Compilare: main.cpp: In member function 'void Node::add(Node*, std::string, short int)': main.cpp:19:19: warning: comparison of integer expressions of different signedness: 'short int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | while(index < s.size()) { | ~~~~~~^~~~~~~~~~ main.cpp: In member function 'void Node::del(Node*, std::string, short int)': main.cpp:34:19: warning: comparison of integer expressions of different signedness: 'short int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | while(index < s.size()) { | ~~~~~~^~~~~~~~~~ main.cpp: In member function 'void Node::printCounter(Node*, std::string, short int)': main.cpp:53:19: warning: comparison of integer expressions of different signedness: 'short int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | while(index < s.size()) { | ~~~~~~^~~~~~~~~~ main.cpp: In member function 'void Node::longestPrefix(Node*, std::string, short int)': main.cpp:61:19: warning: comparison of integer expressions of different signedness: 'short int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | while(index < s.size()) { | ~~~~~~^~~~~~~~~~ In member function 'void Node::del(Node*, std::string, short int)', inlined from 'int main()' at main.cpp:81:16: main.cpp:48:22: warning: 'i' may be used uninitialized [-Wmaybe-uninitialized] 48 | n->childs[s[i] - 'a'] = nullptr; | ^ main.cpp: In function 'int main()': main.cpp:31:17: note: 'i' was declared here 31 | short int i; | ^