Compilare: main.cpp: In member function 'void Trie::insert(std::string)': main.cpp:30:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (int i=0; i<w.size(); ++i) { | ~^~~~~~~~~ main.cpp: In member function 'bool Trie::del(Trie*, std::string, int)': main.cpp:42:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (dep==w.size()) { | ~~~^~~~~~~~~~ main.cpp: In member function 'int Trie::search(std::string)': main.cpp:58:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int i=0; i<w.size(); ++i) { | ~^~~~~~~~~ main.cpp: In member function 'int Trie::prefix(std::string)': main.cpp:68:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for (int i=0; i<w.size(); ++i){ | ~^~~~~~~~~