Compilare: main.cpp: In member function 'void Hash::build(const std::string&)': main.cpp:17:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | for(int i = 1; i < word.size(); i++) | ~~^~~~~~~~~~~~~