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  1. #include <iostream>
  2. #include <utility>
  3. #include <set>
  4. using namespace std;
  5.  
  6. using OP = pair<unsigned, unsigned>;
  7. using SOP = set<OP>; 
  8.  
  9.  
  10.  
  11. bool is_symetric (SOP sop) {
  12.  
  13.     for (auto it3 = sop.begin(); it3 != sop.end(); it3++) { // loop through each pair in set
  14.         if (it3->first != it3->second) {
  15.         	if (sop.find({it3->second,it3->first })==sop.end()) {
  16.                 return false;
  17.             }
  18.         }
  19.     }
  20.     return true; 
  21. }
  22.  
  23. int main() {
  24. 	SOP test1 { {1,3},{2,4},{5,7},{7,5}, {4,2}, {3,1} };
  25. 	SOP test2 { {1,3},{2,4},{5,7},{7,5}, {4,2}, {3,1}, {8,4} };
  26.  
  27. 	cout << is_symetric(test1)<<endl; 
  28. 	cout << is_symetric(test2)<<endl; 
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/vBg3yK
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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