Reverse String
Write a function that reverses a string. The input string is given as an array of characters char[] . Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. You may assume all the characters consist of printable ascii characters . Example 1: Input: ["h","e","l","l","o"] Output: ["o","l","l","e","h"] Example 2: Input: ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"] class Solution { public void reverseString(char[] s) { int start = 0, end = s.length-1; while(start < end){ char temp = s[end]; s[end] = s[start]; s[start] = temp; start++; end--; } } } Try it