题解 | 记数问题

#include <stdio.h>
int a(int n, int m) {
    int count=0;
    for (int i = 1; i <= n; i++) {
        int temp = i;
        while (temp > 0) {
            if (temp % 10 == m) {
                count++;
            }
            temp = temp / 10; 
        }
    }
    return count;
}
int main() {
    int n, m, b;
    scanf("%d %d", &n, &m);
    b = a(n, m);
    printf("%d", b);
}