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### LeetCode Solution - Problem 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"]
``````
Constraints:
• 1 <= s.length <= 105
• s[i] is a printable ASCII character.
Solution:

Java:

``````class Solution {
public void reverseString(char[] s) {
int left = 0;
int right = s.length - 1;

while (left < right) {
char tmp = s[left];
s[left] = s[right];
s[right] = tmp;
left++;
right--;
}
}
}

/* TC: O(n), SC: O(1) */
``````
Python:

``````class Solution:
def reverseString(self, s: List[str]) -> None:
"""
Do not return anything, modify s in-place instead.
"""
s[:] = s[::-1]
return s
``````

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