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  1. #include <algorithm>
  2. #include <vector>
  3. #include <iostream>
  4.  
  5. template<typename Vector>
  6. std::vector<double> rank(const Vector& v)
  7. {
  8. 	std::vector<std::size_t> w(v.size());
  9. 	std::iota(begin(w), end(w), 0);
  10. 	std::sort(begin(w), end(w), 
  11. 		[&v](std::size_t i, std::size_t j) { return v[i] < v[j]; });
  12.  
  13. 	std::vector<double> r(w.size());
  14. 	for (std::size_t n, i = 0; i < w.size(); i += n)
  15. 	{
  16. 		n = 1;
  17. 		while (i + n < w.size() && v[w[i]] == v[w[i+n]]) ++n;
  18. 		for (std::size_t k = 0; k < n; ++k)
  19. 		{
  20. 			r[w[i+k]] = i + (n + 1) / 2.0; // average rank of n tied values
  21. 			// r[w[i+k]] = i + 1;     // min 
  22. 			// r[w[i+k]] = i + n;     // max
  23. 			// r[w[i+k]] = i + k + 1; // random order
  24. 		}
  25. 	}
  26. 	return r;
  27. }
  28.  
  29. int main()
  30. {
  31. 	std::vector<int> v = { 7, 3, 1, 3, 5 }; 
  32. 	std::vector<double> ranks = rank(v);
  33.  
  34. 	for (std::size_t i = 0; i < v.size(); ++i)
  35. 		std::cout << v[i] << " : " << ranks[i] << '\n'; 
  36.  
  37. 	return 0;
  38. }
Success #stdin #stdout 0s 3276KB
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stdin
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Standard input is empty
stdout
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7 : 5
3 : 2.5
1 : 1
3 : 2.5
5 : 4
https://ideone.com/Y3k79K
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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