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  1. #include <iostream>
  2. #include <map>
  3. #include <set>
  4. #include <string>
  5. using namespace std;
  6.  
  7. int main() {
  8. 	map<string, set<string>> data;
  9.     data["Key1"].emplace("hello");
  10.     data["Key1"].emplace("world");
  11.     data["Key1"].emplace("test");
  12.     data["Key2"].emplace("Ciao");
  13.     data["Key2"].emplace("Mondo");
  14.  
  15.     for (const auto& x : data) {
  16.         cout << x.first << ": ";
  17.         bool first = true;
  18.         for (const auto& s : x.second) {
  19.             if (!first) {
  20.                 cout << ", ";
  21.             } else {
  22.                 first = false;
  23.             }
  24.             cout << s;
  25.         }
  26.  
  27.         cout << endl;
  28.     }
  29.  
  30.  
  31. 	return 0;
  32. }
  33.  
Success #stdin #stdout 0s 3436KB
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stdin
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Standard input is empty
stdout
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Key1: hello, test, world
Key2: Ciao, Mondo
https://ideone.com/Vftl2x
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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