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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <list>
  4.  
  5. void biswap(std::list<int> &l)
  6. {
  7. 	if (l.size() < 2)
  8. 		return;
  9. 	auto it2 = l.begin();
  10. 	auto it1 = it2++;
  11. 	auto e = l.end();
  12. 	for (;;)
  13. 	{
  14. 		if (*it1 < *it2)
  15. 			std::swap(*it1, *it2);
  16. 		it1 = it2++;
  17. 		if (it2 == e)
  18. 			return;
  19. 		it1 = it2++;
  20. 		if (it2 == e)
  21. 			return;
  22. 	}
  23. }
  24.  
  25.  
  26. int main() {
  27. 	std::list<int> myList {3, 2, 1, 2, 1, 3, 2};
  28. 	biswap(myList);
  29. 	for (int i: myList)
  30. 		std::cout << i << ", ";
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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3, 2, 2, 1, 3, 1, 2,
https://ideone.com/29N4FC
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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