Compilare: main.cpp: In function 'void Trie::add(Node*, std::string, int)': main.cpp:22:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'void Trie::rem(Node*, std::string, int)': main.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int Trie::freq(Node*, std::string, int)': main.cpp:42:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int Trie::pref(Node*, std::string, int)': main.cpp:52:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~