题目7 Day of Week

 1 import java.util.Arrays;
 2 import java.util.Comparator;
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 import java.util.Scanner;
 6
 7 public class Main{
 8     public static void main(String[]args){
 9         Map<String, Integer> Month2Int=new HashMap<String, Integer>();
10         Month2Int.put("January", 1);
11         Month2Int.put("February", 2);
12         Month2Int.put("March", 3);
13         Month2Int.put("April", 4);
14         Month2Int.put("May", 5);
15         Month2Int.put("June", 6);
16         Month2Int.put("July", 7);
17         Month2Int.put("August", 8);
18         Month2Int.put("September", 9);
19         Month2Int.put("October", 10);
20         Month2Int.put("November", 11);
21         Month2Int.put("December", 12);
22         Map<Integer, String> int2Week=new HashMap<Integer, String>();
23         int2Week.put(1, "Sunday");
24         int2Week.put(2, "Monday");
25         int2Week.put(3, "Tuesday");
26         int2Week.put(4, "Wednesday");
27         int2Week.put(5, "Thursday");
28         int2Week.put(6, "Friday");
29         int2Week.put(7, "Saturday");
30
31         Date t=new Date();
32         t.year=0;
33         t.month=1;
34         t.day=1;
35         int count=0;
36         while(t.year!=3001){
37             buf[t.year][t.month][t.day]=count;
38             t.nextDate();
39             count++;
40         }
41
42         Scanner in=new Scanner(System.in);
43         while(in.hasNext()){
44             int day=in.nextInt();
45             String month=in.next();
46             int year=in.nextInt();
47             int month_=Month2Int.get(month);
48
49             int x1=buf[year][month_][day];
50             int x2=buf[2015][9][9];
51             int c=x1-x2+3;
52             c=(c%7+7)%7;
53             c++;
54             System.out.println(int2Week.get(c));
55         }
56      }
57     private static int isYeap(int x){
58         if(x%4==0&&x%100!=0||x%400==0) return 1;
59         else return 0;
60     }
61     private static int[][]dayOfMonth={
62             {0,0},
63             {31,31},
64             {28,29},
65             {31,31},
66             {30,30},
67             {31,31},
68             {30,30},
69             {31,31},
70             {31,31},
71             {30,30},
72             {31,31},
73             {30,30},
74             {31,31}
75     };
76     private static class Date{
77         int year;
78         int month;
79         int day;
80         void nextDate(){
81             day++;
82             if(day>dayOfMonth[month][isYeap(year)]){
83                 day=1;
84                 month++;
85             }
86             if(month>12){
87                 month=1;
88                 year++;
89             }
90         }
91     }
92     private static int[][][]buf=new int[3001][13][32];
93 }