Subsequence	Medium	Array, Greedy	672	60.61
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n)	669	48.96
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Big_O_Time_O(n)_Space_O(n)	692	53.27

Day 6 String

0415	Add Strings	Easy	String, Math, Simulation	296	76.00
0409	Longest Palindrome	Easy	String, Hash_Table, Greedy	259	60.71

Day 7 String

0290	Word Pattern	Easy	String, Hash_Table	177	89.55
0763	Partition Labels	Medium	String, Hash_Table, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	235	84.75

Day 8 String

0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n)	308	96.34
0043	Multiply Strings	Medium	String, Math, Simulation	165	96.72

Day 9 String

0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash	319	79.03
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	162	99.00

Day 10 Linked List

0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M)), AI_can_be_used_to_solve_the_task	203	96.13
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1)	192	63.39

Day 11 Linked List

0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1)	262	83.50
0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List	166	89.47

Day 12 Linked List

0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	149	44.20
0707	Design Linked List	Medium	Design, Linked_List	243	100.00

Day 13 Linked List

0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k)	189	67.03
0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion	395	82.26

Day 14 Stack Queue

0155	Min Stack	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N)	331	84.88
1249	Minimum Remove to Make Valid Parentheses	Medium	String, Stack	218	100.00
1823	Find the Winner of the Circular Game	Medium	Array, Math, Simulation, Recursion, Queue	119	87.50

Day 15 Tree

0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	167	80.29
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Big_O_Time_O(N)_Space_O(N)	183	95.45
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree	176	71.62

Day 16 Tree

0199	Binary Tree Right Side View	Medium	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	194	92.89
0113	Path Sum II	Medium	Depth_First_Search, Tree, Binary_Tree, Backtracking	364	78.67
0450	Delete Node in a BST	Medium	Tree, Binary_Tree, Binary_Search_Tree	257	84.62

Day 17 Tree

0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n)	393	33.33
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator	563	46.91

Day 18 Tree

0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	386	45.21
0297	Serialize and Deserialize Binary Tree	Hard	String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	475	78.85

Day 19 Graph

0997	Find the Town Judge	Easy	Array, Hash_Table, Graph	475	58.62
1557	Minimum Number of Vertices to Reach All Nodes	Medium	Graph	792	99.29
0841	Keys and Rooms	Medium	Depth_First_Search, Breadth_First_Search, Graph	189	69.23

Day 20 Heap Priority Queue

0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Big_O_Time_O(n*log(n))_Space_O(log(n))	839	34.43
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Big_O_Time_O(n*log(n))_Space_O(k)	268	99.74

Day 21 Heap Priority Queue

0451	Sort Characters By Frequency	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort	288	81.72
0973	K Closest Points to Origin	Medium	Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect	800	37.89

