#include <string>
std::begin | returns an iterator to the beginning of a container
std::end | returns an iterator to the end of a container
std::size | returns the length of string
std::to_string | converts a number to string
std::stoi | converts a string to a signed integer
std::getline | read data from an I/O stream into a string
std::swap | specializes the std::swap algorithm
std::empty | checks whether the container is empty