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  1. #include <iostream>
  2. #include <stdio.h>
  3. using namespace std;
  4.  
  5. struct point { int x, y; };
  6.  
  7. double g(struct point a, struct point b, struct point k){
  8. 	return (k.x - a.x) * (b.y - a.y) - (k.y - a.y) * (b.x - a.x);
  9. } // определяем местоположение точки K относительно прямой АВ
  10.  
  11. bool f(struct point a, struct point b, struct point c, struct point k){
  12. 	return g(a, b, c) * g(a, b, k) >= 0;
  13. }
  14.  
  15. int main() {
  16. 	struct point a { 1, 4 }, b { 5, -4 }, c { -5, -3 };
  17. 	int x, y;
  18. 	struct point k { k.x, k.y };
  19. 	cin >> k.x >> k.y;
  20. 	cout << ((f(a,b,c,k) && f(b,c,a,k) && f(c,a,b,k)) ? "yes" : "no");
  21. 	return 0;
  22.  
  23. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/rvzSpJ
1 4 5 -4 -5 -3 -13 -3
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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