Compilare: main.cpp: In member function 'void Trie::add(const string&, int)': main.cpp:21:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) ~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::cnt(std::__cxx11::string&, int)': main.cpp:49:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == s.size()) ~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:92:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) ~~^~~~~~~~~~