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 j = s.size()-1, i = 0;
        while(i < j)
        {
        swap(s[i++], s[j--]);
        }
        
        return s;
        
    }
};