From LeetCode 344. Reverse String


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.


class Solution:
    def reverseString(self, s: List[str]) -> None:
        Do not return anything, modify s in-place instead.
        left, right = 0, len(s) - 1
        while left < right:
            s[left], s[right] = s[right], s[left]
            left += 1
            right -= 1