Algorithms

#	Title	Difficulty	Tag	Time, ms	Time, %
3373	Maximize the Number of Target Nodes After Connecting Trees II	Hard	Depth_First_Search, Breadth_First_Search, Tree	26	98.75
3372	Maximize the Number of Target Nodes After Connecting Trees I	Medium	Depth_First_Search, Breadth_First_Search, Tree	50	99.49
3371	Identify the Largest Outlier in an Array	Medium	Array, Hash_Table, Counting, Enumeration	5	100.00
3370	Smallest Number With All Set Bits	Easy	Math, Bit_Manipulation	0	100.00
3367	Maximize Sum of Weights after Edge Removals	Hard	Dynamic_Programming, Depth_First_Search, Tree	113	100.00
3366	Minimum Array Sum	Medium	Array, Dynamic_Programming	15	100.00
3365	Rearrange K Substrings to Form Target String	Medium	String, Hash_Table, Sorting	457	100.00
3364	Minimum Positive Sum Subarray	Easy	Array, Prefix_Sum, Sliding_Window	3	98.15
3363	Find the Maximum Number of Fruits Collected	Hard	Array, Dynamic_Programming, Matrix	39	88.89
3362	Zero Array Transformation III	Medium	Array, Sorting, Greedy, Heap_Priority_Queue, Prefix_Sum	195	81.82
3361	Shift Distance Between Two Strings	Medium	Array, String, Prefix_Sum	350	82.50
3360	Stone Removal Game	Easy	Math, Simulation	0	100.00
3357	Minimize the Maximum Adjacent Element Difference	Hard	Array, Greedy, Binary_Search	13	100.00
3356	Zero Array Transformation II	Medium	Array, Binary_Search, Prefix_Sum	5	100.00
3355	Zero Array Transformation I	Medium	Array, Prefix_Sum	6	36.84
3354	Make Array Elements Equal to Zero	Easy	Array, Simulation, Prefix_Sum	153	96.67
3352	Count K-Reducible Numbers Less Than N	Hard	String, Dynamic_Programming, Math, Combinatorics	170	100.00
3351	Sum of Good Subsequences	Hard	Array, Hash_Table, Dynamic_Programming	16	100.00
3350	Adjacent Increasing Subarrays Detection II	Medium	Array, Binary_Search	947	48.57
3349	Adjacent Increasing Subarrays Detection I	Easy	Array	179	97.92
3348	Smallest Divisible Digit Product II	Hard	String, Math, Greedy, Backtracking, Number_Theory	46	100.00
3347	Maximum Frequency of an Element After Performing Operations II	Hard	Array, Sorting, Binary_Search, Prefix_Sum, Sliding_Window	48	100.00
3346	Maximum Frequency of an Element After Performing Operations I	Medium	Array, Sorting, Binary_Search, Prefix_Sum, Sliding_Window	12	100.00
3345	Smallest Divisible Digit Product I	Easy	Math, Enumeration	1	100.00
3343	Count Number of Balanced Permutations	Hard	String, Dynamic_Programming, Math, Combinatorics	66	100.00
3342	Find Minimum Time to Reach Last Room II	Medium	Array, Matrix, Heap_Priority_Queue, Graph, Shortest_Path	122	100.00
3341	Find Minimum Time to Reach Last Room I	Medium	Array, Matrix, Heap_Priority_Queue, Graph, Shortest_Path	257	42.10
3340	Check Balanced String	Easy	String	1	100.00
3337	Total Characters in String After Transformations II	Hard	String, Hash_Table, Dynamic_Programming, Math, Counting	320	100.00
3336	Find the Number of Subsequences With Equal GCD	Hard	Array, Dynamic_Programming, Math, Number_Theory	324	100.00
3335	Total Characters in String After Transformations I	Medium	String, Hash_Table, Dynamic_Programming, Math, Counting	58	80.00
3334	Find the Maximum Factor Score of Array	Medium	Array, Math, Number_Theory	4	95.83
3333	Find the Original Typed String II	Hard	String, Dynamic_Programming, Prefix_Sum	490	100.00
3332	Maximum Points Tourist Can Earn	Medium	Array, Dynamic_Programming, Matrix	216	100.00
3331	Find Subtree Sizes After Changes	Medium	Array, String, Hash_Table, Depth_First_Search, Tree	139	95.24
3330	Find the Original Typed String I	Easy	String	142	88.24
3327	Check if DFS Strings Are Palindromes	Hard	Array, String, Hash_Table, Depth_First_Search, Tree, Hash_Function	165	100.00
3326	Minimum Division Operations to Make Array Non Decreasing	Medium	Array, Math, Greedy, Number_Theory	24	94.12
3325	Count Substrings With K-Frequency Characters I	Medium	String, Hash_Table, Sliding_Window	3	88.00
3324	Find the Sequence of Strings Appeared on the Screen	Medium	String, Simulation	8	100.00
3321	Find X-Sum of All K-Long Subarrays II	Hard	Array, Hash_Table, Heap_Priority_Queue, Sliding_Window	1660	100.00
3320	Count The Number of Winning Sequences	Hard	String, Dynamic_Programming	335	100.00
3319	K-th Largest Perfect Subtree Size in Binary Tree	Medium	Sorting, Depth_First_Search, Tree, Binary_Tree	332	45.45
3318	Find X-Sum of All K-Long Subarrays I	Easy	Array, Hash_Table, Heap_Priority_Queue, Sliding_Window	262	86.21
3317	Find the Number of Possible Ways for an Event	Hard	Dynamic_Programming, Math, Combinatorics	166	100.00
3316	Find Maximum Removals From Source String	Medium	Array, String, Hash_Table, Dynamic_Programming, Two_Pointers	220	100.00
3315	Construct the Minimum Bitwise Array II	Medium	Array, Bit_Manipulation	231	77.27
3314	Construct the Minimum Bitwise Array I	Easy	Array, Bit_Manipulation	226	57.14
3312	Sorted GCD Pair Queries	Hard	Array, Hash_Table, Math, Binary_Search, Prefix_Sum, Counting, Number_Theory, Combinatorics	734	100.00
3311	Construct 2D Grid Matching Graph Layout	Hard	Array, Hash_Table, Matrix, Graph	1423	100.00
3310	Remove Methods From Project	Medium	Depth_First_Search, Breadth_First_Search, Graph	1465	100.00
3309	Maximum Possible Number by Binary Concatenation	Medium	Array, Bit_Manipulation, Enumeration	182	73.47
3307	Find the K-th Character in String Game II	Hard	Math, Bit_Manipulation, Recursion	189	50.00
3306	Count of Substrings Containing Every Vowel and K Consonants II	Medium	String, Hash_Table, Sliding_Window	651	100.00
3305	Count of Substrings Containing Every Vowel and K Consonants I	Medium	String, Hash_Table, Sliding_Window	153	100.00
3304	Find the K-th Character in String Game I	Easy	Math, Bit_Manipulation, Simulation, Recursion	140	96.43
3303	Find the Occurrence of First Almost Equal Substring	Hard	String, String_Matching	364	100.00
3302	Find the Lexicographically Smallest Valid Sequence	Medium	String, Dynamic_Programming, Greedy, Two_Pointers	705	100.00
3301	Maximize the Total Height of Unique Towers	Medium	Array, Sorting, Greedy	761	87.50
3300	Minimum Element After Replacement With Digit Sum	Easy	Array, Math	153	100.00
3298	Count Substrings That Can Be Rearranged to Contain a String II	Hard	String, Hash_Table, Sliding_Window	433	78.57
3297	Count Substrings That Can Be Rearranged to Contain a String I	Medium	String, Hash_Table, Sliding_Window	215	93.33
3296	Minimum Number of Seconds to Make Mountain Height Zero	Medium	Array, Math, Binary_Search	228	87.50
3295	Report Spam Message	Medium	Array, String, Hash_Table	782	74.19
3292	Minimum Number of Valid Strings to Form Target II	Hard	Array, String, Dynamic_Programming, Binary_Search, Segment_Tree, Hash_Function, String_Matching, Rolling_Hash	674	50.00
3291	Minimum Number of Valid Strings to Form Target I	Medium	Array, String, Dynamic_Programming, Binary_Search, Trie, Segment_Tree, Hash_Function, String_Matching, Rolling_Hash	566	70.00
3290	Maximum Multiplication Score	Medium	Array, Dynamic_Programming	749	66.67
3289	The Two Sneaky Numbers of Digitville	Easy	Array, Hash_Table, Math	223	68.97
3288	Length of the Longest Increasing Path	Hard	Array, Sorting, Binary_Search	984	83.33
3287	Find the Maximum Sequence Value of Array	Hard	Array, Dynamic_Programming, Bit_Manipulation	2893	33.33
3286	Find a Safe Walk Through a Grid	Medium	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path	357	48.28
3285	Find Indices of Stable Mountains	Easy	Array	195	92.68
3283	Maximum Number of Moves to Kill All Pawns	Hard	Array, Math, Breadth_First_Search, Bit_Manipulation, Bitmask, Game_Theory	638	100.00
3282	Reach End of Array With Max Score	Medium	Array, Greedy	789	90.91
3281	Maximize Score of Numbers in Ranges	Medium	Array, Sorting, Greedy, Binary_Search	710	88.24
3280	Convert Date to Binary	Easy	String, Math	174	79.31
3277	Maximum XOR Score Subarray Queries	Hard	Array, Dynamic_Programming	1269	100.00
3276	Select Cells in Grid With Maximum Score	Hard	Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask	213	92.31
3275	K-th Nearest Obstacle Queries	Medium	Array, Heap_Priority_Queue	1277	100.00
3274	Check if Two Chessboard Squares Have the Same Color	Easy	String, Math	164	38.64
3273	Minimum Amount of Damage Dealt to Bob	Hard	Array, Sorting, Greedy	793	90.00
3272	Find the Count of Good Integers	Hard	Hash_Table, Math, Enumeration, Combinatorics	452	80.00
3271	Hash Divided String	Medium	String, Simulation	178	100.00
3270	Find the Key of the Numbers	Easy	Math	122	97.83
3267	Count Almost Equal Pairs II	Hard	Array, Hash_Table, Sorting, Counting, Enumeration	814	100.00
3266	Final Array State After K Multiplication Operations II	Hard	Array, Heap_Priority_Queue, Simulation	500	100.00
3265	Count Almost Equal Pairs I	Medium	Array, Hash_Table, Sorting, Counting, Enumeration	184	100.00
3264	Final Array State After K Multiplication Operations I	Easy	Array, Math, Heap_Priority_Queue, Simulation	237	55.55
3261	Count Substrings That Satisfy K-Constraint II	Hard	Array, String, Binary_Search, Prefix_Sum, Sliding_Window	1005	100.00
3260	Find the Largest Palindrome Divisible by K	Hard	String, Dynamic_Programming, Math, Greedy, Number_Theory	211	100.00
3259	Maximum Energy Boost From Two Drinks	Medium	Array, Dynamic_Programming	811	96.88
3258	Count Substrings That Satisfy K-Constraint I	Easy	String, Sliding_Window	155	92.86
3257	Maximum Value Sum by Placing Three Rooks II	Hard	Array, Dynamic_Programming, Matrix, Enumeration	770	100.00
3256	Maximum Value Sum by Placing Three Rooks I	Hard	Array, Dynamic_Programming, Matrix, Enumeration	279	100.00
3255	Find the Power of K-Size Subarrays II	Medium	Array, Sliding_Window	892	89.36
3254	Find the Power of K-Size Subarrays I	Medium	Array, Sliding_Window	245	92.59
3251	Find the Count of Monotonic Pairs II	Hard	Array, Dynamic_Programming, Math, Prefix_Sum, Combinatorics	291	100.00
3250	Find the Count of Monotonic Pairs I	Hard	Array, Dynamic_Programming, Math, Prefix_Sum, Combinatorics	241	100.00
3249	Count the Number of Good Nodes	Medium	Depth_First_Search, Tree	1190	100.00
3248	Snake in Matrix	Easy	Array, String, Simulation	174	90.91
3245	Alternating Groups III	Hard	Array, Binary_Indexed_Tree	1072	100.00
3244	Shortest Distance After Road Addition Queries II	Hard	Array, Greedy, Graph, Ordered_Set	794	92.31
3243	Shortest Distance After Road Addition Queries I	Medium	Array, Breadth_First_Search, Graph	313	97.06
3242	Design Neighbor Sum Service	Easy	Array, Hash_Table, Matrix, Design, Simulation	333	75.00
3241	Time Taken to Mark All Nodes	Hard	Dynamic_Programming, Depth_First_Search, Tree, Graph	1228	100.00
3240	Minimum Number of Flips to Make Binary Grid Palindromic II	Medium	Array, Matrix, Two_Pointers	805	100.00
3239	Minimum Number of Flips to Make Binary Grid Palindromic I	Medium	Array, Matrix, Two_Pointers	856	87.50
3238	Find the Number of Winning Players	Easy	Array, Hash_Table, Counting	207	90.38
3235	Check if the Rectangle Corner Is Reachable	Hard	Array, Math, Depth_First_Search, Breadth_First_Search, Union_Find, Geometry	612	66.67
3234	Count the Number of Substrings With Dominant Ones	Medium	String, Sliding_Window, Enumeration	356	100.00
3233	Find the Count of Numbers Which Are Not Special	Medium	Array, Math, Number_Theory	215	76.19
3232	Find if Digit Game Can Be Won	Easy	Array, Math	194	36.00
3229	Minimum Operations to Make Array Equal to Target	Hard	Array, Dynamic_Programming, Greedy, Stack, Monotonic_Stack	636	57.14
3228	Maximum Number of Operations to Move Ones to the End	Medium	String, Greedy, Counting	232	44.00
3227	Vowels Game in a String	Medium	String, Math, Game_Theory, Brainteaser	234	90.32
3226	Number of Bit Changes to Make Two Integers Equal	Easy	Bit_Manipulation	136	61.90
3225	Maximum Score From Grid Operations	Hard	Array, Dynamic_Programming, Matrix, Prefix_Sum	371	100.00
3224	Minimum Array Changes to Make Differences Equal	Medium	Array, Hash_Table, Prefix_Sum	665	84.62
3223	Minimum Length of String After Operations	Medium	String, Hash_Table, Counting	316	60.00
3222	Find the Winning Player in Coin Game	Easy	Math, Simulation, Game_Theory	140	86.44
3220	Odd and Even Transactions	Medium	Database	248	85.85
3219	Minimum Cost for Cutting Cake II	Hard	Array, Sorting, Greedy	776	100.00
3218	Minimum Cost for Cutting Cake I	Medium	Array, Dynamic_Programming, Sorting, Greedy	175	78.05
3217	Delete Nodes From Linked List Present in Array	Medium	Array, Hash_Table, Linked_List	872	98.31
3216	Lexicographically Smallest String After a Swap	Easy	String, Greedy	157	95.16
3213	Construct String with Minimum Cost	Hard	Array, String, Dynamic_Programming, Suffix_Array	1176	46.67
3212	Count Submatrices With Equal Frequency of X and Y	Medium	Array, Matrix, Prefix_Sum	1009	78.95
3211	Generate Binary Strings Without Adjacent Zeros	Medium	String, Bit_Manipulation, Recursion	237	38.18
3210	Find the Encrypted String	Easy	String	170	62.69
3209	Number of Subarrays With AND Value of K	Hard	Array, Binary_Search, Bit_Manipulation, Segment_Tree	530	100.00
3208	Alternating Groups II	Medium	Array, Sliding_Window	449	97.62
3207	Maximum Points After Enemy Battles	Medium	Array, Greedy	470	100.00
3206	Alternating Groups I	Easy	Array, Sliding_Window	167	88.14
3203	Find Minimum Diameter After Merging Two Trees	Hard	Depth_First_Search, Breadth_First_Search, Tree, Graph	1156	100.00
3202	Find the Maximum Length of Valid Subsequence II	Medium	Array, Dynamic_Programming	255	97.30
3201	Find the Maximum Length of Valid Subsequence I	Medium	Array, Dynamic_Programming	512	89.36
3200	Maximum Height of a Triangle	Easy	Array, Enumeration	136	81.36
3197	Find the Minimum Area to Cover All Ones II	Hard	Array, Matrix, Enumeration	216	100.00
3196	Maximize Total Cost of Alternating Subarrays	Medium	Array, Dynamic_Programming	496	73.81
3195	Find the Minimum Area to Cover All Ones I	Medium	Array, Matrix	1068	73.91
3194	Minimum Average of Smallest and Largest Elements	Easy	Array, Sorting, Two_Pointers	192	94.25
3193	Count the Number of Inversions	Hard	Array, Dynamic_Programming	243	94.74
3192	Minimum Operations to Make Binary Array Elements Equal to One II	Medium	Array, Dynamic_Programming, Greedy	684	64.29
3191	Minimum Operations to Make Binary Array Elements Equal to One I	Medium	Array, Bit_Manipulation, Prefix_Sum, Sliding_Window, Queue	653	57.35
3190	Find Minimum Operations to Make All Elements Divisible by Three	Easy	Array, Math	153	87.95
3187	Peaks in Array	Hard	Array, Segment_Tree, Binary_Indexed_Tree	1339	80.00
3186	Maximum Total Damage With Spell Casting	Medium	Array, Hash_Table, Dynamic_Programming, Sorting, Binary_Search, Two_Pointers, Counting	1106	92.73
3185	Count Pairs That Form a Complete Day II	Medium	Array, Hash_Table, Counting	578	78.33
3184	Count Pairs That Form a Complete Day I	Easy	Array, Hash_Table, Counting	171	68.42
3181	Maximum Total Reward Using Operations II	Hard	Array, Dynamic_Programming, Bit_Manipulation	376	100.00
3180	Maximum Total Reward Using Operations I	Medium	Array, Dynamic_Programming	183	100.00
3179	Find the N-th Value After K Seconds	Medium	Array, Math, Simulation, Prefix_Sum, Combinatorics	175	100.00
3178	Find the Child Who Has the Ball After K Seconds	Easy	Math, Simulation	136	82.35
3177	Find the Maximum Length of a Good Subsequence II	Hard	Array, Hash_Table, Dynamic_Programming	284	100.00
3176	Find the Maximum Length of a Good Subsequence I	Medium	Array, Hash_Table, Dynamic_Programming	183	100.00
3175	Find The First Player to win K Games in a Row	Medium	Array, Simulation	536	100.00
3174	Clear Digits	Easy	String, Hash_Table, Simulation	180	70.18
3171	Find Subarray With Bitwise AND Closest to K	Hard	Array, Binary_Search, Bit_Manipulation, Segment_Tree	520	100.00
3170	Lexicographically Minimum String After Removing Stars	Medium	String, Hash_Table, Greedy, Stack, Heap_Priority_Queue	316	100.00
3169	Count Days Without Meetings	Medium	Array, Sorting	733	97.59
3168	Minimum Number of Chairs in a Waiting Room	Easy	String, Simulation	148	86.52
3165	Maximum Sum of Subsequence With Non-adjacent Elements	Hard	Array, Dynamic_Programming, Divide_and_Conquer, Segment_Tree	109	100.00
3164	Find the Number of Good Pairs II	Medium	Array, Hash_Table	1175	90.00
3163	String Compression III	Medium	String	331	66.13
3162	Find the Number of Good Pairs I	Easy	Array, Hash_Table	182	54.41
3161	Block Placement Queries	Hard	Array, Binary_Search, Segment_Tree, Binary_Indexed_Tree	1701	100.00
3160	Find the Number of Distinct Colors Among the Balls	Medium	Array, Hash_Table, Simulation	1055	58.82
3159	Find Occurrences of an Element in an Array	Medium	Array, Hash_Table	810	98.28
3158	Find the XOR of Numbers Which Appear Twice	Easy	Array, Hash_Table, Bit_Manipulation	166	92.21
3154	Find Number of Ways to Reach the K-th Stair	Hard	Dynamic_Programming, Math, Bit_Manipulation, Memoization, Combinatorics	122	100.00
3153	Sum of Digit Differences of All Pairs	Medium	Array, Hash_Table, Math, Counting	491	95.74
3152	Special Array II	Medium	Array, Binary_Search, Prefix_Sum	707	93.83
3151	Special Array I	Easy	Array	165	92.21
3149	Find the Minimum Cost Array Permutation	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	329	100.00
3148	Maximum Difference Score in a Grid	Medium	Array, Dynamic_Programming, Matrix	777	84.62
3147	Taking Maximum Energy From the Mystic Dungeon	Medium	Array, Prefix_Sum	671	79.17
3146	Permutation Difference between Two Strings	Easy	String, Hash_Table	177	58.21
3145	Find Products of Elements of Big Array	Hard	Array, Binary_Search, Bit_Manipulation	210	100.00
3144	Minimum Substring Partition of Equal Character Frequency	Medium	String, Hash_Table, Dynamic_Programming, Counting	232	88.00
3143	Maximum Points Inside the Square	Medium	Array, String, Hash_Table, Sorting, Binary_Search	650	59.52
3142	Check if Grid Satisfies Conditions	Easy	Array, Matrix	170	91.84
3139	Minimum Cost to Equalize Array	Hard	Array, Greedy, Enumeration	495	100.00
3138	Minimum Length of Anagram Concatenation	Medium	String, Hash_Table, Counting	219	91.67
3137	Minimum Number of Operations to Make Word K-Periodic	Medium	String, Hash_Table, Counting	291	96.30
3136	Valid Word	Easy	String	160	92.50
3134	Find the Median of the Uniqueness Array	Hard	Array, Hash_Table, Binary_Search, Sliding_Window	733	100.00
3133	Minimum Array End	Medium	Bit_Manipulation	131	90.91
3132	Find the Integer Added to Array II	Medium	Array, Sorting, Two_Pointers, Enumeration	189	84.85
3131	Find the Integer Added to Array I	Easy	Array	162	98.15
3130	Find All Possible Stable Binary Arrays II	Hard	Dynamic_Programming, Prefix_Sum	242	100.00
3129	Find All Possible Stable Binary Arrays I	Medium	Dynamic_Programming, Prefix_Sum	169	92.86
3128	Right Triangles	Medium	Array, Hash_Table, Math, Counting, Combinatorics	975	40.63
3127	Make a Square with the Same Color	Easy	Array, Matrix, Enumeration	149	80.00
3123	Find Edges in Shortest Paths	Hard	Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path	931	100.00
3122	Minimum Number of Operations to Satisfy Conditions	Medium	Array, Dynamic_Programming, Matrix	948	80.77
3121	Count the Number of Special Characters II	Medium	String, Hash_Table	274	90.74
3120	Count the Number of Special Characters I	Easy	String, Hash_Table	145	97.26
3117	Minimum Sum of Values by Dividing Array	Hard	Array, Dynamic_Programming, Binary_Search, Bit_Manipulation, Queue, Segment_Tree	244	100.00
3116	Kth Smallest Amount With Single Denomination Combination	Hard	Array, Math, Binary_Search, Bit_Manipulation, Number_Theory, Combinatorics	158	100.00
3115	Maximum Prime Difference	Medium	Array, Math, Number_Theory	555	79.63
3114	Latest Time You Can Obtain After Replacing Characters	Easy	String, Enumeration	161	83.58
3113	Find the Number of Subarrays Where Boundary Elements Are Maximum	Hard	Array, Binary_Search, Stack, Monotonic_Stack	606	88.89
3112	Minimum Time to Visit Disappearing Nodes	Medium	Array, Heap_Priority_Queue, Graph, Shortest_Path	828	94.44
3111	Minimum Rectangles to Cover Points	Medium	Array, Sorting, Greedy	701	96.15
3110	Score of a String	Easy	String	144	91.51
3108	Minimum Cost Walk in Weighted Graph	Hard	Array, Bit_Manipulation, Graph, Union_Find	791	100.00
3107	Minimum Operations to Make Median of Array Equal to K	Medium	Array, Sorting, Greedy	554	100.00
3106	Lexicographically Smallest String After Operations With Constraint	Medium	String, Greedy	162	74.19
3105	Longest Strictly Increasing or Strictly Decreasing Subarray	Easy	Array	159	94.00
3102	Minimize Manhattan Distances	Hard	Array, Math	701	95.83
3101	Count Alternating Subarrays	Medium	Array, Math	499	97.78
3100	Water Bottles II	Medium	Math, Simulation	137	70.49
3099	Harshad Number	Easy	Math	119	82.67
3098	Find the Sum of Subsequence Powers	Hard	Array, Dynamic_Programming, Sorting	294	77.78
3097	Shortest Subarray With OR at Least K II	Medium	Array, Bit_Manipulation, Sliding_Window	489	93.33
3096	Minimum Levels to Gain More Points	Medium	Array, Prefix_Sum	850	100.00
3095	Shortest Subarray With OR at Least K I	Easy	Array, Bit_Manipulation, Sliding_Window	161	95.65
3093	Longest Common Suffix Queries	Hard	Array, String, Trie	860	89.29
3092	Most Frequent IDs	Medium	Array, Hash_Table, Heap_Priority_Queue, Ordered_Set	758	100.00
3091	Apply Operations to Make Sum of Array Greater Than or Equal to k	Medium	Math, Greedy, Enumeration	134	73.21
3090	Maximum Length Substring With Two Occurrences	Easy	String, Hash_Table, Sliding_Window	157	90.24
3086	Minimum Moves to Pick K Ones	Hard	Array, Greedy, Prefix_Sum, Sliding_Window	368	100.00
3085	Minimum Deletions to Make String K-Special	Medium	String, Hash_Table, Sorting, Greedy, Counting	221	93.33
3084	Count Substrings Starting and Ending with Given Character	Medium	String, Math, Counting	177	98.55
3083	Existence of a Substring in a String and Its Reverse	Easy	String, Hash_Table	168	79.49
3082	Find the Sum of the Power of All Subsequences	Hard	Array, Dynamic_Programming	176	90.00
3081	Replace Question Marks in String to Minimize Its Value	Medium	String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	249	100.00
3080	Mark Elements on Array by Performing Queries	Medium	Array, Hash_Table, Sorting, Heap_Priority_Queue, Simulation	937	97.78
3079	Find the Sum of Encrypted Integers	Easy	Array, Math	172	80.60
3077	Maximum Strength of K Disjoint Subarrays	Hard	Array, Dynamic_Programming, Prefix_Sum	351	75.00
3076	Shortest Uncommon Substring in an Array	Medium	Array, String, Hash_Table, Trie	256	100.00
3075	Maximize Happiness of Selected Children	Medium	Array, Sorting, Greedy	608	93.24
3074	Apple Redistribution into Boxes	Easy	Array, Sorting, Greedy	168	97.37
3072	Distribute Elements Into Two Arrays II	Hard	Array, Simulation, Segment_Tree, Binary_Indexed_Tree	890	100.00
3071	Minimum Operations to Write the Letter Y on a Grid	Medium	Array, Hash_Table, Matrix, Counting	268	91.11
3070	Count Submatrices with Top-Left Element and Sum Less Than k	Medium	Array, Matrix, Prefix_Sum	773	85.71
3069	Distribute Elements Into Two Arrays I	Easy	Array, Simulation	207	96.92
3068	Find the Maximum Sum of Node Values	Hard	Array, Dynamic_Programming, Sorting, Greedy, Tree, Bit_Manipulation	531	66.67
3067	Count Pairs of Connectable Servers in a Weighted Tree Network	Medium	Array, Depth_First_Search, Tree	578	83.33
3066	Minimum Operations to Exceed Threshold Value II	Medium	Array, Heap_Priority_Queue, Simulation	543	98.11
3065	Minimum Operations to Exceed Threshold Value I	Easy	Array	180	71.76
3049	Earliest Second to Mark Indices II	Hard	Array, Greedy, Binary_Search, Heap_Priority_Queue	220	100.00
3048	Earliest Second to Mark Indices I	Medium	Array, Binary_Search	223	75.00
3047	Find the Largest Area of Square Inside Two Rectangles	Medium	Array, Math, Geometry	753	40.42
3046	Split the Array	Easy	Array, Hash_Table, Counting	173	75.00
3045	Count Prefix and Suffix Pairs II	Hard	Array, String, Trie, Hash_Function, String_Matching, Rolling_Hash	344	100.00
3044	Most Frequent Prime	Medium	Array, Hash_Table, Math, Matrix, Counting, Enumeration, Number_Theory	198	100.00
3043	Find the Length of the Longest Common Prefix	Medium	Array, String, Hash_Table, Trie	623	76.32
3042	Count Prefix and Suffix Pairs I	Easy	Array, String, Trie, Hash_Function, String_Matching, Rolling_Hash	160	96.72
3041	Maximize Consecutive Elements in an Array After Modification	Hard	Array, Dynamic_Programming, Sorting	551	100.00
3040	Maximum Number of Operations With the Same Score II	Medium	Array, Dynamic_Programming, Memoization	179	100.00
3039	Apply Operations to Make String Empty	Medium	Array, Hash_Table, Sorting, Counting	335	97.73
3038	Maximum Number of Operations With the Same Score I	Easy	Array, Simulation	142	100.00
3036	Number of Subarrays That Match a Pattern II	Hard	Array, Hash_Function, String_Matching, Rolling_Hash	768	83.33
3035	Maximum Palindromes After Operations	Medium	Array, String, Hash_Table, Sorting, Greedy, Counting	214	100.00
3034	Number of Subarrays That Match a Pattern I	Medium	Array, Hash_Function, String_Matching, Rolling_Hash	225	38.09
3033	Modify the Matrix	Easy	Array, Matrix	270	41.94
3031	Minimum Time to Revert Word to Initial State II	Hard	String, Hash_Function, String_Matching, Rolling_Hash	328	52.94
3030	Find the Grid of Region Average	Medium	Array, Matrix	1250	86.96
3029	Minimum Time to Revert Word to Initial State I	Medium	String, Hash_Function, String_Matching, Rolling_Hash	160	82.05
3028	Ant on the Boundary	Easy	Array, Simulation, Prefix_Sum	155	87.32
3027	Find the Number of Ways to Place People II	Hard	Array, Math, Sorting, Enumeration, Geometry	477	78.95
3026	Maximum Good Subarray Sum	Medium	Array, Hash_Table, Prefix_Sum	756	71.43
3025	Find the Number of Ways to Place People I	Medium	Array, Math, Sorting, Enumeration, Geometry	252	44.12
3024	Type of Triangle	Easy	Array, Math, Sorting	163	81.03
3022	Minimize OR of Remaining Elements Using Operations	Hard	Array, Greedy, Bit_Manipulation	516	77.78
3021	Alice and Bob Playing Flower Game	Medium	Math	141	43.24
3020	Find the Maximum Number of Elements in Subset	Medium	Array, Hash_Table, Enumeration	626	82.22
3019	Number of Changing Keys	Easy	String, Breadth_First_Search, Graph, Prefix_Sum	157	80.52
3017	Count the Number of Houses at a Certain Distance II	Hard	Breadth_First_Search, Graph, Prefix_Sum	414	50.00
3016	Minimum Number of Pushes to Type Word II	Medium	String, Hash_Table, Sorting, Greedy, Breadth_First_Search, Graph, Prefix_Sum, Counting	290	92.00
3015	Count the Number of Houses at a Certain Distance I	Medium	Breadth_First_Search, Graph, Prefix_Sum	203	90.91
3014	Minimum Number of Pushes to Type Word I	Easy	String, Math, Greedy	152	58.67
3013	Divide an Array Into Subarrays With Minimum Cost II	Hard	Array, Hash_Table, Heap_Priority_Queue, Sliding_Window	1165	100.00
3012	Minimize Length of Array Using Operations	Medium	Array, Math, Greedy, Number_Theory	533	86.36
3011	Find if Array Can Be Sorted	Medium	Array, Sorting, Bit_Manipulation	199	79.49
3010	Divide an Array Into Subarrays With Minimum Cost I	Easy	Array, Sorting, Enumeration	170	94.23
3008	Find Beautiful Indices in the Given Array II	Hard	String, Binary_Search, Two_Pointers, Hash_Function, String_Matching, Rolling_Hash	730	96.67
3007	Maximum Number That Sum of the Prices Is Less Than or Equal to K	Medium	Dynamic_Programming, Binary_Search, Bit_Manipulation	133	100.00
3006	Find Beautiful Indices in the Given Array I	Medium	String, Binary_Search, Two_Pointers, Hash_Function, String_Matching, Rolling_Hash	287	94.92
3005	Count Elements With Maximum Frequency	Easy	Array, Hash_Table, Counting	168	80.00
3003	Maximize the Number of Partitions After Operations	Hard	String, Dynamic_Programming, Bit_Manipulation, Bitmask	147	100.00
3002	Maximum Size of a Set After Removals	Medium	Array, Hash_Table, Greedy	467	100.00
3001	Minimum Moves to Capture The Queen	Medium	Array, Enumeration	1	100.00
3000	Maximum Area of Longest Diagonal Rectangle	Easy	Array	167	94.44
2999	Count the Number of Powerful Integers	Hard	String, Dynamic_Programming, Math	163	100.00
2998	Minimum Number of Operations to Make X and Y Equal	Medium	Dynamic_Programming, Breadth_First_Search, Memoization	149	100.00
2997	Minimum Number of Operations to Make Array XOR Equal to K	Medium	Array, Bit_Manipulation	452	84.38
2996	Smallest Missing Integer Greater Than Sequential Prefix Sum	Easy	Array, Hash_Table, Sorting	174	83.33
2983	Palindrome Rearrangement Queries	Hard	String, Hash_Table, Prefix_Sum	905	87.50
2982	Find Longest Special Substring That Occurs Thrice II	Medium	String, Hash_Table, Binary_Search, Counting, Sliding_Window	343	100.00
2981	Find Longest Special Substring That Occurs Thrice I	Medium	String, Hash_Table, Binary_Search, Counting, Sliding_Window	208	90.70
2980	Check if Bitwise OR Has Trailing Zeros	Easy	Array, Bit_Manipulation	183	89.58
2977	Minimum Cost to Convert String II	Hard	Array, String, Dynamic_Programming, Graph, Trie, Shortest_Path	697	100.00
2976	Minimum Cost to Convert String I	Medium	Array, String, Graph, Shortest_Path	421	85.29
2975	Maximum Square Area by Removing Fences From a Field	Medium	Array, Hash_Table, Enumeration	1283	96.77
2974	Minimum Number Game	Easy	Array, Sorting, Heap_Priority_Queue, Simulation	213	97.92
2973	Find Number of Coins to Place in Tree Nodes	Hard	Dynamic_Programming, Sorting, Depth_First_Search, Tree, Heap_Priority_Queue	1134	90.91
2972	Count the Number of Incremovable Subarrays II	Hard	Array, Binary_Search, Two_Pointers	483	100.00
2971	Find Polygon With the Largest Perimeter	Medium	Array, Sorting, Greedy, Prefix_Sum	534	97.06
2970	Count the Number of Incremovable Subarrays I	Easy	Array, Binary_Search, Two_Pointers, Enumeration	170	100.00
2968	Apply Operations to Maximize Frequency Score	Hard	Array, Sorting, Binary_Search, Prefix_Sum, Sliding_Window	566	90.00
2967	Minimum Cost to Make Array Equalindromic	Medium	Array, Math, Sorting, Greedy	363	100.00
2966	Divide Array Into Arrays With Max Difference	Medium	Array, Sorting, Greedy	977	60.00
2965	Find Missing and Repeated Values	Easy	Array, Hash_Table, Math, Matrix	235	91.67
2963	Count the Number of Good Partitions	Hard	Array, Hash_Table, Math, Combinatorics	600	100.00
2962	Count Subarrays Where Max Element Appears at Least K Times	Medium	Array, Sliding_Window	587	88.37
2961	Double Modular Exponentiation	Medium	Array, Math, Simulation	197	92.50
2960	Count Tested Devices After Test Operations	Easy	Array, Simulation	168	86.96
2959	Number of Possible Sets of Closing Branches	Hard	Bit_Manipulation, Heap_Priority_Queue, Graph, Enumeration, Shortest_Path	231	87.50
2958	Length of Longest Subarray With at Most K Frequency	Medium	Array, Hash_Table, Sliding_Window	485	100.00
2957	Remove Adjacent Almost-Equal Characters	Medium	String, Dynamic_Programming, Greedy	158	56.52
2956	Find Common Elements Between Two Arrays	Easy	Array, Hash_Table	271	94.20
2954	Count the Number of Infection Sequences	Hard	Array, Math, Combinatorics	1493	100.00
2953	Count Complete Substrings	Hard	String, Hash_Table, Sliding_Window	315	100.00
2952	Minimum Number of Coins to be Added	Medium	Array, Sorting, Greedy	439	87.10
2951	Find the Peaks	Easy	Array, Enumeration	188	93.75
2949	Count Beautiful Substrings II	Hard	String, Hash_Table, Math, Prefix_Sum, Number_Theory	299	100.00
2948	Make Lexicographically Smallest Array by Swapping Elements	Medium	Array, Sorting, Union_Find	928	94.59
2947	Count Beautiful Substrings I	Medium	String, Prefix_Sum, Enumeration	291	59.52
2946	Matrix Similarity After Cyclic Shifts	Easy	Array, Math, Matrix, Simulation	210	75.00
2945	Find Maximum Non-decreasing Array Length	Hard	Array, Dynamic_Programming, Binary_Search, Stack, Monotonic_Stack, Queue, Monotonic_Queue	636	87.50
2944	Minimum Number of Coins for Fruits	Medium	Array, Dynamic_Programming, Heap_Priority_Queue, Queue, Monotonic_Queue	194	84.62
2943	Maximize Area of Square Hole in Grid	Medium	Array, Sorting	180	86.67
2942	Find Words Containing Character	Easy	Array, String	216	98.97
2940	Find Building Where Alice and Bob Can Meet	Hard	Array, Binary_Search, Stack, Heap_Priority_Queue, Monotonic_Stack, Segment_Tree, Binary_Indexed_Tree	928	90.00
2939	Maximum Xor Product	Medium	Math, Greedy, Bit_Manipulation	151	76.19
2938	Separate Black and White Balls	Medium	String, Greedy, Two_Pointers	199	98.21
2937	Make Three Strings Equal	Easy	String	186	83.78
2935	Maximum Strong Pair XOR II	Hard	Array, Hash_Table, Bit_Manipulation, Sliding_Window, Trie	748	84.38
2934	Minimum Operations to Maximize Last Elements in Arrays	Medium	Array, Greedy	243	81.25
2933	High-Access Employees	Medium	Array, String, Hash_Table, Sorting	304	91.67
2932	Maximum Strong Pair XOR I	Easy	Array, Hash_Table, Bit_Manipulation, Sliding_Window, Trie	192	43.08
2931	Maximum Spending After Buying Items	Hard	Array, Sorting, Greedy, Matrix, Heap_Priority_Queue	541	93.75
2930	Number of Strings Which Can Be Rearranged to Contain Substring	Medium	Dynamic_Programming, Math, Combinatorics	132	100.00
2929	Distribute Candies Among Children II	Medium	Math, Enumeration, Combinatorics	163	66.67
2928	Distribute Candies Among Children I	Easy	Math, Enumeration, Combinatorics	141	86.36
2926	Maximum Balanced Subsequence Sum	Hard	Array, Dynamic_Programming, Binary_Search, Segment_Tree, Binary_Indexed_Tree	636	100.00
2925	Maximum Score After Applying Operations on a Tree	Medium	Dynamic_Programming, Depth_First_Search, Tree	706	81.82
2924	Find Champion II	Medium	Graph	422	81.82
2923	Find Champion I	Easy	Array, Matrix	320	58.62
2920	Maximum Points After Collecting Coins From All Nodes	Hard	Array, Dynamic_Programming, Depth_First_Search, Tree, Bit_Manipulation	1007	100.00
2919	Minimum Increment Operations to Make Array Beautiful	Medium	Array, Dynamic_Programming	520	62.50
2918	Minimum Equal Sum of Two Arrays After Replacing Zeros	Medium	Array, Greedy	598	100.00
2917	Find the K-or of an Array	Easy	Array, Bit_Manipulation	191	76.47
2916	Subarrays Distinct Element Sum of Squares II	Hard	Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree	467	100.00
2915	Length of the Longest Subsequence That Sums to Target	Medium	Array, Dynamic_Programming	552	66.67
2914	Minimum Number of Changes to Make Binary String Beautiful	Medium	String	180	100.00
2913	Subarrays Distinct Element Sum of Squares I	Easy	Array, Hash_Table	184	95.74
2911	Minimum Changes to Make K Semi-palindromes	Hard	String, Dynamic_Programming, Two_Pointers	216	100.00
2910	Minimum Number of Groups to Create a Valid Assignment	Medium	Array, Hash_Table, Greedy	745	75.00
2909	Minimum Sum of Mountain Triplets II	Medium	Array	463	100.00
2908	Minimum Sum of Mountain Triplets I	Easy	Array	174	73.33
2906	Construct Product Matrix	Medium	Array, Matrix, Prefix_Sum	1016	100.00
2905	Find Indices With Index and Value Difference II	Medium	Array	485	50.00
2904	Shortest and Lexicographically Smallest Beautiful String	Medium	String, Sliding_Window	169	66.67
2903	Find Indices With Index and Value Difference I	Easy	Array	192	100.00
