7. Reverse Integer
MediumMath
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: 123
Output: 321
Explanation: Reversing the digits of 123 gives 321, which is within the 32-bit range.
Constraints
- -2^31 <= x <= 2^31 - 1
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