reverse-integer/

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Reverse integer

Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-2^31, 2^31 -1], then return 0.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

Examples:

Input: x = 123
Output: 321

Input: x = -123
Output: -321

Input: x = 120
Output: 21

Constraints:

-2^31 <= x <= 2^31 - 1