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  1. #include <iostream>
  2. #include <vector>
  3. #include <map>
  4. #include <regex>
  5. #include <algorithm>
  6.  
  7. int main() {
  8.     std::vector<std::string> Arr = {"1.1", "2.4.5", "1.1.1", "3.4"};
  9.     std::map<std::string, std::string> Tmp;
  10.  
  11.     std::regex re(R"((.+?)\.\d)");
  12.     std::smatch match;
  13.  
  14.     for (const auto& i : Arr) {
  15.         Tmp[i] = "*";
  16.         std::string j = i;
  17.         while (std::regex_search(j, match, re)) {
  18.             j = match.str(1);
  19.             Tmp[j] = "*";
  20.         }
  21.     }
  22.  
  23.     std::vector<std::string> Res;
  24.     for (const auto& pair : Tmp) {
  25.         Res.push_back(pair.first);
  26.     }
  27.  
  28.     std::sort(Res.begin(), Res.end(), [](const std::string& a, const std::string& b) {
  29.         return (a.length() == b.length()) ? a < b : a.length() > b.length();
  30.     });
  31.  
  32.     for (const auto& item : Res) {
  33.         std::cout << item << std::endl;
  34.     }
  35.  
  36.     return 0;
  37. }
Success #stdin #stdout 0.01s 5300KB
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stdin
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Standard input is empty
stdout
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1.1.1
2.4.5
1.1
3.4
1
2
3
https://ideone.com/96ifZV
language:
C++14 (clang 8.0)
created:
337 days ago
visibility:
secret

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