#344. Reverse String
Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "hello", return "olleh".
题解：回文串，没什么好说的好像。
class Solution { public: string reverseString(string s) { char temp; int from=0; int to=s.size()-1; while(from<to) { temp=s[from]; s[from++]=s[to]; s[to--]=temp; } return s; } };
原文：http://www.cnblogs.com/fengxw/p/6084094.html