Compilare: main.cpp: In member function 'void Trie::insert_word(std::string&)': main.cpp:21:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (int i = 0; i < word.size(); ++i) { | ~~^~~~~~~~~~~~~ main.cpp: In member function 'void Trie::erase_word(std::string&, int)': main.cpp:36:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | if (index == word.size()) { | ~~~~~~^~~~~~~~~~~~~~ main.cpp: In member function 'int Trie::count_word(std::string&)': main.cpp:51:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (int i = 0; i < word.size() && current_node; ++i) | ~~^~~~~~~~~~~~~ main.cpp: In member function 'int Trie::longest_common_prefix(std::string&)': main.cpp:63:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int i = 0; i < word.size(); ++i) { | ~~^~~~~~~~~~~~~