2902	Count of Sub-Multisets With Bounded Sum	Hard	Array, Hash_Table, Dynamic_Programming, Sliding_Window	263	87.50
2901	Longest Unequal Adjacent Groups Subsequence II	Medium	Array, String, Dynamic_Programming	305	100.00
2900	Longest Unequal Adjacent Groups Subsequence I	Easy	Array, String, Dynamic_Programming, Greedy	294	100.00
2899	Last Visited Integers	Easy	Array, String, Simulation	209	72.73
2897	Apply Operations on Array to Maximize Sum of Squares	Hard	Array, Hash_Table, Greedy, Bit_Manipulation	572	100.00
2896	Apply Operations to Make Two Strings Equal	Medium	String, Dynamic_Programming	181	66.67
2895	Minimum Processing Time	Medium	Array, Sorting, Greedy	662	80.00
2894	Divisible and Non-divisible Sums Difference	Easy	Math	135	76.92
2891	Method Chaining	Easy		412	99.23
2890	Reshape Data: Melt	Easy		446	97.89
2889	Reshape Data: Pivot	Easy		416	99.87
2888	Reshape Data: Concatenate	Easy		441	96.26
2887	Fill Missing Data	Easy		404	97.11
2886	Change Data Type	Easy		421	94.57
2885	Rename Columns	Easy		467	68.13
2884	Modify Columns	Easy		401	96.35
2883	Drop Missing Data	Easy		429	94.97
2882	Drop Duplicate Rows	Easy		405	97.36
2881	Create a New Column	Easy		437	81.98
2880	Select Data	Easy		428	94.99
2879	Display the First Three Rows	Easy		406	96.44
2878	Get the Size of a DataFrame	Easy		413	94.68
2877	Create a DataFrame from List	Easy		406	82.57
2876	Count Visited Nodes in a Directed Graph	Hard	Dynamic_Programming, Graph, Memoization	922	100.00
2875	Minimum Size Subarray in Infinite Array	Medium	Array, Hash_Table, Prefix_Sum, Sliding_Window	372	100.00
2874	Maximum Value of an Ordered Triplet II	Medium	Array	508	100.00
2873	Maximum Value of an Ordered Triplet I	Easy	Array	157	94.12
2872	Maximum Number of K-Divisible Components	Hard	Dynamic_Programming, Depth_First_Search, Tree	780	100.00
2871	Split Array Into Maximum Number of Subarrays	Medium	Array, Greedy, Bit_Manipulation	490	100.00
2870	Minimum Number of Operations to Make Array Empty	Medium	Array, Hash_Table, Greedy, Counting	503	80.00
2869	Minimum Operations to Collect Elements	Easy	Array, Hash_Table	156	100.00
2867	Count Valid Paths in a Tree	Hard	Dynamic_Programming, Math, Depth_First_Search, Tree, Number_Theory	793	100.00
2866	Beautiful Towers II	Medium	Array, Stack, Monotonic_Stack	676	85.71
2865	Beautiful Towers I	Medium	Array, Stack, Monotonic_Stack	232	75.00
2864	Maximum Odd Binary Number	Easy	String, Math, Greedy	176	90.91
2862	Maximum Element-Sum of a Complete Subset of Indices	Hard	Array, Math, Number_Theory	259	100.00
2861	Maximum Number of Alloys	Medium	Array, Binary_Search	289	100.00
2860	Happy Students	Medium	Array, Sorting, Enumeration	512	100.00
2859	Sum of Values at Indices With K Set Bits	Easy	Array, Bit_Manipulation	177	100.00
2858	Minimum Edge Reversals So Every Node Is Reachable	Hard	Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph	1161	100.00
2857	Count Pairs of Points With Distance k	Medium	Array, Hash_Table, Bit_Manipulation	1212	100.00
2856	Minimum Array Length After Pair Removals	Medium	Array, Hash_Table, Greedy, Binary_Search, Two_Pointers, Counting	647	100.00
2855	Minimum Right Shifts to Sort the Array	Easy	Array	169	75.00
2851	String Transformation	Hard	String, Dynamic_Programming, Math, String_Matching	377	100.00
2850	Minimum Moves to Spread Stones Over Grid	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix	133	100.00
2849	Determine if a Cell Is Reachable at a Given Time	Medium	Math	138	80.95
2848	Points That Intersect With Cars	Easy	Hash_Table, Math, Prefix_Sum	190	100.00
2846	Minimum Edge Weight Equilibrium Queries in a Tree	Hard	Array, Tree, Graph, Strongly_Connected_Component	982	100.00
2845	Count of Interesting Subarrays	Medium	Array, Hash_Table, Prefix_Sum	703	100.00
2844	Minimum Operations to Make a Special Number	Medium	String, Math, Greedy, Enumeration	162	60.00
2843	Count Symmetric Integers	Easy	Math, Enumeration	203	88.24
2842	Count K-Subsequences of a String With Maximum Beauty	Hard	String, Hash_Table, Math, Greedy, Combinatorics	217	100.00
2841	Maximum Sum of Almost Unique Subarray	Medium	Array, Hash_Table, Sliding_Window	387	100.00
2840	Check if Strings Can be Made Equal With Operations II	Medium	String, Hash_Table, Sorting	225	100.00
2839	Check if Strings Can be Made Equal With Operations I	Easy	String	154	100.00
2836	Maximize Value of Function in a Ball Passing Game	Hard	Array, Dynamic_Programming, Bit_Manipulation	933	100.00
2835	Minimum Operations to Form Subsequence With Target Sum	Hard	Array, Greedy, Bit_Manipulation	183	100.00
2834	Find the Minimum Possible Sum of a Beautiful Array	Medium	Math, Greedy	130	100.00
2833	Furthest Point From Origin	Easy	Array, Counting	160	81.25
2831	Find the Longest Equal Subarray	Medium	Array, Hash_Table, Binary_Search, Sliding_Window	663	100.00
2830	Maximize the Profit as the Salesman	Medium	Array, Dynamic_Programming, Sorting, Binary_Search	776	100.00
2829	Determine the Minimum Sum of a k-avoiding Array	Medium	Math, Greedy	162	75.00
2828	Check if a String Is an Acronym of Words	Easy	Array, String	180	90.14
2827	Number of Beautiful Integers in the Range	Hard	Dynamic_Programming, Math	169	100.00
2826	Sorting Three Groups	Medium	Array, Dynamic_Programming	250	100.00
2825	Make String a Subsequence Using Cyclic Increments	Medium	String, Two_Pointers	227	83.33
2824	Count Pairs Whose Sum is Less than Target	Easy	Array, Sorting, Two_Pointers	168	90.62
2818	Apply Operations to Maximize Score	Hard	Array, Math, Greedy, Stack, Monotonic_Stack, Number_Theory	727	100.00
2817	Minimum Absolute Difference Between Elements With Constraint	Medium	Array, Binary_Search, Ordered_Set	759	100.00
2816	Double a Number Represented as a Linked List	Medium	Math, Stack, Linked_List	393	100.00
2815	Max Pair Sum in an Array	Easy	Array, Hash_Table	223	82.35
2813	Maximum Elegance of a K-Length Subsequence	Hard	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue	853	100.00
2812	Find the Safest Path in a Grid	Medium	Array, Breadth_First_Search, Binary_Search, Matrix, Union_Find	902	100.00
2811	Check if it is Possible to Split Array	Medium	Array, Dynamic_Programming, Greedy	180	100.00
2810	Faulty Keyboard	Easy	String, Simulation	196	91.67
2809	Minimum Time to Make Array Sum At Most x	Hard	Array, Dynamic_Programming, Sorting	325	100.00
2808	Minimum Seconds to Equalize a Circular Array	Medium	Array, Hash_Table, Greedy	847	50.00
2807	Insert Greatest Common Divisors in Linked List	Medium	Array, Math, Linked_List	225	67.65
2806	Account Balance After Rounded Purchase	Easy	Math	108	100.00
2801	Count Stepping Numbers in Range	Hard	String, Dynamic_Programming	288	100.00
2800	Shortest String That Contains Three Strings	Medium	String, Greedy, Enumeration	259	100.00
2799	Count Complete Subarrays in an Array	Medium	Array, Hash_Table, Sliding_Window	206	96.97
2798	Number of Employees Who Met the Target	Easy	Array, Enumeration	153	92.50
2791	Count Paths That Can Form a Palindrome in a Tree	Hard	Dynamic_Programming, Depth_First_Search, Tree, Bit_Manipulation, Bitmask	683	100.00
2790	Maximum Number of Groups With Increasing Length	Hard	Array, Math, Sorting, Greedy, Binary_Search	545	100.00
2789	Largest Element in an Array after Merge Operations	Medium	Array, Greedy, Prefix_Sum	683	73.68
2788	Split Strings by Separator	Easy	Array, String	314	85.45
2787	Ways to Express an Integer as Sum of Powers	Medium	Dynamic_Programming	152	100.00
2786	Visit Array Positions to Maximize Score	Medium	Array, Dynamic_Programming	625	84.00
2785	Sort Vowels in a String	Medium	String, Sorting	233	100.00
2784	Check if Array is Good	Easy	Array, Hash_Table, Sorting	177	88.89
2781	Length of the Longest Valid Substring	Hard	Array, String, Hash_Table, Sliding_Window	647	100.00
2780	Minimum Index of a Valid Split	Medium	Array, Hash_Table, Sorting	640	91.67
2779	Maximum Beauty of an Array After Applying Operation	Medium	Array, Sorting, Binary_Search, Sliding_Window	649	96.97
2778	Sum of Squares of Special Elements	Easy	Array, Simulation	183	86.44
2772	Apply Operations to Make All Array Elements Equal to Zero	Medium	Array, Prefix_Sum	578	97.06
2771	Longest Non-decreasing Subarray From Two Arrays	Medium	Array, Dynamic_Programming	665	96.88
2770	Maximum Number of Jumps to Reach the Last Index	Medium	Array, Dynamic_Programming	325	51.16
2769	Find the Maximum Achievable Number	Easy	Math	134	97.89
2768	Number of Black Blocks	Medium	Array, Hash_Table, Enumeration	719	100.00
2767	Partition String Into Minimum Beautiful Substrings	Medium	String, Hash_Table, Dynamic_Programming, Backtracking	162	96.00
2766	Relocate Marbles	Medium	Array, Hash_Table, Sorting, Simulation	1038	100.00
2765	Longest Alternating Subarray	Easy	Array, Enumeration	191	97.92
2763	Sum of Imbalance Numbers of All Subarrays	Hard	Array, Hash_Table, Ordered_Set	417	95.24
2762	Continuous Subarrays	Medium	Array, Heap_Priority_Queue, Sliding_Window, Ordered_Set, Queue, Monotonic_Queue	492	100.00
2761	Prime Pairs With Target Sum	Medium	Array, Math, Enumeration, Number_Theory	537	100.00
2760	Longest Even Odd Subarray With Threshold	Easy	Array, Sliding_Window	285	95.45
2751	Robot Collisions	Hard	Array, Sorting, Stack, Simulation	1049	100.00
2750	Ways to Split Array Into Good Subarrays	Medium	Array, Dynamic_Programming, Math	916	100.00
2749	Minimum Operations to Make the Integer Zero	Medium	Bit_Manipulation, Brainteaser	132	91.67
2748	Number of Beautiful Pairs	Easy	Array, Math, Number_Theory	227	100.00
2747	Count Zero Request Servers	Medium	Array, Hash_Table, Sorting, Sliding_Window	991	100.00
2746	Decremental String Concatenation	Medium	Array, String, Dynamic_Programming	264	100.00
2745	Construct the Longest New String	Medium	Math, Greedy, Brainteaser	146	97.37
2744	Find Maximum Number of String Pairs	Easy	Array, String, Hash_Table, Simulation	162	96.81
2742	Painting the Walls	Hard	Array, Dynamic_Programming	268	100.00
2741	Special Permutations	Medium	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	623	82.35
2740	Find the Value of the Partition	Medium	Array, Sorting	431	100.00
2739	Total Distance Traveled	Easy	Math, Simulation	177	100.00
2736	Maximum Sum Queries	Hard	Array, Sorting, Binary_Search, Stack, Monotonic_Stack, Segment_Tree, Binary_Indexed_Tree	1043	100.00
2735	Collecting Chocolates	Medium	Array, Enumeration	237	100.00
2734	Lexicographically Smallest String After Substring Operation	Medium	String, Greedy	384	100.00
2733	Neither Minimum nor Maximum	Easy	Array, Sorting	286	100.00
2732	Find a Good Subset of the Matrix	Hard	Array, Greedy, Matrix, Bit_Manipulation	760	98.36
2731	Movement of Robots	Medium	Array, Sorting, Prefix_Sum, Brainteaser	414	100.00
2730	Find the Longest Semi-Repetitive Substring	Medium	String, Sliding_Window	251	84.62
2729	Check if The Number is Fascinating	Easy	Hash_Table, Math	131	100.00
2727	Is Object Empty	Easy		49	98.24
2726	Calculator with Method Chaining	Easy		43	99.15
2725	Interval Cancellation	Easy		51	98.87
2724	Sort By	Easy		132	96.70
2723	Add Two Promises	Easy		56	97.63
2722	Join Two Arrays by ID	Medium		280	98.29
2721	Execute Asynchronous Functions in Parallel	Medium		63	99.09
2719	Count of Integers	Hard	String, Dynamic_Programming, Math	208	100.00
2718	Sum of Matrix After Queries	Medium	Array, Hash_Table	668	100.00
2717	Semi-Ordered Permutation	Easy	Array, Simulation	186	100.00
2716	Minimize String Length	Easy	String, Hash_Table	204	97.62
2715	Timeout Cancellation	Easy		53	97.68
2713	Maximum Strictly Increasing Cells in a Matrix	Hard	Array, Dynamic_Programming, Sorting, Binary_Search, Matrix, Memoization	1141	100.00
2712	Minimum Cost to Make All Characters Equal	Medium	String, Dynamic_Programming, Greedy	200	100.00
2711	Difference of Number of Distinct Values on Diagonals	Medium	Array, Hash_Table, Matrix	281	100.00
2710	Remove Trailing Zeros From a String	Easy	String	191	93.02
2709	Greatest Common Divisor Traversal	Hard	Array, Math, Union_Find, Number_Theory	892	81.82
2708	Maximum Strength of a Group	Medium	Array, Sorting, Greedy, Backtracking	183	100.00
2707	Extra Characters in a String	Medium	Array, String, Hash_Table, Dynamic_Programming, Trie	276	85.71
2706	Buy Two Chocolates	Easy	Array, Sorting	187	96.43
2705	Compact Object	Medium		78	99.38
2704	To Be Or Not To Be	Easy		49	97.88
2703	Return Length of Arguments Passed	Easy		47	98.59
2699	Modify Graph Edge Weights	Hard	Heap_Priority_Queue, Graph, Shortest_Path	1592	40.00
2698	Find the Punishment Number of an Integer	Medium	Math, Backtracking	133	100.00
2697	Lexicographically Smallest Palindrome	Easy	String, Two_Pointers	267	100.00
2696	Minimum String Length After Removing Substrings	Easy	String, Stack, Simulation	185	100.00
2695	Array Wrapper	Easy		40	100.00
2694	Event Emitter	Medium		45	99.58
2693	Call Function with Custom Context	Medium	Array, Dynamic_Programming, Matrix	51	97.92
2685	Count the Number of Complete Components	Medium	Array, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Matrix, Graph	436	100.00
2684	Maximum Number of Moves in a Grid	Medium	Array, Dynamic_Programming, Matrix	509	100.00
2683	Neighboring Bitwise XOR	Medium	Array, Bit_Manipulation	988	100.00
2682	Find the Losers of the Circular Game	Easy	Array, Hash_Table, Simulation	186	100.00
2681	Power of Heroes	Hard	Array, Math, Sorting, Prefix_Sum	454	85.71
2680	Maximum OR	Medium	Array, Greedy, Bit_Manipulation, Prefix_Sum	592	90.91
2679	Sum in a Matrix	Medium	Array, Sorting, Matrix, Heap_Priority_Queue, Simulation	581	100.00
2678	Number of Senior Citizens	Easy	Array, String	163	96.30
2677	Chunk Array	Easy		55	96.89
2673	Make Costs of Paths Equal in a Binary Tree	Medium	Array, Dynamic_Programming, Greedy, Tree, Binary_Tree	645	75.00
2672	Number of Adjacent Elements With the Same Color	Medium	Array	1208	100.00
2671	Frequency Tracker	Medium	Hash_Table, Design	1109	80.00
2670	Find the Distinct Difference Array	Easy	Array, Hash_Table	320	94.74
2667	Create Hello World Function	Easy		45	94.20
2666	Allow One Function Call	Easy		50	88.35
2665	Counter II	Easy		54	94.09
2663	Lexicographically Smallest Beautiful String	Hard	String, Greedy	324	100.00
2662	Minimum Cost of a Path With Special Roads	Medium	Array, Heap_Priority_Queue, Graph, Shortest_Path	690	100.00
2661	First Completely Painted Row or Column	Medium	Array, Hash_Table, Matrix	901	100.00
2660	Determine the Winner of a Bowling Game	Easy	Array, Simulation	263	85.71
2659	Make Array Empty	Hard	Array, Sorting, Greedy, Binary_Search, Ordered_Set, Segment_Tree, Binary_Indexed_Tree	728	100.00
2658	Maximum Number of Fish in a Grid	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	269	80.00
2657	Find the Prefix Common Array of Two Arrays	Medium	Array, Hash_Table	288	88.89
2656	Maximum Sum With Exactly K Elements	Easy	Array, Greedy	241	93.94
2654	Minimum Number of Operations to Make All Array Elements Equal to 1	Medium	Array, Math, Number_Theory	172	100.00
2653	Sliding Subarray Beauty	Medium	Array, Hash_Table, Sliding_Window	1264	66.67
2652	Sum Multiples	Easy	Array, Math, Number_Theory	136	97.53
2651	Calculate Delayed Arrival Time	Easy	Math	129	88.00
2650	Design Cancellable Function	Hard		58	93.15
2649	Nested Array Generator	Medium		138	86.92
2648	Generate Fibonacci Sequence	Easy		42	98.08
2646	Minimize the Total Price of the Trips	Hard	Array, Dynamic_Programming, Depth_First_Search, Tree, Graph	264	100.00
2645	Minimum Additions to Make Valid String	Medium	String, Dynamic_Programming, Greedy, Stack	154	100.00
2644	Find the Maximum Divisibility Score	Easy	Array	585	100.00
2643	Row With Maximum Ones	Easy	Array, Matrix	530	100.00
2642	Design Graph With Shortest Path Calculator	Hard	Design, Heap_Priority_Queue, Graph, Shortest_Path	789	100.00
2641	Cousins in Binary Tree II	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	922	90.91
2640	Find the Score of All Prefixes of an Array	Medium	Array, Prefix_Sum	587	100.00
2639	Find the Width of Columns of a Grid	Easy	Array, Matrix	222	100.00
2637	Promise Time Limit	Medium		57	84.99
2635	Apply Transform Over Each Element in Array	Easy		43	98.46
2634	Filter Elements from Array	Easy		44	98.04
2631	Group By	Medium		101	99.50
2630	Memoize II	Hard		264	98.86
2629	Function Composition	Easy		58	95.63
2627	Debounce	Medium		50	98.23
2626	Array Reduce Transformation	Easy		52	91.40
2625	Flatten Deeply Nested Array	Medium		84	98.71
2624	Snail Traversal	Medium		175	92.96
2623	Memoize	Medium		264	97.20
2622	Cache With Time Limit	Medium		51	94.82
2621	Sleep	Easy		40	99.59
2620	Counter	Easy		43	98.60
2619	Array Prototype Last	Easy		41	98.99
2618	Check if Object Instance of Class	Medium		82	99.55
2617	Minimum Number of Visited Cells in a Grid	Hard	Array, Dynamic_Programming, Binary_Search, Stack, Union_Find, Segment_Tree, Binary_Indexed_Tree	1255	100.00
2616	Minimize the Maximum Difference of Pairs	Medium	Array, Greedy, Binary_Search	556	100.00
2615	Sum of Distances	Medium	Array, Hash_Table, Prefix_Sum	902	100.00
2614	Prime In Diagonal	Easy	Array, Math, Matrix, Number_Theory	465	100.00
2612	Minimum Reverse Operations	Hard	Array, Breadth_First_Search, Ordered_Set	923	100.00
2611	Mice and Cheese	Medium	Array, Sorting, Greedy, Heap_Priority_Queue	554	100.00
2610	Convert an Array Into a 2D Array With Conditions	Medium	Array, Hash_Table	240	88.24
2609	Find the Longest Balanced Substring of a Binary String	Easy	String	174	100.00
2608	Shortest Cycle in a Graph	Hard	Breadth_First_Search, Graph	1061	100.00
2607	Make K-Subarray Sums Equal	Medium	Array, Math, Sorting, Number_Theory	1062	100.00
2606	Find the Substring With Maximum Cost	Medium	Array, String, Hash_Table, Dynamic_Programming	238	100.00
2605	Form Smallest Number From Two Digit Arrays	Easy	Array, Hash_Table, Enumeration	161	100.00
2603	Collect Coins in a Tree	Hard	Array, Tree, Graph, Topological_Sort	986	100.00
2602	Minimum Operations to Make All Array Elements Equal	Medium	Array, Sorting, Binary_Search, Prefix_Sum	790	100.00
2601	Prime Subtraction Operation	Medium	Array, Math, Greedy, Binary_Search, Number_Theory	233	100.00
2600	K Items With the Maximum Sum	Easy	Math, Greedy	145	100.00
2598	Smallest Missing Non-negative Integer After Operations	Medium	Array, Hash_Table, Math, Greedy	594	100.00
2597	The Number of Beautiful Subsets	Medium	Array, Dynamic_Programming, Backtracking	194	100.00
2596	Check Knight Tour Configuration	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation	179	100.00
2595	Number of Even and Odd Bits	Easy	Bit_Manipulation	177	100.00
2594	Minimum Time to Repair Cars	Medium	Array, Binary_Search	416	100.00
2593	Find Score of an Array After Marking All Elements	Medium	Array, Sorting, Heap_Priority_Queue, Simulation	738	100.00
2592	Maximize Greatness of an Array	Medium	Array, Sorting, Greedy, Two_Pointers	748	100.00
2591	Distribute Money to Maximum Children	Easy	Math, Greedy	155	100.00
2589	Minimum Time to Complete All Tasks	Hard	Array, Sorting, Greedy, Binary_Search, Stack	422	100.00
2588	Count the Number of Beautiful Subarrays	Medium	Array, Hash_Table, Bit_Manipulation, Prefix_Sum	785	100.00
2587	Rearrange Array to Maximize Prefix Score	Medium	Array, Sorting, Greedy, Prefix_Sum	612	100.00
2586	Count the Number of Vowel Strings in Range	Easy	Array, String	195	100.00
2585	Number of Ways to Earn Points	Hard	Array, Dynamic_Programming	263	100.00
2584	Split the Array to Make Coprime Products	Hard	Array, Hash_Table, Math, Number_Theory	341	100.00
2583	Kth Largest Sum in a Binary Tree	Medium	Breadth_First_Search, Tree, Binary_Search	557	83.33
2582	Pass the Pillow	Easy	Math, Simulation	122	85.71
2581	Count Number of Possible Root Nodes	Hard	Hash_Table, Dynamic_Programming, Depth_First_Search, Tree	1352	100.00
2580	Count Ways to Group Overlapping Ranges	Medium	Array, Sorting	669	100.00
2579	Count Total Number of Colored Cells	Medium	Math	109	100.00
2578	Split With Minimum Sum	Easy	Math, Sorting, Greedy	121	75.00
2577	Minimum Time to Visit a Cell In a Grid	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path	1446	100.00
2576	Find the Maximum Number of Marked Indices	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers	610	100.00
2575	Find the Divisibility Array of a String	Medium	Array, String, Math	507	100.00
2574	Left and Right Sum Differences	Easy	Array, Prefix_Sum	203	100.00
2573	Find the String with LCP	Hard	String, Dynamic_Programming, Greedy, Union_Find	853	100.00
2572	Count the Number of Square-Free Subsets	Medium	Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask	218	100.00
2571	Minimum Operations to Reduce an Integer to 0	Medium	Dynamic_Programming, Greedy, Bit_Manipulation	131	100.00
2570	Merge Two 2D Arrays by Summing Values	Easy	Array, Hash_Table, Two_Pointers	221	91.67
2569	Handling Sum Queries After Update	Hard	Array, Segment_Tree	1751	100.00
2568	Minimum Impossible OR	Medium	Array, Bit_Manipulation, Brainteaser	468	100.00
2567	Minimum Score by Changing Two Elements	Medium	Array, Sorting, Greedy	496	100.00
2566	Maximum Difference by Remapping a Digit	Easy	Math, Greedy	125	100.00
2565	Subsequence With the Minimum Score	Hard	String, Binary_Search, Two_Pointers	204	100.00
2564	Substring XOR Queries	Medium	Array, String, Hash_Table, Bit_Manipulation	1603	100.00
2563	Count the Number of Fair Pairs	Medium	Array, Sorting, Binary_Search, Two_Pointers	553	100.00
2562	Find the Array Concatenation Value	Easy	Array, Two_Pointers, Simulation	175	100.00
2561	Rearranging Fruits	Hard	Array, Hash_Table, Greedy	746	100.00
2560	House Robber IV	Medium	Array, Binary_Search	467	100.00
2559	Count Vowel Strings in Ranges	Medium	Array, String, Prefix_Sum	638	100.00
2558	Take Gifts From the Richest Pile	Easy	Array, Heap_Priority_Queue, Simulation	169	100.00
2556	Disconnect Path in a Binary Matrix by at Most One Flip	Medium	Array, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Matrix	571	100.00
2555	Maximize Win From Two Segments	Medium	Array, Binary_Search, Sliding_Window	388	100.00
2554	Maximum Number of Integers to Choose From a Range I	Medium	Array, Hash_Table, Sorting, Greedy, Binary_Search	543	100.00
2553	Separate the Digits in an Array	Easy	Array, Simulation	210	100.00
2552	Count Increasing Quadruplets	Hard	Array, Dynamic_Programming, Prefix_Sum, Enumeration, Binary_Indexed_Tree	268	66.67
2551	Put Marbles in Bags	Hard	Array, Sorting, Greedy, Heap_Priority_Queue	818	100.00
2550	Count Collisions of Monkeys on a Polygon	Medium	Math, Recursion	111	100.00
2549	Count Distinct Numbers on Board	Easy	Array, Hash_Table, Math, Simulation	113	100.00
2547	Minimum Cost to Split an Array	Hard	Array, Hash_Table, Dynamic_Programming, Counting	400	100.00
2546	Apply Bitwise Operations to Make Strings Equal	Medium	String, Bit_Manipulation	246	100.00
2545	Sort the Students by Their Kth Score	Medium	Array, Sorting, Matrix	442	100.00
2544	Alternating Digit Sum	Easy	Math	122	60.00
2543	Check if Point Is Reachable	Hard	Math, Number_Theory	134	100.00
2542	Maximum Subsequence Score	Medium	Array, Sorting, Greedy, Heap_Priority_Queue	780	81.97
2541	Minimum Operations to Make Array Equal II	Medium	Array, Math, Greedy	521	100.00
2540	Minimum Common Value	Easy	Array, Hash_Table, Binary_Search, Two_Pointers	412	100.00
2538	Difference Between Maximum and Minimum Price Sum	Hard	Array, Dynamic_Programming, Depth_First_Search, Tree	1054	100.00
2537	Count the Number of Good Subarrays	Medium	Array, Hash_Table, Sliding_Window	553	100.00
2536	Increment Submatrices by One	Medium	Array, Matrix, Prefix_Sum	827	100.00
2535	Difference Between Element Sum and Digit Sum of an Array	Easy	Array, Math	231	66.67
2532	Time to Cross a Bridge	Hard	Array, Heap_Priority_Queue, Simulation	420	100.00
2531	Make Number of Distinct Characters Equal	Medium	String, Hash_Table, Counting	287	100.00
2530	Maximal Score After Applying K Operations	Medium	Array, Greedy, Heap_Priority_Queue	726	100.00
2529	Maximum Count of Positive Integer and Negative Integer	Easy	Array, Binary_Search, Counting	215	83.33
2528	Maximize the Minimum Powered City	Hard	Array, Greedy, Binary_Search, Prefix_Sum, Sliding_Window, Queue	496	100.00
2527	Find Xor-Beauty of Array	Medium	Array, Math, Bit_Manipulation	434	100.00
2526	Find Consecutive Integers from a Data Stream	Medium	Hash_Table, Design, Counting, Queue, Data_Stream	867	100.00
2525	Categorize Box According to Criteria	Easy	Math	119	100.00
2523	Closest Prime Numbers in Range	Medium	Math, Number_Theory	136	100.00
2522	Partition String Into Substrings With Values at Most K	Medium	String, Dynamic_Programming, Greedy	174	100.00
2521	Distinct Prime Factors of Product of Array	Medium	Array, Hash_Table, Math, Number_Theory	229	100.00
2520	Count the Digits That Divide a Number	Easy	Math	121	80.95
2518	Number of Great Partitions	Hard	Array, Dynamic_Programming	164	100.00
2517	Maximum Tastiness of Candy Basket	Medium	Array, Sorting, Binary_Search	547	33.33
2516	Take K of Each Character From Left and Right	Medium	String, Hash_Table, Sliding_Window	189	100.00
2515	Shortest Distance to Target String in a Circular Array	Easy	Array, String	209	100.00
2514	Count Anagrams	Hard	String, Hash_Table, Math, Counting, Combinatorics	236	100.00
2513	Minimize the Maximum of Two Arrays	Medium	Math, Binary_Search, Number_Theory	135	100.00
2512	Reward Top K Students	Medium	Array, String, Hash_Table, Sorting, Heap_Priority_Queue	691	100.00
2511	Maximum Enemy Forts That Can Be Captured	Easy	Array, Two_Pointers	142	100.00
2509	Cycle Length Queries in a Tree	Hard	Tree, Binary_Tree	825	75.00
2508	Add Edges to Make Degrees of All Nodes Even	Hard	Hash_Table, Graph	1045	100.00
2507	Smallest Value After Replacing With Sum of Prime Factors	Medium	Math, Number_Theory	149	100.00
2506	Count Pairs Of Similar Strings	Easy	Array, String, Hash_Table	208	100.00
2503	Maximum Number of Points From Grid Queries	Hard	Array, Sorting, Breadth_First_Search, Heap_Priority_Queue, Union_Find	581	100.00
2502	Design Memory Allocator	Medium	Array, Hash_Table, Design, Simulation	284	100.00
2501	Longest Square Streak in an Array	Medium	Array, Hash_Table, Dynamic_Programming, Sorting, Binary_Search	585	100.00
2500	Delete Greatest Value in Each Row	Easy	Array, Sorting, Matrix	204	80.00
2499	Minimum Total Cost to Make Arrays Unequal	Hard	Array, Hash_Table, Greedy, Counting	628	100.00
2498	Frog Jump II	Medium	Array, Greedy, Binary_Search	482	100.00
2497	Maximum Star Sum of a Graph	Medium	Array, Sorting, Greedy, Heap_Priority_Queue, Graph	773	100.00
2496	Maximum Value of a String in an Array	Easy	Array, String	138	100.00
2493	Divide Nodes Into the Maximum Number of Groups	Hard	Breadth_First_Search, Graph, Union_Find	862	100.00
2492	Minimum Score of a Path Between Two Cities	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	929	91.67
2491	Divide Players Into Teams of Equal Skill	Medium	Array, Hash_Table, Sorting, Two_Pointers	459	100.00
2490	Circular Sentence	Easy	String	152	100.00
2488	Count Subarrays With Median K	Hard	Array, Hash_Table, Prefix_Sum	464	100.00
2487	Remove Nodes From Linked List	Medium	Stack, Linked_List, Monotonic_Stack, Recursion	770	50.00
2486	Append Characters to String to Make Subsequence	Medium	String, Greedy, Two_Pointers	196	100.00
2485	Find the Pivot Integer	Easy	Math, Prefix_Sum	134	100.00
2484	Count Palindromic Subsequences	Hard	String, Dynamic_Programming	494	100.00
2483	Minimum Penalty for a Shop	Medium	String, Prefix_Sum	210	66.67
2482	Difference Between Ones and Zeros in Row and Column	Medium	Array, Matrix, Simulation	1061	100.00
2481	Minimum Cuts to Divide a Circle	Easy	Math, Geometry	128	50.00
2478	Number of Beautiful Partitions	Hard	String, Dynamic_Programming	230	100.00
2477	Minimum Fuel Cost to Report to the Capital	Medium	Depth_First_Search, Breadth_First_Search, Tree, Graph	969	100.00
2476	Closest Nodes Queries in a Binary Search Tree	Medium	Array, Depth_First_Search, Tree, Binary_Search, Binary_Tree	1404	33.33
2475	Number of Unequal Triplets in Array	Easy	Array, Hash_Table	143	100.00
2472	Maximum Number of Non-overlapping Palindrome Substrings	Hard	String, Dynamic_Programming	183	100.00
2471	Minimum Number of Operations to Sort a Binary Tree by Level	Medium	Breadth_First_Search, Tree, Binary_Tree	789	100.00
2470	Number of Subarrays With LCM Equal to K	Medium	Array, Math, Number_Theory	232	100.00
2469	Convert the Temperature	Easy	Math	130	100.00
2468	Split Message Based on Limit	Hard	String, Binary_Search	427	100.00
2467	Most Profitable Path in a Tree	Medium	Array, Depth_First_Search, Breadth_First_Search, Tree, Graph	850	100.00
2466	Count Ways To Build Good Strings	Medium	Dynamic_Programming	150	75.00
2465	Number of Distinct Averages	Easy	Array, Hash_Table, Sorting, Two_Pointers	141	89.47
2463	Minimum Total Distance Traveled	Hard	Array, Dynamic_Programming, Sorting	153	100.00
2462	Total Cost to Hire K Workers	Medium	Array, Two_Pointers, Heap_Priority_Queue, Simulation	588	81.43
2461	Maximum Sum of Distinct Subarrays With Length K	Medium	Array, Hash_Table, Sliding_Window	638	62.50
2460	Apply Operations to an Array	Easy	Array, Simulation	165	100.00
2458	Height of Binary Tree After Subtree Removal Queries	Hard	Array, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	951	80.00
2457	Minimum Addition to Make Integer Beautiful	Medium	Math, Greedy	132	66.67
2456	Most Popular Video Creator	Medium	Array, String, Hash_Table, Sorting, Heap_Priority_Queue	1162	100.00
2455	Average Value of Even Numbers That Are Divisible by Three	Easy	Array, Math	196	80.00
2454	Next Greater Element IV	Hard	Array, Sorting, Binary_Search, Stack, Heap_Priority_Queue, Monotonic_Stack	749	100.00
2453	Destroy Sequential Targets	Medium	Array, Hash_Table, Counting	681	100.00
2452	Words Within Two Edits of Dictionary	Medium	Array, String	256	100.00
2451	Odd String Difference	Easy	String, Hash_Table, Math	141	100.00
2449	Minimum Number of Operations to Make Arrays Similar	Hard	Array, Sorting, Greedy	791	100.00
2448	Minimum Cost to Make Array Equal	Hard	Array, Sorting, Binary_Search, Prefix_Sum	387	80.40
2447	Number of Subarrays With GCD Equal to K	Medium	Array, Math, Number_Theory	180	100.00
2446	Determine if Two Events Have Conflict	Easy	Array, String	140	87.50
2444	Count Subarrays With Fixed Bounds	Hard	Array, Sliding_Window, Queue, Monotonic_Queue	469	100.00
2443	Sum of Number and Its Reverse	Medium	Math, Enumeration	216	100.00
2442	Count Number of Distinct Integers After Reverse Operations	Medium	Array, Hash_Table, Math	652	83.33
2441	Largest Positive Integer That Exists With Its Negative	Easy	Array, Hash_Table	266	66.67
2440	Create Components With Same Value	Hard	Array, Math, Depth_First_Search, Tree, Enumeration	751	100.00
2439	Minimize Maximum of Array	Medium	Array, Dynamic_Programming, Greedy, Binary_Search, Prefix_Sum	508	100.00
2438	Range Product Queries of Powers	Medium	Array, Bit_Manipulation, Prefix_Sum	1115	100.00
2437	Number of Valid Clock Times	Easy	String, Enumeration	133	64.29
2435	Paths in Matrix Whose Sum Is Divisible by K	Hard	Array, Dynamic_Programming, Matrix	752	100.00
2434	Using a Robot to Print the Lexicographically Smallest String	Medium	String, Hash_Table, Greedy, Stack	319	100.00
2433	Find The Original Array of Prefix Xor	Medium	Array, Bit_Manipulation	618	80.00
2432	The Employee That Worked on the Longest Task	Easy	Array	250	100.00
2430	Maximum Deletions on a String	Hard	String, Dynamic_Programming, Hash_Function, String_Matching, Rolling_Hash	280	100.00
2429	Minimize XOR	Medium	Greedy, Bit_Manipulation	117	100.00
2428	Maximum Sum of an Hourglass	Medium	Array, Matrix, Prefix_Sum	274	50.00
2427	Number of Common Factors	Easy	Math, Enumeration, Number_Theory	127	100.00
2426	Number of Pairs Satisfying Inequality	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	490	100.00
2425	Bitwise XOR of All Pairings	Medium	Array, Bit_Manipulation, Brainteaser	424	100.00
2424	Longest Uploaded Prefix	Medium	Binary_Search, Design, Heap_Priority_Queue, Union_Find, Ordered_Set, Segment_Tree, Binary_Indexed_Tree	897	100.00
2423	Remove Letter To Equalize Frequency	Easy	String, Hash_Table, Counting	135	100.00
2421	Number of Good Paths	Hard	Array, Tree, Graph, Union_Find	909	100.00
2420	Find All Good Indices	Medium	Array, Dynamic_Programming, Prefix_Sum	621	100.00
2419	Longest Subarray With Maximum Bitwise AND	Medium	Array, Bit_Manipulation, Brainteaser	487	100.00
2418	Sort the People	Easy	Array, String, Hash_Table, Sorting	248	100.00
2416	Sum of Prefix Scores of Strings	Hard	Array, String, Counting, Trie	2062	50.00
2415	Reverse Odd Levels of Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	499	87.50
2414	Length of the Longest Alphabetical Continuous Substring	Medium	String	235	100.00
2413	Smallest Even Multiple	Easy	Math, Number_Theory	121	85.71
2412	Minimum Money Required Before Transactions	Hard	Array, Sorting, Greedy	965	100.00
2411	Smallest Subarrays With Maximum Bitwise OR	Medium	Array, Binary_Search, Bit_Manipulation, Sliding_Window	562	100.00
2410	Maximum Matching of Players With Trainers	Medium	Array, Sorting, Greedy, Two_Pointers	565	83.33
2409	Count Days Spent Together	Easy	String, Math	143	60.00
2407	Longest Increasing Subsequence II	Hard	Array, Dynamic_Programming, Divide_and_Conquer, Queue, Segment_Tree, Binary_Indexed_Tree, Monotonic_Queue	518	100.00
2406	Divide Intervals Into Minimum Number of Groups	Medium	Array, Sorting, Greedy, Two_Pointers, Heap_Priority_Queue, Prefix_Sum	772	100.00
2405	Optimal Partition of String	Medium	String, Hash_Table, Greedy	185	100.00
2404	Most Frequent Even Element	Easy	Array, Hash_Table, Counting	349	90.91
2402	Meeting Rooms III	Hard	Array, Sorting, Heap_Priority_Queue	976	100.00
2401	Longest Nice Subarray	Medium	Array, Bit_Manipulation, Sliding_Window	507	100.00
2400	Number of Ways to Reach a Position After Exactly k Steps	Medium	Dynamic_Programming, Math, Combinatorics	126	100.00
2399	Check Distances Between Same Letters	Easy	Array, String, Hash_Table	173	66.67
2398	Maximum Number of Robots Within Budget	Hard	Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue	507	100.00
2397	Maximum Rows Covered by Columns	Medium	Array, Matrix, Bit_Manipulation, Backtracking, Enumeration	154	100.00
2396	Strictly Palindromic Number	Medium	Math, Two_Pointers, Brainteaser	130	58.06
2395	Find Subarrays With Equal Sum	Easy	Array, Hash_Table	143	100.00
2392	Build a Matrix With Conditions	Hard	Array, Matrix, Graph, Topological_Sort	706	100.00
2391	Minimum Amount of Time to Collect Garbage	Medium	Array, String, Prefix_Sum	537	100.00
2390	Removing Stars From a String	Medium	String, Stack, Simulation	337	62.92
2389	Longest Subsequence With Limited Sum	Easy	Array, Sorting, Greedy, Binary_Search, Prefix_Sum	257	80.00
2386	Find the K-Sum of an Array	Hard	Array, Sorting, Heap_Priority_Queue	675	100.00
2385	Amount of Time for Binary Tree to Be Infected	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	609	100.00
2384	Largest Palindromic Number	Medium	String, Hash_Table, Greedy	252	100.00
2383	Minimum Hours of Training to Win a Competition	Easy	Array, Greedy	156	100.00
