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// unordered_set::erase
#include <iostream>
#include <string>
#include <unordered_set>
int main ()
{
std::unordered_set<std::string> myset =
{"USA","Canada","France","UK","Japan","Germany","Italy"};
myset.erase ( myset.begin() ); // erasing by iterator
myset.erase ( "France" ); // erasing by key
myset.erase ( myset.find("Japan"), myset.end() ); // erasing by range
std::cout << "myset contains:";
for ( const std::string& x: myset ) std::cout << " " << x;
std::cout << std::endl;
return 0;
}
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