<string>, std::basic_string, std::string
, operator <<.
std:: map insted .
std::map<std::string, int> verticies =
{
{ "AB", 0 }, { "AC", 0 }, { "AD", 0 }, { "BC", 0 }, { "BD", 0 }, { "CD", 0 }
};
, std:: pair .
{ std::pair<std::string, int>( "AB", 0 ), std::pair<std::string, int>( "AC", 0 ), ...}