Compilare: main.cpp: In member function 'void Trie::insert(std::string&, int)': main.cpp:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | if(pos==s.size()) cnt++ ; | ~~~^~~~~~~~~~ main.cpp: In member function 'void Trie::sterge(std::string&, int)': main.cpp:24:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if(pos==s.size()) cnt-- ; | ~~~^~~~~~~~~~ main.cpp: In member function 'int Trie::count(std::string&, int)': main.cpp:37:15: 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(pos==s.size()) return cnt ; | ~~~^~~~~~~~~~ main.cpp: In member function 'int Trie::prefix(std::string&, int)': main.cpp:43:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | if(pos==s.size() || !next[s[pos]-'a']) return 0 ; | ~~~^~~~~~~~~~