Compilare: main.cpp: In member function 'void Trie::insert(const std::string&, int)': main.cpp:24:16: 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 == k.size()) | ~~~~^~~~~~~~~~~ main.cpp:26:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | if(pos != k.size()) | ~~~~^~~~~~~~~~~ main.cpp: In member function 'void Trie::erase(const std::string&, int)': main.cpp:37:16: 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 == k.size()) | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::count(const std::string&, int)': main.cpp:52:16: 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 == k.size()) | ~~~~^~~~~~~~~~~ main.cpp: In member function 'int Trie::prefix(const std::string&, int)': main.cpp:61:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | if(pos == k.size()) | ~~~~^~~~~~~~~~~