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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. void print_vec_pair(std::vector<std::pair<int, int>>& v) {
  5.  
  6. 	for (const auto& a : v) {
  7. 		std::cout << "(" << a.first << ", " << a.second << ") ";
  8. 	}
  9. 	std::cout << std::endl;
  10. }
  11.  
  12. bool compare_pairs(std::pair<int, int>& a, std::pair<int, int>& b) {
  13.  
  14. 	if (a.second == b.second)
  15. 		return true;
  16. 	else
  17. 		return false;
  18. }
  19.  
  20. std::vector<std::pair<int, int>> decimation(std::vector<std::pair<int, int>>& data, int N) {
  21.  
  22. 	std::vector<std::pair<int, int>> res;
  23. 	int cnt = 1;
  24.  
  25. 	for (size_t i = 0; i < data.size()-1; i++) {
  26.  
  27. 		if (cnt == 1 || cnt == N) {
  28. 			res.push_back(data[i]);
  29. 			if (cnt == N) {
  30. 				cnt = 1;
  31. 			}
  32. 		}
  33.  
  34. 		if (compare_pairs(data[i], data[i + 1])) {
  35. 			cnt++;
  36. 		}
  37. 		else {
  38. 			cnt == 1;
  39. 		}
  40.  
  41. 	}
  42.  
  43. 	return res;
  44. }
  45.  
  46.  
  47. int main()
  48. {
  49. 	std::vector<std::pair<int, int>> data;
  50. 	data.push_back({ 1, 10 });
  51. 	data.push_back({ 2, 11 });
  52. 	data.push_back({ 3, 11 });
  53. 	data.push_back({ 4, 11 });
  54. 	data.push_back({ 5, 11 });
  55. 	data.push_back({ 6, 10 });
  56. 	data.push_back({ 7, 11 });
  57. 	data.push_back({ 8, 11 });
  58. 	data.push_back({ 9, 11 });
  59. 	data.push_back({ 10, 11 });
  60. 	data.push_back({ 11, 11 });
  61. 	data.push_back({ 12, 11 });
  62. 	data.push_back({ 13, 11 });
  63. 	data.push_back({ 14, 10 });
  64.  
  65. 	auto result3 = decimation(data, 3);
  66. 	auto result4 = decimation(data, 4);
  67.  
  68. 	print_vec_pair(data);
  69. 	std::cout << std::endl;
  70. 	print_vec_pair(result3);
  71. 	std::cout << std::endl;
  72. 	print_vec_pair(result4);
  73. }
Success #stdin #stdout 0s 4296KB
comments ()
stdin 
Standard input is empty
stdout 
(1, 10) (2, 11) (3, 11) (4, 11) (5, 11) (6, 10) (7, 11) (8, 11) (9, 11) (10, 11) (11, 11) (12, 11) (13, 11) (14, 10) 

(1, 10) (2, 11) (4, 11) (8, 11) (10, 11) (12, 11) 

(1, 10) (2, 11) (5, 11) (6, 10) (7, 11) (10, 11) (13, 11)
https://ideone.com/bkl7sX
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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