题解 | #[NOIP2013]记数问题#

#include <stdio.h>

int main()
{
    int n = 0;
    int x = 0;
    scanf("%d %d", &n, &x);

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

    return 0;
}