算法提高 日期计算

       

        

         

          

         
         

          

           import java.util.Scanner;  
          
         
        

         

          

         
         

          
  
          
         
        

         

          

         
         

          

           public class Main {  
          
         
        

         

          

         
         

          
 static int a[][] ={ { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 
          
         
        

         

          

         
         

          

            { 0, 31,28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } }; 
          
         
        

         

          

         
         

          
  
          
         
        

         

          

         
         

          
 public static voidmain(String[] args) {  
          
         
        

         

          

         
         

          

            Scanner input = new Scanner(System.in); 
          
         
        

         

          

         
         

          
 int y = input.nextInt(); 
          
         
        

         

          

         
         

          
 int m = input.nextInt(); 
          
         
        

         

          

         
         

          
 int d = input.nextInt(); 
          
         
        

         

          

         
         

          
 int week = Day(y, m, d) - Day(2011, 11, 11); 
          
         
        

         

          

         
         

          
 if (week > 0) 
          
         
        

         

          

         
         

          

            System.out.println((4 week % 7) % 7 1);  
          
         
        

         

          

         
         

          
 else {  
          
         
        

         

          

         
         

          
 for (int i= 1; i <= 7; i)  
          
         
        

         

          

         
         

          
 if ((i - 1 -week % 7) % 7 1== 5) {  
          
         
        

         

          

         
         

          

            System.out.println(i);  
          
         
        

         

          

         
         

          
 break;  
          
         
        

         

          

         
         

          

            }  
          
         
        

         

          

         
         

          

            }  
          
         
        

         

          

         
         

          

            } 
          
         
        

         

          

         
         

          
  
          
         
        

         

          

         
         

          
 public staticboolean isRun(int year) {  
          
         
        

         

          

         
         

          
 if (year % 4 == 0&& year % 100 != 0 || year % 400 ==0)  
          
         
        

         

          

         
         

          

            returntrue;  
          
         
        

         

          

         
         

          
 return false;  
          
         
        

         

          

         
         

          

            } 
          
         
        

         

          

         
         

          
  
          
         
        

         

          

         
         

          
 public static intDay(int y, int m, int d) {  
          
         
        

         

          

         
         

          
 int ans = 0;  
          
         
        

         

          

         
         

          
 for (int i = 1; i < y; i) 
          
         
        

         

          

         
         

          

            ans =calDay(i);  
          
         
        

         

          

         
         

          
 int index = 0;  
          
         
        

         

          

         
         

          
 if (!isRun(y))  
          
         
        

         

          

         
         

          

            index = 1; 
          
         
        

         

          

         
         

          
 for (int i = 1; i < m; i) 
          
         
        

         

          

         
         

          

            ans =a[index][i];  
          
         
        

         

          

         
         

          

            ans = d;  
          
         
        

         

          

         
         

          
 return ans;  
          
         
        

         

          

         
         

          

            } 
          
         
        

         

          

         
         

          
  
          
         
        

         

          

         
         

          
 public static intcalDay(int year) {  
          
         
        

         

          

         
         

          
 int index = 0;  
          
         
        

         

          

         
         

          
 if (!isRun(year))  
          
         
        

         

          

         
         

          

            index = 1; 
          
         
        

         

          

         
         

          
 int tot = 0;  
          
         
        

         

          

         
         

          
 for (int i = 1; i <= 12; i) 
          
         
        

         

          

         
         

          

            tot =a[index][i];  
          
         
        

         

          

         
         

          
 return tot;  
          
         
        

         

          

         
         

          

            } 
          
         
        

         

          

         
         

          
  
          
         
        

         

          

         
         

          

           }