size_type size() const;
size_type size() const noexcept;
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// multiset::size
#include <iostream>
#include <set>
int main ()
{
std::multiset<int> myints;
std::cout << "0. size: " << myints.size() << '\n';
for (int i=0; i<10; i++) myints.insert(i);
std::cout << "1. size: " << myints.size() << '\n';
myints.insert (5);
std::cout << "2. size: " << myints.size() << '\n';
myints.erase (5);
std::cout << "3. size: " << myints.size() << '\n';
return 0;
}0. size: 0 1. size: 10 2. size: 11 3. size: 9