2382	Maximum Segment Sum After Removals	Hard	Array, Prefix_Sum, Union_Find, Ordered_Set	857	50.00
2381	Shifting Letters II	Medium	Array, String, Prefix_Sum	669	100.00
2380	Time Needed to Rearrange a Binary String	Medium	String, Dynamic_Programming, Simulation	149	100.00
2379	Minimum Recolors to Get K Consecutive Black Blocks	Easy	String, Sliding_Window	132	95.24
2376	Count Special Integers	Hard	Dynamic_Programming, Math	125	100.00
2375	Construct Smallest Number From DI String	Medium	String, Greedy, Stack, Backtracking	156	66.67
2374	Node With Highest Edge Score	Medium	Hash_Table, Graph	673	100.00
2373	Largest Local Values in a Matrix	Easy	Array, Matrix	264	100.00
2370	Longest Ideal Subsequence	Medium	String, Hash_Table, Dynamic_Programming	255	100.00
2369	Check if There is a Valid Partition For The Array	Medium	Array, Dynamic_Programming	533	100.00
2368	Reachable Nodes With Restrictions	Medium	Array, Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Graph	1199	76.92
2367	Number of Arithmetic Triplets	Easy	Array, Hash_Table, Two_Pointers, Enumeration	146	91.18
2366	Minimum Replacements to Sort the Array	Hard	Array, Math, Greedy	433	100.00
2365	Task Scheduler II	Medium	Array, Hash_Table, Simulation	595	100.00
2364	Count Number of Bad Pairs	Medium	Array, Hash_Table	590	100.00
2363	Merge Similar Items	Easy	Array, Hash_Table, Sorting, Ordered_Set	320	100.00
2360	Longest Cycle in a Graph	Hard	Depth_First_Search, Graph, Topological_Sort	517	80.00
2359	Find Closest Node to Given Two Nodes	Medium	Depth_First_Search, Graph	552	40.00
2358	Maximum Number of Groups Entering a Competition	Medium	Array, Math, Greedy, Binary_Search	441	100.00
2357	Make Array Zero by Subtracting Equal Amounts	Easy	Array, Hash_Table, Sorting, Heap_Priority_Queue, Simulation	156	78.95
2356	Number of Unique Subjects Taught by Each Teacher	Easy	Database	839	96.77
2354	Number of Excellent Pairs	Hard	Array, Hash_Table, Binary_Search, Bit_Manipulation	700	100.00
2353	Design a Food Rating System	Medium	Hash_Table, Design, Heap_Priority_Queue, Ordered_Set	1204	100.00
2352	Equal Row and Column Pairs	Medium	Array, Hash_Table, Matrix, Simulation	339	100.00
2351	First Letter to Appear Twice	Easy	String, Hash_Table, Counting	122	100.00
2350	Shortest Impossible Sequence of Rolls	Hard	Array, Hash_Table, Greedy	495	100.00
2349	Design a Number Container System	Medium	Hash_Table, Design, Heap_Priority_Queue, Ordered_Set	1011	100.00
2348	Number of Zero-Filled Subarrays	Medium	Array, Math	559	80.00
2347	Best Poker Hand	Easy	Array, Hash_Table, Counting	146	33.33
2344	Minimum Deletions to Make Array Divisible	Hard	Array, Math, Sorting, Heap_Priority_Queue, Number_Theory	542	100.00
2343	Query Kth Smallest Trimmed Number	Medium	Array, String, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Radix_Sort	382	100.00
2342	Max Sum of a Pair With Equal Sum of Digits	Medium	Array, Hash_Table, Sorting, Heap_Priority_Queue	636	83.33
2341	Maximum Number of Pairs in Array	Easy	Array, Hash_Table, Sorting	160	100.00
2338	Count the Number of Ideal Arrays	Hard	Dynamic_Programming, Math, Number_Theory, Combinatorics	201	100.00
2337	Move Pieces to Obtain a String	Medium	String, Two_Pointers	261	100.00
2336	Smallest Number in Infinite Set	Medium	Hash_Table, Design, Heap_Priority_Queue	308	95.45
2335	Minimum Amount of Time to Fill Cups	Easy	Array, Greedy, Heap_Priority_Queue	140	100.00
2334	Subarray With Elements Greater Than Varying Threshold	Hard	Array, Stack, Union_Find, Monotonic_Stack	889	100.00
2333	Minimum Sum of Squared Difference	Medium	Array, Math, Sorting, Heap_Priority_Queue	502	100.00
2332	The Latest Time to Catch a Bus	Medium	Array, Sorting, Binary_Search, Two_Pointers	522	75.00
2331	Evaluate Boolean Binary Tree	Easy	Depth_First_Search, Tree, Binary_Search	199	91.67
2328	Number of Increasing Paths in a Grid	Hard	Array, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Matrix, Graph, Memoization, Topological_Sort	689	79.53
2327	Number of People Aware of a Secret	Medium	Dynamic_Programming, Simulation, Queue	121	100.00
2326	Spiral Matrix IV	Medium	Array, Matrix, Simulation, Linked_List	908	66.67
2325	Decode the Message	Easy	String, Hash_Table	169	96.88
2322	Minimum Score After Removals on a Tree	Hard	Array, Depth_First_Search, Tree, Bit_Manipulation	412	100.00
2321	Maximum Score Of Spliced Array	Hard	Array, Dynamic_Programming	497	50.00
2320	Count Number of Ways to Place Houses	Medium	Dynamic_Programming	122	100.00
2319	Check if Matrix Is X-Matrix	Easy	Array, Matrix	247	100.00
2318	Number of Distinct Roll Sequences	Hard	Dynamic_Programming, Memoization	441	100.00
2317	Maximum XOR After Operations	Medium	Array, Math, Bit_Manipulation	373	100.00
2316	Count Unreachable Pairs of Nodes in an Undirected Graph	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	981	87.50
2315	Count Asterisks	Easy	String	137	94.44
2312	Selling Pieces of Wood	Hard	Backtracking	396	100.00
2311	Longest Binary Subsequence Less Than or Equal to K	Medium	String, Dynamic_Programming, Greedy, Memoization	140	100.00
2310	Sum of Numbers With Units Digit K	Medium	Math	133	100.00
2309	Greatest English Letter in Upper and Lower Case	Easy	Array	154	87.50
2306	Naming a Company	Hard	Array, String, Hash_Table, Bit_Manipulation, Enumeration	590	100.00
2305	Fair Distribution of Cookies	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	255	100.00
2304	Minimum Path Cost in a Grid	Medium	Array, Dynamic_Programming, Matrix	1048	100.00
2303	Calculate Amount Paid in Taxes	Easy	Array, Simulation	213	100.00
2302	Count Subarrays With Score Less Than K	Hard	Array, Binary_Search, Prefix_Sum, Sliding_Window	556	100.00
2301	Match Substring After Replacement	Hard	Array, String, Hash_Table, String_Matching	343	100.00
2300	Successful Pairs of Spells and Potions	Medium	Array, Sorting, Binary_Search, Two_Pointers	818	72.22
2299	Strong Password Checker II	Easy	String	139	100.00
2296	Design a Text Editor	Hard	String, Stack, Design, Simulation, Linked_List, Doubly_Linked_List	1268	100.00
2295	Replace Elements in an Array	Medium	Array, Hash_Table, Simulation	913	100.00
2294	Partition Array Such That Maximum Difference Is K	Medium	Array, Sorting, Greedy	747	33.33
2293	Min Max Game	Easy	Array, Simulation	183	100.00
2290	Minimum Obstacle Removal to Reach Corner	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path	765	100.00
2289	Steps to Make Array Non-decreasing	Medium	Array, Stack, Linked_List, Monotonic_Stack	509	50.00
2288	Apply Discount to Prices	Medium	String	465	100.00
2287	Rearrange Characters to Make Target String	Easy	String, Hash_Table, Counting	122	100.00
2286	Booking Concert Tickets in Groups	Hard	Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree	1292	100.00
2285	Maximum Total Importance of Roads	Medium	Sorting, Greedy, Heap_Priority_Queue, Graph	947	100.00
2284	Sender With Largest Word Count	Medium	Array, String, Hash_Table, Counting	672	100.00
2283	Check if Number Has Equal Digit Count and Digit Value	Easy	String, Hash_Table, Counting	136	100.00
2281	Sum of Total Strength of Wizards	Hard	Array, Stack, Prefix_Sum, Monotonic_Stack	673	100.00
2280	Minimum Lines to Represent a Line Chart	Medium	Array, Math, Sorting, Geometry, Number_Theory	765	100.00
2279	Maximum Bags With Full Capacity of Rocks	Medium	Array, Sorting, Greedy	551	80.00
2278	Percentage of Letter in String	Easy	String	122	100.00
2276	Count Integers in Intervals	Hard	Design, Ordered_Set, Segment_Tree	1256	100.00
2275	Largest Combination With Bitwise AND Greater Than Zero	Medium	Array, Hash_Table, Bit_Manipulation, Counting	426	100.00
2274	Maximum Consecutive Floors Without Special Floors	Medium	Array, Sorting	532	100.00
2273	Find Resultant Array After Removing Anagrams	Easy	Array, String, Hash_Table, Sorting	200	93.75
2272	Substring With Largest Variance	Hard	Array, Dynamic_Programming	338	100.00
2271	Maximum White Tiles Covered by a Carpet	Medium	Array, Sorting, Greedy, Binary_Search, Prefix_Sum	692	100.00
2270	Number of Ways to Split Array	Medium	Array, Prefix_Sum	627	36.36
2269	Find the K-Beauty of a Number	Easy	String, Math, Sliding_Window	123	100.00
2267	Check if There Is a Valid Parentheses String Path	Hard	Array, Dynamic_Programming, Matrix	408	100.00
2266	Count Number of Texts	Medium	String, Hash_Table, Dynamic_Programming, Math	216	100.00
2265	Count Nodes Equal to Average of Subtree	Medium	Depth_First_Search, Tree, Binary_Tree	174	100.00
2264	Largest 3-Same-Digit Number in String	Easy	String	145	100.00
2262	Total Appeal of A String	Hard	String, Hash_Table, Dynamic_Programming	202	100.00
2261	K Divisible Elements Subarrays	Medium	Array, Hash_Table, Trie, Enumeration, Hash_Function, Rolling_Hash	263	100.00
2260	Minimum Consecutive Cards to Pick Up	Medium	Array, Hash_Table, Sliding_Window	646	33.33
2259	Remove Digit From Number to Maximize Result	Easy	String, Greedy, Enumeration	137	100.00
2258	Escape the Spreading Fire	Hard	Array, Breadth_First_Search, Binary_Search, Matrix	304	100.00
2257	Count Unguarded Cells in the Grid	Medium	Array, Matrix, Simulation	901	100.00
2256	Minimum Average Difference	Medium	Array, Prefix_Sum	527	100.00
2255	Count Prefixes of a Given String	Easy	Array, String	162	100.00
2251	Number of Flowers in Full Bloom	Hard	Array, Hash_Table, Sorting, Binary_Search, Prefix_Sum, Ordered_Set	973	100.00
2250	Count Number of Rectangles Containing Each Point	Medium	Array, Sorting, Binary_Search, Binary_Indexed_Tree	967	100.00
2249	Count Lattice Points Inside a Circle	Medium	Array, Hash_Table, Math, Enumeration, Geometry	204	100.00
2248	Intersection of Multiple Arrays	Easy	Array, Hash_Table, Counting	197	100.00
2246	Longest Path With Different Adjacent Characters	Hard	Array, String, Depth_First_Search, Tree, Graph, Topological_Sort	828	100.00
2245	Maximum Trailing Zeros in a Cornered Path	Medium	Array, Matrix, Prefix_Sum	888	100.00
2244	Minimum Rounds to Complete All Tasks	Medium	Array, Hash_Table, Greedy, Counting	584	73.68
2243	Calculate Digit Sum of a String	Easy	String, Simulation	141	100.00
2242	Maximum Score of a Node Sequence	Hard	Array, Sorting, Graph, Enumeration	844	100.00
2241	Design an ATM Machine	Medium	Array, Greedy, Design	764	100.00
2240	Number of Ways to Buy Pens and Pencils	Medium	Math, Enumeration	143	100.00
2239	Find Closest Number to Zero	Easy	Array	245	66.67
2236	Root Equals Sum of Children	Easy	Tree, Binary_Tree	141	86.73
2235	Add Two Integers	Easy	Math	131	65.81
2234	Maximum Total Beauty of the Gardens	Hard	Array, Sorting, Greedy, Binary_Search, Two_Pointers	699	100.00
2233	Maximum Product After K Increments	Medium	Array, Greedy, Heap_Priority_Queue	766	100.00
2232	Minimize Result by Adding Parentheses to Expression	Medium	String, Enumeration	191	100.00
2231	Largest Number After Digit Swaps by Parity	Easy	Sorting, Heap_Priority_Queue	124	100.00
2227	Encrypt and Decrypt Strings	Hard	Array, String, Hash_Table, Design, Trie	483	75.00
2226	Maximum Candies Allocated to K Children	Medium	Array, Binary_Search	544	66.67
2225	Find Players With Zero or One Losses	Medium	Array, Hash_Table, Sorting, Counting	1323	65.79
2224	Minimum Number of Operations to Convert Time	Easy	String, Greedy	155	66.67
2223	Sum of Scores of Built Strings	Hard	String, Binary_Search, Hash_Function, String_Matching, Rolling_Hash, Suffix_Array	264	100.00
2222	Number of Ways to Select Buildings	Medium	String, Dynamic_Programming, Prefix_Sum	261	100.00
2221	Find Triangular Sum of an Array	Medium	Array, Math, Simulation, Combinatorics	257	100.00
2220	Minimum Bit Flips to Convert Number	Easy	Bit_Manipulation	131	70.59
2218	Maximum Value of K Coins From Piles	Hard	Array, Dynamic_Programming, Prefix_Sum	313	100.00
2217	Find Palindrome With Fixed Length	Medium	Array, Math	541	100.00
2216	Minimum Deletions to Make Array Beautiful	Medium	Array, Greedy, Stack	567	66.67
2215	Find the Difference of Two Arrays	Easy	Array, Hash_Table	352	98.63
2213	Longest Substring of One Repeating Character	Hard	Array, String, Ordered_Set, Segment_Tree	879	100.00
2212	Maximum Points in an Archery Competition	Medium	Array, Bit_Manipulation, Recursion, Enumeration	210	100.00
2211	Count Collisions on a Road	Medium	String, Stack	325	100.00
2210	Count Hills and Valleys in an Array	Easy	Array	153	80.00
2209	Minimum White Tiles After Covering With Carpets	Hard	String, Dynamic_Programming, Prefix_Sum	373	100.00
2208	Minimum Operations to Halve Array Sum	Medium	Array, Greedy, Heap_Priority_Queue	628	33.33
2207	Maximize Number of Subsequences in a String	Medium	String, Greedy, Prefix_Sum	295	100.00
2206	Divide Array Into Equal Pairs	Easy	Array, Hash_Table, Bit_Manipulation, Counting	221	71.43
2203	Minimum Weighted Subgraph With the Required Paths	Hard	Graph, Shortest_Path	1126	100.00
2202	Maximize the Topmost Element After K Moves	Medium	Array, Greedy	491	50.00
2201	Count Artifacts That Can Be Extracted	Medium	Array, Hash_Table, Simulation	1011	100.00
2200	Find All K-Distant Indices in an Array	Easy	Array	200	100.00
2197	Replace Non-Coprime Numbers in Array	Hard	Array, Math, Stack, Number_Theory	917	100.00
2196	Create Binary Tree From Descriptions	Medium	Array, Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	933	100.00
2195	Append K Integers With Minimal Sum	Medium	Array, Math, Sorting, Greedy	542	100.00
2194	Cells in a Range on an Excel Sheet	Easy	String	176	100.00
2193	Minimum Number of Moves to Make Palindrome	Hard	String, Greedy, Two_Pointers, Binary_Indexed_Tree	176	100.00
2192	All Ancestors of a Node in a Directed Acyclic Graph	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	841	100.00
2191	Sort the Jumbled Numbers	Medium	Array, Sorting	821	100.00
2190	Most Frequent Number Following Key In an Array	Easy	Array, Hash_Table, Counting	188	100.00
2188	Minimum Time to Finish the Race	Hard	Array, Dynamic_Programming	1220	100.00
2187	Minimum Time to Complete Trips	Medium	Array, Binary_Search	660	90.91
2186	Minimum Number of Steps to Make Two Strings Anagram II	Medium	String, Hash_Table, Counting	304	100.00
2185	Counting Words With a Given Prefix	Easy	Array, String	172	100.00
2183	Count Array Pairs Divisible by K	Hard	Array, Math, Number_Theory	756	100.00
2182	Construct String With Repeat Limit	Medium	String, Greedy, Heap_Priority_Queue, Counting	311	100.00
2181	Merge Nodes in Between Zeros	Medium	Simulation, Linked_List	794	100.00
2180	Count Integers With Even Digit Sum	Easy	Math, Simulation	126	100.00
2179	Count Good Triplets in an Array	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	563	100.00
2178	Maximum Split of Positive Even Integers	Medium	Math, Greedy	486	55.56
2177	Find Three Consecutive Integers That Sum to a Given Number	Medium	Math, Simulation	160	100.00
2176	Count Equal and Divisible Pairs in an Array	Easy	Array	179	69.23
2172	Maximum AND Sum of Array	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	165	100.00
2171	Removing Minimum Number of Magic Beans	Medium	Array, Sorting, Prefix_Sum	728	100.00
2170	Minimum Operations to Make the Array Alternating	Medium	Array, Hash_Table, Greedy, Counting	531	100.00
2169	Count Operations to Obtain Zero	Easy	Math, Simulation	127	77.78
2167	Minimum Time to Remove All Cars Containing Illegal Goods	Hard	String, Dynamic_Programming	312	100.00
2166	Design Bitset	Medium	Array, Hash_Table, Design	1036	100.00
2165	Smallest Value of the Rearranged Number	Medium	Math, Sorting	129	100.00
2164	Sort Even and Odd Indices Independently	Easy	Array, Sorting	200	100.00
2163	Minimum Difference in Sums After Removal of Elements	Hard	Array, Dynamic_Programming, Heap_Priority_Queue	854	100.00
2162	Minimum Cost to Set Cooking Time	Medium	Math, Enumeration	134	100.00
2161	Partition Array According to Given Pivot	Medium	Array, Two_Pointers, Simulation	859	46.15
2160	Minimum Sum of Four Digit Number After Splitting Digits	Easy	Math, Sorting, Greedy	133	88.24
2157	Groups of Strings	Hard	String, Bit_Manipulation, Union_Find	930	100.00
2156	Find Substring With Given Hash Value	Hard	String, Sliding_Window, Hash_Function, Rolling_Hash	248	100.00
2155	All Divisions With the Highest Score of a Binary Array	Medium	Array	1171	100.00
2154	Keep Multiplying Found Values by Two	Easy	Array, Hash_Table, Sorting, Simulation	183	85.71
2151	Maximum Good People Based on Statements	Hard	Array, Bit_Manipulation, Backtracking, Enumeration	308	100.00
2150	Find All Lonely Numbers in the Array	Medium	Array, Hash_Table, Counting	1045	50.00
2149	Rearrange Array Elements by Sign	Medium	Array, Two_Pointers, Simulation	873	42.86
2148	Count Elements With Strictly Smaller and Greater Elements	Easy	Array, Sorting	148	83.33
2147	Number of Ways to Divide a Long Corridor	Hard	String, Dynamic_Programming, Math	361	100.00
2146	K Highest Ranked Items Within a Price Range	Medium	Array, Sorting, Breadth_First_Search, Matrix, Heap_Priority_Queue	1373	100.00
2145	Count the Hidden Sequences	Medium	Array, Prefix_Sum	641	100.00
2144	Minimum Cost of Buying Candies With Discount	Easy	Array, Sorting, Greedy	169	75.00
2141	Maximum Running Time of N Computers	Hard	Array, Sorting, Greedy	ch	ch
2140	Solving Questions With Brainpower	Medium	Array, Dynamic_Programming	753	66.97
2139	Minimum Moves to Reach Target Score	Medium	Math, Greedy	123	100.00
2138	Divide a String Into Groups of Size k	Easy	String, Simulation	173	75.00
2136	Earliest Possible Day of Full Bloom	Hard	Array, Sorting, Greedy	968	100.00
2135	Count Words Obtained After Adding a Letter	Medium	Array, String, Hash_Table, Sorting, Bit_Manipulation	556	100.00
2134	Minimum Swaps to Group All 1’s Together II	Medium	Array, Sliding_Window	465	33.33
2133	Check if Every Row and Column Contains All Numbers	Easy	Array, Hash_Table, Matrix	404	100.00
2132	Stamping the Grid	Hard	Array, Greedy, Matrix, Prefix_Sum	1158	100.00
2131	Longest Palindrome by Concatenating Two Letter Words	Medium	Array, String, Hash_Table, Greedy, Counting, Level_2_Day_5_Greedy	607	90.00
2130	Maximum Twin Sum of a Linked List	Medium	Two_Pointers, Stack, Linked_List	458	93.88
2129	Capitalize the Title	Easy	String	140	100.00
2127	Maximum Employees to Be Invited to a Meeting	Hard	Depth_First_Search, Graph, Topological_Sort	572	100.00
2126	Destroying Asteroids	Medium	Array, Sorting, Greedy	560	100.00
2125	Number of Laser Beams in a Bank	Medium	Array, String, Math, Matrix	297	100.00
2124	Check if All A’s Appears Before All B’s	Easy	String	136	87.50
2122	Recover the Original Array	Hard	Array, Hash_Table, Sorting, Enumeration	299	100.00
2121	Intervals Between Identical Elements	Medium	Array, Hash_Table, Prefix_Sum	1022	100.00
2120	Execution of All Suffix Instructions Staying in a Grid	Medium	String, Simulation	215	100.00
2119	A Number After a Double Reversal	Easy	Math	127	89.47
2117	Abbreviating the Product of a Range	Hard	Math	232	100.00
2116	Check if a Parentheses String Can Be Valid	Medium	String, Greedy, Stack	315	42.86
2115	Find All Possible Recipes from Given Supplies	Medium	Array, String, Hash_Table, Graph, Topological_Sort	514	100.00
2114	Maximum Number of Words Found in Sentences	Easy	Array, String	183	88.64
2111	Minimum Operations to Make the Array K-Increasing	Hard	Array, Binary_Search	558	100.00
2110	Number of Smooth Descent Periods of a Stock	Medium	Array, Dynamic_Programming, Math	582	100.00
2109	Adding Spaces to a String	Medium	Array, String, Simulation	624	100.00
2108	Find First Palindromic String in the Array	Easy	Array, String, Two_Pointers	242	100.00
2106	Maximum Fruits Harvested After at Most K Steps	Hard	Array, Binary_Search, Prefix_Sum, Sliding_Window	816	100.00
2105	Watering Plants II	Medium	Array, Two_Pointers, Simulation	531	50.00
2104	Sum of Subarray Ranges	Medium	Array, Stack, Monotonic_Stack	212	100.00
2103	Rings and Rods	Easy	String, Hash_Table	131	89.47
2102	Sequentially Ordinal Rank Tracker	Hard	Design, Heap_Priority_Queue, Ordered_Set, Data_Stream	1208	100.00
2101	Detonate the Maximum Bombs	Medium	Array, Math, Depth_First_Search, Breadth_First_Search, Graph, Geometry	262	98.96
2100	Find Good Days to Rob the Bank	Medium	Array, Dynamic_Programming, Prefix_Sum	695	100.00
2099	Find Subsequence of Length K With the Largest Sum	Easy	Array, Hash_Table, Sorting, Heap_Priority_Queue	203	100.00
2097	Valid Arrangement of Pairs	Hard	Depth_First_Search, Graph, Eulerian_Circuit	2120	100.00
2096	Step-By-Step Directions From a Binary Tree Node to Another	Medium	String, Depth_First_Search, Tree, Binary_Tree	690	93.33
2095	Delete the Middle Node of a Linked List	Medium	Two_Pointers, Linked_List	1115	50.00
2094	Finding 3-Digit Even Numbers	Easy	Array, Hash_Table, Sorting, Enumeration	181	100.00
2092	Find All People With Secret	Hard	Sorting, Depth_First_Search, Breadth_First_Search, Graph, Union_Find	1086	100.00
2091	Removing Minimum and Maximum From Array	Medium	Array, Greedy	607	100.00
2090	K Radius Subarray Averages	Medium	Array, Sliding_Window	874	85.63
2089	Find Target Indices After Sorting Array	Easy	Array, Sorting, Binary_Search	180	90.48
2088	Count Fertile Pyramids in a Land	Hard	Array, Dynamic_Programming, Matrix	489	100.00
2087	Minimum Cost Homecoming of a Robot in a Grid	Medium	Array, Greedy, Matrix	672	100.00
2086	Minimum Number of Buckets Required to Collect Rainwater from Houses	Medium	String, Dynamic_Programming, Greedy	208	100.00
2085	Count Common Words With One Occurrence	Easy	Array, String, Hash_Table, Counting	192	100.00
2081	Sum of k-Mirror Numbers	Hard	Math, Enumeration	455	100.00
2080	Range Frequency Queries	Medium	Array, Hash_Table, Binary_Search, Design, Segment_Tree	1102	100.00
2079	Watering Plants	Medium	Array	157	100.00
2078	Two Furthest Houses With Different Colors	Easy	Array, Greedy	131	100.00
2076	Process Restricted Friend Requests	Hard	Graph, Union_Find	355	100.00
2075	Decode the Slanted Ciphertext	Medium	String, Simulation	418	100.00
2074	Reverse Nodes in Even Length Groups	Medium	Linked_List	1197	50.00
2073	Time Needed to Buy Tickets	Easy	Array, Simulation, Queue	145	100.00
2071	Maximum Number of Tasks You Can Assign	Hard	Array, Sorting, Greedy, Binary_Search, Queue, Monotonic_Queue	747	100.00
2070	Most Beautiful Item for Each Query	Medium	Array, Sorting, Binary_Search	747	100.00
2069	Walking Robot Simulation II	Medium	Design, Simulation	636	100.00
2068	Check Whether Two Strings are Almost Equivalent	Easy	String, Hash_Table, Counting	131	100.00
2065	Maximum Path Quality of a Graph	Hard	Array, Graph, Backtracking	429	100.00
2064	Minimized Maximum of Products Distributed to Any Store	Medium	Array, Binary_Search	609	100.00
2063	Vowels of All Substrings	Medium	String, Dynamic_Programming, Math, Combinatorics	206	100.00
2062	Count Vowel Substrings of a String	Easy	String, Hash_Table	216	60.00
2060	Check if an Original String Exists Given Two Encoded Strings	Hard	String, Dynamic_Programming	1219	100.00
2059	Minimum Operations to Convert Number	Medium	Array, Breadth_First_Search	285	66.67
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium	Linked_List	602	50.00
2057	Smallest Index With Equal Value	Easy	Array	178	100.00
2056	Number of Valid Move Combinations On Chessboard	Hard	Array, String, Simulation, Backtracking	600	100.00
2055	Plates Between Candles	Medium	Array, String, Binary_Search, Prefix_Sum	831	100.00
2054	Two Best Non-Overlapping Events	Medium	Array, Dynamic_Programming, Sorting, Binary_Search, Heap_Priority_Queue	851	100.00
2053	Kth Distinct String in an Array	Easy	Array, String, Hash_Table, Counting	181	90.00
2050	Parallel Courses III	Hard	Dynamic_Programming, Graph, Topological_Sort	974	100.00
2049	Count Nodes With the Highest Score	Medium	Array, Depth_First_Search, Tree, Binary_Tree	483	100.00
2048	Next Greater Numerically Balanced Number	Medium	Math, Backtracking, Enumeration	138	100.00
2047	Number of Valid Words in a Sentence	Easy	String	202	100.00
2045	Second Minimum Time to Reach Destination	Hard	Breadth_First_Search, Graph, Shortest_Path	862	100.00
2044	Count Number of Maximum Bitwise-OR Subsets	Medium	Array, Bit_Manipulation, Backtracking	140	100.00
2043	Simple Bank System	Medium	Array, Hash_Table, Design, Simulation	968	100.00
2042	Check if Numbers Are Ascending in a Sentence	Easy	String	161	64.29
2040	Kth Smallest Product of Two Sorted Arrays	Hard	Array, Binary_Search	1001	100.00
2039	The Time When the Network Becomes Idle	Medium	Array, Breadth_First_Search, Graph	1197	100.00
2038	Remove Colored Pieces if Both Neighbors are the Same Color	Medium	String, Math, Greedy, Game_Theory	216	74.36
2037	Minimum Number of Moves to Seat Everyone	Easy	Array, Sorting	189	80.00
2035	Partition Array Into Two Arrays to Minimize Sum Difference	Hard	Array, Dynamic_Programming, Binary_Search, Two_Pointers, Bit_Manipulation, Ordered_Set, Bitmask	1318	100.00
2034	Stock Price Fluctuation	Medium	Hash_Table, Design, Heap_Priority_Queue, Ordered_Set, Data_Stream	985	100.00
2033	Minimum Operations to Make a Uni-Value Grid	Medium	Array, Math, Sorting, Matrix	744	100.00
2032	Two Out of Three	Easy	Array, Hash_Table	251	83.33
2030	Smallest K-Length Subsequence With Occurrences of a Letter	Hard	String, Greedy, Stack, Monotonic_Stack	501	100.00
2029	Stone Game IX	Medium	Array, Math, Greedy, Counting, Game_Theory	574	100.00
2028	Find Missing Observations	Medium	Array, Math, Simulation	654	33.33
2027	Minimum Moves to Convert String	Easy	String, Greedy	142	100.00
2025	Maximum Number of Ways to Partition an Array	Hard	Array, Hash_Table, Prefix_Sum, Counting, Enumeration	1163	100.00
2024	Maximize the Confusion of an Exam	Medium	String, Binary_Search, Prefix_Sum, Sliding_Window	223	83.33
2023	Number of Pairs of Strings With Concatenation Equal to Target	Medium	Array, String	228	40.00
2022	Convert 1D Array Into 2D Array	Easy	Array, Matrix, Simulation	631	100.00
2019	The Score of Students Solving Math Expression	Hard	Array, String, Dynamic_Programming, Math, Stack, Memoization	1497	100.00
2018	Check if Word Can Be Placed In Crossword	Medium	Array, Matrix, Enumeration	698	100.00
2017	Grid Game	Medium	Array, Matrix, Prefix_Sum	578	87.50
2016	Maximum Difference Between Increasing Elements	Easy	Array	140	100.00
2014	Longest Subsequence Repeated k Times	Hard	String, Greedy, Backtracking, Counting, Enumeration	333	100.00
2013	Detect Squares	Medium	Array, Hash_Table, Design, Counting	511	100.00
2012	Sum of Beauty in the Array	Medium	Array	511	100.00
2011	Final Value of Variable After Performing Operations	Easy	Array, String, Simulation	178	44.55
2009	Minimum Number of Operations to Make Array Continuous	Hard	Array, Binary_Search	603	100.00
2008	Maximum Earnings From Taxi	Medium	Array, Dynamic_Programming, Sorting, Binary_Search	1008	100.00
2007	Find Original Array From Doubled Array	Medium	Array, Hash_Table, Sorting, Greedy	753	100.00
2006	Count Number of Pairs With Absolute Difference K	Easy	Array, Hash_Table, Counting	186	100.00
2003	Smallest Missing Genetic Value in Each Subtree	Hard	Dynamic_Programming, Depth_First_Search, Tree, Union_Find	984	100.00
2002	Maximum Product of the Length of Two Palindromic Subsequences	Medium	String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	389	100.00
2001	Number of Pairs of Interchangeable Rectangles	Medium	Array, Hash_Table, Math, Counting, Number_Theory	797	100.00
2000	Reverse Prefix of Word	Easy	String, Two_Pointers	164	31.25
1998	GCD Sort of an Array	Hard	Array, Math, Sorting, Union_Find	437	100.00
1997	First Day Where You Have Been in All the Rooms	Medium	Array, Dynamic_Programming	572	100.00
1996	The Number of Weak Characters in the Game	Medium	Array, Sorting, Greedy, Stack, Monotonic_Stack	1234	100.00
1995	Count Special Quadruplets	Easy	Array, Enumeration	146	100.00
1994	The Number of Good Subsets	Hard	Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask	737	100.00
1993	Operations on Tree	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Design	1117	100.00
1992	Find All Groups of Farmland	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	768	100.00
1991	Find the Middle Index in Array	Easy	Array, Prefix_Sum	142	100.00
1987	Number of Unique Good Subsequences	Hard	String, Dynamic_Programming	248	100.00
1986	Minimum Number of Work Sessions to Finish the Tasks	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	153	100.00
1985	Find the Kth Largest Integer in the Array	Medium	Array, String, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect	397	100.00
1984	Minimum Difference Between Highest and Lowest of K Scores	Easy	Array, Sorting, Sliding_Window	227	83.33
1982	Find Array Given Subset Sums	Hard	Array, Divide_and_Conquer	640	100.00
1981	Minimize the Difference Between Target and Chosen Elements	Medium	Array, Dynamic_Programming, Matrix	588	100.00
1980	Find Unique Binary String	Medium	Array, String, Backtracking	186	50.00
1979	Find Greatest Common Divisor of Array	Easy	Array, Math, Number_Theory	172	100.00
1978	Employees Whose Manager Left the Company	Easy	Database	686	64.74
1977	Number of Ways to Separate Numbers	Hard	String, Dynamic_Programming, Suffix_Array	199	100.00
1976	Number of Ways to Arrive at Destination	Medium	Dynamic_Programming, Graph, Topological_Sort, Shortest_Path	282	100.00
1975	Maximum Matrix Sum	Medium	Array, Greedy, Matrix	535	100.00
1974	Minimum Time to Type Word Using Special Typewriter	Easy	String, Greedy	139	71.43
1971	Find if Path Exists in Graph	Easy	Depth_First_Search, Breadth_First_Search, Graph	949	86.89
1970	Last Day Where You Can Still Cross	Hard	Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Union_Find	703	100.00
1969	Minimum Non-Zero Product of the Array Elements	Medium	Math, Greedy, Recursion	131	100.00
1968	Array With Elements Not Equal to Average of Neighbors	Medium	Array, Sorting, Greedy	973	83.33
1967	Number of Strings That Appear as Substrings in Word	Easy	String	157	100.00
1965	Employees With Missing Information	Easy	Database, SQL_I_Day_4_Union_and_Select	949	88.66
1964	Find the Longest Valid Obstacle Course at Each Position	Hard	Array, Binary_Search, Binary_Indexed_Tree	846	40.00
1963	Minimum Number of Swaps to Make the String Balanced	Medium	String, Greedy, Two_Pointers, Stack	291	53.85
1962	Remove Stones to Minimize the Total	Medium	Array, Heap_Priority_Queue	888	68.42
1961	Check If String Is a Prefix of Array	Easy	Array, String	162	100.00
1960	Maximum Product of the Length of Two Palindromic Substrings	Hard	String, Hash_Function, Rolling_Hash	247	100.00
1959	Minimum Total Space Wasted With K Resizing Operations	Medium	Array, Dynamic_Programming	225	100.00
1958	Check if Move is Legal	Medium	Array, Matrix, Enumeration	169	100.00
1957	Delete Characters to Make Fancy String	Easy	String	377	50.00
1955	Count Number of Special Subsequences	Hard	Array, Dynamic_Programming	620	100.00
1954	Minimum Garden Perimeter to Collect Enough Apples	Medium	Math, Binary_Search	132	100.00
1953	Maximum Number of Weeks for Which You Can Work	Medium	Array, Greedy	461	100.00
1952	Three Divisors	Easy	Math	141	33.33
1948	Delete Duplicate Folders in System	Hard	Array, String, Hash_Table, Trie, Hash_Function	1420	100.00
1947	Maximum Compatibility Score Sum	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	179	100.00
1946	Largest Number After Mutating Substring	Medium	Array, String, Greedy	346	100.00
1945	Sum of Digits of String After Convert	Easy	String, Simulation	146	75.00
1944	Number of Visible People in a Queue	Hard	Array, Stack, Monotonic_Stack	605	90.00
1943	Describe the Painting	Medium	Array, Prefix_Sum	951	100.00
1942	The Number of the Smallest Unoccupied Chair	Medium	Array, Heap_Priority_Queue, Ordered_Set	549	100.00
1941	Check if All Characters Have Equal Number of Occurrences	Easy	String, Hash_Table, Counting	167	78.57
1938	Maximum Genetic Difference Query	Hard	Array, Bit_Manipulation, Trie	855	100.00
1937	Maximum Number of Points with Cost	Medium	Array, Dynamic_Programming	886	100.00
1936	Add Minimum Number of Rungs	Medium	Array, Greedy	405	100.00
1935	Maximum Number of Words You Can Type	Easy	String, Hash_Table	178	37.50
1934	Confirmation Rate	Medium	Database	1602	35.78
1932	Merge BSTs to Create Single BST	Hard	Hash_Table, Depth_First_Search, Tree, Binary_Search, Binary_Tree	1146	100.00
1931	Painting a Grid With Three Different Colors	Hard	Dynamic_Programming	135	100.00
1930	Unique Length-3 Palindromic Subsequences	Medium	String, Hash_Table, Prefix_Sum	273	100.00
1929	Concatenation of Array	Easy	Array	220	94.47
1928	Minimum Cost to Reach Destination in Time	Hard	Dynamic_Programming, Graph	414	100.00
1927	Sum Game	Medium	Math, Greedy, Game_Theory	211	100.00
1926	Nearest Exit from Entrance in Maze	Medium	Array, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems	351	94.44
1925	Count Square Sum Triples	Easy	Math, Enumeration	161	40.00
1923	Longest Common Subpath	Hard	Array, Binary_Search, Hash_Function, Rolling_Hash, Suffix_Array	1142	100.00
1922	Count Good Numbers	Medium	Math, Recursion	135	100.00
1921	Eliminate Maximum Number of Monsters	Medium	Array, Sorting, Greedy	507	100.00
1920	Build Array from Permutation	Easy	Array, Simulation	252	81.25
1916	Count Ways to Build Rooms in an Ant Colony	Hard	Dynamic_Programming, Math, Tree, Graph, Topological_Sort, Combinatorics	2564	100.00
1915	Number of Wonderful Substrings	Medium	String, Hash_Table, Bit_Manipulation, Prefix_Sum	267	100.00
1914	Cyclically Rotating a Grid	Medium	Array, Matrix, Simulation	282	100.00
1913	Maximum Product Difference Between Two Pairs	Easy	Array, Sorting	261	100.00
1912	Design Movie Rental System	Hard	Array, Hash_Table, Design, Heap_Priority_Queue, Ordered_Set	3005	100.00
1911	Maximum Alternating Subsequence Sum	Medium	Array, Dynamic_Programming	531	100.00
1910	Remove All Occurrences of a Substring	Medium	String	177	100.00
1909	Remove One Element to Make the Array Strictly Increasing	Easy	Array	176	50.00
1907	Count Salary Categories	Medium	Database	2283	89.29
1906	Minimum Absolute Difference Queries	Medium	Array, Hash_Table	1069	50.00
1905	Count Sub Islands	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems	866	100.00
1904	The Number of Full Rounds You Have Played	Medium	String, Math	149	100.00
1903	Largest Odd Number in String	Easy	String, Math, Greedy	256	75.00
1901	Find a Peak Element II	Medium	Array, Binary_Search, Matrix, Divide_and_Conquer, Binary_Search_II_Day_17	726	100.00
1900	The Earliest and Latest Rounds Where Players Compete	Hard	Dynamic_Programming, Memoization	142	100.00
1899	Merge Triplets to Form Target Triplet	Medium	Array, Greedy	954	71.43
1898	Maximum Number of Removable Characters	Medium	Array, String, Binary_Search, Binary_Search_II_Day_6	636	100.00
1897	Redistribute Characters to Make All Strings Equal	Easy	String, Hash_Table, Counting	179	100.00
1896	Minimum Cost to Change the Final Value of Expression	Hard	String, Dynamic_Programming, Math, Stack	252	100.00
1895	Largest Magic Square	Medium	Array, Matrix, Prefix_Sum	202	100.00
1894	Find the Student that Will Replace the Chalk	Medium	Array, Binary_Search, Simulation, Prefix_Sum, Binary_Search_II_Day_2	520	50.00
