A water problem HDU

　Two planets named Haha and Xixi in the universe and they were created with the universe beginning. 

　There is 73 days in Xixi a year and 137 days in Haha a year. 

　Now you know the days N after Big Bang, you need to answer whether it is the first day in a year about the two planets.

Input

　There are several test cases(about 5 huge test cases). 

　For each test, we have a line with an only integer N(0≤N), the length of N is up to 10000000.

Output

　For the i-th test case, output Case #i: , then output "YES" or "NO" for the answer.

Sample Input

10001
0
333

Sample Output

Case #1: YES
Case #2: YES
Case #3: NO

题意：

若输入数字能整除73和137，输出YES；否则NO

输入数字位数上限为1e7

思路：

单看数据范围就知道一定要用字符串操作，大数相除，模拟除法运算过程即可

#include <stdio.h>
#include <string.h>

char a[10000005];

int main()
{
    int i, len, flag1, flag2;
    int x = 73, y = 137, t;
    int cas = 0;

    while(~scanf("%s", a))
    {
        len = strlen(a);
        t = 0;
        flag1 = 0;
        flag2 = 0;

        for(i = 0; i < len; i++)
        {
            t = (t * 10 + a[i] - '0') % x;
        }
        if(t==0) flag1 = 1;

        t = 0;
        for(i = 0; i < len; i++)
        {
            t = (t * 10 + a[i] - '0') % y;
        }
        if(t==0) flag2 = 1;

        if(flag1 && flag2) printf("Case #%d: YES
", ++cas);
        else printf("Case #%d: NO
", ++cas);
    }
    return 0;
}