Compilare: main.cpp: In member function 'void Trie::insert(std::string, int)': main.cpp:28:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 28 | if(s.size() == position) ++cnt; | ~~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'void Trie::erase(std::string, int)': main.cpp:38:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 38 | if(s.size() == position) --cnt; | ~~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::count(std::string, int)': main.cpp:50:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | if(position == s.size()) return cnt; | ~~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::longestCommonPrefix(std::string, int)': main.cpp:57:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | if(position == s.size()) return 0; | ~~~~~~~~~^~~~~~~~~~~