题解 | #[NOIP2013]记数问题#

#include <stdio.h>
typedef unsigned int uint;

int main() {
    uint x = 0;
    uint n = 0;

    while (2 == scanf("%u %u", &n, &x))
    {
        int count = 0;

        for (int i = 1; i <= n; i++)
        {
            // 用临时变量存储i，方便进行遍历
            uint tmp = i;
            // 获取一个数字的每位一数并与数字x比较
            while (tmp)
            {
                if (tmp % 10 == x)
                {
                    count++;
                }
                tmp /= 10;
            }
        }
        printf("%u\n", count);
    }

    return 0;
}