2016中国大学生程序设计竞赛 - 网络选拔赛 1001 A water problem hdu5832

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   Author UESTC   Source 2016中国大学生程序设计竞赛 - 网络选拔赛

大整数会想到java，然而java会MLE

所以我们考虑按位读入取模，假设前面余数x，当前数位为y，那么当前位读入后余数为(x*10+y)%mod

#include<map> #include<cmath> #include<queue> #include<vector> #include<cstdio> #include<string> #include<cstring> #include<iostream> #include<algorithm> using namespace std; char x[10000001]; int main() { int k=0; while(scanf("%s",x)!=EOF) { k++; int lx=strlen(x); int mod1=0,mod2=0; int i; for(i=0;i<lx;i++) { mod1=mod1*10+x[i]-'0'; mod2=mod2*10+x[i]-'0'; mod1%=73; mod2%=137; } if(mod1==0&&mod2==0) printf("Case #%d: YES\n",k); else printf("Case #%d: NO\n",k); } return 0; }