0344 - Reverse String

0344 - Reverse String

Write a function that reverses a string. The input string is given as an array of characters s.

Examples

Input: s = ["h","e","l","l","o"] Output: ["o","l","l","e","h"]

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.

Follow up: Do not allocate extra space for another array. You must do this by modifying the input array in-place with O(1) extra memory.

Java Solution

class Solution {
    public void reverseString(char[] s) {
        for(int i = 0; i < s.length/2; i++) {
            char temp = s[i];
            s[i] = s[s.length-1-i];
            s[s.length-1-i] = temp;       
        }
    }
}