题解 | 记数问题

#include <stdio.h>

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

}