Compilare: main.cpp: In function 'void add(Node&, const string&)': main.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int p = 0; p < s.size(); p++) { | ~~^~~~~~~~~~ main.cpp: In function 'bool remove(Node&, const string&, int)': main.cpp:37:11: 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 (p >= s.size()) { | ~~^~~~~~~~~~~ main.cpp: In function 'int count(const Node&, const string&)': main.cpp:60:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int p = 0; p < s.size(); p++) { | ~~^~~~~~~~~~ main.cpp: In function 'int maxLen(const Node&, const string&)': main.cpp:73:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | for (int p = 0; p < s.size(); p++) { | ~~^~~~~~~~~~