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  1. #include <array>
  2. #include <iostream>
  3. #include <iterator>
  4. #include <map>
  5. #include <vector>
  6.  
  7. struct Sample {char value;}; 
  8.  
  9. std::vector<std::array<Sample, 3u>> get_triplets(const std::map<int, Sample>& samples)
  10. {
  11.     if (samples.size() < 3) {
  12.         return {};
  13.     }
  14.     std::vector<std::array<Sample, 3u>> res;
  15.  
  16.     auto it = samples.begin();
  17.     auto it1 = std::next(it);
  18.     auto it2 = std::next(it1);
  19.  
  20.     for (; it2 != samples.end(); ++it, ++it1, ++it2) {
  21.         res.push_back({{it->second, it1->second, it2->second}});
  22.     }
  23.     return res;
  24. }
  25.  
  26. void print(const std::array<Sample, 3u>&t)
  27. {
  28. 	for (const auto& s : t) {
  29. 		std::cout << s.value << " ";
  30. 	}
  31. 	std::cout << std::endl;
  32. }
  33.  
  34. int main() {
  35. 	std::map<int, Sample> samples{
  36. 		{15, {'a'}},
  37. 		{21, {'b'}},
  38. 		{33, {'c'}},
  39. 		{37, {'d'}},
  40. 		{49, {'e'}}
  41. 	};
  42.  
  43. 	auto triplets = get_triplets(samples);
  44.  
  45.     for (const auto& triplet : triplets) {
  46.     	print(triplet);
  47.     }
  48. }
  49.  
Success #stdin #stdout 0s 3460KB
comments (?)
stdin
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Standard input is empty
stdout
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a b c 
b c d 
c d e
https://ideone.com/bsG2Cy
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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