Compilare: user.cpp: In member function ‘int Hash<T>::h(std::string) [with T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >]’: user.cpp:85: instantiated from ‘bool Hash<T>::insert(const T&) [with T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >]’ user.cpp:160: instantiated from here user.cpp:61: warning: comparison between signed and unsigned integer expressions