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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <utility>
  4. #include <vector>
  5.  
  6. void count(std::vector<int> arr){
  7.  	std::sort(arr.begin(), arr.end());
  8.     int frequency = 1;
  9.  
  10.     for (int x =0; x < arr.size()-1; x ++){
  11.         if(arr[x]==arr[x+1]){
  12.             frequency ++;
  13.         }
  14.         else{
  15.             std::cout << arr[x] << ": " << frequency << std::endl;
  16.             frequency = 1;
  17.         }
  18.     }
  19. }
  20.  
  21. void print_frequencies(std::vector<int> v)
  22. {
  23. 	std::sort(v.begin(), v.end());
  24.  
  25. 	if (!v.empty())
  26. 	{
  27. 		auto prev = v.front();
  28. 		std::size_t freq = 1;
  29.  
  30. 		auto out = [&]{ std::cout << prev << ": " << freq << '\n' ;};
  31.  
  32. 		for (std::size_t i = 1; i<v.size(); ++i)
  33. 		{
  34. 			if (prev == v[i])
  35. 				++freq;
  36. 			else
  37. 			{
  38. 				out() ;
  39. 				prev = v[i];
  40. 				freq = 1;
  41. 			}
  42. 		}
  43. 		out();
  44. 	}
  45. }
  46.  
  47. template <typename container_t>
  48. void print(const container_t& c)
  49. {
  50. 	std::cout << "{ ";
  51.  
  52. 	for (auto& e: c)
  53. 		std::cout << e << " " ;
  54.  
  55. 	std::cout << "}\n";
  56. }
  57.  
  58. int main()
  59. {
  60. 	std::vector<int> a ;
  61. 	print(a);
  62. 	print_frequencies({});
  63.  
  64. 	std::vector<int> b = { 1, 3, 5, 7, 9, 2, 4, 6, 8, 10 };
  65. 	print(b);
  66. 	print_frequencies(b);
  67.  
  68. 	std::vector<int> c = {1, 2, 1, 3, 1, 3, 5, 1, 5, 1, 5, 1, 4, 1, 4, 1, 8};
  69. 	print(c);
  70. 	print_frequencies(c);
  71. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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{ }
{ 1 3 5 7 9 2 4 6 8 10 }
1: 1
2: 1
3: 1
4: 1
5: 1
6: 1
7: 1
8: 1
9: 1
10: 1
{ 1 2 1 3 1 3 5 1 5 1 5 1 4 1 4 1 8 }
1: 8
2: 1
3: 2
4: 2
5: 3
8: 1
https://ideone.com/okYq8p
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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