Compilare: main.cpp: In member function 'void Trie::insert(nod*, int, std::string&)': main.cpp:25:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if(pos == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In member function 'bool Trie::erase(nod*, int, std::string)': main.cpp:40:10: 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(pos == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::word_freq(nod*, int, std::string&)': main.cpp:64:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(pos == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::longest_prefix(nod*, int, std::string&)': main.cpp:77:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | if(pos == s.size()) { | ~~~~^~~~~~~~~~~