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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <vector>
  4. using std::cout;
  5. using std::endl;
  6. using std::vector;
  7.  
  8.  
  9. class Entity
  10. {
  11. public:
  12.     Entity() : X(0), Y(0) {}
  13.     Entity(int X, int Y) : X(X), Y(Y) {}
  14.  
  15.     int X, Y;
  16. };
  17.  
  18.  
  19. struct {
  20.     Entity PlayerLocation;
  21.     vector<Entity> Entities;
  22. } fb;
  23.  
  24.  
  25. double distanceSquare(const Entity & p, const Entity & q) {
  26.     double delta_x = p.X - q.X;
  27.     double delta_y = p.Y - q.Y;
  28.     return (delta_x * delta_x + delta_y * delta_y);
  29. }
  30.  
  31. Entity & GetNearestEntity()
  32. {
  33.     return *std::min_element(fb.Entities.begin(), fb.Entities.end(),
  34.         [&fb](const Entity & a, const Entity & b) {
  35.             return distanceSquare(a, fb.PlayerLocation) <
  36.                    distanceSquare(b, fb.PlayerLocation);
  37.         }
  38.     );
  39. }
  40.  
  41. int main()
  42. {
  43.     fb.Entities.push_back(Entity(1, 3));
  44.     fb.Entities.push_back(Entity(5, 1));
  45.     fb.Entities.push_back(Entity(-4, 2));
  46.  
  47.     fb.PlayerLocation = Entity(6, 1);
  48.  
  49.     Entity & nearest = GetNearestEntity();
  50.     cout << nearest.X << "/" << nearest.Y << endl;
  51. }
  52.  
Success #stdin #stdout 0s 3016KB
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stdin 
Standard input is empty
stdout 
5/1
https://ideone.com/vKAFmx
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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