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  1. import java.util.*;
  2.  
  3. class Main{
  4. 	public static void main (String[] args) throws java.lang.Exception{
  5. 		Scanner scan = new Scanner(System.in);
  6. 		double Ua, Ub, numerator_a, numerator_b, denominator;
  7. 		double x1 = scan.nextDouble();
  8. 		double y1 = scan.nextDouble();
  9. 		double x2 = scan.nextDouble();
  10. 		double y2 = scan.nextDouble();
  11. 		double x3 = scan.nextDouble();
  12. 		double y3 = scan.nextDouble();
  13. 		double x4 = scan.nextDouble();
  14. 		double y4 = scan.nextDouble();
  15.  
  16. 		denominator=(y4-y3)*(x1-x2)-(x4-x3)*(y1-y2);
  17. 		if (denominator == 0){
  18. 			if ( (x1*y2-x2*y1)*(x4-x3) - (x3*y4-x4*y3)*(x2-x1) == 0 && (x1*y2-x2*y1)*(y4-y3) - (x3*y4-x4*y3)*(y2-y1) == 0)	System.out.print("Отрезки пересекаются");
  19. 			else System.out.print("Отрезки не пересекаются");
  20. 		}
  21. 		else{
  22. 		numerator_a=(x4-x2)*(y4-y3)-(x4-x3)*(y4-y2);
  23. 		numerator_b=(x1-x2)*(y4-y2)-(x4-x2)*(y1-y2);
  24. 		Ua=numerator_a/denominator;
  25. 		Ub=numerator_b/denominator;
  26. 		if (Ua >=0 && Ua <=1 && Ub >=0 && Ub <=1)	System.out.print("Отрезки пересекаются");
  27. 		else	System.out.print("Отрезки не пересекаются");
  28. 		}
  29. 	}
  30. }
Success #stdin #stdout 0.14s 31228KB
comments (?)
stdin 
1	1	2	2	2	2	1	1
stdout 
Отрезки пересекаются
https://ideone.com/0ZO2HO
Mif9. Пересечение отрезков.
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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