# Algorithm Puzzles: Reverse Integer

Algorithm Puzzles ~~everyday~~ ~~every week~~ sometimes: Reverse Integer

## Puzzle

Puzzle from leetcode:

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 store integers within the 32-bit signed integer range: [−231, 231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

## Solution

This puzzle is ez to solve if you considered possible overflow at the very beginning. I’d like to using string to do reverse process, which should be no overflow during reverse, after reversing then do overflow check. Considering that the range of int32_t is *[-2147483648, 2147483647]*, we need to check the value after reversing is in this range or not.

1 | class Solution |

Result I got:

One shot pass~~