Compilare: main.cpp: In member function 'void Trie::insert(const string&, int)': main.cpp:19:20: warning: comparison of integer expressions of different signedness: 'const int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if (index == s.size()) { | ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::find(const string&, int)': main.cpp:32:17: warning: comparison of integer expressions of different signedness: 'const int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if (index == s.size()) { | ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'void Trie::erase(const string&, int)': main.cpp:43:17: warning: comparison of integer expressions of different signedness: 'const int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | if (index == s.size()) { | ~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::get_longest_prefix(const string&, int)': main.cpp:60:17: warning: comparison of integer expressions of different signedness: 'const int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | if (index == s.size()) { | ~~~~~~^~~~~~~~~~~