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.”

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)) 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
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
0695 Max Area of Island Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 324 24.06
1254 Number of Closed Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 177 89.47
1020 Number of Enclaves Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 369 76.26
1905 Count Sub Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 866 100.00
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
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
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
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
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 1355 23.96
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
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) 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
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) 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) 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
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) 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) 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)) 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

Algorithm I
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) 201 87.28
0567 Permutation in String Medium Top_100_Liked_Questions, String, Hash_Table, Two_Pointers, Sliding_Window 169 100.00
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 324 24.06
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
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
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
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 165 27.87

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 145 25.93
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

Algorithms

# Title Difficulty Tag Time, ms Time, %
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 128 94.59
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 2255 25.00
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 134 28.57
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 980 25.00
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 1355 23.96
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 165 27.87
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 271 23.08
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 145 25.93
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 338 25.00
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 369 76.26
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 324 24.06
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 248 73.44
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) 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) 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)) 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) 202 91.18
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