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// unordered_set::size
#include <iostream>
#include <string>
#include <unordered_set>
int main ()
{
std::unordered_set<std::string> myset;
std::cout << "0. size: " << myset.size() << std::endl;
myset = {"milk","potatoes","eggs"};
std::cout << "1. size: " << myset.size() << std::endl;
myset.insert ("pineapple");
std::cout << "2. size: " << myset.size() << std::endl;
myset.erase ("milk");
std::cout << "3. size: " << myset.size() << std::endl;
return 0;
}
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