题解 | 记数问题

#include <stdio.h>

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