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  1. #include <map>
  2. #include <bitset>
  3. #include <iostream>
  4.  
  5. int main() {
  6.     auto comp = [](int a, int b) { return std::bitset<32>(a).count() < std::bitset<32>(b).count(); };
  7.     std::map<int, int, decltype(comp)> m {{{13, 1}, {15, 1}, {17, 1}}, comp};
  8.  
  9.     for (auto const &p : m)
  10.         std::cout << p.first << " (" << std::bitset<32>(p.first).count() << " bits)"<< std::endl;
  11.  
  12. 	return 0;
  13. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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17 (2 bits)
13 (3 bits)
15 (4 bits)
https://ideone.com/kecYcS
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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