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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class Comp
  5. {
  6. public:
  7. 	bool operator()(const pair<int, int> &a, const pair<int, int> &b)
  8.     {
  9.         cout << "Custom comparator called" << endl;
  10.         return a.second > b.second;
  11.     }
  12. };
  13.  
  14. template<typename T>
  15. class custom_priority_queue_MinHeap : public std::priority_queue<T, std::vector<T>, Comp>
  16. {
  17.   public:
  18.       bool remove(const T& value) 
  19.       {
  20.         auto it = std::find(this->c.begin(), this->c.end(), value);
  21.         if (it != this->c.end())
  22.         {
  23.             this->c.erase(it);
  24.             std::make_heap(this->c.begin(), this->c.end(), this->comp);
  25.             return true;
  26.         }
  27.  
  28.         return false;
  29.     }
  30.  
  31.     bool operator()(const pair<int, int> &a, const pair<int, int> &b)
  32.     {
  33.         cout << "Custom comparator called" << endl;
  34.         return a.second > b.second;
  35.     }
  36. };
  37.  
  38. int main() {
  39. 	custom_priority_queue_MinHeap<pair<int, int>> minHeap;
  40. 	minHeap.push({0, 10});
  41. 	minHeap.push({1, 5});
  42. 	minHeap.push({2, 15});
  43.  
  44. 	while(!minHeap.empty())
  45. 	{
  46. 		pair<int, int> p = minHeap.top();
  47. 		minHeap.pop();
  48. 		cout << p.first << " " << p.second << endl;
  49. 	}
  50.  
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 4536KB
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stdin
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Standard input is empty
stdout
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Custom comparator called
Custom comparator called
Custom comparator called
1 5
0 10
2 15
https://ideone.com/1QtfYr
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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