Compilare: main.cpp: In member function 'void Trie::add(std::__cxx11::string, int)': main.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < word.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'void Trie::remove(std::__cxx11::string, int)': main.cpp:57:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < word.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int Trie::count(std::__cxx11::string, int)': main.cpp:86:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < word.size()) ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int Trie::prefix(std::__cxx11::string, int)': main.cpp:104:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < word.size()) ~~~~^~~~~~~~~~~~~