1893	Check if All the Integers in a Range Are Covered	Easy	Array, Hash_Table, Prefix_Sum	140	100.00
1890	The Latest Login in 2020	Easy	Database, SQL_I_Day_8_Function	1280	43.62
1889	Minimum Space Wasted From Packaging	Hard	Array, Sorting, Binary_Search, Prefix_Sum	910	100.00
1888	Minimum Number of Flips to Make the Binary String Alternating	Medium	String, Greedy	259	87.50
1887	Reduction Operations to Make the Array Elements Equal	Medium	Array, Sorting	457	100.00
1886	Determine Whether Matrix Can Be Obtained By Rotation	Easy	Array, Matrix, Programming_Skills_II_Day_7	147	85.71
1884	Egg Drop With 2 Eggs and N Floors	Medium	Dynamic_Programming, Math	130	100.00
1883	Minimum Skips to Arrive at Meeting On Time	Hard	Array, Dynamic_Programming	278	100.00
1882	Process Tasks Using Servers	Medium	Array, Heap_Priority_Queue	1085	100.00
1881	Maximum Value after Insertion	Medium	String, Greedy	362	100.00
1880	Check if Word Equals Summation of Two Words	Easy	String	139	80.00
1879	Minimum XOR Sum of Two Arrays	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	173	100.00
1878	Get Biggest Three Rhombus Sums in a Grid	Medium	Array, Math, Sorting, Matrix, Heap_Priority_Queue, Prefix_Sum	326	100.00
1877	Minimize Maximum Pair Sum in Array	Medium	Array, Sorting, Greedy, Two_Pointers	668	50.00
1876	Substrings of Size Three with Distinct Characters	Easy	String, Hash_Table, Counting, Sliding_Window	144	91.67
1873	Calculate Special Bonus	Easy	Database, SQL_I_Day_2_Select_and_Order	1321	33.12
1872	Stone Game VIII	Hard	Array, Dynamic_Programming, Math, Prefix_Sum, Game_Theory	569	100.00
1871	Jump Game VII	Medium	String, Two_Pointers, Prefix_Sum	247	100.00
1870	Minimum Speed to Arrive on Time	Medium	Array, Binary_Search, Binary_Search_II_Day_6	628	50.00
1869	Longer Contiguous Segments of Ones than Zeros	Easy	String	118	100.00
1866	Number of Ways to Rearrange Sticks With K Sticks Visible	Hard	Dynamic_Programming, Math, Combinatorics	188	100.00
1865	Finding Pairs With a Certain Sum	Medium	Array, Hash_Table, Design	1050	100.00
1864	Minimum Number of Swaps to Make the Binary String Alternating	Medium	String, Greedy	140	100.00
1863	Sum of All Subset XOR Totals	Easy	Array, Math, Bit_Manipulation, Backtracking, Combinatorics	128	80.00
1862	Sum of Floored Pairs	Hard	Array, Math, Binary_Search, Prefix_Sum	710	100.00
1861	Rotating the Box	Medium	Array, Matrix, Two_Pointers	882	60.00
1860	Incremental Memory Leak	Medium	Simulation	161	100.00
1859	Sorting the Sentence	Easy	String, Sorting	155	89.29
1857	Largest Color Value in a Directed Graph	Hard	Hash_Table, Dynamic_Programming, Graph, Counting, Memoization, Topological_Sort	1005	60.00
1856	Maximum Subarray Min-Product	Medium	Array, Stack, Prefix_Sum, Monotonic_Stack	517	66.67
1855	Maximum Distance Between a Pair of Values	Medium	Array, Greedy, Binary_Search, Two_Pointers, Binary_Search_I_Day_11	458	100.00
1854	Maximum Population Year	Easy	Array, Counting	148	90.00
1851	Minimum Interval to Include Each Query	Hard	Array, Sorting, Binary_Search, Heap_Priority_Queue, Line_Sweep	1612	87.50
1850	Minimum Adjacent Swaps to Reach the Kth Smallest Number	Medium	String, Greedy, Two_Pointers	193	100.00
1849	Splitting a String Into Descending Consecutive Values	Medium	String, Backtracking	136	100.00
1848	Minimum Distance to the Target Element	Easy	Array	172	80.00
1847	Closest Room	Hard	Array, Sorting, Binary_Search	1179	100.00
1846	Maximum Element After Decreasing and Rearranging	Medium	Array, Sorting, Greedy	412	100.00
1845	Seat Reservation Manager	Medium	Design, Heap_Priority_Queue, Programming_Skills_II_Day_17	834	100.00
1844	Replace All Digits with Characters	Easy	String	137	100.00
1840	Maximum Building Height	Hard	Array, Math	1210	100.00
1839	Longest Substring Of All Vowels in Order	Medium	String, Sliding_Window	290	80.00
1838	Frequency of the Most Frequent Element	Medium	Array, Sorting, Greedy, Binary_Search, Prefix_Sum, Sliding_Window, Binary_Search_II_Day_9	564	88.89
1837	Sum of Digits in Base K	Easy	Math	120	100.00
1835	Find XOR Sum of All Pairs Bitwise AND	Hard	Array, Math, Bit_Manipulation	604	100.00
1834	Single-Threaded CPU	Medium	Array, Sorting, Heap_Priority_Queue	1050	100.00
1833	Maximum Ice Cream Bars	Medium	Array, Sorting, Greedy	439	100.00
1832	Check if the Sentence Is Pangram	Easy	String, Hash_Table	127	98.00
1830	Minimum Number of Operations to Make String Sorted	Hard	String, Math, Combinatorics	226	100.00
1829	Maximum XOR for Each Query	Medium	Array, Bit_Manipulation, Prefix_Sum	680	100.00
1828	Queries on Number of Points Inside a Circle	Medium	Array, Math, Geometry	284	100.00
1827	Minimum Operations to Make the Array Increasing	Easy	Array, Greedy	208	100.00
1825	Finding MK Average	Hard	Design, Heap_Priority_Queue, Ordered_Set, Queue	1101	100.00
1824	Minimum Sideway Jumps	Medium	Array, Dynamic_Programming, Greedy	726	100.00
1823	Find the Winner of the Circular Game	Medium	Array, Math, Simulation, Recursion, Queue, Data_Structure_II_Day_14_Stack_Queue	119	87.50
1822	Sign of the Product of an Array	Easy	Array, Math, Programming_Skills_I_Day_4_Loop	170	92.51
1819	Number of Different Subsequences GCDs	Hard	Array, Math, Counting, Number_Theory	624	100.00
1818	Minimum Absolute Sum Difference	Medium	Array, Sorting, Binary_Search, Ordered_Set, Binary_Search_II_Day_7	447	100.00
1817	Finding the Users Active Minutes	Medium	Array, Hash_Table	652	100.00
1816	Truncate Sentence	Easy	Array, String	147	94.74
1815	Maximum Number of Groups Getting Fresh Donuts	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization	1073	100.00
1814	Count Nice Pairs in an Array	Medium	Array, Hash_Table, Math, Counting	520	100.00
1813	Sentence Similarity III	Medium	Array, String, Two_Pointers	162	100.00
1812	Determine Color of a Chessboard Square	Easy	String, Math	127	92.86
1808	Maximize Number of Nice Divisors	Hard	Math, Recursion	135	100.00
1807	Evaluate the Bracket Pairs of a String	Medium	Array, String, Hash_Table	689	100.00
1806	Minimum Number of Operations to Reinitialize a Permutation	Medium	Array, Math, Simulation	117	100.00
1805	Number of Different Integers in a String	Easy	String, Hash_Table	162	100.00
1803	Count Pairs With XOR in a Range	Hard	Array, Bit_Manipulation, Trie	427	100.00
1802	Maximum Value at a Given Index in a Bounded Array	Medium	Greedy, Binary_Search, Binary_Search_II_Day_17	118	100.00
1801	Number of Orders in the Backlog	Medium	Array, Heap_Priority_Queue, Simulation	668	100.00
1800	Maximum Ascending Subarray Sum	Easy	Array	139	100.00
1799	Maximize Score After N Operations	Hard	Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask, Number_Theory	347	73.17
1798	Maximum Number of Consecutive Values You Can Make	Medium	Array, Greedy	414	100.00
1797	Design Authentication Manager	Medium	Hash_Table, Design, Programming_Skills_II_Day_19	334	100.00
1796	Second Largest Digit in a String	Easy	String, Hash_Table	148	100.00
1795	Rearrange Products Table	Easy	Database, SQL_I_Day_4_Union_and_Select	1027	67.57
1793	Maximum Score of a Good Subarray	Hard	Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack	568	100.00
1792	Maximum Average Pass Ratio	Medium	Array, Greedy, Heap_Priority_Queue	1111	75.00
1791	Find Center of Star Graph	Easy	Graph	476	91.67
1790	Check if One String Swap Can Make Strings Equal	Easy	String, Hash_Table, Counting, Programming_Skills_I_Day_4_Loop	138	100.00
1789	Primary Department for Each Employee	Easy	Database	1122	74.47
1787	Make the XOR of All Segments Equal to Zero	Hard	Array, Dynamic_Programming, Bit_Manipulation	374	100.00
1786	Number of Restricted Paths From First to Last Node	Medium	Dynamic_Programming, Heap_Priority_Queue, Graph, Topological_Sort, Shortest_Path	977	100.00
1785	Minimum Elements to Add to Form a Given Sum	Medium	Array, Greedy	595	100.00
1784	Check if Binary String Has at Most One Segment of Ones	Easy	String	135	85.71
1782	Count Pairs Of Nodes	Hard	Binary_Search, Two_Pointers, Graph	1441	100.00
1781	Sum of Beauty of All Substrings	Medium	String, Hash_Table, Counting	172	100.00
1780	Check if Number is a Sum of Powers of Three	Medium	Math	133	66.67
1779	Find Nearest Point That Has the Same X or Y Coordinate	Easy	Array, Programming_Skills_I_Day_3_Conditional_Statements	364	100.00
1776	Car Fleet II	Hard	Array, Math, Stack, Heap_Priority_Queue, Monotonic_Stack	2049	100.00
1775	Equal Sum Arrays With Minimum Number of Operations	Medium	Array, Hash_Table, Greedy, Counting	529	100.00
1774	Closest Dessert Cost	Medium	Array, Dynamic_Programming, Backtracking	147	100.00
1773	Count Items Matching a Rule	Easy	Array, String	227	97.50
1771	Maximize Palindrome Length From Subsequences	Hard	String, Dynamic_Programming	248	100.00
1770	Maximum Score from Performing Multiplication Operations	Hard	Array, Dynamic_Programming	436	91.67
1769	Minimum Number of Operations to Move All Balls to Each Box	Medium	Array, String	217	75.00
1768	Merge Strings Alternately	Easy	String, Two_Pointers, Programming_Skills_I_Day_8_String	138	93.81
1766	Tree of Coprimes	Hard	Math, Depth_First_Search, Breadth_First_Search, Tree	991	100.00
1765	Map of Highest Peak	Medium	Array, Breadth_First_Search, Matrix	1087	100.00
1764	Form Array by Concatenating Subarrays of Another Array	Medium	Array, Greedy, String_Matching	206	100.00
1763	Longest Nice Substring	Easy	String, Hash_Table, Bit_Manipulation, Sliding_Window	158	91.67
1761	Minimum Degree of a Connected Trio in a Graph	Hard	Graph	590	50.00
1760	Minimum Limit of Balls in a Bag	Medium	Array, Binary_Search, Binary_Search_II_Day_3	460	100.00
1759	Count Number of Homogenous Substrings	Medium	String, Math	230	100.00
1758	Minimum Changes To Make Alternating Binary String	Easy	String	153	100.00
1757	Recyclable and Low Fat Products	Easy	Database, SQL_I_Day_1_Select	1237	34.20
1755	Closest Subsequence Sum	Hard	Array, Dynamic_Programming, Two_Pointers, Bit_Manipulation, Bitmask	620	100.00
1754	Largest Merge Of Two Strings	Medium	String, Greedy, Two_Pointers	217	100.00
1753	Maximum Score From Removing Stones	Medium	Math, Greedy, Heap_Priority_Queue	141	100.00
1752	Check if Array Is Sorted and Rotated	Easy	Array	133	85.71
1751	Maximum Number of Events That Can Be Attended II	Hard	Array, Dynamic_Programming, Binary_Search	608	100.00
1750	Minimum Length of String After Deleting Similar Ends	Medium	String, Two_Pointers	215	100.00
1749	Maximum Absolute Sum of Any Subarray	Medium	Array, Dynamic_Programming	367	100.00
1748	Sum of Unique Elements	Easy	Array, Hash_Table, Counting	143	82.35
1745	Palindrome Partitioning IV	Hard	String, Dynamic_Programming	179	100.00
1744	Can You Eat Your Favorite Candy on Your Favorite Day?	Medium	Array, Prefix_Sum	809	100.00
1743	Restore the Array From Adjacent Pairs	Medium	Array, Hash_Table	1018	100.00
1742	Maximum Number of Balls in a Box	Easy	Hash_Table, Math, Counting	125	100.00
1741	Find Total Time Spent by Each Employee	Easy	Database, SQL_I_Day_8_Function	1101	51.40
1739	Building Boxes	Hard	Math, Greedy, Binary_Search	133	100.00
1738	Find Kth Largest XOR Coordinate Value	Medium	Array, Matrix, Bit_Manipulation, Heap_Priority_Queue, Prefix_Sum, Divide_and_Conquer, Quickselect	936	100.00
1737	Change Minimum Characters to Satisfy One of Three Conditions	Medium	String, Hash_Table, Prefix_Sum, Counting	240	100.00
1736	Latest Time by Replacing Hidden Digits	Easy	String, Greedy	161	100.00
1735	Count Ways to Make Array With Product	Hard	Array, Dynamic_Programming, Math	394	100.00
1734	Decode XORed Permutation	Medium	Array, Bit_Manipulation	684	100.00
1733	Minimum Number of People to Teach	Medium	Array, Greedy	580	100.00
1732	Find the Highest Altitude	Easy	Array, Prefix_Sum	139	90.70
1731	The Number of Employees Which Report to Each Employee	Easy	Database	1385	39.02
1729	Find Followers Count	Easy	Database, SQL_I_Day_7_Function	1228	38.04
1728	Cat and Mouse II	Hard	Array, Dynamic_Programming, Math, Matrix, Graph, Memoization, Topological_Sort, Game_Theory	193	100.00
1727	Largest Submatrix With Rearrangements	Medium	Array, Sorting, Greedy, Matrix	650	100.00
1726	Tuple with Same Product	Medium	Array, Hash_Table	762	100.00
1725	Number Of Rectangles That Can Form The Largest Square	Easy	Array	244	100.00
1723	Find Minimum Time to Finish All Jobs	Hard	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	167	100.00
1722	Minimize Hamming Distance After Swap Operations	Medium	Array, Depth_First_Search, Union_Find	843	100.00
1721	Swapping Nodes in a Linked List	Medium	Two_Pointers, Linked_List	726	91.30
1720	Decode XORed Array	Easy	Array, Bit_Manipulation	304	95.00
1719	Number Of Ways To Reconstruct A Tree	Hard	Tree, Graph, Topological_Sort	1015	100.00
1718	Construct the Lexicographically Largest Valid Sequence	Medium	Array, Backtracking	140	100.00
1717	Maximum Score From Removing Substrings	Medium	String, Greedy, Stack	265	100.00
1716	Calculate Money in Leetcode Bank	Easy	Math	119	66.67
1713	Minimum Operations to Make a Subsequence	Hard	Array, Hash_Table, Greedy, Binary_Search	862	100.00
1712	Ways to Split Array Into Three Subarrays	Medium	Array, Binary_Search, Two_Pointers, Prefix_Sum, Binary_Search_II_Day_10	486	100.00
1711	Count Good Meals	Medium	Array, Hash_Table	549	100.00
1710	Maximum Units on a Truck	Easy	Array, Sorting, Greedy	228	100.00
1707	Maximum XOR With an Element From Array	Hard	Array, Bit_Manipulation, Trie	1295	100.00
1706	Where Will the Ball Fall	Medium	Array, Dynamic_Programming, Depth_First_Search, Matrix, Simulation, Level_2_Day_1_Implementation/Simulation	270	67.86
1705	Maximum Number of Eaten Apples	Medium	Array, Greedy, Heap_Priority_Queue	428	100.00
1704	Determine if String Halves Are Alike	Easy	String, Counting	162	83.33
1703	Minimum Adjacent Swaps for K Consecutive Ones	Hard	Array, Greedy, Prefix_Sum, Sliding_Window	518	100.00
1702	Maximum Binary String After Change	Medium	String, Greedy	343	100.00
1701	Average Waiting Time	Medium	Array, Simulation	654	100.00
1700	Number of Students Unable to Eat Lunch	Easy	Array, Stack, Simulation, Queue	143	100.00
1697	Checking Existence of Edge Length Limited Paths	Hard	Array, Sorting, Graph, Union_Find	1411	72.90
1696	Jump Game VI	Medium	Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue	497	100.00
1695	Maximum Erasure Value	Medium	Array, Hash_Table, Sliding_Window	478	100.00
1694	Reformat Phone Number	Easy	String	142	100.00
1693	Daily Leads and Partners	Easy	Database, SQL_I_Day_7_Function	1115	52.84
1691	Maximum Height by Stacking Cuboids	Hard	Array, Dynamic_Programming, Sorting	187	100.00
1690	Stone Game VII	Medium	Array, Dynamic_Programming, Math, Game_Theory	196	100.00
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium	String, Greedy	226	84.44
1688	Count of Matches in Tournament	Easy	Math, Simulation	124	83.33
1687	Delivering Boxes from Storage to Ports	Hard	Array, Dynamic_Programming, Heap_Priority_Queue, Queue, Segment_Tree, Monotonic_Queue	778	100.00
1686	Stone Game VI	Medium	Array, Math, Sorting, Greedy, Heap_Priority_Queue, Game_Theory	702	100.00
1685	Sum of Absolute Differences in a Sorted Array	Medium	Array, Math, Prefix_Sum	612	100.00
1684	Count the Number of Consistent Strings	Easy	Array, String, Hash_Table, Bit_Manipulation	234	100.00
1683	Invalid Tweets	Easy	Database	1263	53.93
1681	Minimum Incompatibility	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	162	100.00
1680	Concatenation of Consecutive Binary Numbers	Medium	Math, Bit_Manipulation, Simulation	175	100.00
1679	Max Number of K-Sum Pairs	Medium	Array, Hash_Table, Sorting, Two_Pointers	468	92.86
1678	Goal Parser Interpretation	Easy	String, Programming_Skills_I_Day_8_String	136	88.24
1675	Minimize Deviation in Array	Hard	Array, Greedy, Heap_Priority_Queue, Ordered_Set	769	100.00
1674	Minimum Moves to Make Array Complementary	Medium	Array, Hash_Table, Prefix_Sum	522	100.00
1673	Find the Most Competitive Subsequence	Medium	Array, Greedy, Stack, Monotonic_Stack	741	100.00
1672	Richest Customer Wealth	Easy	Array, Matrix, Programming_Skills_I_Day_6_Array	155	94.54
1671	Minimum Number of Removals to Make Mountain Array	Hard	Array, Dynamic_Programming, Greedy, Binary_Search	264	100.00
1670	Design Front Middle Back Queue	Medium	Array, Design, Linked_List, Queue, Data_Stream	267	100.00
1669	Merge In Between Linked Lists	Medium	Linked_List	531	66.67
1668	Maximum Repeating Substring	Easy	String, String_Matching	170	100.00
1667	Fix Names in a Table	Easy	Database, SQL_I_Day_3_String_Processing_Functions	1196	61.40
1665	Minimum Initial Energy to Finish Tasks	Hard	Array, Sorting, Greedy	823	100.00
1664	Ways to Make a Fair Array	Medium	Array, Dynamic_Programming	475	100.00
1663	Smallest String With A Given Numeric Value	Medium	String, Greedy	202	100.00
1662	Check If Two String Arrays are Equivalent	Easy	Array, String	144	86.84
1661	Average Time of Process per Machine	Easy	Database	429	71.35
1659	Maximize Grid Happiness	Hard	Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization	181	100.00
1658	Minimum Operations to Reduce X to Zero	Medium	Array, Hash_Table, Binary_Search, Prefix_Sum, Sliding_Window	532	50.00
1657	Determine if Two Strings Are Close	Medium	String, Hash_Table, Sorting	287	100.00
1656	Design an Ordered Stream	Easy	Array, Hash_Table, Design, Data_Stream	487	91.67
1655	Distribute Repeating Integers	Hard	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	445	100.00
1654	Minimum Jumps to Reach Home	Medium	Array, Dynamic_Programming, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search	192	100.00
1653	Minimum Deletions to Make String Balanced	Medium	String, Dynamic_Programming, Stack	291	100.00
1652	Defuse the Bomb	Easy	Array	160	100.00
1649	Create Sorted Array through Instructions	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	571	100.00
1648	Sell Diminishing-Valued Colored Balls	Medium	Array, Math, Sorting, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_19	509	100.00
1647	Minimum Deletions to Make Character Frequencies Unique	Medium	String, Sorting, Greedy	252	100.00
1646	Get Maximum in Generated Array	Easy	Array, Dynamic_Programming, Simulation	142	100.00
1643	Kth Smallest Instructions	Hard	Array, Dynamic_Programming, Math, Combinatorics	171	100.00
1642	Furthest Building You Can Reach	Medium	Array, Greedy, Heap_Priority_Queue	457	71.43
1641	Count Sorted Vowel Strings	Medium	Dynamic_Programming	141	42.86
1640	Check Array Formation Through Concatenation	Easy	Array, Hash_Table	154	100.00
1639	Number of Ways to Form a Target String Given a Dictionary	Hard	Array, String, Dynamic_Programming	408	100.00
1638	Count Substrings That Differ by One Character	Medium	String, Hash_Table, Dynamic_Programming	143	100.00
1637	Widest Vertical Area Between Two Points Containing No Points	Easy	Array, Sorting	616	100.00
1636	Sort Array by Increasing Frequency	Easy	Array, Hash_Table, Sorting	222	95.65
1633	Percentage of Users Attended a Contest	Easy	Database	1556	93.74
1632	Rank Transform of a Matrix	Hard	Array, Greedy, Matrix, Graph, Union_Find, Topological_Sort	807	100.00
1631	Path With Minimum Effort	Medium	Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find	384	100.00
1630	Arithmetic Subarrays	Medium	Array, Sorting, Programming_Skills_II_Day_9	264	100.00
1629	Slowest Key	Easy	Array, String	200	75.00
1627	Graph Connectivity With Threshold	Hard	Array, Math, Union_Find	703	100.00
1626	Best Team With No Conflicts	Medium	Array, Dynamic_Programming, Sorting	370	100.00
1625	Lexicographically Smallest String After Applying Operations	Medium	String, Breadth_First_Search	415	100.00
1624	Largest Substring Between Two Equal Characters	Easy	String, Hash_Table	132	100.00
1622	Fancy Sequence	Hard	Math, Design, Segment_Tree	1050	100.00
1621	Number of Sets of K Non-Overlapping Line Segments	Medium	Dynamic_Programming, Math	147	100.00
1620	Coordinate With Maximum Network Quality	Medium	Array, Enumeration	233	100.00
1619	Mean of Array After Removing Some Elements	Easy	Array, Sorting	178	100.00
1617	Count Subtrees With Max Distance Between Cities	Hard	Dynamic_Programming, Tree, Bit_Manipulation, Bitmask, Enumeration	297	100.00
1616	Split Two Strings to Make Palindrome	Medium	String, Greedy, Two_Pointers	277	100.00
1615	Maximal Network Rank	Medium	Graph, Graph_Theory_I_Day_14_Graph_Theory	282	100.00
1614	Maximum Nesting Depth of the Parentheses	Easy	String, Stack	130	81.25
1611	Minimum One Bit Operations to Make Integers Zero	Hard	Dynamic_Programming, Bit_Manipulation, Memoization	127	100.00
1610	Maximum Number of Visible Points	Hard	Array, Math, Sorting, Sliding_Window, Geometry	1343	100.00
1609	Even Odd Tree	Medium	Breadth_First_Search, Tree, Binary_Tree	497	100.00
1608	Special Array With X Elements Greater Than or Equal X	Easy	Array, Sorting, Binary_Search, Binary_Search_I_Day_7	147	81.82
1606	Find Servers That Handled Most Number of Requests	Hard	Array, Greedy, Heap_Priority_Queue, Ordered_Set	973	33.33
1605	Find Valid Matrix Given Row and Column Sums	Medium	Array, Greedy, Matrix	574	100.00
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Medium	Array, String, Hash_Table, Sorting	704	83.33
1603	Design Parking System	Easy	Design, Simulation, Counting, Programming_Skills_I_Day_12_Class_and_Object	376	31.83
1601	Maximum Number of Achievable Transfer Requests	Hard	Array, Bit_Manipulation, Backtracking, Enumeration	206	100.00
1600	Throne Inheritance	Medium	Hash_Table, Depth_First_Search, Tree, Design	1847	100.00
1599	Maximum Profit of Operating a Centennial Wheel	Medium	Array, Simulation	593	100.00
1598	Crawler Log Folder	Easy	Array, String, Stack	150	92.31
1595	Minimum Cost to Connect Two Groups of Points	Hard	Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask	278	100.00
1594	Maximum Non Negative Product in a Matrix	Medium	Array, Dynamic_Programming, Matrix	224	100.00
1593	Split a String Into the Max Number of Unique Substrings	Medium	String, Hash_Table, Backtracking	161	100.00
1592	Rearrange Spaces Between Words	Easy	String	182	75.00
1591	Strange Printer II	Hard	Array, Matrix, Graph, Topological_Sort	321	100.00
1590	Make Sum Divisible by P	Medium	Array, Hash_Table, Prefix_Sum	464	100.00
1589	Maximum Sum Obtained of Any Permutation	Medium	Array, Sorting, Greedy, Prefix_Sum	867	66.67
1588	Sum of All Odd Length Subarrays	Easy	Array, Math, Prefix_Sum, Programming_Skills_I_Day_6_Array	157	64.00
1587	Bank Account Summary II	Easy	Database, SQL_I_Day_10_Where	1582	52.96
1585	Check If String Is Transformable With Substring Sort Operations	Hard	String, Sorting, Greedy	271	100.00
1584	Min Cost to Connect All Points	Medium	Array, Union_Find, Minimum_Spanning_Tree	331	95.12
1583	Count Unhappy Friends	Medium	Array, Simulation	324	100.00
1582	Special Positions in a Binary Matrix	Easy	Array, Matrix	212	60.00
1581	Customer Who Visited but Did Not Make Any Transactions	Easy	Database, SQL_I_Day_5_Union	2771	54.68
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	Graph, Union_Find	942	32.52
1578	Minimum Time to Make Rope Colorful	Medium	Array, String, Dynamic_Programming, Greedy	577	100.00
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Medium	Array, Hash_Table, Math, Two_Pointers	209	100.00
1576	Replace All ?’s to Avoid Consecutive Repeating Characters	Easy	String	180	37.50
1575	Count All Possible Routes	Hard	Array, Dynamic_Programming, Memoization	246	100.00
1574	Shortest Subarray to be Removed to Make Array Sorted	Medium	Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack, Binary_Search_II_Day_14	477	50.00
1573	Number of Ways to Split a String	Medium	String, Math	247	100.00
1572	Matrix Diagonal Sum	Easy	Array, Matrix, Programming_Skills_I_Day_7_Array, Udemy_2D_Arrays/Matrix	221	67.61
1569	Number of Ways to Reorder Array to Get Same BST	Hard	Array, Dynamic_Programming, Math, Tree, Binary_Tree, Union_Find, Binary_Search_Tree, Divide_and_Conquer, Memoization, Combinatorics	256	100.00
1568	Minimum Number of Days to Disconnect Island	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Strongly_Connected_Component	210	100.00
1567	Maximum Length of Subarray With Positive Product	Medium	Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_6	468	33.33
1566	Detect Pattern of Length M Repeated K or More Times	Easy	Array, Enumeration	168	33.33
1563	Stone Game V	Hard	Array, Dynamic_Programming, Math, Game_Theory	371	100.00
1562	Find Latest Group of Size M	Medium	Array, Binary_Search, Simulation, Binary_Search_II_Day_19	534	100.00
1561	Maximum Number of Coins You Can Get	Medium	Array, Math, Sorting, Greedy, Game_Theory	515	50.00
1560	Most Visited Sector in a Circular Track	Easy	Array, Simulation	230	100.00
1559	Detect Cycles in 2D Grid	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	871	33.33
1558	Minimum Numbers of Function Calls to Make Target Array	Medium	Array, Greedy	347	50.00
1557	Minimum Number of Vertices to Reach All Nodes	Medium	Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory	792	99.29
1556	Thousand Separator	Easy	String	131	100.00
1553	Minimum Number of Days to Eat N Oranges	Hard	Dynamic_Programming, Memoization	153	100.00
1552	Magnetic Force Between Two Balls	Medium	Array, Sorting, Binary_Search, Binary_Search_II_Day_4	636	100.00
1551	Minimum Operations to Make Array Equal	Medium	Math	119	100.00
1550	Three Consecutive Odds	Easy	Array	154	90.00
1547	Minimum Cost to Cut a Stick	Hard	Array, Dynamic_Programming	187	92.00
1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Medium	Array, Hash_Table, Greedy, Prefix_Sum	560	100.00
1545	Find Kth Bit in Nth Binary String	Medium	String, Recursion	141	100.00
1544	Make The String Great	Easy	String, Stack	164	92.16
1542	Find Longest Awesome Substring	Hard	String, Hash_Table, Bit_Manipulation	239	100.00
1541	Minimum Insertions to Balance a Parentheses String	Medium	String, Greedy, Stack	240	80.00
1540	Can Convert String in K Moves	Medium	String, Hash_Table	272	75.00
1539	Kth Missing Positive Number	Easy	Array, Binary_Search, Binary_Search_I_Day_6	153	100.00
1537	Get the Maximum Score	Hard	Array, Dynamic_Programming, Greedy, Two_Pointers	453	100.00
1536	Minimum Swaps to Arrange a Binary Grid	Medium	Array, Greedy, Matrix	336	100.00
1535	Find the Winner of an Array Game	Medium	Array, Simulation	460	100.00
1534	Count Good Triplets	Easy	Array, Enumeration	175	66.67
1531	String Compression II	Hard	String, Dynamic_Programming	207	100.00
1530	Number of Good Leaf Nodes Pairs	Medium	Depth_First_Search, Tree, Binary_Tree	242	100.00
1529	Minimum Suffix Flips	Medium	String, Greedy	200	100.00
1528	Shuffle String	Easy	Array, String	180	89.23
1527	Patients With a Condition	Easy	Database, SQL_I_Day_3_String_Processing_Functions	708	48.23
1526	Minimum Number of Increments on Subarrays to Form a Target Array	Hard	Array, Dynamic_Programming, Greedy, Stack, Monotonic_Stack	466	100.00
1525	Number of Good Ways to Split a String	Medium	String, Dynamic_Programming, Bit_Manipulation	238	100.00
1524	Number of Sub-arrays With Odd Sum	Medium	Array, Dynamic_Programming, Math, Prefix_Sum	584	100.00
1523	Count Odd Numbers in an Interval Range	Easy	Math, Programming_Skills_I_Day_1_Basic_Data_Type	114	97.22
1521	Find a Value of a Mysterious Function Closest to Target	Hard	Array, Binary_Search, Bit_Manipulation, Segment_Tree	446	100.00
1520	Maximum Number of Non-Overlapping Substrings	Hard	String, Greedy	333	100.00
1519	Number of Nodes in the Sub-Tree With the Same Label	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Counting	1130	87.50
1518	Water Bottles	Easy	Math, Simulation	116	100.00
1517	Find Users With Valid E-Mails	Easy	Database	1278	77.30
1515	Best Position for a Service Centre	Hard	Math, Geometry, Randomized	183	100.00
1514	Path with Maximum Probability	Medium	Heap_Priority_Queue, Graph, Shortest_Path	681	100.00
1513	Number of Substrings With Only 1s	Medium	String, Math	171	100.00
1512	Number of Good Pairs	Easy	Array, Hash_Table, Math, Counting	138	70.65
1510	Stone Game IV	Hard	Dynamic_Programming, Math, Game_Theory	137	100.00
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium	Array, Sorting, Greedy	415	100.00
1508	Range Sum of Sorted Subarray Sums	Medium	Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_14	378	66.67
1507	Reformat Date	Easy	String	147	100.00
1505	Minimum Possible Integer After at Most K Adjacent Swaps On Digits	Hard	String, Greedy, Segment_Tree, Binary_Indexed_Tree	226	100.00
1504	Count Submatrices With All Ones	Medium	Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack	265	80.00
1503	Last Moment Before All Ants Fall Out of a Plank	Medium	Array, Simulation, Brainteaser	253	100.00
1502	Can Make Arithmetic Progression From Sequence	Easy	Array, Sorting, Programming_Skills_I_Day_4_Loop	156	94.82
1499	Max Value of Equation	Hard	Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue	708	100.00
1498	Number of Subsequences That Satisfy the Given Sum Condition	Medium	Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_15	487	97.89
1497	Check If Array Pairs Are Divisible by k	Medium	Array, Hash_Table, Counting	575	83.33
1496	Path Crossing	Easy	String, Hash_Table	120	100.00
1494	Parallel Courses II	Hard	Dynamic_Programming, Bit_Manipulation, Graph, Bitmask	381	100.00
1493	Longest Subarray of 1’s After Deleting One Element	Medium	Dynamic_Programming, Math, Sliding_Window	288	73.85
1492	The kth Factor of n	Medium	Math	133	65.12
1491	Average Salary Excluding the Minimum and Maximum Salary	Easy	Array, Sorting, Programming_Skills_I_Day_1_Basic_Data_Type	137	91.67
1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard	Sorting, Graph, Union_Find, Minimum_Spanning_Tree, Strongly_Connected_Component	342	100.00
1488	Avoid Flood in The City	Medium	Array, Hash_Table, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_18	823	66.67
1487	Making File Names Unique	Medium	Array, String, Hash_Table	553	50.00
1486	XOR Operation in an Array	Easy	Math, Bit_Manipulation	123	81.25
1484	Group Sold Products By The Date	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_3_String_Processing_Functions	899	40.76
1483	Kth Ancestor of a Tree Node	Hard	Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Tree, Binary_Search, Design	956	100.00
1482	Minimum Number of Days to Make m Bouquets	Medium	Array, Binary_Search, Binary_Search_II_Day_7	538	50.00
1481	Least Number of Unique Integers after K Removals	Medium	Array, Hash_Table, Sorting, Greedy, Counting	564	76.19
1480	Running Sum of 1d Array	Easy	Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum	161	84.80
1478	Allocate Mailboxes	Hard	Array, Dynamic_Programming, Math, Sorting	226	100.00
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum	Medium	Array, Hash_Table, Dynamic_Programming, Binary_Search, Sliding_Window	746	100.00
1476	Subrectangle Queries	Medium	Array, Matrix, Design	332	81.82
1475	Final Prices With a Special Discount in a Shop	Easy	Array, Stack, Monotonic_Stack	182	94.12
1473	Paint House III	Hard	Array, Dynamic_Programming	235	100.00
1472	Design Browser History	Medium	Array, Stack, Design, Linked_List, Data_Stream, Doubly_Linked_List	576	42.42
1471	The k Strongest Values in an Array	Medium	Array, Sorting, Two_Pointers	780	100.00
1470	Shuffle the Array	Easy	Array	220	41.96
1467	Probability of a Two Boxes Having The Same Number of Distinct Balls	Hard	Dynamic_Programming, Math, Backtracking, Combinatorics, Probability_and_Statistics	150	100.00
1466	Reorder Routes to Make All Paths Lead to the City Zero	Medium	Depth_First_Search, Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal	718	100.00
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium	Array, Sorting, Greedy	418	50.00
1464	Maximum Product of Two Elements in an Array	Easy	Array, Sorting, Heap_Priority_Queue	190	64.71
1463	Cherry Pickup II	Hard	Array, Dynamic_Programming, Matrix	198	100.00
1462	Course Schedule IV	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	512	100.00
1461	Check If a String Contains All Binary Codes of Size K	Medium	String, Hash_Table, Bit_Manipulation, Hash_Function, Rolling_Hash	482	100.00
1460	Make Two Arrays Equal by Reversing Sub-arrays	Easy	Array, Hash_Table, Sorting	231	66.67
1458	Max Dot Product of Two Subsequences	Hard	Array, Dynamic_Programming	215	100.00
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Bit_Manipulation	583	50.00
1456	Maximum Number of Vowels in a Substring of Given Length	Medium	String, Sliding_Window	215	97.25
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	String, String_Matching	155	42.86
1453	Maximum Number of Darts Inside of a Circular Dartboard	Hard	Array, Math, Geometry	211	100.00
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium	Array, String, Hash_Table	600	100.00
1451	Rearrange Words in a Sentence	Medium	String, Sorting	263	100.00
1450	Number of Students Doing Homework at a Given Time	Easy	Array	144	88.89
1449	Form Largest Integer With Digits That Add up to Target	Hard	Array, Dynamic_Programming	201	100.00
1448	Count Good Nodes in Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	384	68.52
1447	Simplified Fractions	Medium	String, Math, Number_Theory	338	100.00
1446	Consecutive Characters	Easy	String	141	100.00
1444	Number of Ways of Cutting a Pizza	Hard	Array, Dynamic_Programming, Matrix, Memoization	175	75.00
1443	Minimum Time to Collect All Apples in a Tree	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree	793	85.71
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Medium	Array, Hash_Table, Math, Bit_Manipulation, Prefix_Sum	145	100.00
1441	Build an Array With Stack Operations	Medium	Array, Stack, Simulation	160	100.00
1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard	Array, Binary_Search, Matrix, Heap_Priority_Queue	225	100.00
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	Array, Heap_Priority_Queue, Sliding_Window, Ordered_Set, Queue, Monotonic_Queue	479	75.00
1437	Check If All 1’s Are at Least Length K Places Away	Easy	Array	345	66.67
1436	Destination City	Easy	String, Hash_Table	174	77.78
1434	Number of Ways to Wear Different Hats to Each Other	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	206	100.00
1433	Check If a String Can Break Another String	Medium	String, Sorting, Greedy	221	100.00
1432	Max Difference You Can Get From Changing an Integer	Medium	Math, Greedy	147	100.00
1431	Kids With the Greatest Number of Candies	Easy	Array	152	99.61
1425	Constrained Subsequence Sum	Hard	Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue	649	33.33
1424	Diagonal Traverse II	Medium	Array, Sorting, Heap_Priority_Queue	706	100.00
1423	Maximum Points You Can Obtain from Cards	Medium	Array, Prefix_Sum, Sliding_Window	349	78.57
1422	Maximum Score After Splitting a String	Easy	String	145	100.00
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	Hard	Dynamic_Programming	153	100.00
1419	Minimum Number of Frogs Croaking	Medium	String, Counting	210	90.91
1418	Display Table of Food Orders in a Restaurant	Medium	Array, String, Hash_Table, Sorting, Ordered_Set	710	100.00
1417	Reformat The String	Easy	String	174	100.00
