Compilare: main.cpp: In member function 'void trie::add(int, std::string&)': main.cpp:16:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | if(poz == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void trie::del(int, std::string&)': main.cpp:27:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if(poz == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int trie::nrapp(int, std::string&)': main.cpp:37:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if(poz == s.size()) return e; | ~~~~^~~~~~~~~~~