Reverse Integer
Updated Jan 31, 2026
Problem
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).
Constraints
- -2^31 <= x <= 2^31 - 1
Examples
Example 1
Input:
x = 123
Output:
321
Example 2
Input:
x = -123
Output:
-321
Example 3
Input:
x = 120
Output:
21
Trailing zeros are removed.
Function Signature
def reverse(self, x: int) -> int
How to Submit
Implement a Solution class with a reverse method.
Your method will be called with the input parameters and should return the answer.