Compilare: main.cpp: In function 'void add(Node*&, std::string, long long int)': main.cpp:15:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | if(dep==s.size()-1) {node->ends++;return;} | ~~~^~~~~~~~~~~~ main.cpp: In function 'void del(Node*&, std::string, long long int)': main.cpp:22:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if(dep==s.size()-1) {node->ends--;return;} | ~~~^~~~~~~~~~~~ main.cpp: In function 'long long int query(Node*, std::string, long long int)': main.cpp:30:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if(dep==s.size()-1) return node->ends; | ~~~^~~~~~~~~~~~ main.cpp: In function 'long long int pref(Node*, std::string, long long int)': main.cpp:37:11: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if(dep==s.size()-1) return 1; | ~~~^~~~~~~~~~~~