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  1. #include <iostream>
  2. #include <vector>
  3. #include <tuple>
  4. #include <algorithm>
  5. using namespace std;
  6.  
  7. bool operator<(
  8. 	const tuple<int, int>& t1,
  9. 	const tuple<int, int>& t2
  10. ) {
  11. 	return get<1>(t1) > get<1>(t2);// `>` so that it gets sorted in reverse
  12. }
  13.  
  14. int main() {
  15. 	vector<tuple<int, int>> v;
  16. 	for (int i = 0; i < 10; ++i) {
  17. 		v.push_back(make_tuple(0, i));
  18. 	}
  19. 	cout << "before sort: ";
  20. 	for (auto& x : v) { cout << get<1>(x) << ", "; }
  21. 	cout << endl;
  22.  
  23. 	auto v2 = v;
  24. 	sort(v2.begin(), v2.end());
  25. 	cout << "after sort(begin, end): ";
  26. 	for (auto& x : v2) { cout << get<1>(x) << ", "; }
  27. 	cout << endl;
  28.  
  29. 	sort(v.begin(), v.end(), [](auto& t1, auto& t2) {
  30. 		return get<1>(t1) > get<1>(t2);// `>` so that it gets sorted in reverse
  31. 	});
  32. 	cout << "after sort(begin, end, comparator): ";
  33. 	for (auto& x : v) { cout << get<1>(x) << ", "; }
  34. 	cout << endl;
  35.  
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin 
Standard input is empty
stdout 
before sort: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 
after sort(begin, end): 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 
after sort(begin, end, comparator): 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
https://ideone.com/f48Cu9
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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