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  1. #include <iostream>
  2. #include <vector>
  3. #include <cmath>
  4. #include <algorithm>
  5.  
  6. struct Triangle
  7. {
  8. 	double a, b, c;
  9. 	double perimeter, area;
  10.  
  11. 	Triangle(double in_a, double in_b, double in_c, double in_p, double in_area) : a(in_a), b(in_b), 
  12. 		c(in_c), perimeter(in_p), area(in_area) {};
  13. };
  14.  
  15. class Trinagles
  16. {
  17. 	std::vector<Triangle> triangles;
  18.  
  19. public:
  20. 	void add( double a, double b, double c )
  21. 	{
  22. 		if (a >= b + c || b >= a + c || c >= a + b || a <= 0 || b <= 0 || c <= 0)
  23. 			return;
  24.  
  25. 		int p = (a + b + c) / 2;
  26. 		triangles.push_back(Triangle(a, b, c, a + b + c, sqrt(p * (p - a) * (p - b) * (p - c))));
  27. 	}
  28.  
  29. 	void ans()
  30. 	{
  31. 		sort (triangles.begin(), triangles.end(), [](Triangle a, Triangle b) {return a.perimeter < b.perimeter;});
  32. 		std::cout << "Perimeters: ";
  33. 		for (int i = 0; i < triangles.size(); i++)
  34. 			std::cout << triangles[i].perimeter << " ";
  35. 		std::cout << std::endl;
  36.  
  37. 		std::cout << "Areas: ";
  38. 		sort (triangles.begin(), triangles.end(), [](Triangle a, Triangle b) {return a.area > b.area;});
  39. 		for (int i = 0; i < triangles.size(); i++)
  40. 			std::cout << triangles[i].area << " ";
  41. 	}
  42. };
  43.  
  44. int main() {
  45. 	Trinagles t;
  46.  
  47. 	t.add(3, 5, 5);
  48. 	t.add(5, 6, 7);
  49. 	t.add(6, 7, 8);
  50. 	t.ans();
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 4404KB
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stdin
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Standard input is empty
stdout
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Perimeters: 13 18 21 
Areas: 15.4919 14.6969 4.24264
https://ideone.com/T8jRxw
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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