Compilare: main.cpp: In function 'void add(Node&, const string&, int)': main.cpp:17:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | if (p >= s.size()) { | ~~^~~~~~~~~~~ main.cpp: In function 'bool remove(Node&, const string&, int)': main.cpp:27:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if (p >= s.size()) { | ~~^~~~~~~~~~~ main.cpp: In function 'int count(const Node&, const string&)': main.cpp:46:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (int p = 0; p < s.size(); p++) { | ~~^~~~~~~~~~ main.cpp: In function 'int maxLen(const Node&, const string&)': main.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for (int p = 0; p < s.size(); p++) { | ~~^~~~~~~~~~