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.

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”]

My first solution：

```python class Solution(object): def reverseString(self, s): “”” :type s: List[str] :rtype: 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

Time Complexity: O(n) Space Complexity: O(1)