题解 | 记数问题

#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
using namespace std;
int N = 1001;
int T = 10e5;
void solve() {
    int n, x;
    cin >> n >> x;
    int cnt = 0;
    for (int i = 1 ; i <= n ; i ++) {
        int temp = i;
        while (temp) {
            if (temp % 10 == x) cnt ++;
            temp /= 10;
        }
    }
    cout << cnt;

}
int main() {
    int t  = 1;
    // cin >> t;
    while (t--) {
        solve();
    }


    return 0;
}