POJ 3047

题意：求某天是星期几。

题解：数学||模板

View Code

 1 #include<cstdio>

 2 #include<cstring>

 3 #include<algorithm>

 4 using namespace std;

 5 char name[][12] = { "monday", "tuesday", "wednesday",

 6                  "thursday", "friday", "saturday", "sunday"

 7                };

 8 int main(void)

 9 {

10     int d, m, y, a;

11     while(scanf("%d%d%d",&y,&m,&d)!=EOF)

12     {

13         if (m==1||m==2)

14         {

15             m+=12;

16             y--;

17         }

18         if((y<1752)||(y==1752&&m<9)||(y==1752&&m==9&&d<3))

19             a=(d+2*m+3*(m+1)/5+y+y/4+5)%7;

20         else

21             a=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7;

22         puts(name[a]);

23     }

24     return 0;

25 }