题解 | 记数问题

#include <stdio.h>

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