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Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
Input: 123
Output: 321
Example 2:
Input: -123
Output: -321
Example 3:
Input: 120
Output: 21
Note:
Assume we are dealing with an environment which could only hold integers within the 32-bit signed integer range. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
C++：
/*
@Date : 2018-01-06 13:26:27
@Author : 酸饺子 ([email protected])
@Link : https://github.com/SourDumplings
@Version : $Id$
*/
/*
https://leetcode.com/problems/reverse-integer/description/
*/
class Solution
{
public:
int reverse(int x)
{
string s = to_string(x);
std::reverse(s.begin(), s.end());
long long i = stoll(s);
if ( i > 2147483647 || i < -2147483648)
return 0;
if (x < 0)
return -i;
return i;
}
};