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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
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Standard input is empty
stdout
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(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:
6 years ago
visibility:
public

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