Compilare: main.cpp: In member function 'void trie::insertKey(const string&)': main.cpp:75:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (int i = 0; i < key.size(); i++) | ~~^~~~~~~~~~~~ main.cpp: In member function 'void trie::query(const string&)': main.cpp:127:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 127 | for (int i = 0; i < text.size(); i++) | ~~^~~~~~~~~~~~~