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  1. #include <algorithm>
  2. #include <vector>
  3. #include <string>
  4. #include <iostream>
  5. #include <iterator>
  6.  
  7. template<class BiDirIt, class Compare = std::less<>>
  8. void merge_sort(BiDirIt first, BiDirIt last, Compare cmp = Compare{})
  9. {
  10.     auto const N = std::distance(first, last);
  11.     if (N <= 1) return;                   
  12.     auto const middle = std::next(first, N / 2);
  13.     merge_sort(first, middle, cmp); // assert(std::is_sorted(first, middle, cmp));
  14.     merge_sort(middle, last, cmp);  // assert(std::is_sorted(middle, last, cmp));
  15.     std::inplace_merge(first, middle, last, cmp); // assert(std::is_sorted(first, last, cmp));
  16. }
  17.  
  18. int main()
  19. {
  20. 	std::vector<std::string> strV = {"Test", "Big Test", "Small", "0"};
  21.  
  22. 	merge_sort(strV.begin(), strV.end(), [](const std::string& lft, const std::string& rt)
  23. 	{ return lft.size() < rt.size();});
  24.  
  25.     std::copy(strV.begin(), strV.end(), std::ostream_iterator<std::string>(std::cout, "\n"));
  26. }
Success #stdin #stdout 0s 3420KB
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Test
Small
Big Test
https://ideone.com/L11iM6
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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