题意：求2000.1.1（周六）过n天后，是哪年哪月哪日星期几

思路：看到过好多次了这种题，细心点模拟就是了

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;

char w[7][10]={"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" ,"Saturday"};  
int m[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};  
int yd[2]={365,366};  
long long day;

int main(){
	int year,month,week;
	while (scanf("%lld", &day) != EOF && day!=-1){
		week = (day+6)%7;
		year = 2000;
		int flag = (year%4==0 && year%100!=0)||year%400==0;
		++day;
		while (day > yd[flag]){
			day -= yd[flag];
			year++;
			flag = (year%4==0 && year%100!=0)||year%400==0;
		}
		for (month = 1; day > m[flag][month]; month++)
			day -= m[flag][month];
		printf("%d-%02d-%02lld %s\n",year,month,day,w[week]);
	}
	return 0;
}