344. Reverse String

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = “hello”, return “olleh”.

class Solution {public:    string reverseString(string s) {        int i = 0;        int j = s.length() - 1;        while(i < j)        {            swap(s[i++],s[j--]);        }        return s;    }};