LeetCode in Kotlin
344. Reverse String
Easy
Write a function that reverses a string. The input string is given as an array of characters s.
You must do this by modifying the input array in-place with O(1) extra memory.
Example 1:
Input: s = [“h”,”e”,”l”,”l”,”o”]
Output: [“o”,”l”,”l”,”e”,”h”]
Example 2:
Input: s = [“H”,”a”,”n”,”n”,”a”,”h”]
Output: [“h”,”a”,”n”,”n”,”a”,”H”]
Constraints:
1 <= s.length <= 105s[i]is a printable ascii character.
Solution
class Solution {
fun reverseString(s: CharArray) {
var left = 0
var right = s.size - 1
while (left < right) {
val tmp = s[left]
s[left++] = s[right]
s[right--] = tmp
}
}
}