题解 | 记数问题

#include <stdio.h>

int main() {
    int n, x = 0;
    int count = 0;
    scanf("%d %d",&n,&x);
    for (int i = 1; i <= n; i++) {
        int num = i;
        while (num) {
            int number = num % 10;
            if (number == x) {
                count++;
            }
            num /= 10;
        }
    }
    printf("%d",count);
    return 0;
}