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  1. #include <stdexcept>
  2. #include <algorithm>
  3. #include <vector>
  4. #include <iterator>
  5. #include <iostream>
  6. #include <type_traits>
  7.  
  8. template <typename iter_type>
  9. auto median(iter_type beg, iter_type end) -> typename std::remove_reference<decltype(*beg)>::type
  10. {
  11.     if (beg == end)
  12.         throw std::domain_error("median of empty container");
  13.  
  14.     std::sort(beg, end);
  15.  
  16.     std::size_t size = end - beg;
  17.     std::size_t mid = size / 2;
  18.  
  19.     if (size % 2)
  20.         return *(beg + mid);
  21.  
  22.     return (*(beg + mid - 1) + *(beg + mid)) / 2;
  23. }
  24.  
  25. int main()
  26. {
  27.     int arr [] = { 9, 7, 5, 3, 1, 8, 6, 4, 2 };
  28.     std::vector<double> v = { 9.1, 7.2, 5.3, 3.4, 1.5, 8.6, 6.7, 4.8, 2.9 };
  29.  
  30.     std::cout << median(std::begin(arr), std::end(arr)) << '\n';
  31.     std::cout << median(std::begin(v), std::end(v)) << '\n';
  32. }
Success #stdin #stdout 0s 3432KB
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5
5.3
https://ideone.com/FpX7gJ
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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