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".

分析：

代码：

class Solution {public:    string reverseString(string s) {        string t="";        for(int pos=s.length()-1;pos>=0;--pos)            t+=s[pos];        return t;    }};