3895. Count Digit Appearances

You are given an integer array nums and an integer digit.

Return the total number of times digit appears in the decimal representation of all elements in nums.

class Solution {
public:
    int countDigitOccurrences(vector<int>& nums, int digit) {
        int res = 0;
        for(auto& n : nums) {
            while(n) {
                res += digit == (n % 10);
                n /= 10;
            }
        }
        return res;
    }
};