python/TangDou/CSP-J/AcWingTraining/T4/453.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, x;
    cin >> n >> x;

    int res = 0;
    for (int i = 1; i <= n; i++)
        for (int j = i; j; j /= 10)
            if (j % 10 == x)
                res++;

    cout << res << endl;
    return 0;
}