Compilare: main.cpp: In member function 'void trie::insert(const std::string&, int, trie*)': main.cpp:28:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if(index==s.size()) | ~~~~~^~~~~~~~~~ main.cpp: In member function 'int trie::getK(trie*, int, const std::string&, int, int)': main.cpp:37:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if(index==s.size()) | ~~~~~^~~~~~~~~~