Reverse Integer

题目描述：

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

解题思路：

使用stringstream，注意翻转后的数值可能超出int范围

AC代码如下：

class Solution {public:int reverse(int x) {bool tag = false;long long int xl;if (x < 0){tag = true;xl = -x;}else{xl = x;}stringstream ss;ss << xl;string tmp = ss.str();tmp = string(tmp.rbegin(), tmp.rend());stringstream so;so << tmp;so >> xl;if (tag) xl = -xl;if (xl > INT_MAX) return 0;if (xl < INT_MIN) return 0;return xl;}};