Compilare: main.cpp: In member function 'void Trie::insert(std::string, int)': main.cpp:20:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 20 | if(s.size() == position) ++cnt; | ~~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'void Trie::erase(std::string, int)': main.cpp:30:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 30 | if(s.size() == position) --cnt; | ~~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::count(std::string, int)': main.cpp:42:21: 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(position == s.size()) return cnt; | ~~~~~~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::longestCommonPrefix(std::string, int)': main.cpp:49:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | if(position == s.size()) return 0; | ~~~~~~~~~^~~~~~~~~~~