Java做法

import java.util.*; 
public class Main 
{
 public static void main(String[] args) 
 {
  Scanner  cin = new Scanner(System.in);
  while(cin.hasNext()){
   int a = cin.nextInt();   
   int b = cin.nextInt();
   int c = cin.nextInt();
   int d = cin.nextInt();
   int x = c-a;
   int y = d-b;
    if(y<0)
    {
        x--;
        y+=60;
    }
   System.out.print(x);
   System.out.print(" "); 
   System.out.print(y); 
  }
 }
}