Compilare: main.cpp: In function 'void insert(Trie*, std::string, int)': main.cpp:26:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (int i = 0; i < s.length(); i++) | ~~^~~~~~~~~~~~ main.cpp: In function 'void tur_euler(Trie*, int)': main.cpp:43:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for (int i = 0; i < root -> val.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~