Compilare: main.cpp: In member function 'void Trie::insert(const std::string&, Node*&, int)': main.cpp:18:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | if (ptr == str.size()) { | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'void Trie::remove(const std::string&, Node*&, int)': main.cpp:31:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if (ptr == str.size() - 1) { | ~~~~^~~~~~~~~~~~~~~~~ main.cpp: In member function 'int Trie::max_prefix(const std::string&, Node*, int, int)': main.cpp:54:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | if (ptr == str.size() || node == nullptr) return len - 1; | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int Trie::count(const std::string&)': main.cpp:69:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 69 | while (ptr != str.size() && node != nullptr) { | ~~~~^~~~~~~~~~~~~