std::multiset is an STL container similar to std::set, except it can contain multiple identical elements.


#include <cassert>

#include <set>



int main()

{

  std::multiset<int> s;

  s.insert(1);

  s.insert(2);

  s.insert(2);

  s.insert(3);

  s.insert(3);

  s.insert(3);

  assert(s.count(1)==1);

  assert(s.count(2)==2);

  assert(s.count(3)==3);

}

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(C++) std::multiset