LeetCode-in-Java

3783. Mirror Distance of an Integer

Easy

You are given an integer n.

Define its mirror distance as: abs(n - reverse(n)) where reverse(n) is the integer formed by reversing the digits of n.

Return an integer denoting the mirror distance of n.

abs(x) denotes the absolute value of x.

Example 1:

Input: n = 25

Output: 27

Explanation:

• reverse(25) = 52.
• Thus, the answer is abs(25 - 52) = 27.

Example 2:

Input: n = 10

Output: 9

Explanation:

• reverse(10) = 01 which is 1.
• Thus, the answer is abs(10 - 1) = 9.

Example 3:

Input: n = 7

Output: 0

Explanation:

• reverse(7) = 7.
• Thus, the answer is abs(7 - 7) = 0.

Constraints:

• 1 <= n <= 109

Solution

public class Solution {
    private int rev(int n) {
        int a = 0;
        while (n > 0) {
            a = a * 10 + (n % 10);
            n /= 10;
        }
        return a;
    }

    public int mirrorDistance(int n) {
        int m = rev(n);
        return Math.abs(m - n);
    }
}

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