Compilare: main.cpp: In member function 'void Trie::_update(Trie::Node*&, const string&, int, int, int)': main.cpp:55:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 55 | if (p == s.size()) { | ~~^~~~~~~~~~~ main.cpp: In member function 'void Trie::_query(Trie::Node*, std::string&, int, int)': main.cpp:75:31: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} and 'int' [-Wsign-compare] 75 | while (ans.size() < ans_size) | ~~~~~~~~~~~^~~~~~~~~~ main.cpp:78:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} and 'int' [-Wsign-compare] 78 | if (ans.size() == ans_size) | ~~~~~~~~~~~^~~~~~~~~~~