A number after a double reversal

Math

82.0% acceptance

Feb 25, 2026

795

Reversing an integer means to reverse all its digits. For example, reversing 2021 gives 1202. Reversing 12300 gives 321 as the leading zeros are not retained. Given an integer num, reverse num to get reversed1, then reverse reversed1 to get reversed2. Return true if reversed2 equals num. Otherwise return false.

Solution

Rust

Time O(1)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn is_same_after_reversals(num: i32) -> bool {
    // A double reversal equals the original iff num == 0 OR num has no trailing zeros
    num == 0 || num % 10 != 0
  }
}