[leetcode] 344. Reverse String

题目：

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

Example:
Given s = "hello", return "olleh".

代码：

class Solution {
public:
    string reverseString(string s) {
        if(s.size() == 0) return s;
        for(int i = 0; i <= (s.size()-1)/2; i++){
            char t = s[i];
            s[i] = s[s.size()-1-i];
            s[s.size()-1-i] = t;
        }
         return s;
    }
   
};