题解 | #[NOIP2013]记数问题#

#include <stdio.h>

int main()
{
    int n = 0;
    int x = 0;
    int count = 0;
    scanf("%d %d", &n, &x);
    while(n)
    {
        int tmp = n;
        while(tmp)
        {
            if(tmp % 10 == x)
            {
                count++;
            }
            tmp/=10;
        }
        n--;
    }
    printf("%d\n", count);
    return 0;
}