3783. Mirror Distance of an Integer

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.

class Solution {
    long long rev(int n) {
        long long res = 0;
        while(n) {
            res = res * 10 +  (n % 10);
            n /= 10;
        }
        return res;
    }
public:
    int mirrorDistance(int n) {
        return abs(n - rev(n));
    }
};