1416	Restore The Array	Hard	String, Dynamic_Programming	279	51.85
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium	String, Backtracking	160	100.00
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Medium	Greedy	165	100.00
1413	Minimum Value to Get Positive Step by Step Sum	Easy	Array, Prefix_Sum	127	97.22
1411	Number of Ways to Paint N × 3 Grid	Hard	Dynamic_Programming	201	100.00
1410	HTML Entity Parser	Medium	String, Hash_Table	334	100.00
1409	Queries on a Permutation With Key	Medium	Array, Simulation, Binary_Indexed_Tree	209	100.00
1408	String Matching in an Array	Easy	String, String_Matching	194	77.78
1407	Top Travellers	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_9_Control_of_Flow	1394	98.43
1406	Stone Game III	Hard	Array, Dynamic_Programming, Math, Game_Theory	699	90.70
1405	Longest Happy String	Medium	String, Greedy, Heap_Priority_Queue	119	100.00
1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium	String, Bit_Manipulation	144	100.00
1403	Minimum Subsequence in Non-Increasing Order	Easy	Array, Sorting, Greedy	190	100.00
1402	Reducing Dishes	Hard	Array, Dynamic_Programming, Sorting, Greedy	151	100.00
1401	Circle and Rectangle Overlapping	Medium	Math, Geometry	116	100.00
1400	Construct K Palindrome Strings	Medium	String, Hash_Table, Greedy, Counting	204	90.00
1399	Count Largest Group	Easy	Hash_Table, Math	136	100.00
1397	Find All Good Strings	Hard	String, Dynamic_Programming, String_Matching	273	100.00
1396	Design Underground System	Medium	String, Hash_Table, Design	703	99.29
1395	Count Number of Teams	Medium	Array, Dynamic_Programming, Binary_Indexed_Tree	192	100.00
1394	Find Lucky Integer in an Array	Easy	Array, Hash_Table, Counting	161	100.00
1393	Capital Gain/Loss	Medium	LeetCode_Curated_SQL_70, Database, SQL_I_Day_9_Control_of_Flow	990	47.36
1392	Longest Happy Prefix	Hard	String, Hash_Function, String_Matching, Rolling_Hash	291	50.00
1391	Check if There is a Valid Path in a Grid	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	636	100.00
1390	Four Divisors	Medium	Array, Math	255	100.00
1389	Create Target Array in the Given Order	Easy	Array, Simulation	155	91.67
1388	Pizza With 3n Slices	Hard	Array, Dynamic_Programming, Greedy, Heap_Priority_Queue	170	100.00
1387	Sort Integers by The Power Value	Medium	Dynamic_Programming, Sorting, Memoization	370	100.00
1386	Cinema Seat Allocation	Medium	Array, Hash_Table, Greedy, Bit_Manipulation	397	100.00
1385	Find the Distance Value Between Two Arrays	Easy	Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_3	190	84.62
1383	Maximum Performance of a Team	Hard	Array, Sorting, Greedy, Heap_Priority_Queue	427	100.00
1382	Balance a Binary Search Tree	Medium	Depth_First_Search, Greedy, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer	369	85.71
1381	Design a Stack With Increment Operation	Medium	Array, Stack, Design	267	100.00
1380	Lucky Numbers in a Matrix	Easy	Array, Matrix	223	89.29
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	1	100.00
1378	Replace Employee ID With The Unique Identifier	Easy	Database	2452	54.86
1377	Frog Position After T Seconds	Hard	Depth_First_Search, Breadth_First_Search, Tree, Graph	221	100.00
1376	Time Needed to Inform All Employees	Medium	Depth_First_Search, Breadth_First_Search, Tree, Programming_Skills_II_Day_11, Graph_Theory_I_Day_9_Standard_Traversal	915	37.62
1375	Number of Times Binary String Is Prefix-Aligned	Medium	Array	327	100.00
1374	Generate a String With Characters That Have Odd Counts	Easy	String	130	100.00
1373	Maximum Sum BST in Binary Tree	Hard	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	451	100.00
1372	Longest ZigZag Path in a Binary Tree	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree	381	66.11
1371	Find the Longest Substring Containing Vowels in Even Counts	Medium	String, Hash_Table, Bit_Manipulation, Prefix_Sum	317	100.00
1370	Increasing Decreasing String	Easy	String, Hash_Table, Counting	189	33.33
1368	Minimum Cost to Make at Least One Valid Path in a Grid	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path	220	100.00
1367	Linked List in Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Programming_Skills_II_Day_4	237	92.86
1366	Rank Teams by Votes	Medium	Array, String, Hash_Table, Sorting, Counting	179	100.00
1365	How Many Numbers Are Smaller Than the Current Number	Easy	Array, Hash_Table, Sorting, Counting	193	93.33
1363	Largest Multiple of Three	Hard	Array, Dynamic_Programming, Greedy	267	100.00
1362	Closest Divisors	Medium	Math	167	100.00
1361	Validate Binary Tree Nodes	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Graph, Union_Find	316	83.33
1360	Number of Days Between Two Dates	Easy	String, Math	166	100.00
1359	Count All Valid Pickup and Delivery Options	Hard	Dynamic_Programming, Math, Combinatorics	121	100.00
1358	Number of Substrings Containing All Three Characters	Medium	String, Hash_Table, Sliding_Window	196	100.00
1357	Apply Discount Every n Orders	Medium	Array, Hash_Table, Design	967	100.00
1356	Sort Integers by The Number of 1 Bits	Easy	Array, Sorting, Bit_Manipulation, Counting, Programming_Skills_I_Day_11_Containers_and_Libraries	236	92.31
1354	Construct Target Array With Multiple Sums	Hard	Array, Heap_Priority_Queue	289	100.00
1353	Maximum Number of Events That Can Be Attended	Medium	Array, Greedy, Heap_Priority_Queue	728	100.00
1352	Product of the Last K Numbers	Medium	Array, Math, Design, Queue, Data_Stream	563	100.00
1351	Count Negative Numbers in a Sorted Matrix	Easy	Array, Binary_Search, Matrix, Binary_Search_I_Day_8	206	71.43
1349	Maximum Students Taking Exam	Hard	Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask	173	100.00
1348	Tweet Counts Per Frequency	Medium	Hash_Table, Sorting, Binary_Search, Design, Ordered_Set	701	100.00
1347	Minimum Number of Steps to Make Two Strings Anagram	Medium	String, Hash_Table, Counting	250	67.35
1346	Check If N and Its Double Exist	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_9	175	70.83
1345	Jump Game IV	Hard	Array, Hash_Table, Breadth_First_Search	599	100.00
1344	Angle Between Hands of a Clock	Medium	Math	118	83.33
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Medium	Array, Sliding_Window	394	84.62
1342	Number of Steps to Reduce a Number to Zero	Easy	Math, Bit_Manipulation	124	83.18
1341	Movie Rating	Medium	Database	2843	48.31
1340	Jump Game V	Hard	Array, Dynamic_Programming, Sorting	208	100.00
1339	Maximum Product of Splitted Binary Tree	Medium	Depth_First_Search, Tree, Binary_Tree	384	100.00
1338	Reduce Array Size to The Half	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue	579	71.43
1337	The K Weakest Rows in a Matrix	Easy	Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue, Binary_Search_I_Day_9	216	77.59
1335	Minimum Difficulty of a Job Schedule	Hard	Array, Dynamic_Programming	154	100.00
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	Dynamic_Programming, Graph, Shortest_Path	223	88.89
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Medium	Array, Sorting	326	100.00
1332	Remove Palindromic Subsequences	Easy	String, Two_Pointers	122	83.33
1331	Rank Transform of an Array	Easy	Array, Hash_Table, Sorting	553	100.00
1330	Reverse Subarray To Maximize Array Value	Hard	Array, Math, Greedy	347	100.00
1329	Sort the Matrix Diagonally	Medium	Array, Sorting, Matrix	243	100.00
1328	Break a Palindrome	Medium	String, Greedy	137	81.82
1327	List the Products Ordered in a Period	Easy	Database	1324	61.30
1326	Minimum Number of Taps to Open to Water a Garden	Hard	Array, Dynamic_Programming, Greedy	189	100.00
1325	Delete Leaves With a Given Value	Medium	Depth_First_Search, Tree, Binary_Tree	185	100.00
1324	Print Words Vertically	Medium	Array, String, Simulation	149	66.67
1323	Maximum 69 Number	Easy	Math, Greedy	118	90.00
1321	Restaurant Growth	Medium	Database	630	83.05
1320	Minimum Distance to Type a Word Using Two Fingers	Hard	String, Dynamic_Programming	181	100.00
1319	Number of Operations to Make Network Connected	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_8_Standard_Traversal	379	83.33
1318	Minimum Flips to Make a OR b Equal to c	Medium	Bit_Manipulation	123	88.89
1317	Convert Integer to the Sum of Two No-Zero Integers	Easy	Math	146	100.00
1316	Distinct Echo Substrings	Hard	String, Dynamic_Programming, Sliding_Window, Trie, Hash_Function, Rolling_Hash	371	100.00
1315	Sum of Nodes with Even-Valued Grandparent	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	257	82.35
1314	Matrix Block Sum	Medium	Array, Matrix, Prefix_Sum, Dynamic_Programming_I_Day_14	235	100.00
1313	Decompress Run-Length Encoded List	Easy	Array	196	100.00
1312	Minimum Insertion Steps to Make a String Palindrome	Hard	String, Dynamic_Programming	186	67.70
1311	Get Watched Videos by Your Friends	Medium	Array, Hash_Table, Sorting, Breadth_First_Search	372	100.00
1310	XOR Queries of a Subarray	Medium	Array, Bit_Manipulation, Prefix_Sum	382	100.00
1309	Decrypt String from Alphabet to Integer Mapping	Easy	String, Programming_Skills_I_Day_9_String	129	95.45
1307	Verbal Arithmetic Puzzle	Hard	Array, String, Math, Backtracking	164	100.00
1306	Jump Game III	Medium	Array, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search, Udemy_Arrays	291	100.00
1305	All Elements in Two Binary Search Trees	Medium	Sorting, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	531	100.00
1304	Find N Unique Integers Sum up to Zero	Easy	Array, Math	142	100.00
1302	Deepest Leaves Sum	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	325	67.39
1301	Number of Paths with Max Score	Hard	Array, Dynamic_Programming, Matrix	178	100.00
1300	Sum of Mutated Array Closest to Target	Medium	Array, Sorting, Binary_Search, Binary_Search_II_Day_16	217	100.00
1299	Replace Elements with Greatest Element on Right Side	Easy	Array	514	79.69
1298	Maximum Candies You Can Get from Boxes	Hard	Array, Breadth_First_Search	442	80.00
1297	Maximum Number of Occurrences of a Substring	Medium	String, Hash_Table, Sliding_Window	253	75.00
1296	Divide Array in Sets of K Consecutive Numbers	Medium	Array, Hash_Table, Sorting, Greedy	488	100.00
1295	Find Numbers with Even Number of Digits	Easy	Array	189	35.85
1293	Shortest Path in a Grid with Obstacles Elimination	Hard	Array, Breadth_First_Search, Matrix	189	100.00
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Medium	Array, Binary_Search, Matrix, Prefix_Sum, Binary_Search_II_Day_15	376	100.00
1291	Sequential Digits	Medium	Enumeration, Udemy_Arrays	114	100.00
1290	Convert Binary Number in a Linked List to Integer	Easy	Math, Linked_List, Programming_Skills_I_Day_10_Linked_List_and_Tree	138	65.79
1289	Minimum Falling Path Sum II	Hard	Array, Dynamic_Programming, Matrix	234	100.00
1288	Remove Covered Intervals	Medium	Array, Sorting	184	100.00
1287	Element Appearing More Than 25% In Sorted Array	Easy	Array	199	100.00
1286	Iterator for Combination	Medium	String, Design, Backtracking, Iterator	236	100.00
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard	Array, Breadth_First_Search, Matrix, Bit_Manipulation	131	100.00
1283	Find the Smallest Divisor Given a Threshold	Medium	Array, Binary_Search, Binary_Search_II_Day_5	255	100.00
1282	Group the People Given the Group Size They Belong To	Medium	Array, Hash_Table	267	100.00
1281	Subtract the Product and Sum of Digits of an Integer	Easy	Math, Programming_Skills_I_Day_2_Operator	128	61.82
1280	Students and Examinations	Easy	Database	1552	85.96
1278	Palindrome Partitioning III	Hard	String, Dynamic_Programming	137	100.00
1277	Count Square Submatrices with All Ones	Medium	Array, Dynamic_Programming, Matrix	381	75.00
1276	Number of Burgers with No Waste of Ingredients	Medium	Math	190	50.00
1275	Find Winner on a Tic Tac Toe Game	Easy	Array, Hash_Table, Matrix, Simulation	125	87.50
1269	Number of Ways to Stay in the Same Place After Some Steps	Hard	Dynamic_Programming	159	50.00
1268	Search Suggestions System	Medium	Array, String	331	100.00
1267	Count Servers that Communicate	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Counting, Union_Find	295	100.00
1266	Minimum Time Visiting All Points	Easy	Array, Math, Geometry	152	100.00
1263	Minimum Moves to Move a Box to Their Target Location	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue	183	100.00
1262	Greatest Sum Divisible by Three	Medium	Array, Dynamic_Programming, Greedy	263	100.00
1261	Find Elements in a Contaminated Binary Tree	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design	287	100.00
1260	Shift 2D Grid	Easy	Array, Matrix, Simulation	302	100.00
1255	Maximum Score Words Formed by Letters	Hard	Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	131	100.00
1254	Number of Closed Islands	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_2_Matrix_Related_Problems	177	89.47
1253	Reconstruct a 2-Row Binary Matrix	Medium	Array, Greedy, Matrix	496	75.00
1252	Cells with Odd Values in a Matrix	Easy	Array, Math, Simulation	134	100.00
1251	Average Selling Price	Easy	Database	1371	76.11
1250	Check If It Is a Good Array	Hard	Array, Math, Number_Theory	334	100.00
1249	Minimum Remove to Make Valid Parentheses	Medium	String, Stack, Data_Structure_II_Day_14_Stack_Queue	218	100.00
1248	Count Number of Nice Subarrays	Medium	Array, Hash_Table, Math, Sliding_Window	431	93.33
1247	Minimum Swaps to Make Strings Equal	Medium	String, Math, Greedy	134	66.67
1240	Tiling a Rectangle with the Fewest Squares	Hard	Dynamic_Programming, Backtracking	134	75.00
1239	Maximum Length of a Concatenated String with Unique Characters	Medium	Array, String, Bit_Manipulation, Backtracking	166	50.00
1238	Circular Permutation in Binary Representation	Medium	Math, Bit_Manipulation, Backtracking	296	100.00
1237	Find Positive Integer Solution for a Given Equation	Medium	Math, Binary_Search, Two_Pointers, Interactive	176	36.36
1235	Maximum Profit in Job Scheduling	Hard	Array, Dynamic_Programming, Sorting, Binary_Search	370	100.00
1234	Replace the Substring for Balanced String	Medium	String, Sliding_Window	182	100.00
1233	Remove Sub-Folders from the Filesystem	Medium	Array, String, Trie	459	40.00
1232	Check If It Is a Straight Line	Easy	Array, Math, Geometry, Programming_Skills_I_Day_5_Function	152	95.38
1227	Airplane Seat Assignment Probability	Medium	Dynamic_Programming, Math, Brainteaser, Probability_and_Statistics	135	100.00
1226	The Dining Philosophers	Medium	Concurrency	12	95.88
1224	Maximum Equal Frequency	Hard	Array, Hash_Table	330	100.00
1223	Dice Roll Simulation	Hard	Array, Dynamic_Programming	146	100.00
1222	Queens That Can Attack the King	Medium	Array, Matrix, Simulation	189	50.00
1221	Split a String in Balanced Strings	Easy	String, Greedy, Counting	131	67.65
1220	Count Vowels Permutation	Hard	Dynamic_Programming	129	100.00
1219	Path with Maximum Gold	Medium	Array, Matrix, Backtracking	238	100.00
1218	Longest Arithmetic Subsequence of Given Difference	Medium	Array, Hash_Table, Dynamic_Programming	420	100.00
1217	Minimum Cost to Move Chips to The Same Position	Easy	Array, Math, Greedy	119	100.00
1211	Queries Quality and Percentage	Easy	Database	1176	80.10
1210	Minimum Moves to Reach Target with Rotations	Hard	Array, Breadth_First_Search, Matrix	230	100.00
1209	Remove All Adjacent Duplicates in String II	Medium	String, Stack	223	100.00
1208	Get Equal Substrings Within Budget	Medium	String, Binary_Search, Prefix_Sum, Sliding_Window	163	100.00
1207	Unique Number of Occurrences	Easy	Array, Hash_Table	151	83.00
1206	Design Skiplist	Hard	Design, Linked_List	306	100.00
1204	Last Person to Fit in the Bus	Medium	Database	1476	82.95
1203	Sort Items by Groups Respecting Dependencies	Hard	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	503	100.00
1202	Smallest String With Swaps	Medium	String, Hash_Table, Depth_First_Search, Breadth_First_Search, Union_Find	562	100.00
1201	Ugly Number III	Medium	Math, Binary_Search, Number_Theory, Binary_Search_II_Day_20	136	100.00
1200	Minimum Absolute Difference	Easy	Array, Sorting	507	75.00
1195	Fizz Buzz Multithreaded	Medium	Concurrency	6	87.26
1193	Monthly Transactions I	Medium	Database	891	92.73
1192	Critical Connections in a Network	Hard	Depth_First_Search, Graph, Biconnected_Component	1696	60.00
1191	K-Concatenation Maximum Sum	Medium	Array, Dynamic_Programming	389	100.00
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	String, Stack	153	42.86
1189	Maximum Number of Balloons	Easy	String, Hash_Table, Counting	136	98.31
1187	Make Array Strictly Increasing	Hard	Array, Dynamic_Programming, Binary_Search	308	100.00
1186	Maximum Subarray Sum with One Deletion	Medium	Array, Dynamic_Programming	304	50.00
1185	Day of the Week	Easy	Math	127	50.00
1184	Distance Between Bus Stops	Easy	Array	164	57.14
1179	Reformat Department Table	Easy	Database	815	90.95
1178	Number of Valid Words for Each Puzzle	Hard	Array, String, Hash_Table, Bit_Manipulation, Trie	675	100.00
1177	Can Make Palindrome from Substring	Medium	String, Hash_Table, Bit_Manipulation, Prefix_Sum	937	100.00
1175	Prime Arrangements	Easy	Math	129	50.00
1174	Immediate Food Delivery II	Medium	Database	981	97.51
1172	Dinner Plate Stacks	Hard	Hash_Table, Stack, Design, Heap_Priority_Queue	1160	50.00
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium	Hash_Table, Linked_List	194	50.00
1170	Compare Strings by Frequency of the Smallest Character	Medium	Array, String, Hash_Table, Sorting, Binary_Search	221	50.00
1169	Invalid Transactions	Medium	Array, String, Hash_Table, Sorting	362	57.14
1164	Product Price at a Given Date	Medium	Database	774	91.86
1163	Last Substring in Lexicographical Order	Hard	String, Two_Pointers	254	100.00
1162	As Far from Land as Possible	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems	362	81.25
1161	Maximum Level Sum of a Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	445	87.50
1160	Find Words That Can Be Formed by Characters	Easy	Array, String, Hash_Table	288	72.22
1158	Market Analysis I	Medium	Database, SQL_I_Day_9_Control_of_Flow	2470	44.76
1157	Online Majority Element In Subarray	Hard	Array, Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree	953	100.00
1156	Swap For Longest Repeated Character Substring	Medium	String, Sliding_Window	198	100.00
1155	Number of Dice Rolls With Target Sum	Medium	Dynamic_Programming	158	80.95
1154	Day of the Year	Easy	String, Math	317	70.00
1148	Article Views I	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_5_Union	806	54.41
1147	Longest Chunked Palindrome Decomposition	Hard	String, Dynamic_Programming, Greedy, Two_Pointers, Hash_Function, Rolling_Hash	148	50.00
1146	Snapshot Array	Medium	Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_18	1064	57.14
1145	Binary Tree Coloring Game	Medium	Depth_First_Search, Tree, Binary_Tree	181	100.00
1144	Decrease Elements To Make Array Zigzag	Medium	Array, Greedy	144	100.00
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	307	38.36
1141	User Activity for the Past 30 Days I	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_7_Function	790	87.11
1140	Stone Game II	Medium	Array, Dynamic_Programming, Math, Game_Theory	166	93.27
1139	Largest 1-Bordered Square	Medium	Array, Dynamic_Programming, Matrix	224	100.00
1138	Alphabet Board Path	Medium	String, Hash_Table	138	100.00
1137	N-th Tribonacci Number	Easy	Dynamic_Programming, Math, Memoization, Dynamic_Programming_I_Day_1	122	69.35
1131	Maximum of Absolute Value Expression	Medium	Array, Math	333	100.00
1130	Minimum Cost Tree From Leaf Values	Medium	Dynamic_Programming, Greedy, Stack, Monotonic_Stack	145	66.67
1129	Shortest Path with Alternating Colors	Medium	Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal	208	80.00
1128	Number of Equivalent Domino Pairs	Easy	Array, Hash_Table, Counting	289	80.00
1125	Smallest Sufficient Team	Hard	Array, Dynamic_Programming, Bit_Manipulation, Bitmask	181	100.00
1124	Longest Well-Performing Interval	Medium	Array, Hash_Table, Stack, Prefix_Sum, Monotonic_Stack	313	100.00
1123	Lowest Common Ancestor of Deepest Leaves	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	221	66.67
1122	Relative Sort Array	Easy	Array, Hash_Table, Sorting, Counting_Sort	183	90.00
1117	Building H2O	Medium	Concurrency	20	45.16
1116	Print Zero Even Odd	Medium	Concurrency	7	39.21
1115	Print FooBar Alternately	Medium	Concurrency	23	71.25
1114	Print in Order	Easy	Concurrency	13	30.13
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Medium	String, Stack	207	33.33
1110	Delete Nodes And Return Forest	Medium	Depth_First_Search, Tree, Binary_Tree	223	100.00
1109	Corporate Flight Bookings	Medium	Array, Prefix_Sum	719	100.00
1108	Defanging an IP Address	Easy	String	159	62.10
1106	Parsing A Boolean Expression	Hard	String, Stack, Recursion	205	100.00
1105	Filling Bookcase Shelves	Medium	Array, Dynamic_Programming	175	33.33
1104	Path In Zigzag Labelled Binary Tree	Medium	Math, Tree, Binary_Tree	136	100.00
1103	Distribute Candies to People	Easy	Math, Simulation	129	100.00
1096	Brace Expansion II	Hard	String, Breadth_First_Search, Stack, Backtracking	205	100.00
1095	Find in Mountain Array	Hard	Array, Binary_Search, Interactive	173	100.00
1094	Car Pooling	Medium	Array, Sorting, Heap_Priority_Queue, Simulation, Prefix_Sum	172	81.82
1093	Statistics from a Large Sample	Medium	Math, Two_Pointers, Probability_and_Statistics	191	100.00
1092	Shortest Common Supersequence	Hard	String, Dynamic_Programming	174	100.00
1091	Shortest Path in Binary Matrix	Medium	Array, Breadth_First_Search, Matrix, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems	305	98.28
1090	Largest Values From Labels	Medium	Array, Hash_Table, Sorting, Greedy, Counting	281	100.00
1089	Duplicate Zeros	Easy	Array, Two_Pointers	185	93.60
1084	Sales Analysis III	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where	1881	79.36
1081	Smallest Subsequence of Distinct Characters	Medium	String, Greedy, Stack, Monotonic_Stack	146	100.00
1080	Insufficient Nodes in Root to Leaf Paths	Medium	Depth_First_Search, Tree, Binary_Tree	271	100.00
1079	Letter Tile Possibilities	Medium	String, Backtracking	144	100.00
1078	Occurrences After Bigram	Easy	String	151	88.24
1075	Project Employees I	Easy	Database	1268	94.71
1074	Number of Submatrices That Sum to Target	Hard	Array, Hash_Table, Matrix, Prefix_Sum	770	100.00
1073	Adding Two Negabinary Numbers	Medium	Array, Math	187	100.00
1072	Flip Columns For Maximum Number of Equal Rows	Medium	Array, Hash_Table, Matrix	536	100.00
1071	Greatest Common Divisor of Strings	Easy	String, Math	150	80.68
1070	Product Sales Analysis III	Medium	Database	1561	95.47
1068	Product Sales Analysis I	Easy	Database	1897	79.88
1061	Lexicographically Smallest Equivalent String	Medium	String, Union_Find	166	100.00
1054	Distant Barcodes	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	622	75.00
1053	Previous Permutation With One Swap	Medium	Array, Greedy	288	100.00
1052	Grumpy Bookstore Owner	Medium	Array, Sliding_Window	268	80.00
1051	Height Checker	Easy	Array, Sorting, Counting_Sort	140	94.37
1050	Actors and Directors Who Cooperated At Least Three Times	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where	629	81.02
1049	Last Stone Weight II	Medium	Array, Dynamic_Programming	150	100.00
1048	Longest String Chain	Medium	Array, String, Hash_Table, Dynamic_Programming, Two_Pointers	273	75.00
1047	Remove All Adjacent Duplicates In String	Easy	String, Stack	228	94.52
1046	Last Stone Weight	Easy	Array, Heap_Priority_Queue, Level_1_Day_15_Heap	123	100.00
1045	Customers Who Bought All Products	Medium	Database	881	90.47
1044	Longest Duplicate Substring	Hard	String, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash, Suffix_Array	592	100.00
1043	Partition Array for Maximum Sum	Medium	Array, Dynamic_Programming	194	71.43
1042	Flower Planting With No Adjacent	Medium	Depth_First_Search, Breadth_First_Search, Graph	396	85.71
1041	Robot Bounded In Circle	Medium	String, Math, Simulation	121	100.00
1040	Moving Stones Until Consecutive II	Medium	Array, Math, Sorting, Two_Pointers	287	50.00
1039	Minimum Score Triangulation of Polygon	Medium	Array, Dynamic_Programming	147	100.00
1038	Binary Search Tree to Greater Sum Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	123	91.67
1037	Valid Boomerang	Easy	Array, Math, Geometry	126	100.00
1036	Escape a Large Maze	Hard	Array, Hash_Table, Depth_First_Search, Breadth_First_Search	387	100.00
1035	Uncrossed Lines	Medium	Array, Dynamic_Programming	162	93.33
1034	Coloring A Border	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	332	100.00
1033	Moving Stones Until Consecutive	Medium	Math, Brainteaser	139	100.00
1032	Stream of Characters	Hard	Array, String, Design, Trie, Data_Stream	733	100.00
1031	Maximum Sum of Two Non-Overlapping Subarrays	Medium	Array, Dynamic_Programming, Sliding_Window	172	100.00
1030	Matrix Cells in Distance Order	Easy	Array, Math, Sorting, Matrix, Geometry	426	100.00
1029	Two City Scheduling	Medium	Array, Sorting, Greedy	148	100.00
1028	Recover a Tree From Preorder Traversal	Hard	String, Depth_First_Search, Tree, Binary_Tree	246	100.00
1027	Longest Arithmetic Subsequence	Medium	Array, Hash_Table, Dynamic_Programming, Binary_Search	330	100.00
1026	Maximum Difference Between Node and Ancestor	Medium	Depth_First_Search, Tree, Binary_Tree	155	77.78
1025	Divisor Game	Easy	Dynamic_Programming, Math, Game_Theory, Brainteaser	114	93.33
1024	Video Stitching	Medium	Array, Dynamic_Programming, Greedy	141	100.00
1023	Camelcase Matching	Medium	String, Two_Pointers, Trie, String_Matching	149	60.00
1022	Sum of Root To Leaf Binary Numbers	Easy	Depth_First_Search, Tree, Binary_Tree	158	88.89
1021	Remove Outermost Parentheses	Easy	String, Stack	156	60.00
1020	Number of Enclaves	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems	283	90.70
1019	Next Greater Node In Linked List	Medium	Array, Stack, Linked_List, Monotonic_Stack	472	75.00
1018	Binary Prefix Divisible By 5	Easy	Array	297	100.00
1017	Convert to Base -2	Medium	Math	138	100.00
1016	Binary String With Substrings Representing 1 To N	Medium	String	134	75.00
1015	Smallest Integer Divisible by K	Medium	Hash_Table, Math	123	100.00
1014	Best Sightseeing Pair	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_7	336	66.67
1013	Partition Array Into Three Parts With Equal Sum	Easy	Array, Greedy	328	100.00
1012	Numbers With Repeated Digits	Hard	Dynamic_Programming, Math	123	100.00
1011	Capacity To Ship Packages Within D Days	Medium	Array, Binary_Search	325	66.67
1010	Pairs of Songs With Total Durations Divisible by 60	Medium	Array, Hash_Table, Counting	287	77.78
1009	Complement of Base 10 Integer	Easy	Bit_Manipulation, Udemy_Bit_Manipulation	126	72.73
1008	Construct Binary Search Tree from Preorder Traversal	Medium	Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree, Udemy_Tree_Stack_Queue	145	100.00
1007	Minimum Domino Rotations For Equal Row	Medium	Array, Greedy, Udemy_Arrays	421	50.00
1006	Clumsy Factorial	Medium	Math, Stack, Simulation	127	100.00
1005	Maximize Sum Of Array After K Negations	Easy	Array, Sorting, Greedy	167	100.00
1004	Max Consecutive Ones III	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window	318	30.95
1003	Check If Word Is Valid After Substitutions	Medium	String, Stack	216	100.00
1002	Find Common Characters	Easy	Array, String, Hash_Table	181	100.00
1001	Grid Illumination	Hard	Array, Hash_Table	801	100.00
1000	Minimum Cost to Merge Stones	Hard	Array, Dynamic_Programming	152	75.00
0999	Available Captures for Rook	Easy	Array, Matrix, Simulation	143	80.00
0998	Maximum Binary Tree II	Medium	Tree, Binary_Tree	157	100.00
0997	Find the Town Judge	Easy	Array, Hash_Table, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory	475	58.62
0996	Number of Squareful Arrays	Hard	Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask	139	100.00
0995	Minimum Number of K Consecutive Bit Flips	Hard	Array, Bit_Manipulation, Prefix_Sum, Sliding_Window	480	100.00
0994	Rotting Oranges	Medium	Top_100_Liked_Questions, Array, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Level_2_Day_10_Graph/BFS/DFS	164	82.95
0993	Cousins in Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	152	71.43
0992	Subarrays with K Different Integers	Hard	Array, Hash_Table, Counting, Sliding_Window	341	87.50
0991	Broken Calculator	Medium	Math, Greedy	127	100.00
0990	Satisfiability of Equality Equations	Medium	Array, String, Graph, Union_Find	163	100.00
0989	Add to Array-Form of Integer	Easy	Array, Math, Programming_Skills_II_Day_5	350	70.00
0988	Smallest String Starting From Leaf	Medium	String, Depth_First_Search, Tree, Binary_Tree	180	100.00
0987	Vertical Order Traversal of a Binary Tree	Hard	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	189	66.67
0986	Interval List Intersections	Medium	Array, Two_Pointers, Algorithm_II_Day_4_Two_Pointers	318	60.98
0985	Sum of Even Numbers After Queries	Medium	Array, Simulation	497	71.43
0984	String Without AAA or BBB	Medium	String, Greedy	132	66.67
0983	Minimum Cost For Tickets	Medium	Array, Dynamic_Programming	147	92.80
0982	Triples with Bitwise AND Equal To Zero	Hard	Array, Hash_Table, Bit_Manipulation	227	100.00
0981	Time Based Key-Value Store	Medium	String, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_16	1011	65.56
0980	Unique Paths III	Hard	Array, Matrix, Bit_Manipulation, Backtracking	134	100.00
0979	Distribute Coins in Binary Tree	Medium	Depth_First_Search, Tree, Binary_Tree	165	80.00
0978	Longest Turbulent Subarray	Medium	Array, Dynamic_Programming, Sliding_Window	395	40.00
0977	Squares of a Sorted Array	Easy	Array, Sorting, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Two_Pointers	271	77.17
0976	Largest Perimeter Triangle	Easy	Array, Math, Sorting, Greedy, Programming_Skills_I_Day_3_Conditional_Statements	304	33.33
0975	Odd Even Jump	Hard	Array, Dynamic_Programming, Stack, Ordered_Set, Monotonic_Stack	326	100.00
0974	Subarray Sums Divisible by K	Medium	Array, Hash_Table, Prefix_Sum	334	66.67
0973	K Closest Points to Origin	Medium	Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect, Data_Structure_II_Day_21_Heap_Priority_Queue, Programming_Skills_II_Day_8	800	37.89
0972	Equal Rational Numbers	Hard	String, Math	130	100.00
0971	Flip Binary Tree To Match Preorder Traversal	Medium	Depth_First_Search, Tree, Binary_Tree	173	66.67
0970	Powerful Integers	Medium	Hash_Table, Math	136	100.00
0969	Pancake Sorting	Medium	Array, Sorting, Greedy, Two_Pointers	169	100.00
0968	Binary Tree Cameras	Hard	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	176	100.00
0967	Numbers With Same Consecutive Differences	Medium	Breadth_First_Search, Backtracking	144	100.00
0966	Vowel Spellchecker	Medium	Array, String, Hash_Table	371	100.00
0965	Univalued Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	138	90.91
0964	Least Operators to Express Number	Hard	Dynamic_Programming, Math	160	100.00
0963	Minimum Area Rectangle II	Medium	Array, Math, Geometry	183	100.00
0962	Maximum Width Ramp	Medium	Array, Stack, Monotonic_Stack	324	100.00
0961	N-Repeated Element in Size 2N Array	Easy	Array, Hash_Table	264	75.00
0960	Delete Columns to Make Sorted III	Hard	Array, String, Dynamic_Programming	200	100.00
0959	Regions Cut By Slashes	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	180	100.00
0958	Check Completeness of a Binary Tree	Medium	Breadth_First_Search, Tree, Binary_Tree	142	96.04
0957	Prison Cells After N Days	Medium	Array, Hash_Table, Math, Bit_Manipulation	172	100.00
0956	Tallest Billboard	Hard	Array, Dynamic_Programming	182	100.00
0955	Delete Columns to Make Sorted II	Medium	Array, String, Greedy	190	100.00
0954	Array of Doubled Pairs	Medium	Array, Hash_Table, Sorting, Greedy	462	100.00
0953	Verifying an Alien Dictionary	Easy	Array, String, Hash_Table, Programming_Skills_I_Day_9_String	137	100.00
0952	Largest Component Size by Common Factor	Hard	Array, Math, Union_Find	538	100.00
0951	Flip Equivalent Binary Trees	Medium	Depth_First_Search, Tree, Binary_Tree	150	100.00
0950	Reveal Cards In Increasing Order	Medium	Array, Sorting, Simulation, Queue	176	100.00
0949	Largest Time for Given Digits	Medium	String, Enumeration	171	100.00
0948	Bag of Tokens	Medium	Array, Sorting, Greedy, Two_Pointers	161	100.00
0947	Most Stones Removed with Same Row or Column	Medium	Depth_First_Search, Graph, Union_Find, Level_2_Day_19_Union_Find	200	100.00
0946	Validate Stack Sequences	Medium	Array, Stack, Simulation	180	74.91
0945	Minimum Increment to Make Array Unique	Medium	Array, Sorting, Greedy, Counting	427	100.00
0944	Delete Columns to Make Sorted	Easy	Array, String	221	75.00
0943	Find the Shortest Superstring	Hard	Array, String, Dynamic_Programming, Bit_Manipulation, Bitmask	1290	100.00
0942	DI String Match	Easy	Array, String, Math, Greedy, Two_Pointers	202	80.00
0941	Valid Mountain Array	Easy	Array	251	51.94
0940	Distinct Subsequences II	Hard	String, Dynamic_Programming	177	100.00
0939	Minimum Area Rectangle	Medium	Array, Hash_Table, Math, Sorting, Geometry	461	100.00
0938	Range Sum of BST	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Udemy_Tree_Stack_Queue	356	55.36
0937	Reorder Data in Log Files	Medium	Array, String, Sorting	205	81.82
0936	Stamping The Sequence	Hard	String, Greedy, Stack, Queue	196	100.00
0935	Knight Dialer	Medium	Dynamic_Programming	160	100.00
0934	Shortest Bridge	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems	301	80.95
0933	Number of Recent Calls	Easy	Design, Queue, Data_Stream	476	82.50
0932	Beautiful Array	Medium	Array, Math, Divide_and_Conquer	145	100.00
0931	Minimum Falling Path Sum	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_13	201	84.21
0930	Binary Subarrays With Sum	Medium	Array, Hash_Table, Prefix_Sum, Sliding_Window	250	93.75
0929	Unique Email Addresses	Easy	Array, String, Hash_Table	207	89.29
0928	Minimize Malware Spread II	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	716	100.00
0927	Three Equal Parts	Hard	Array, Math	303	100.00
0926	Flip String to Monotone Increasing	Medium	String, Dynamic_Programming	199	100.00
0925	Long Pressed Name	Easy	String, Two_Pointers	126	92.31
0924	Minimize Malware Spread	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	791	100.00
0923	3Sum With Multiplicity	Medium	Array, Hash_Table, Sorting, Two_Pointers, Counting	190	100.00
0922	Sort Array By Parity II	Easy	Array, Sorting, Two_Pointers	257	87.50
0921	Minimum Add to Make Parentheses Valid	Medium	String, Greedy, Stack	131	92.59
0920	Number of Music Playlists	Hard	Dynamic_Programming, Math, Combinatorics	136	100.00
0919	Complete Binary Tree Inserter	Medium	Breadth_First_Search, Tree, Binary_Tree, Design	225	100.00
0918	Maximum Sum Circular Subarray	Medium	Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue, Dynamic_Programming_I_Day_5	339	86.96
0917	Reverse Only Letters	Easy	String, Two_Pointers	126	100.00
0916	Word Subsets	Medium	Array, String, Hash_Table	397	88.89
0915	Partition Array into Disjoint Intervals	Medium	Array	510	76.92
0914	X of a Kind in a Deck of Cards	Easy	Array, Hash_Table, Math, Counting, Number_Theory	238	70.00
