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  1. #include <iostream>
  2. #include <fstream>
  3. /* run this program using the console pauser or add your own getch, system("pause") or input loop */
  4. using namespace std;
  5. int main(int argc, char** argv) {
  6.  
  7. 	int x0=1,x1=0,x2=5,x3=0,y0=1,y1=0,y2=0,y3=5;
  8. 	double R1,R2,R3;
  9. 	string ResStr;
  10.  
  11. 	ifstream file("trian.dat");
  12. 	/*if (!file.is_open()) {
  13. 		cout<<"file not open";
  14. 		return 1;
  15. 	}*/	
  16. 	file>>x1>>y1;
  17. 	file>>x2>>y2;
  18. 	file>>x3>>y3;
  19. 	file>>x0>>y0;
  20. 	file.close();
  21.  
  22. 	/*cout<<x1<<" "<<y1<<endl;
  23. 	cout<<x2<<" "<<y2<<endl;
  24. 	cout<<x3<<" "<<y3<<endl;
  25. 	cout<<x0<<" "<<y0<<endl;*/
  26.  
  27. 	R1=(x1 - x0) * (y2 - y1) - (x2 - x1) * (y1 - y0);
  28. 	R2=(x2 - x0) * (y3 - y2) - (x3 - x2) * (y2 - y0);
  29. 	R3=(x3 - x0) * (y1 - y3) - (x1 - x3) * (y3 - y0);
  30. 	//cout<<R1<<" "<<R2<<" "<<R3<<endl;
  31.  
  32. 	ofstream file1("trian.sol");
  33. 	/*if (!file1.is_open()) {
  34. 		cout<<"file not open";
  35. 		return 1;
  36. 	}*/
  37.  
  38. 	if ((R1>=0 && R2>=0 && R3>=0)||(R1<=0 && R2<=0 && R3<=0)) {
  39. 		ResStr="YES";
  40. 	} else
  41. 		ResStr="NO";
  42.  
  43. 	/*file1<<ResStr;
  44. 	file1.close();
  45. */
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 16064KB
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https://ideone.com/vU0x82
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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