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  1. import java.util.Scanner;
  2.  
  3. public class Main {
  4. 	public static void main (String[] args) {
  5. 		Scanner scanner = new Scanner(System.in);
  6. 		int l = scanner.nextInt();
  7. 		int n = scanner.nextInt();
  8. 		int k = scanner.nextInt();
  9. 		int count = 0;
  10. 		for(int i=0; i<n; i++) {
  11. 			int x1 = scanner.nextInt();
  12. 			int y1 = scanner.nextInt();
  13. 			int x2 = scanner.nextInt();
  14. 			int y2 = scanner.nextInt();
  15. 			if(x1*x1+y1*y1<=l*l||x2*x2+y2*y2<=l*l)
  16. 				count++;
  17. 			else {
  18. 			 	int a, b, c;
  19. 		    	int deltaX=x2-x1;
  20. 				int deltaY=y2-y1;
  21. 		    	a=deltaY;
  22. 		    	b=-deltaX;
  23. 		    	c=y1*deltaX-x1*deltaY;
  24. 		    	if(c*c<=l*l*(a*a+b*b)&&(-c*b<=(b*b+a*a)*Math.max(y2, y1)&&-c*b>=(b*b+a*a)*Math.min(y2, y1)))
  25. 		        	count++;
  26. 			}
  27. 		}
  28. 		System.out.println(count/k+1);
  29. 	}
  30. }
Success #stdin #stdout 0.07s 2184192KB
comments (?)
stdin 
4 4 2
1 1 -1 3
2 2 4 2
-3 -4 -3 4
1 -5 4 -4
stdout 
2
https://ideone.com/yQ9khw
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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