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  1. #include <algorithm>
  2. #include <vector>
  3. #include <map>
  4. #include <iostream>
  5. #include <random>
  6.  
  7. template <typename T>
  8. std::map<T, std::size_t> map_count(const std::vector<T>& v)
  9. {
  10.     std::map<T, std::size_t> res;
  11.  
  12.     for (const auto& e: v) { res[e]++; }
  13.     return res;
  14. }
  15.  
  16. template <typename T>
  17. std::pair<const T, std::size_t> find_mode(const std::map<T, std::size_t>& m)
  18. {
  19.     if (m.empty()) {throw std::runtime_error("empty map");}
  20.  
  21.     return *std::max_element(m.begin(),
  22.                              m.end(),
  23.                              [](const auto& lhs, const auto& rhs){ return lhs.second < rhs.second; }
  24.                              );
  25. }
  26.  
  27. int main()
  28. {
  29. 	std::default_random_engine engine(static_cast<unsigned>(time(NULL)));
  30. 	std::uniform_int_distribution<int> u(10, 16);
  31. 	std::vector<int> v(24);
  32.  
  33.     for (auto& e : v) {
  34.         e = u(engine);
  35.         std::cout << e << " ";
  36.     }
  37.     std::cout << std::endl;
  38.  
  39.     const auto m = map_count(v);
  40.  
  41.     std::cout << "The mode value is " << find_mode(m).first << std::endl;
  42.  
  43.     std::cout << "The modes are ";
  44.     for (const auto& p : m) {
  45.         std::cout << "{" << p.first << ", " << p.second << "} ";
  46.     }
  47.     std::cout << std::endl;
  48. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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11 16 16 16 16 13 15 10 14 15 10 13 12 12 14 14 13 15 11 15 10 16 10 13 
The mode value is 16
The modes are {10, 4} {11, 2} {12, 2} {13, 4} {14, 3} {15, 4} {16, 5}
https://ideone.com/WUwK6E
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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