Compilare: main.cpp: In member function 'void Trie::Ad(std::string)': main.cpp:46:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (i = 0; i < w.length(); i++) | ~~^~~~~~~~~~~~ main.cpp: In member function 'void Trie::Sterge(std::string)': main.cpp:64:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for (i = 0; i < w.length(); i++) | ~~^~~~~~~~~~~~ main.cpp: In member function 'int Trie::NrAp(std::string)': main.cpp:77:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for (i = 0; i < w.length(); i++) | ~~^~~~~~~~~~~~ main.cpp: In member function 'int Trie::Prefix(std::string)': main.cpp:90:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 90 | for (i = 0; i < w.length(); i++) | ~~^~~~~~~~~~~~