2165 日期

#include<iostream>
using namespace std;
char week[7]={'A','B','C','D','E','F','G'};
int year[2]={365,366};
int month[2][12]={31,28,31,30,31,30,31,31,30,31,30,31,31,29,31,30,31,30,31,31,30,31,30,31};
int main()
{
	int y,m;
	int sum=26;
	int judge=10;
	for(y=2016;y>2008;y--)
	{
		if(judge==10)
		{
		
			for(m=judge;m>=1;m--)
			{
				if((y%4==0 && y%100!=0) || y%400==0)
				sum+=month[1][m-1];
				else
				sum+=month[0][m-1];
		
			}
		}
		else
		{
			if((y%4==0 && y%100!=0) || y%400==0)
				sum+=year[1];
			else
				sum+=year[0];
		}
		judge=12;
	}
	if(y==2008)
	{
		for(m=12;m>=8;m--)
		{
			if((y%4==0 && y%100!=0) || y%400==0)
				sum+=month[1][m-1];
			else
				sum+=month[0][m-1];
		}
	}
	sum-=8;
	int s;
	s=sum%7;
	s=7-s;
	s=s%7;
	cout<<week[s]<<endl;
	return 0;
}