HDU 2133 What day is it

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What day is it

Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2705 Accepted Submission(s): 792

Problem Description

Today is Saturday, 17th Nov,2007. Now, if i tell you a date, can you tell me what day it is ?

Input

There are multiply cases.
One line is one case.
There are three integers, year(0<year<10000), month(0<=month<13), day(0<=day<32).

Output

Output one line.
if the date is illegal, you should output "illegal". Or, you should output what day it is.

Sample Input

2007 11 17

Sample Output

Saturday

#include <iostream>using namespace std;int main(){    int d,m,y;    int month[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},                      {0,31,29,31,30,31,30,31,31,30,31,30,31}};    while(cin>>y>>m>>d)    {        int sum=d;        int leap=y%4==0&&y%100!=0||y%400==0;         for(int i=0;i<m;i++)          sum+=month[leap][i];        if(m==2)         {            if(leap==0&&d>28)           {             cout<<"illegal"<<endl;             continue;           }           if(leap&&d>29)           {             cout<<"illegal"<<endl;             continue;           }         }         if((m==1||m==3||m==5||m==7||m==8||m==10||m==12)&&d>31)         {             cout<<"illegal"<<endl;             continue;         }          if((m==4||m==6||m==9||m==11)&&d>30)          {              cout<<"illegal"<<endl;              continue;          }          if(m==0||d==0)          {              cout<<"illegal"<<endl;              continue;          }         for(int i=1;i<y;i++)         {            int leap=i%4==0&&i%100!=0||i%400==0;            sum+=((365+leap)%7);         }            int k=sum%7;            if(k==1) cout<<"Monday"<<endl;            else if(k==2) cout<<"Tuesday"<<endl;            else if(k==3) cout<<"Wednesday"<<endl;            else if(k==4) cout<<"Thursday"<<endl;            else if(k==5) cout<<"Friday"<<endl;            else if(k==6) cout<<"Saturday"<<endl;            else cout<<"Sunday"<<endl;    }}