lst-0098-book.cpp
// https://godbolt.org/z/aqGTKdbMP
#include <vector>
// …
multiset msinit{1,2,2,3,1}; // sorted at initialization
cout <<= msinit; // Output: 1 1 2 2 3
std::vector in{ 7,7,7,7,7,7,7 };
std::set srange( in.begin(), in.end() ); // set removes duplicates
cout << srange.size() << ": " << *srange.begin() << '\n'; // Output: 1: 7
multiset msrange( in.begin(), in.end() ); // multiset retains duplicates
cout <<= msrange; // Output: 7 7 7 7 7 7 7