Compilare: main.cpp: In member function 'void trie::insert(const std::string&, ll)': main.cpp:19:9: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if(p==s.size())return cnt++,void(); | ~^~~~~~~~~~ main.cpp: In member function 'void trie::erase(const std::string&, ll)': main.cpp:25:9: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if(p==s.size())return cnt--,void(); | ~^~~~~~~~~~ main.cpp: In member function 'll trie::count(const std::string&, ll)': main.cpp:30:9: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if(p==s.size())return cnt; | ~^~~~~~~~~~