题目1043：Day of Week 九度OJ

题目1043：Day of Week

时间限制：1 秒

内存限制：32 兆

特殊判题：否

提交：9211

解决：3167

题目描述：

We now use the Gregorian style of dating in Russia. The leap years are years with number divisible by 4 but not divisible by 100, or divisible by 400.
For example, years 2004, 2180 and 2400 are leap. Years 2004, 2181 and 2300 are not leap.
Your task is to write a program which will compute the day of week corresponding to a given date in the nearest past or in the future using today’s agreement about dating.

输入：

There is one single line contains the day number d, month name M and year number y(1000≤y≤3000). The month name is the corresponding English name starting from the capital letter.

输出：

Output a single line with the English name of the day of week corresponding to the date, starting from the capital letter. All other letters must be in lower case.

样例输入：

9 October 2001
14 October 2001

样例输出：

Tuesday
Sunday

提示：

Month and Week name in Input/Output:
January, February, March, April, May, June, July, August, September, October, November, December
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

来源：

2008年上海交通大学计算机研究生机试真题

#include 
#include 
#include 
#include  
#define ISLEAP(x) (x%4==0&&x%100!=0)||x%400==0 ? 1:0
using namespace std;

char week[7][15]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
char month[13][15]={"","January","February","March","April","May","June","July","August","September","October","November","December"};
int months[13][2]={
0,0,
31,31,
28,29,
31,31,
30,30,
31,31,
30,30,
31,31,
31,31,
30,30,
31,31,
30,30,
31,31
};

struct Date{
	int y,m,d;
	void nextday(){
		d++;
		if(d>months[m][ISLEAP(y)]){
			m++;
			d=1;
			if(m>12){
				y++;
				m=1;
			} 
		}	
	}
};
int buf[3001][13][33];
int main(){
	Date tmp;
	tmp.y=0;
	tmp.m=1;
	tmp.d=1;
	int cnt=0;
	while(tmp.y!=3001){//其实我们并不知道0年1月1日是星期几 
		buf[tmp.y][tmp.m][tmp.d]=cnt;
		tmp.nextday();
		cnt++;
	}
	int day,year,mon,all,dayofweek;	
	char s[15];
	while(scanf("%d%s%d",&day,s,&year)!=EOF){
		for(int i=1;i<13;i++){
			if(strcmp(s,month[i])==0){
				mon=i;break;
			}
		}
		all=buf[year][mon][day]-buf[2001][10][14];//两天的天数间隔，可能为负  
		if(all>=0){
			dayofweek=abs(all)%7;			
		}else{
			if(abs(all)%7==0){
				dayofweek=0;	
			}else{
				dayofweek=7-abs(all)%7;
			}	
		}
		cout<