A water problem

Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 342    Accepted Submission(s): 187 Problem Description 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   解：大数取模运算，如果同时整除73和137，也就是整除10001。 #include<stdio.h> #include<string.h> char a[10000007]; int main() { int count=1; while(gets(a)){ long long len=0; len = strlen(a); int sum=0; for(long long i=0;i<len;i++){ sum=(sum*10+a[i]-'0')%10001; } if(sum) printf("Case #%d: NO\n",count++); else printf("Case #%d: YES\n",count++); } return 0; }