Compilare: main.cpp: In function 'void add(Node*, std::string&, int)': main.cpp:41:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'bool canRemove(Node*, std::string&, int)': main.cpp:55:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int countAppearances(Node*, std::string&, int)': main.cpp:76:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 76 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int longestPrefix(Node*, std::string&, int)': main.cpp:84:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | if (pos == word.size()) { | ~~~~^~~~~~~~~~~~~~