Compilare: main.cpp: In member function 'void TRIE::add(std::string&, int, NODE*)': main.cpp:40:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if (ind==s.size()){ | ~~~^~~~~~~~~~ main.cpp: In member function 'void TRIE::del(std::string&, int, NODE*)': main.cpp:50:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | if (ind==s.size()){ | ~~~^~~~~~~~~~ main.cpp: In member function 'int TRIE::app(std::string&, int, NODE*)': main.cpp:57:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | if (ind==s.size()) | ~~~^~~~~~~~~~ main.cpp: In member function 'int TRIE::pref(std::string&, int, NODE*)': main.cpp:66:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | if (ind==s.size()) | ~~~^~~~~~~~~~