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  1. #include <iostream>
  2. #include <queue>
  3. #include <cmath>
  4.  
  5. class C {
  6. private:
  7.   double a, b;
  8. public:
  9.   C() {}
  10.   C(double a, double b) { this->a = a; this->b = b; }
  11.   friend double myabs(C c) { return sqrt(c.a * c.a + c.b * c.b); }
  12.   friend std::ostream &operator<<(std::ostream &s, C &c) {
  13.     s << '(' << c.a << ',' << c.b << ')';
  14.     return s;
  15.   }
  16. };
  17.  
  18. class CCompare {
  19. public:
  20.   bool operator()(C &r, C &s) { return myabs(r) < myabs(s); }
  21. };
  22.  
  23. int main() {
  24.   C c;
  25.   std::priority_queue<C, std::vector<C>, CCompare> pq;
  26.   pq.push(C(3, 1));
  27.   pq.push(C(4, 1));
  28.   pq.push(C(5, 9));
  29.   pq.push(C(2, 6));
  30.   pq.push(C(5, 3));
  31.   while (!pq.empty()) {
  32.     c = pq.top();
  33.     pq.pop();
  34.     std::cout << c << std::endl;
  35.   }
  36.   return 0;
  37. }
  38.  
  39.  
Success #stdin #stdout 0s 2876KB
comments (?)
stdin
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Standard input is empty
stdout
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(5,9)
(2,6)
(5,3)
(4,1)
(3,1)
https://ideone.com/Hi50Xi
language:
C++ 4.3.2 (gcc-4.3.2)
created:
7 years ago
visibility:
public

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