Compilare: main.cpp: In member function 'void trie::insert(const std::string&, ll)': main.cpp:15:9: 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] 15 | if(p==s.size())return cnt++,void(); | ~^~~~~~~~~~ main.cpp: In member function 'void trie::erase(const std::string&, ll)': main.cpp:21:9: 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] 21 | if(p==s.size())return cnt--,void(); | ~^~~~~~~~~~ main.cpp: In member function 'll trie::count(const std::string&, ll)': main.cpp:26:9: 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] 26 | if(p==s.size())return cnt; | ~^~~~~~~~~~ main.cpp: In member function 'll trie::lcp(const std::string&, ll)': main.cpp:31:9: 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] 31 | if(p==s.size()||!next[s[p]-'a'])return 0; | ~^~~~~~~~~~