0913	Cat and Mouse	Hard	Dynamic_Programming, Math, Graph, Memoization, Topological_Sort, Game_Theory	211	100.00
0912	Sort an Array	Medium	Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort, Udemy_Sorting_Algorithms	606	98.48
0911	Online Election	Medium	Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_20	766	83.33
0910	Smallest Range II	Medium	Array, Math, Sorting, Greedy, Programming_Skills_II_Day_13	234	100.00
0909	Snakes and Ladders	Medium	Array, Breadth_First_Search, Matrix	203	100.00
0908	Smallest Range I	Easy	Array, Math	202	87.50
0907	Sum of Subarray Minimums	Medium	Array, Dynamic_Programming, Stack, Monotonic_Stack	341	100.00
0906	Super Palindromes	Hard	Math, Enumeration	153	100.00
0905	Sort Array By Parity	Easy	Array, Sorting, Two_Pointers	219	75.00
0904	Fruit Into Baskets	Medium	Array, Hash_Table, Sliding_Window	371	100.00
0903	Valid Permutations for DI Sequence	Hard	Dynamic_Programming	140	100.00
0902	Numbers At Most N Given Digit Set	Hard	Array, Dynamic_Programming, Math, Binary_Search	138	100.00
0901	Online Stock Span	Medium	Stack, Design, Monotonic_Stack, Data_Stream	641	75.00
0900	RLE Iterator	Medium	Array, Design, Counting, Iterator	175	83.33
0899	Orderly Queue	Hard	String, Math, Sorting	148	100.00
0898	Bitwise ORs of Subarrays	Medium	Array, Dynamic_Programming, Bit_Manipulation	812	100.00
0897	Increasing Order Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Binary_Search_Tree	128	85.71
0896	Monotonic Array	Easy	Array, Programming_Skills_II_Day_1	576	90.91
0895	Maximum Frequency Stack	Hard	Hash_Table, Stack, Design, Ordered_Set	617	100.00
0894	All Possible Full Binary Trees	Medium	Dynamic_Programming, Tree, Binary_Tree, Recursion, Memoization	257	100.00
0893	Groups of Special-Equivalent Strings	Medium	Array, String, Hash_Table	141	100.00
0892	Surface Area of 3D Shapes	Easy	Array, Math, Matrix, Geometry	180	100.00
0891	Sum of Subsequence Widths	Hard	Array, Math, Sorting	481	100.00
0890	Find and Replace Pattern	Medium	Array, String, Hash_Table	150	100.00
0889	Construct Binary Tree from Preorder and Postorder Traversal	Medium	Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	168	100.00
0888	Fair Candy Swap	Easy	Array, Hash_Table, Sorting, Binary_Search	318	100.00
0887	Super Egg Drop	Hard	Dynamic_Programming, Math, Binary_Search	119	100.00
0886	Possible Bipartition	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory	397	100.00
0885	Spiral Matrix III	Medium	Array, Matrix, Simulation	265	100.00
0884	Uncommon Words from Two Sentences	Easy	String, Hash_Table	171	100.00
0883	Projection Area of 3D Shapes	Easy	Array, Math, Matrix, Geometry	173	100.00
0882	Reachable Nodes In Subdivided Graph	Hard	Heap_Priority_Queue, Graph, Shortest_Path	434	100.00
0881	Boats to Save People	Medium	Array, Sorting, Greedy, Two_Pointers	370	96.07
0880	Decoded String at Index	Medium	String, Stack	134	100.00
0879	Profitable Schemes	Hard	Array, Dynamic_Programming	198	75.00
0878	Nth Magical Number	Hard	Math, Binary_Search	124	100.00
0877	Stone Game	Medium	Array, Dynamic_Programming, Math, Game_Theory	136	88.24
0876	Middle of the Linked List	Easy	Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Programming_Skills_I_Day_10_Linked_List_and_Tree, Level_1_Day_4_Linked_List, Udemy_Linked_List	136	76.52
0875	Koko Eating Bananas	Medium	Array, Binary_Search, Binary_Search_II_Day_4	267	93.85
0874	Walking Robot Simulation	Medium	Array, Simulation	274	100.00
0873	Length of Longest Fibonacci Subsequence	Medium	Array, Hash_Table, Dynamic_Programming	341	90.00
0872	Leaf-Similar Trees	Easy	Depth_First_Search, Tree, Binary_Tree	140	100.00
0871	Minimum Number of Refueling Stops	Hard	Array, Dynamic_Programming, Greedy, Heap_Priority_Queue	203	92.86
0870	Advantage Shuffle	Medium	Array, Sorting, Greedy	698	100.00
0869	Reordered Power of 2	Medium	Math, Sorting, Counting, Enumeration	145	87.50
0868	Binary Gap	Easy	Bit_Manipulation	142	100.00
0867	Transpose Matrix	Easy	Array, Matrix, Simulation	201	100.00
0866	Prime Palindrome	Medium	Math	143	100.00
0865	Smallest Subtree with all the Deepest Nodes	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	147	100.00
0864	Shortest Path to Get All Keys	Hard	Breadth_First_Search, Bit_Manipulation	176	100.00
0863	All Nodes Distance K in Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	147	95.83
0862	Shortest Subarray with Sum at Least K	Hard	Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue, Monotonic_Queue	563	84.62
0861	Score After Flipping Matrix	Medium	Array, Greedy, Matrix, Bit_Manipulation	135	71.43
0860	Lemonade Change	Easy	Array, Greedy, Programming_Skills_II_Day_17	413	86.96
0859	Buddy Strings	Easy	String, Hash_Table	149	91.01
0858	Mirror Reflection	Medium	Math, Geometry	120	100.00
0857	Minimum Cost to Hire K Workers	Hard	Array, Sorting, Greedy, Heap_Priority_Queue	302	100.00
0856	Score of Parentheses	Medium	String, Stack	129	84.62
0855	Exam Room	Medium	Design, Ordered_Set	644	83.33
0854	K-Similar Strings	Hard	String, Breadth_First_Search	136	100.00
0853	Car Fleet	Medium	Array, Sorting, Stack, Monotonic_Stack	757	85.29
0852	Peak Index in a Mountain Array	Medium	Array, Binary_Search, Binary_Search_I_Day_2	433	94.29
0851	Loud and Rich	Medium	Array, Depth_First_Search, Graph, Topological_Sort	347	100.00
0850	Rectangle Area II	Hard	Array, Ordered_Set, Segment_Tree, Line_Sweep	171	100.00
0849	Maximize Distance to Closest Person	Medium	Array	196	88.46
0848	Shifting Letters	Medium	Array, String	537	93.75
0847	Shortest Path Visiting All Nodes	Hard	Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask, Graph_Theory_I_Day_10_Standard_Traversal	164	100.00
0846	Hand of Straights	Medium	Array, Hash_Table, Sorting, Greedy	306	96.15
0845	Longest Mountain in Array	Medium	Array, Dynamic_Programming, Two_Pointers, Enumeration	222	100.00
0844	Backspace String Compare	Easy	String, Two_Pointers, Stack, Simulation, Algorithm_II_Day_4_Two_Pointers, Level_1_Day_14_Stack	126	98.31
0843	Guess the Word	Hard	Array, String, Math, Game_Theory, Interactive	75	100.00
0842	Split Array into Fibonacci Sequence	Medium	String, Backtracking	142	100.00
0841	Keys and Rooms	Medium	Depth_First_Search, Breadth_First_Search, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_7_Standard_Traversal	189	69.23
0840	Magic Squares In Grid	Medium	Array, Math, Matrix	149	100.00
0839	Similar String Groups	Hard	Array, String, Depth_First_Search, Breadth_First_Search, Union_Find	205	100.00
0838	Push Dominoes	Medium	String, Dynamic_Programming, Two_Pointers	270	100.00
0837	New 21 Game	Medium	Dynamic_Programming, Math, Sliding_Window, Probability_and_Statistics	144	75.00
0836	Rectangle Overlap	Easy	Math, Geometry	121	100.00
0835	Image Overlap	Medium	Array, Matrix	163	100.00
0834	Sum of Distances in Tree	Hard	Dynamic_Programming, Depth_First_Search, Tree, Graph	746	100.00
0833	Find And Replace in String	Medium	Array, String, Sorting	158	100.00
0832	Flipping an Image	Easy	Array, Matrix, Two_Pointers, Simulation	190	94.44
0831	Masking Personal Information	Medium	String	149	100.00
0830	Positions of Large Groups	Easy	String	221	100.00
0829	Consecutive Numbers Sum	Hard	Math, Enumeration	151	100.00
0828	Count Unique Characters of All Substrings of a Given String	Hard	String, Hash_Table, Dynamic_Programming	216	100.00
0827	Making A Large Island	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find	985	100.00
0826	Most Profit Assigning Work	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_11	366	100.00
0825	Friends Of Appropriate Ages	Medium	Array, Sorting, Binary_Search, Two_Pointers	278	100.00
0824	Goat Latin	Easy	String	146	100.00
0823	Binary Trees With Factors	Medium	Array, Hash_Table, Dynamic_Programming	298	100.00
0822	Card Flipping Game	Medium	Array, Hash_Table	186	100.00
0821	Shortest Distance to a Character	Easy	Array, String, Two_Pointers	168	88.00
0820	Short Encoding of Words	Medium	Array, String, Hash_Table, Trie	231	100.00
0819	Most Common Word	Easy	String, Hash_Table, Counting	211	83.33
0818	Race Car	Hard	Dynamic_Programming	123	100.00
0817	Linked List Components	Medium	Hash_Table, Linked_List	239	100.00
0816	Ambiguous Coordinates	Medium	String, Backtracking	231	100.00
0815	Bus Routes	Hard	Array, Hash_Table, Breadth_First_Search, Level_2_Day_11_Graph/BFS/DFS	429	100.00
0814	Binary Tree Pruning	Medium	Depth_First_Search, Tree, Binary_Tree	127	100.00
0813	Largest Sum of Averages	Medium	Array, Dynamic_Programming	160	100.00
0812	Largest Triangle Area	Easy	Array, Math, Geometry	156	71.43
0811	Subdomain Visit Count	Medium	Array, String, Hash_Table, Counting	220	100.00
0810	Chalkboard XOR Game	Hard	Array, Math, Bit_Manipulation, Game_Theory, Brainteaser	172	100.00
0809	Expressive Words	Medium	Array, String, Two_Pointers	158	100.00
0808	Soup Servings	Medium	Dynamic_Programming, Math, Probability_and_Statistics	112	100.00
0807	Max Increase to Keep City Skyline	Medium	Array, Greedy, Matrix	158	100.00
0806	Number of Lines To Write String	Easy	Array, String	134	100.00
0805	Split Array With Same Average	Hard	Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask	142	100.00
0804	Unique Morse Code Words	Easy	Array, String, Hash_Table	158	80.00
0803	Bricks Falling When Hit	Hard	Array, Matrix, Union_Find	742	100.00
0802	Find Eventual Safe States	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Graph_Theory_I_Day_9_Standard_Traversal	511	100.00
0801	Minimum Swaps To Make Sequences Increasing	Hard	Array, Dynamic_Programming	617	83.33
0799	Champagne Tower	Medium	Dynamic_Programming	153	100.00
0798	Smallest Rotation with Highest Score	Hard	Array, Prefix_Sum	470	100.00
0797	All Paths From Source to Target	Medium	Depth_First_Search, Breadth_First_Search, Graph, Backtracking, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_7_Standard_Traversal	232	100.00
0796	Rotate String	Easy	String, String_Matching	134	100.00
0795	Number of Subarrays with Bounded Maximum	Medium	Array, Two_Pointers	361	66.67
0794	Valid Tic-Tac-Toe State	Medium	Array, String	138	100.00
0793	Preimage Size of Factorial Zeroes Function	Hard	Math, Binary_Search	114	100.00
0792	Number of Matching Subsequences	Medium	String, Hash_Table, Sorting, Trie	346	100.00
0791	Custom Sort String	Medium	String, Hash_Table, Sorting	133	90.00
0790	Domino and Tromino Tiling	Medium	Dynamic_Programming	116	100.00
0789	Escape The Ghosts	Medium	Array, Math	187	100.00
0788	Rotated Digits	Medium	Dynamic_Programming, Math	137	80.00
0787	Cheapest Flights Within K Stops	Medium	Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path	185	99.20
0786	K-th Smallest Prime Fraction	Medium	Array, Binary_Search, Heap_Priority_Queue	165	100.00
0785	Is Graph Bipartite?	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory	215	82.35
0784	Letter Case Permutation	Medium	String, Bit_Manipulation, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking	219	84.62
0783	Minimum Distance Between BST Nodes	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	144	96.35
0782	Transform to Chessboard	Hard	Array, Math, Matrix, Bit_Manipulation	188	100.00
0781	Rabbits in Forest	Medium	Array, Hash_Table, Math, Greedy	132	100.00
0780	Reaching Points	Hard	Math	139	100.00
0779	K-th Symbol in Grammar	Medium	Math, Bit_Manipulation, Recursion	114	100.00
0778	Swim in Rising Water	Hard	Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find	190	100.00
0777	Swap Adjacent in LR String	Medium	String, Two_Pointers	188	100.00
0775	Global and Local Inversions	Medium	Array, Math	495	100.00
0773	Sliding Puzzle	Hard	Array, Breadth_First_Search, Matrix	166	100.00
0771	Jewels and Stones	Easy	String, Hash_Table	143	99.08
0770	Basic Calculator IV	Hard	String, Hash_Table, Math, Stack, Recursion	222	100.00
0769	Max Chunks To Make Sorted	Medium	Array, Sorting, Greedy, Stack, Monotonic_Stack	136	90.00
0768	Max Chunks To Make Sorted II	Hard	Array, Sorting, Greedy, Stack, Monotonic_Stack	202	100.00
0767	Reorganize String	Medium	String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting	148	100.00
0766	Toeplitz Matrix	Easy	Array, Matrix	174	100.00
0765	Couples Holding Hands	Hard	Depth_First_Search, Greedy, Breadth_First_Search, Graph, Union_Find	131	100.00
0764	Largest Plus Sign	Medium	Array, Dynamic_Programming	415	100.00
0763	Partition Labels	Medium	String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String, Big_O_Time_O(n)_Space_O(1)	235	84.75
0762	Prime Number of Set Bits in Binary Representation	Easy	Math, Bit_Manipulation	147	100.00
0761	Special Binary String	Hard	String, Recursion	128	100.00
0757	Set Intersection Size At Least Two	Hard	Array, Sorting, Greedy	298	100.00
0756	Pyramid Transition Matrix	Medium	Depth_First_Search, Breadth_First_Search, Bit_Manipulation	268	100.00
0754	Reach a Number	Medium	Math, Binary_Search	134	100.00
0753	Cracking the Safe	Hard	Depth_First_Search, Graph, Eulerian_Circuit	147	100.00
0752	Open the Lock	Medium	Array, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	310	100.00
0749	Contain Virus	Hard	Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation	201	100.00
0748	Shortest Completing Word	Easy	Array, String, Hash_Table	172	100.00
0747	Largest Number At Least Twice of Others	Easy	Array, Sorting	147	98.21
0746	Min Cost Climbing Stairs	Easy	Array, Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_11_Dynamic_Programming	171	96.76
0745	Prefix and Suffix Search	Hard	String, Design, Trie, Udemy_Trie_and_Heap	1638	100.00
0744	Find Smallest Letter Greater Than Target	Easy	Array, Binary_Search, Binary_Search_I_Day_4	162	100.00
0743	Network Delay Time	Medium	Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path	321	98.55
0741	Cherry Pickup	Hard	Array, Dynamic_Programming, Matrix	196	100.00
0740	Delete and Earn	Medium	Array, Hash_Table, Dynamic_Programming, Dynamic_Programming_I_Day_3	192	100.00
0739	Daily Temperatures	Medium	Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6, Big_O_Time_O(n)_Space_O(n)	936	80.54
0738	Monotone Increasing Digits	Medium	Math, Greedy	127	100.00
0736	Parse Lisp Expression	Hard	String, Hash_Table, Stack, Recursion	172	100.00
0735	Asteroid Collision	Medium	Array, Stack, Level_2_Day_18_Stack	243	100.00
0733	Flood Fill	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS	230	97.76
0732	My Calendar III	Hard	Binary_Search, Design, Ordered_Set, Segment_Tree	294	100.00
0731	My Calendar II	Medium	Binary_Search, Design, Ordered_Set, Segment_Tree	371	100.00
0730	Count Different Palindromic Subsequences	Hard	String, Dynamic_Programming	233	100.00
0729	My Calendar I	Medium	Binary_Search, Design, Ordered_Set, Segment_Tree, Programming_Skills_II_Day_20	378	69.70
0728	Self Dividing Numbers	Easy	Math	142	100.00
0726	Number of Atoms	Hard	String, Hash_Table, Sorting, Stack	149	100.00
0725	Split Linked List in Parts	Medium	Linked_List	162	95.00
0724	Find Pivot Index	Easy	Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum	255	88.92
0722	Remove Comments	Medium	Array, String	164	100.00
0721	Accounts Merge	Medium	Array, String, Depth_First_Search, Breadth_First_Search, Union_Find	364	100.00
0720	Longest Word in Dictionary	Medium	Array, String, Hash_Table, Sorting, Trie	209	100.00
0719	Find K-th Smallest Pair Distance	Hard	Array, Sorting, Binary_Search, Two_Pointers	172	100.00
0718	Maximum Length of Repeated Subarray	Medium	Array, Dynamic_Programming, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash	270	91.43
0717	1-bit and 2-bit Characters	Easy	Array	165	100.00
0715	Range Module	Hard	Design, Ordered_Set, Segment_Tree	638	58.33
0714	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_8	417	90.91
0713	Subarray Product Less Than K	Medium	Array, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Udemy_Arrays	336	92.11
0712	Minimum ASCII Delete Sum for Two Strings	Medium	String, Dynamic_Programming	176	100.00
0710	Random Pick with Blacklist	Hard	Hash_Table, Math, Sorting, Binary_Search, Randomized	632	100.00
0709	To Lower Case	Easy	String, Programming_Skills_I_Day_9_String	142	98.68
0707	Design Linked List	Medium	Design, Linked_List, Data_Structure_II_Day_12_Linked_List, Programming_Skills_II_Day_19, Udemy_Linked_List	243	100.00
0706	Design HashMap	Easy	Array, Hash_Table, Design, Linked_List, Hash_Function, Data_Structure_II_Day_2_Array	405	92.11
0705	Design HashSet	Easy	Array, Hash_Table, Design, Linked_List, Hash_Function	385	75.61
0704	Binary Search	Easy	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_1, Level_1_Day_7_Binary_Search, Udemy_Binary_Search	261	77.91
0703	Kth Largest Element in a Stream	Easy	Tree, Binary_Tree, Design, Heap_Priority_Queue, Binary_Search_Tree, Data_Stream	286	95.45
0701	Insert into a Binary Search Tree	Medium	Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree, Udemy_Tree_Stack_Queue	311	79.03
0700	Search in a Binary Search Tree	Easy	Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree	251	88.31
0699	Falling Squares	Hard	Array, Ordered_Set, Segment_Tree	293	100.00
0698	Partition to K Equal Sum Subsets	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization	191	100.00
0697	Degree of an Array	Easy	Array, Hash_Table, Udemy_Arrays	289	84.62
0696	Count Binary Substrings	Easy	String, Two_Pointers	222	100.00
0695	Max Area of Island	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_2_Matrix_Related_Problems	181	93.83
0693	Binary Number with Alternating Bits	Easy	Bit_Manipulation	129	100.00
0692	Top K Frequent Words	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort, Level_1_Day_15_Heap	239	81.10
0691	Stickers to Spell Word	Hard	Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	249	100.00
0690	Employee Importance	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search	255	100.00
0689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard	Array, Dynamic_Programming	248	100.00
0688	Knight Probability in Chessboard	Medium	Dynamic_Programming	144	100.00
0687	Longest Univalue Path	Medium	Depth_First_Search, Tree, Binary_Tree	303	100.00
0686	Repeated String Match	Medium	String, String_Matching	164	100.00
0685	Redundant Connection II	Hard	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	176	100.00
0684	Redundant Connection	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find	181	88.24
0682	Baseball Game	Easy	Array, Stack, Simulation	159	100.00
0680	Valid Palindrome II	Easy	String, Greedy, Two_Pointers	296	79.17
0679	24 Game	Hard	Array, Math, Backtracking	175	100.00
0678	Valid Parenthesis String	Medium	String, Dynamic_Programming, Greedy, Stack	133	100.00
0677	Map Sum Pairs	Medium	String, Hash_Table, Design, Trie	197	80.00
0676	Implement Magic Dictionary	Medium	String, Hash_Table, Design, Trie	256	100.00
0675	Cut Off Trees for Golf Event	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue	777	100.00
0674	Longest Continuous Increasing Subsequence	Easy	Array	201	84.21
0673	Number of Longest Increasing Subsequence	Medium	Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree, Algorithm_II_Day_16_Dynamic_Programming	226	91.67
0672	Bulb Switcher II	Medium	Math, Depth_First_Search, Breadth_First_Search, Bit_Manipulation	131	100.00
0671	Second Minimum Node In a Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree	128	100.00
0670	Maximum Swap	Medium	Math, Greedy	143	100.00
0669	Trim a Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	195	100.00
0668	Kth Smallest Number in Multiplication Table	Hard	Math, Binary_Search	151	100.00
0667	Beautiful Arrangement II	Medium	Array, Math	175	100.00
0665	Non-decreasing Array	Medium	Array	256	85.71
0664	Strange Printer	Hard	String, Dynamic_Programming	196	100.00
0662	Maximum Width of Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	189	75.00
0661	Image Smoother	Easy	Array, Matrix	352	100.00
0659	Split Array into Consecutive Subsequences	Medium	Array, Hash_Table, Greedy, Heap_Priority_Queue	352	100.00
0658	Find K Closest Elements	Medium	Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue, Binary_Search_II_Day_2	375	95.16
0657	Robot Return to Origin	Easy	String, Simulation	186	100.00
0655	Print Binary Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	176	100.00
0654	Maximum Binary Tree	Medium	Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Divide_and_Conquer	271	90.00
0653	Two Sum IV - Input is a BST	Easy	Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree, Data_Structure_I_Day_14_Tree	231	96.08
0652	Find Duplicate Subtrees	Medium	Hash_Table, Depth_First_Search, Tree, Binary_Tree	266	76.00
0650	2 Keys Keyboard	Medium	Dynamic_Programming, Math	115	100.00
0649	Dota2 Senate	Medium	String, Greedy, Queue	217	100.00
0648	Replace Words	Medium	Array, String, Hash_Table, Trie	392	100.00
0647	Palindromic Substrings	Medium	String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n)	266	67.83
0646	Maximum Length of Pair Chain	Medium	Array, Dynamic_Programming, Sorting, Greedy	249	100.00
0645	Set Mismatch	Easy	Array, Hash_Table, Sorting, Bit_Manipulation	246	88.46
0643	Maximum Average Subarray I	Easy	Array, Sliding_Window	494	98.65
0641	Design Circular Deque	Medium	Array, Design, Linked_List, Queue	232	100.00
0640	Solve the Equation	Medium	String, Math, Simulation	170	66.67
0639	Decode Ways II	Hard	String, Dynamic_Programming	259	100.00
0638	Shopping Offers	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization	195	100.00
0637	Average of Levels in Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	249	100.00
0636	Exclusive Time of Functions	Medium	Array, Stack	270	80.00
0633	Sum of Square Numbers	Medium	Math, Binary_Search, Two_Pointers, Binary_Search_I_Day_10	126	100.00
0632	Smallest Range Covering Elements from K Lists	Hard	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Sliding_Window	399	83.33
0630	Course Schedule III	Hard	Array, Greedy, Heap_Priority_Queue	536	100.00
0629	K Inverse Pairs Array	Hard	Dynamic_Programming	155	100.00
0628	Maximum Product of Three Numbers	Easy	Array, Math, Sorting	276	97.30
0627	Swap Salary	Easy	Database, SQL_I_Day_2_Select_and_Order	400	51.04
0626	Exchange Seats	Medium	Database	502	50.56
0623	Add One Row to Tree	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	202	100.00
0622	Design Circular Queue	Medium	Array, Design, Linked_List, Queue, Programming_Skills_II_Day_20	234	92.68
0621	Task Scheduler	Medium	Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting, Level_2_Day_5_Greedy	266	98.36
0620	Not Boring Movies	Easy	Database	305	59.80
0619	Biggest Single Number	Easy	Database	656	90.69
0617	Merge Two Binary Trees	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search	243	72.83
0611	Valid Triangle Number	Medium	Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_1	203	100.00
0610	Triangle Judgement	Easy	Database	464	72.35
0609	Find Duplicate File in System	Medium	Array, String, Hash_Table	426	100.00
0608	Tree Node	Medium	LeetCode_Curated_SQL_70, Database, SQL_I_Day_4_Union_and_Select	794	48.38
0607	Sales Person	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_6_Union	2142	44.56
0606	Construct String from Binary Tree	Medium	String, Depth_First_Search, Tree, Binary_Tree	187	100.00
0605	Can Place Flowers	Easy	Array, Greedy, Udemy_Arrays	209	85.71
0602	Friend Requests II: Who Has the Most Friends	Medium	Database	398	97.39
0601	Human Traffic of Stadium	Hard	Database	529	51.80
0600	Non-negative Integers without Consecutive Ones	Hard	Dynamic_Programming	142	100.00
0599	Minimum Index Sum of Two Lists	Easy	Array, String, Hash_Table	293	100.00
0598	Range Addition II	Easy	Array, Math	176	66.67
0596	Classes More Than 5 Students	Easy	Database	484	50.92
0595	Big Countries	Easy	Database, SQL_I_Day_1_Select	417	56.09
0594	Longest Harmonious Subsequence	Easy	Array, Hash_Table, Sorting	331	100.00
0593	Valid Square	Medium	Math, Geometry	161	83.33
0592	Fraction Addition and Subtraction	Medium	String, Math, Simulation	164	100.00
0591	Tag Validator	Hard	String, Stack	177	100.00
0590	N-ary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Stack	237	88.10
0589	N-ary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Stack, Programming_Skills_I_Day_5_Function, Level_1_Day_6_Tree	233	84.02
0587	Erect the Fence	Hard	Array, Math, Geometry	470	100.00
0586	Customer Placing the Largest Number of Orders	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function	768	44.85
0585	Investments in 2016	Medium	Database	729	99.22
0584	Find Customer Referee	Easy	Database, SQL_I_Day_1_Select	779	43.48
0583	Delete Operation for Two Strings	Medium	String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming	197	100.00
0581	Shortest Unsorted Continuous Subarray	Medium	Array, Sorting, Greedy, Two_Pointers, Stack, Monotonic_Stack	246	100.00
0577	Employee Bonus	Easy	Database	1473	95.83
0576	Out of Boundary Paths	Medium	Dynamic_Programming	153	100.00
0575	Distribute Candies	Easy	Array, Hash_Table	538	76.92
0572	Subtree of Another Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search	214	92.39
0570	Managers with at Least 5 Direct Reports	Medium	Database	454	90.82
0567	Permutation in String	Medium	Top_100_Liked_Questions, String, Hash_Table, Two_Pointers, Sliding_Window, Algorithm_I_Day_6_Sliding_Window	169	100.00
0566	Reshape the Matrix	Easy	Array, Matrix, Simulation, Data_Structure_I_Day_4_Array, Programming_Skills_I_Day_7_Array	239	99.05
0565	Array Nesting	Medium	Array, Depth_First_Search	553	100.00
0564	Find the Closest Palindrome	Hard	String, Math	179	100.00
0563	Binary Tree Tilt	Easy	Depth_First_Search, Tree, Binary_Tree	197	100.00
0561	Array Partition	Easy	Array, Sorting, Greedy, Counting_Sort	337	90.48
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array, Big_O_Time_O(n)_Space_O(n)	692	53.27
0559	Maximum Depth of N-ary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree	196	100.00
0558	Logical OR of Two Binary Grids Represented as Quad-Trees	Medium	Tree, Divide_and_Conquer	268	100.00
0557	Reverse Words in a String III	Easy	String, Two_Pointers, Algorithm_I_Day_4_Two_Pointers	215	98.10
0556	Next Greater Element III	Medium	String, Math, Two_Pointers, Programming_Skills_II_Day_10	137	80.00
0554	Brick Wall	Medium	Array, Hash_Table	307	100.00
0553	Optimal Division	Medium	Array, Dynamic_Programming, Math	154	100.00
0552	Student Attendance Record II	Hard	Dynamic_Programming	151	100.00
0551	Student Attendance Record I	Easy	String	151	95.00
0550	Game Play Analysis IV	Medium	Database	762	97.74
0547	Number of Provinces	Medium	Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_8_Standard_Traversal, Level_2_Day_19_Union_Find	229	79.73
0546	Remove Boxes	Hard	Array, Dynamic_Programming, Memoization	283	100.00
0543	Diameter of Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	307	43.93
0542	01 Matrix	Medium	Array, Dynamic_Programming, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems	441	94.06
0541	Reverse String II	Easy	String, Two_Pointers	200	83.33
0540	Single Element in a Sorted Array	Medium	Array, Binary_Search, Binary_Search_II_Day_9	274	86.67
0539	Minimum Time Difference	Medium	Array, String, Math, Sorting	183	100.00
0538	Convert BST to Greater Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	252	77.78
0537	Complex Number Multiplication	Medium	String, Math, Simulation	171	75.00
0535	Encode and Decode TinyURL	Medium	String, Hash_Table, Design, Hash_Function	183	81.25
0532	K-diff Pairs in an Array	Medium	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Udemy_Arrays	230	84.62
0530	Minimum Absolute Difference in BST	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	209	86.96
0529	Minesweeper	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix	243	87.50
0528	Random Pick with Weight	Medium	Math, Binary_Search, Prefix_Sum, Randomized, Binary_Search_II_Day_13	393	91.38
0526	Beautiful Arrangement	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	107	100.00
0525	Contiguous Array	Medium	Array, Hash_Table, Prefix_Sum	471	100.00
0524	Longest Word in Dictionary through Deleting	Medium	Array, String, Sorting, Two_Pointers	307	100.00
0523	Continuous Subarray Sum	Medium	Array, Hash_Table, Math, Prefix_Sum	682	95.45
0522	Longest Uncommon Subsequence II	Medium	Array, String, Hash_Table, Sorting, Two_Pointers	163	100.00
0521	Longest Uncommon Subsequence I	Easy	String	146	88.89
0520	Detect Capital	Easy	String	161	84.54
0519	Random Flip Matrix	Medium	Hash_Table, Math, Randomized, Reservoir_Sampling	270	100.00
0518	Coin Change II	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_20	139	100.00
0517	Super Washing Machines	Hard	Array, Greedy	210	100.00
0516	Longest Palindromic Subsequence	Medium	String, Dynamic_Programming, Dynamic_Programming_I_Day_17	243	87.50
0515	Find Largest Value in Each Tree Row	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	238	73.33
0514	Freedom Trail	Hard	String, Dynamic_Programming, Depth_First_Search, Breadth_First_Search	182	100.00
0513	Find Bottom Left Tree Value	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree	190	88.24
0511	Game Play Analysis I	Easy	LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function	790	45.04
0509	Fibonacci Number	Easy	Dynamic_Programming, Math, Recursion, Memoization, Dynamic_Programming_I_Day_1, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming	139	82.72
0508	Most Frequent Subtree Sum	Medium	Hash_Table, Depth_First_Search, Tree, Binary_Tree	246	80.00
0507	Perfect Number	Easy	Math	172	81.82
0506	Relative Ranks	Easy	Array, Sorting, Heap_Priority_Queue	244	94.23
0504	Base 7	Easy	Math	136	100.00
0503	Next Greater Element II	Medium	Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_10	331	92.68
0502	IPO	Hard	Array, Sorting, Greedy, Heap_Priority_Queue	799	54.55
0501	Find Mode in Binary Search Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	235	86.67
0500	Keyboard Row	Easy	Array, String, Hash_Table	170	85.19
0498	Diagonal Traverse	Medium	Array, Matrix, Simulation	430	61.54
0497	Random Point in Non-overlapping Rectangles	Medium	Math, Binary_Search, Prefix_Sum, Ordered_Set, Randomized, Reservoir_Sampling	759	100.00
0496	Next Greater Element I	Easy	Array, Hash_Table, Stack, Monotonic_Stack, Programming_Skills_I_Day_5_Function	171	100.00
0495	Teemo Attacking	Easy	Array, Simulation	283	100.00
0494	Target Sum	Medium	Array, Dynamic_Programming, Backtracking, Big_O_Time_O(n*(sum+s))_Space_O(n*(sum+s))	308	89.61
0493	Reverse Pairs	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	887	66.67
0492	Construct the Rectangle	Easy	Math	202	88.89
0491	Non-decreasing Subsequences	Medium	Array, Hash_Table, Bit_Manipulation, Backtracking	499	100.00
0488	Zuma Game	Hard	String, Dynamic_Programming, Breadth_First_Search, Memoization	1727	100.00
0486	Predict the Winner	Medium	Array, Dynamic_Programming, Math, Recursion, Game_Theory	158	84.62
0485	Max Consecutive Ones	Easy	Array	272	88.46
0483	Smallest Good Base	Hard	Math, Binary_Search	164	100.00
0482	License Key Formatting	Easy	String	234	87.18
0481	Magical String	Medium	String, Two_Pointers	124	100.00
0480	Sliding Window Median	Hard	Array, Hash_Table, Heap_Priority_Queue, Sliding_Window	409	100.00
0479	Largest Palindrome Product	Hard	Math	147	100.00
0478	Generate Random Point in a Circle	Medium	Math, Geometry, Randomized, Rejection_Sampling	862	100.00
0477	Total Hamming Distance	Medium	Array, Math, Bit_Manipulation	298	100.00
0476	Number Complement	Easy	Bit_Manipulation	133	100.00
0475	Heaters	Medium	Array, Sorting, Binary_Search, Two_Pointers	356	87.50
0474	Ones and Zeroes	Medium	Array, String, Dynamic_Programming	204	100.00
0473	Matchsticks to Square	Medium	Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask	255	100.00
0472	Concatenated Words	Hard	Array, String, Dynamic_Programming, Depth_First_Search, Trie	484	100.00
0470	Implement Rand10() Using Rand7()	Medium	Math, Randomized, Probability_and_Statistics, Rejection_Sampling	220	100.00
0468	Validate IP Address	Medium	String	192	62.50
0467	Unique Substrings in Wraparound String	Medium	String, Dynamic_Programming	197	100.00
0466	Count The Repetitions	Hard	String, Dynamic_Programming	147	100.00
0464	Can I Win	Medium	Dynamic_Programming, Math, Bit_Manipulation, Bitmask, Memoization, Game_Theory	213	100.00
0463	Island Perimeter	Easy	Array, Depth_First_Search, Breadth_First_Search, Matrix	381	98.04
0462	Minimum Moves to Equal Array Elements II	Medium	Array, Math, Sorting	210	100.00
0461	Hamming Distance	Easy	Bit_Manipulation, Udemy_Bit_Manipulation	150	96.15
0460	LFU Cache	Hard	Hash_Table, Design, Linked_List, Doubly_Linked_List	1143	100.00
0459	Repeated Substring Pattern	Easy	String, String_Matching, Programming_Skills_II_Day_2	201	100.00
0458	Poor Pigs	Hard	Dynamic_Programming, Math, Combinatorics	133	80.00
0457	Circular Array Loop	Medium	Array, Hash_Table, Two_Pointers	143	100.00
0456	132 Pattern	Medium	Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack, Udemy_Arrays	434	100.00
0455	Assign Cookies	Easy	Array, Sorting, Greedy	260	96.67
0454	4Sum II	Medium	Array, Hash_Table	660	85.71
0453	Minimum Moves to Equal Array Elements	Medium	Array, Math	282	100.00
0452	Minimum Number of Arrows to Burst Balloons	Medium	Array, Sorting, Greedy	934	100.00
0451	Sort Characters By Frequency	Medium	String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort, Data_Structure_II_Day_21_Heap_Priority_Queue	288	81.72
0450	Delete Node in a BST	Medium	Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_16_Tree	257	84.62
0449	Serialize and Deserialize BST	Medium	String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Binary_Search_Tree	233	100.00
0448	Find All Numbers Disappeared in an Array	Easy	Array, Hash_Table, Udemy_Arrays	394	100.00
0447	Number of Boomerangs	Medium	Array, Hash_Table, Math	308	100.00
0446	Arithmetic Slices II - Subsequence	Hard	Array, Dynamic_Programming	312	100.00
0445	Add Two Numbers II	Medium	Math, Stack, Linked_List, Programming_Skills_II_Day_15, Udemy_Linked_List	240	82.61
0443	String Compression	Medium	String, Two_Pointers	198	92.68
0442	Find All Duplicates in an Array	Medium	Array, Hash_Table, Udemy_Arrays	480	73.81
0441	Arranging Coins	Easy	Math, Binary_Search, Binary_Search_I_Day_6	150	84.21
0440	K-th Smallest in Lexicographical Order	Hard	Trie	149	100.00
0438	Find All Anagrams in a String	Medium	Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer, Big_O_Time_O(n+m)_Space_O(1)	561	54.68
0437	Path Sum III	Medium	Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n)	403	54.12
0436	Find Right Interval	Medium	Array, Sorting, Binary_Search, Binary_Search_II_Day_11	333	100.00
0435	Non-overlapping Intervals	Medium	Array, Dynamic_Programming, Sorting, Greedy, Data_Structure_II_Day_4_Array	1040	85.07
0434	Number of Segments in a String	Easy	String	167	80.00
0433	Minimum Genetic Mutation	Medium	String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	204	82.08
0432	All O`one Data Structure	Hard	Hash_Table, Design, Linked_List, Doubly_Linked_List	1200	100.00
0430	Flatten a Multilevel Doubly Linked List	Medium	Depth_First_Search, Linked_List, Doubly_Linked_List	194	97.44
