Compilare: main.cpp: In member function 'void Trie::insert(const std::string&, Node*&, int)': main.cpp:16:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | if (ptr == str.size()) { | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'bool Trie::remove(const std::string&, Node*&, int)': main.cpp:30:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if (ptr == str.size()) { | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int Trie::max_prefix(const std::string&, Node*, int, int)': main.cpp:45:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | if (ptr == str.size() || node->children[str[ptr] - 'a'] == nullptr) return len; | ~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int Trie::count(const std::string&)': main.cpp:60:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | while (ptr != str.size() && node != nullptr) { | ~~~~^~~~~~~~~~~~~