0429	N-ary Tree Level Order Traversal	Medium	Breadth_First_Search, Tree, Programming_Skills_II_Day_9	248	75.86
0427	Construct Quad Tree	Medium	Array, Tree, Matrix, Divide_and_Conquer	221	94.74
0424	Longest Repeating Character Replacement	Medium	String, Hash_Table, Sliding_Window, Level_1_Day_12_Sliding_Window/Two_Pointer	288	84.38
0423	Reconstruct Original Digits from English	Medium	String, Hash_Table, Math	349	100.00
0421	Maximum XOR of Two Numbers in an Array	Medium	Array, Hash_Table, Bit_Manipulation, Trie	710	100.00
0420	Strong Password Checker	Hard	String, Greedy, Heap_Priority_Queue	157	80.00
0419	Battleships in a Board	Medium	Array, Depth_First_Search, Matrix	273	76.92
0417	Pacific Atlantic Water Flow	Medium	Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems, Level_2_Day_10_Graph/BFS/DFS, Udemy_Graph	319	100.00
0416	Partition Equal Subset Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums)	204	98.82
0415	Add Strings	Easy	String, Math, Simulation, Data_Structure_II_Day_6_String	296	76.00
0414	Third Maximum Number	Easy	Array, Sorting	317	73.00
0413	Arithmetic Slices	Medium	Array, Dynamic_Programming, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_10	156	100.00
0412	Fizz Buzz	Easy	String, Math, Simulation, Udemy_Integers	307	71.81
0410	Split Array Largest Sum	Hard	Array, Dynamic_Programming, Greedy, Binary_Search	165	100.00
0409	Longest Palindrome	Easy	String, Hash_Table, Greedy, Data_Structure_II_Day_6_String, Level_1_Day_5_Greedy	259	60.71
0407	Trapping Rain Water II	Hard	Array, Breadth_First_Search, Matrix, Heap_Priority_Queue	500	100.00
0406	Queue Reconstruction by Height	Medium	Array, Sorting, Greedy, Segment_Tree, Binary_Indexed_Tree	306	100.00
0405	Convert a Number to Hexadecimal	Easy	Math, Bit_Manipulation	132	100.00
0404	Sum of Left Leaves	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree	173	86.05
0403	Frog Jump	Hard	Array, Dynamic_Programming	240	100.00
0402	Remove K Digits	Medium	String, Greedy, Stack, Monotonic_Stack	375	75.00
0401	Binary Watch	Easy	Bit_Manipulation, Backtracking	266	71.43
0400	Nth Digit	Medium	Math, Binary_Search	271	50.00
0399	Evaluate Division	Medium	Array, Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Shortest_Path	183	91.49
0398	Random Pick Index	Medium	Hash_Table, Math, Randomized, Reservoir_Sampling	1091	75.00
0397	Integer Replacement	Medium	Dynamic_Programming, Greedy, Bit_Manipulation, Memoization	145	87.50
0396	Rotate Function	Medium	Array, Dynamic_Programming, Math	571	87.50
0395	Longest Substring with At Least K Repeating Characters	Medium	String, Hash_Table, Sliding_Window, Divide_and_Conquer	274	66.67
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)	224	64.86
0393	UTF-8 Validation	Medium	Array, Bit_Manipulation	219	100.00
0392	Is Subsequence	Easy	String, Dynamic_Programming, Two_Pointers, Dynamic_Programming_I_Day_19, Level_1_Day_2_String, Udemy_Two_Pointers	156	87.74
0391	Perfect Rectangle	Hard	Array, Line_Sweep	897	100.00
0390	Elimination Game	Medium	Math, Recursion	319	55.56
0389	Find the Difference	Easy	String, Hash_Table, Sorting, Bit_Manipulation, Programming_Skills_I_Day_8_String, Udemy_Bit_Manipulation	256	64.81
0388	Longest Absolute File Path	Medium	String, Depth_First_Search, Stack	150	100.00
0387	First Unique Character in a String	Easy	String, Hash_Table, Counting, Queue, Data_Structure_I_Day_6_String	369	82.68
0386	Lexicographical Numbers	Medium	Depth_First_Search, Trie	463	83.33
0385	Mini Parser	Medium	String, Depth_First_Search, Stack	210	100.00
0384	Shuffle an Array	Medium	Array, Math, Randomized, Algorithm_II_Day_20_Others	940	72.09
0383	Ransom Note	Easy	String, Hash_Table, Counting, Data_Structure_I_Day_6_String	333	79.58
0382	Linked List Random Node	Medium	Math, Linked_List, Randomized, Reservoir_Sampling	283	100.00
0381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Array, Hash_Table, Math, Design, Randomized	1313	50.00
0380	Insert Delete GetRandom O(1)	Medium	Array, Hash_Table, Math, Design, Randomized, Programming_Skills_II_Day_20	1326	68.23
0378	Kth Smallest Element in a Sorted Matrix	Medium	Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue	522	59.78
0377	Combination Sum IV	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_21	217	72.41
0376	Wiggle Subsequence	Medium	Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_18	162	88.89
0375	Guess Number Higher or Lower II	Medium	Dynamic_Programming, Math, Game_Theory	235	75.00
0374	Guess Number Higher or Lower	Easy	Binary_Search, Interactive, Binary_Search_I_Day_1	134	94.19
0373	Find K Pairs with Smallest Sums	Medium	Array, Heap_Priority_Queue	1809	80.95
0372	Super Pow	Medium	Math, Divide_and_Conquer	196	100.00
0371	Sum of Two Integers	Medium	Math, Bit_Manipulation, Udemy_Bit_Manipulation	129	95.45
0368	Largest Divisible Subset	Medium	Array, Dynamic_Programming, Math, Sorting	412	73.33
0367	Valid Perfect Square	Easy	Math, Binary_Search, Binary_Search_I_Day_3	137	94.55
0365	Water and Jug Problem	Medium	Math, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search	130	100.00
0363	Max Sum of Rectangle No Larger Than K	Hard	Array, Dynamic_Programming, Binary_Search, Matrix, Ordered_Set	243	100.00
0357	Count Numbers with Unique Digits	Medium	Dynamic_Programming, Math, Backtracking	104	100.00
0355	Design Twitter	Medium	Hash_Table, Design, Heap_Priority_Queue, Linked_List	288	68.75
0354	Russian Doll Envelopes	Hard	Array, Dynamic_Programming, Sorting, Binary_Search	788	100.00
0352	Data Stream as Disjoint Intervals	Hard	Binary_Search, Design, Ordered_Set	905	75.00
0350	Intersection of Two Arrays II	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Data_Structure_I_Day_3_Array, Binary_Search_I_Day_10	321	73.37
0349	Intersection of Two Arrays	Easy	Array, Hash_Table, Sorting, Binary_Search, Two_Pointers	346	66.99
0347	Top K Frequent Elements	Medium	Top_100_Liked_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(k)	268	99.74
0345	Reverse Vowels of a String	Easy	String, Two_Pointers	349	80.63
0344	Reverse String	Easy	String, Two_Pointers, Recursion, Algorithm_I_Day_4_Two_Pointers, Udemy_Strings	445	69.75
0343	Integer Break	Medium	Dynamic_Programming, Math, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_21	218	63.89
0342	Power of Four	Easy	Math, Bit_Manipulation, Recursion	150	92.11
0341	Flatten Nested List Iterator	Medium	Depth_First_Search, Tree, Stack, Design, Queue, Iterator, Programming_Skills_II_Day_18	210	100.00
0338	Counting Bits	Easy	Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation, Big_O_Time_O(num)_Space_O(num)	186	99.26
0337	House Robber III	Medium	Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	282	84.62
0336	Palindrome Pairs	Hard	Array, String, Hash_Table, Trie	2451	67.33
0335	Self Crossing	Hard	Array, Math, Geometry	477	100.00
0334	Increasing Triplet Subsequence	Medium	Array, Greedy, Data_Structure_II_Day_5_Array	672	60.61
0332	Reconstruct Itinerary	Hard	Depth_First_Search, Graph, Eulerian_Circuit	240	93.88
0331	Verify Preorder Serialization of a Binary Tree	Medium	String, Tree, Binary_Tree, Stack	335	70.00
0330	Patching Array	Hard	Array, Greedy	201	100.00
0329	Longest Increasing Path in a Matrix	Hard	Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph, Memoization, Topological_Sort	322	92.65
0328	Odd Even Linked List	Medium	Linked_List, Level_2_Day_4_Linked_List, Udemy_Linked_List	216	86.96
0327	Count of Range Sum	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	638	100.00
0326	Power of Three	Easy	Math, Recursion	413	76.12
0324	Wiggle Sort II	Medium	Array, Sorting, Divide_and_Conquer, Quickselect	545	57.14
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(amount)	332	50.68
0321	Create Maximum Number	Hard	Greedy, Stack, Monotonic_Stack	209	100.00
0319	Bulb Switcher	Medium	Math, Brainteaser	214	77.78
0318	Maximum Product of Word Lengths	Medium	Array, String, Bit_Manipulation	477	100.00
0316	Remove Duplicate Letters	Medium	String, Greedy, Stack, Monotonic_Stack	291	81.82
0315	Count of Smaller Numbers After Self	Hard	Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort	1282	88.46
0313	Super Ugly Number	Medium	Array, Dynamic_Programming, Math	330	100.00
0312	Burst Balloons	Hard	Array, Dynamic_Programming	210	100.00
0310	Minimum Height Trees	Medium	Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort	521	97.56
0309	Best Time to Buy and Sell Stock with Cooldown	Medium	Array, Dynamic_Programming, Dynamic_Programming_I_Day_8	272	73.33
0307	Range Sum Query - Mutable	Medium	Array, Design, Segment_Tree, Binary_Indexed_Tree	1729	78.79
0306	Additive Number	Medium	String, Backtracking	261	63.16
0304	Range Sum Query 2D - Immutable	Medium	Array, Matrix, Design, Prefix_Sum, Dynamic_Programming_I_Day_14, Programming_Skills_II_Day_13, Udemy_2D_Arrays/Matrix	1373	85.71
0303	Range Sum Query - Immutable	Easy	Array, Design, Prefix_Sum, Programming_Skills_I_Day_12_Class_and_Object	472	63.64
0301	Remove Invalid Parentheses	Hard	String, Breadth_First_Search, Backtracking	312	100.00
0300	Longest Increasing Subsequence	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming, Big_O_Time_O(n*log_n)_Space_O(n)	318	82.28
0299	Bulls and Cows	Medium	String, Hash_Table, Counting, Level_1_Day_13_Hashmap	254	84.82
0297	Serialize and Deserialize Binary Tree	Hard	String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue	475	78.85
0295	Find Median from Data Stream	Hard	Top_100_Liked_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream, Big_O_Time_O(n*log_n)_Space_O(n)	2289	33.60
0292	Nim Game	Easy	Math, Game_Theory, Brainteaser	129	94.29
0290	Word Pattern	Easy	String, Hash_Table, Data_Structure_II_Day_7_String	177	89.55
0289	Game of Life	Medium	Array, Matrix, Simulation	174	96.97
0287	Find the Duplicate Number	Medium	Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5, Big_O_Time_O(n)_Space_O(n)	656	66.21
0284	Peeking Iterator	Medium	Array, Design, Iterator	286	62.50
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	516	79.07
0282	Expression Add Operators	Hard	String, Math, Backtracking	367	85.71
0279	Perfect Squares	Medium	Dynamic_Programming, Math, Breadth_First_Search, Dynamic_Programming_I_Day_21	176	98.80
0278	First Bad Version	Easy	Binary_Search, Interactive, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_5, Level_1_Day_7_Binary_Search	349	76.86
0275	H-Index II	Medium	Array, Binary_Search, Binary_Search_II_Day_8	398	81.82
0274	H-Index	Medium	Array, Sorting, Counting_Sort	291	45.45
0273	Integer to English Words	Hard	String, Math, Recursion, Udemy_Strings	273	82.93
0268	Missing Number	Easy	Array, Hash_Table, Math, Sorting, Binary_Search, Bit_Manipulation	380	83.49
0264	Ugly Number II	Medium	Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue, Dynamic_Programming_I_Day_11	182	95.45
0263	Ugly Number	Easy	Math	243	64.10
0262	Trips and Users	Hard	Database	577	63.97
0260	Single Number III	Medium	Array, Bit_Manipulation	222	100.00
0258	Add Digits	Easy	Math, Simulation, Number_Theory	234	71.64
0257	Binary Tree Paths	Easy	String, Depth_First_Search, Tree, Binary_Tree, Backtracking	320	72.84
0242	Valid Anagram	Easy	String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Strings	251	87.65
0241	Different Ways to Add Parentheses	Medium	String, Dynamic_Programming, Math, Recursion, Memoization	294	73.47
0240	Search a 2D Matrix II	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8, Big_O_Time_O(n+m)_Space_O(1)	460	66.08
0239	Sliding Window Maximum	Hard	Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays, Big_O_Time_O(n*k)_Space_O(n+k)	1059	86.14
0238	Product of Array Except Self	Medium	Top_100_Liked_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays, Big_O_Time_O(n^2)_Space_O(n)	669	48.96
0237	Delete Node in a Linked List	Medium	Linked_List	183	93.00
0236	Lowest Common Ancestor of a Binary Tree	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	386	45.21
0235	Lowest Common Ancestor of a Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree	404	75.59
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1)	641	79.53
0233	Number of Digit One	Hard	Dynamic_Programming, Math, Recursion	129	100.00
0232	Implement Queue using Stacks	Easy	Stack, Design, Queue, Data_Structure_I_Day_9_Stack_Queue, Programming_Skills_I_Day_11_Containers_and_Libraries, Level_2_Day_16_Design	258	70.86
0231	Power of Two	Easy	Math, Bit_Manipulation, Recursion, Algorithm_I_Day_13_Bit_Manipulation	161	86.81
0230	Kth Smallest Element in a BST	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n)	393	33.33
0229	Majority Element II	Medium	Array, Hash_Table, Sorting, Counting	408	71.21
0228	Summary Ranges	Easy	Array	169	91.89
0227	Basic Calculator II	Medium	String, Math, Stack, Level_2_Day_18_Stack	383	62.50
0226	Invert Binary Tree	Easy	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	233	54.90
0225	Implement Stack using Queues	Easy	Stack, Design, Queue	147	88.57
0224	Basic Calculator	Hard	String, Math, Stack, Recursion	294	93.33
0223	Rectangle Area	Medium	Math, Geometry	291	66.67
0222	Count Complete Tree Nodes
0221	Maximal Square	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Big_O_Time_O(m*n)_Space_O(m*n)	614	44.00
0220	Contains Duplicate III	Hard	Array, Sorting, Sliding_Window, Ordered_Set, Bucket_Sort	921	72.22
0219	Contains Duplicate II	Easy	Array, Hash_Table, Sliding_Window	813	80.46
0218	The Skyline Problem	Hard	Array, Heap_Priority_Queue, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Line_Sweep	365	93.14
0217	Contains Duplicate	Easy	Top_Interview_Questions, Array, Hash_Table, Sorting, Data_Structure_I_Day_1_Array, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Arrays	719	73.49
0216	Combination Sum III	Medium	Array, Backtracking, Udemy_Backtracking/Recursion	175	90.91
0215	Kth Largest Element in an Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(log(n))	839	34.43
0214	Shortest Palindrome	Hard	String, Hash_Function, String_Matching, Rolling_Hash	278	100.00
0213	House Robber II	Medium	Array, Dynamic_Programming, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Udemy_Dynamic_Programming	257	59.62
0212	Word Search II	Hard	Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie	268	100.00
0211	Design Add and Search Words Data Structure	Medium	String, Depth_First_Search, Design, Trie	2256	87.04
0210	Course Schedule II	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Level_2_Day_11_Graph/BFS/DFS	266	96.32
0209	Minimum Size Subarray Sum	Medium	Array, Binary_Search, Prefix_Sum, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Binary_Search_II_Day_1	315	96.73
0208	Implement Trie (Prefix Tree)	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N)	689	61.00
0207	Course Schedule	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Big_O_Time_O(N)_Space_O(N)	183	92.07
0206	Reverse Linked List	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1)	279	45.78
0205	Isomorphic Strings	Easy	String, Hash_Table, Level_1_Day_2_String	278	79.96
0204	Count Primes	Medium	Top_Interview_Questions, Array, Math, Enumeration, Number_Theory	360	96.61
0203	Remove Linked List Elements	Easy	Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List	233	91.22
0202	Happy Number	Easy	Top_Interview_Questions, Hash_Table, Math, Two_Pointers, Algorithm_II_Day_21_Others, Programming_Skills_I_Day_4_Loop, Level_2_Day_1_Implementation/Simulation	261	45.08
0201	Bitwise AND of Numbers Range	Medium	Bit_Manipulation, Algorithm_II_Day_19_Bit_Manipulation	368	80.00
0200	Number of Islands	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS, Udemy_Graph, Big_O_Time_O(M*N)_Space_O(M*N)	252	95.41
0199	Binary Tree Right Side View	Medium	Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree, Level_2_Day_15_Tree	194	92.89
0198	House Robber	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Level_2_Day_12_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	156	92.24
0197	Rising Temperature	Easy	Database, SQL_I_Day_6_Union	394	94.15
0196	Delete Duplicate Emails	Easy	Database, SQL_I_Day_2_Select_and_Order	593	94.17
0195	Tenth Line	Easy	Shell	36	87.50
0194	Transpose File	Medium	Shell	461	33.47
0193	Valid Phone Numbers	Easy	Shell	98	88.64
0192	Word Frequency	Medium	Shell	96	80.40
0191	Number of 1 Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Algorithm_I_Day_13_Bit_Manipulation, Programming_Skills_I_Day_2_Operator, Udemy_Bit_Manipulation	237	68.44
0190	Reverse Bits	Easy	Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Bit_Manipulation	198	81.82
0189	Rotate Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	483	86.95
0188	Best Time to Buy and Sell Stock IV	Hard	Array, Dynamic_Programming	293	68.31
0187	Repeated DNA Sequences	Medium	String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash, Data_Structure_II_Day_9_String, Udemy_Strings	319	79.03
0185	Department Top Three Salaries	Hard	Database	757	87.06
0184	Department Highest Salary	Medium	Database	637	76.01
0183	Customers Who Never Order	Easy	Database, SQL_I_Day_1_Select	712	33.67
0182	Duplicate Emails	Easy	Database, SQL_I_Day_10_Where	396	68.40
0181	Employees Earning More Than Their Managers	Easy	Database	351	94.75
0180	Consecutive Numbers	Medium	Database	695	38.05
0179	Largest Number	Medium	Top_Interview_Questions, String, Sorting, Greedy	187	100.00
0178	Rank Scores	Medium	Database	292	85.14
0177	Nth Highest Salary	Medium	Database	338	86.68
0176	Second Highest Salary	Medium	Database, SQL_I_Day_4_Union_and_Select	219	92.54
0175	Combine Two Tables	Easy	Database, SQL_I_Day_5_Union	473	54.97
0174	Dungeon Game	Hard	Array, Dynamic_Programming, Matrix	300	66.67
0173	Binary Search Tree Iterator	Medium	Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator, Data_Structure_II_Day_17_Tree, Programming_Skills_II_Day_16, Level_2_Day_9_Binary_Search_Tree	563	46.91
0172	Factorial Trailing Zeroes	Medium	Top_Interview_Questions, Math, Udemy_Integers	220	67.65
0171	Excel Sheet Column Number	Easy	Top_Interview_Questions, String, Math	310	30.68
0169	Majority Element	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1)	460	51.25
0168	Excel Sheet Column Title	Easy	String, Math	208	66.07
0167	Two Sum II - Input Array Is Sorted	Medium	Array, Binary_Search, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Binary_Search_I_Day_7	403	68.74
0166	Fraction to Recurring Decimal	Medium	Top_Interview_Questions, String, Hash_Table, Math	147	90.91
0165	Compare Version Numbers	Medium	String, Two_Pointers	144	100.00
0164	Maximum Gap	Medium	Array, Sorting, Bucket_Sort, Radix_Sort	991	68.00
0162	Find Peak Element	Medium	Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_II_Day_12	297	53.85
0160	Intersection of Two Linked Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List, Big_O_Time_O(M+N)_Space_O(1)	262	83.50
0155	Min Stack	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18, Level_2_Day_16_Design, Udemy_Design, Big_O_Time_O(1)_Space_O(N)	331	84.88
0154	Find Minimum in Rotated Sorted Array II	Hard	Array, Binary_Search, Binary_Search_II_Day_13	275	84.00
0153	Find Minimum in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12, Udemy_Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N)	262	60.96
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6, Level_2_Day_13_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	253	88.42
0151	Reverse Words in a String	Medium	String, Two_Pointers, Udemy_Strings	206	98.90
0150	Evaluate Reverse Polish Notation	Medium	Top_Interview_Questions, Array, Math, Stack, Programming_Skills_II_Day_3	233	88.82
0149	Max Points on a Line	Hard	Top_Interview_Questions, Array, Hash_Table, Math, Geometry, Algorithm_II_Day_21_Others	307	83.33
0148	Sort List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Level_2_Day_4_Linked_List, Big_O_Time_O(log(N))_Space_O(log(N))	820	61.70
0147	Insertion Sort List	Medium	Sorting, Linked_List	385	52.00
0146	LRU Cache	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Udemy_Linked_List, Big_O_Time_O(1)_Space_O(capacity)	1116	97.93
0145	Binary Tree Postorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	211	80.00
0144	Binary Tree Preorder Traversal	Easy	Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue	277	37.90
0143	Reorder List	Medium	Two_Pointers, Stack, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Programming_Skills_II_Day_14	395	82.26
0142	Linked List Cycle II	Medium	Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1)	192	63.39
0141	Linked List Cycle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1)	223	91.85
0140	Word Break II	Hard	Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Backtracking, Trie, Memoization	287	44.19
0139	Word Break	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_9, Udemy_Dynamic_Programming, Big_O_Time_O(M+max*N)_Space_O(M+N+max)	197	87.17
0138	Copy List with Random Pointer	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(N)	274	80.58
0137	Single Number II	Medium	Array, Bit_Manipulation	344	64.29
0136	Single Number	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Integers, Big_O_Time_O(N)_Space_O(1)	344	83.63
0135	Candy	Hard	Array, Greedy	466	58.33
0134	Gas Station	Medium	Top_Interview_Questions, Array, Greedy	545	70.18
0133	Clone Graph	Medium	Hash_Table, Depth_First_Search, Breadth_First_Search, Graph, Udemy_Graph	351	60.91
0132	Palindrome Partitioning II	Hard	String, Dynamic_Programming	290	100.00
0131	Palindrome Partitioning	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(N*2^N)_Space_O(2^N*N)	820	87.27
0130	Surrounded Regions	Medium	Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search	355	84.42
0129	Sum Root to Leaf Numbers	Medium	Depth_First_Search, Tree, Binary_Tree	237	52.50
0128	Longest Consecutive Sequence	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find, Big_O_Time_O(N_log_N)_Space_O(1)	460	97.77
0127	Word Ladder	Hard	Top_Interview_Questions, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search	396	98.68
0126	Word Ladder II	Hard	String, Hash_Table, Breadth_First_Search, Backtracking	418	51.45
0125	Valid Palindrome	Easy	Top_Interview_Questions, String, Two_Pointers, Udemy_Two_Pointers	353	52.06
0124	Binary Tree Maximum Path Sum	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(N)	331	74.42
0123	Best Time to Buy and Sell Stock III	Hard	Array, Dynamic_Programming	585	95.24
0122	Best Time to Buy and Sell Stock II	Medium	Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_7, Udemy_Arrays	197	95.10
0121	Best Time to Buy and Sell Stock	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7, Level_1_Day_5_Greedy, Udemy_Arrays, Big_O_Time_O(N)_Space_O(1)	609	94.06
0120	Triangle	Medium	Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_13, Udemy_Dynamic_Programming	194	97.87
0119	Pascal’s Triangle II	Easy	Array, Dynamic_Programming, Data_Structure_II_Day_3_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming	157	97.27
0118	Pascal’s Triangle	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_4_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming	277	33.22
0117	Populating Next Right Pointers in Each Node II	Medium	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search	199	94.67
0116	Populating Next Right Pointers in Each Node	Medium	Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search	355	69.02
0115	Distinct Subsequences	Hard	String, Dynamic_Programming	285	88.89
0114	Flatten Binary Tree to Linked List	Medium	Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(N)	191	93.10
0113	Path Sum II	Medium	Depth_First_Search, Tree, Binary_Tree, Backtracking, Data_Structure_II_Day_16_Tree	364	78.67
0112	Path Sum	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree	322	36.41
0111	Minimum Depth of Binary Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue	525	90.51
0110	Balanced Binary Tree	Easy	Depth_First_Search, Tree, Binary_Tree, Programming_Skills_II_Day_2, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue	182	71.30
0109	Convert Sorted List to Binary Search Tree	Medium	Tree, Binary_Tree, Linked_List, Binary_Search_Tree, Divide_and_Conquer	191	100.00
0108	Convert Sorted Array to Binary Search Tree	Easy	Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Level_2_Day_9_Binary_Search_Tree, Udemy_Tree_Stack_Queue	167	80.29
0107	Binary Tree Level Order Traversal II	Medium	Breadth_First_Search, Tree, Binary_Tree	187	87.50
0106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer	167	100.00
0105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Big_O_Time_O(N)_Space_O(N)	183	95.45
0104	Maximum Depth of Binary Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(H)	166	83.53
0103	Binary Tree Zigzag Level Order Traversal	Medium	Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_15_Tree, Udemy_Tree_Stack_Queue	176	71.62
0102	Binary Tree Level Order Traversal	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_1_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(N)	198	95.14
0101	Symmetric Tree	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_2_Day_15_Tree, Big_O_Time_O(N)_Space_O(log(N))	153	82.35
0100	Same Tree	Easy	Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Level_2_Day_15_Tree, Udemy_Tree_Stack_Queue	134	86.63
0099	Recover Binary Search Tree	Medium	Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree	221	90.00
0098	Validate Binary Search Tree	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(log(N))	190	61.62
0097	Interleaving String	Medium	String, Dynamic_Programming	149	81.58
0096	Unique Binary Search Trees	Medium	Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_11, Big_O_Time_O(n)_Space_O(1)	116	92.31
0095	Unique Binary Search Trees II	Medium	Dynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree	167	100.00
0094	Binary Tree Inorder Traversal	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n)	152	66.67
0093	Restore IP Addresses	Medium	String, Backtracking	152	100.00
0092	Reverse Linked List II	Medium	Linked_List	144	75.00
0091	Decode Ways	Medium	Top_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_10	148	79.07
0090	Subsets II	Medium	Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking	200	88.33
0089	Gray Code	Medium	Math, Bit_Manipulation, Backtracking	271	69.23
0088	Merge Sorted Array	Easy	Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array	170	69.74
0087	Scramble String	Hard	String, Dynamic_Programming	174	87.50
0086	Partition List	Medium	Two_Pointers, Linked_List	160	70.73
0085	Maximal Rectangle	Hard	Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack	209	100.00
0084	Largest Rectangle in Histogram	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n_log_n)_Space_O(log_n)	476	90.79
0083	Remove Duplicates from Sorted List	Easy	Linked_List, Data_Structure_I_Day_8_Linked_List	173	82.42
0082	Remove Duplicates from Sorted List II	Medium	Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers	166	89.47
0081	Search in Rotated Sorted Array II	Medium	Array, Binary_Search, Binary_Search_II_Day_12	170	96.30
0080	Remove Duplicates from Sorted Array II	Medium	Array, Two_Pointers, Udemy_Arrays	192	80.67
0079	Word Search	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n)	392	72.92
0078	Subsets	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n*2^n)	171	94.92
0077	Combinations	Medium	Backtracking, Algorithm_I_Day_11_Recursion_Backtracking	232	100.00
0076	Minimum Window Substring	Hard	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Big_O_Time_O(s.length())_Space_O(1)	191	96.38
0075	Sort Colors	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	164	64.43
0074	Search a 2D Matrix	Medium	Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1)	159	74.46
0073	Set Matrix Zeroes	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix, Big_O_Time_O(m*n)_Space_O(1)	248	97.33
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	182	92.16
0071	Simplify Path	Medium	String, Stack	185	92.86
0070	Climbing Stairs	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	124	71.98
0069	Sqrt(x)	Easy	Top_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_4	140	94.72
0068	Text Justification	Hard	Array, String, Simulation	153	92.96
0067	Add Binary	Easy	String, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_5	164	90.60
0066	Plus One	Easy	Top_Interview_Questions, Array, Math, Programming_Skills_II_Day_3, Udemy_Arrays	148	98.75
0065	Valid Number	Hard	String	151	100.00
0064	Minimum Path Sum	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)	164	100.00
0063	Unique Paths II	Medium	Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_15	151	81.94
0062	Unique Paths	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)	118	94.65
0061	Rotate List	Medium	Two_Pointers, Linked_List, Programming_Skills_II_Day_16, Udemy_Linked_List	160	92.22
0060	Permutation Sequence	Hard	Math, Recursion	132	100.00
0059	Spiral Matrix II	Medium	Array, Matrix, Simulation, Data_Structure_II_Day_3_Array	153	41.70
0058	Length of Last Word	Easy	String, Programming_Skills_II_Day_6, Udemy_Arrays	135	93.67
0057	Insert Interval	Medium	Array, Level_2_Day_17_Interval	249	75.63
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n_log_n)_Space_O(n)	334	80.67
0055	Jump Game	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1)	332	89.35
0054	Spiral Matrix	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8, Level_2_Day_1_Implementation/Simulation, Udemy_2D_Arrays/Matrix	132	95.12
0053	Maximum Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1)	510	78.81
0052	N-Queens II	Hard	Backtracking	128	97.56
0051	N-Queens	Hard	Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(N!)_Space_O(N)	192	90.74
0050	Pow(x, n)	Medium	Top_Interview_Questions, Math, Recursion, Udemy_Integers	172	38.68
0049	Group Anagrams	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings, Big_O_Time_O(n*k_log_k)_Space_O(n)	308	96.34
0048	Rotate Image	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n^2)_Space_O(1)	160	90.11
0047	Permutations II	Medium	Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking	199	100.00
0046	Permutations	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(n*n!)_Space_O(n+n!)	188	99.00
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4, Big_O_Time_O(n)_Space_O(1)	208	93.37
0044	Wildcard Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion, Udemy_Dynamic_Programming	220	84.85
0043	Multiply Strings	Medium	String, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4, Level_2_Day_2_String	165	96.72
0042	Trapping Rain Water	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers, Big_O_Time_O(n)_Space_O(1)	189	99.37
0041	First Missing Positive	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n)	357	97.17
0040	Combination Sum II	Medium	Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking	217	93.75
0039	Combination Sum	Medium	Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n+2^n)	226	88.89
0038	Count and Say	Medium	Top_Interview_Questions, String	135	100.00
0037	Sudoku Solver	Hard	Array, Matrix, Backtracking	148	100.00
0036	Valid Sudoku	Medium	Top_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array	181	95.15
0035	Search Insert Position	Easy	Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2, Big_O_Time_O(log_n)_Space_O(1)	159	93.03
0034	Find First and Last Position of Element in Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5, Big_O_Time_O(log_n)_Space_O(1)	174	100.00
0033	Search in Rotated Sorted Array	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11, Level_2_Day_8_Binary_Search, Udemy_Binary_Search, Big_O_Time_O(log_n)_Space_O(1)	151	93.77
0032	Longest Valid Parentheses	Hard	Top_100_Liked_Questions, String, Dynamic_Programming, Stack, Big_O_Time_O(n)_Space_O(1)	161	82.14
0031	Next Permutation	Medium	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	205	48.21
0030	Substring with Concatenation of All Words	Hard	String, Hash_Table, Sliding_Window	182	100.00
0029	Divide Two Integers	Medium	Top_Interview_Questions, Math, Bit_Manipulation, Udemy_Bit_Manipulation	144	82.50
0028	Find the Index of the First Occurrence in a String	Easy	Top_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_1	126	97.58
0027	Remove Element	Easy	Array, Two_Pointers	162	76.44
0026	Remove Duplicates from Sorted Array	Easy	Top_Interview_Questions, Array, Two_Pointers, Udemy_Two_Pointers	249	67.38
0025	Reverse Nodes in k-Group	Hard	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(k)	189	67.03
0024	Swap Nodes in Pairs	Medium	Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1)	149	44.20
0023	Merge k Sorted Lists	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(k*n*log(k))_Space_O(log(k))	198	93.77
0022	Generate Parentheses	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n)	161	85.45
0021	Merge Two Sorted Lists	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(m+n)_Space_O(m+n)	157	92.24
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)	137	88.76
0019	Remove Nth Node From End of List	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List, Big_O_Time_O(L)_Space_O(L)	144	96.28
0018	4Sum	Medium	Array, Sorting, Two_Pointers	229	98.59
0017	Letter Combinations of a Phone Number	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(4^n)_Space_O(n)	155	95.24
0016	3Sum Closest	Medium	Array, Sorting, Two_Pointers, Level_2_Day_14_Sliding_Window/Two_Pointer	163	100.00
0015	3Sum	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers, Udemy_Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2)	493	93.45
0014	Longest Common Prefix	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Level_2_Day_2_String, Udemy_Strings	154	89.70
0013	Roman to Integer	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Math	211	83.47
0012	Integer to Roman	Medium	String, Hash_Table, Math	180	98.25
0011	Container With Most Water	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers, Big_O_Time_O(n)_Space_O(1)	402	78.57
0010	Regular Expression Matching	Hard	Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n)	171	85.26
0009	Palindrome Number	Easy	Math, Udemy_Integers	217	95.34
0008	String to Integer (atoi)	Medium	Top_Interview_Questions, String	172	82.90
0007	Reverse Integer	Medium	Top_Interview_Questions, Math, Udemy_Integers	149	77.89
0006	Zigzag Conversion	Medium	String	200	97.79
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17, Udemy_Strings, Big_O_Time_O(n)_Space_O(n)	162	99.00
0004	Median of Two Sorted Arrays	Hard	Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer, Big_O_Time_O(log(min(N,M)))_Space_O(1), AI_can_be_used_to_solve_the_task	293	75.96
0003	Longest Substring Without Repeating Characters	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Udemy_Strings, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task	201	87.28
0002	Add Two Numbers	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15, Big_O_Time_O(max(N,M))_Space_O(max(N,M)), AI_can_be_used_to_solve_the_task	203	96.13
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task	202	91.18

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