Compilare: main.cpp: In member function 'void trie::insert(const std::string&, ll)': main.cpp:20:9: 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] 20 | if(p==s.size())return cnt++,void(); | ~^~~~~~~~~~ main.cpp: In member function 'void trie::erase(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--,void(); | ~^~~~~~~~~~ main.cpp: In member function 'll trie::count(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())return lvs; | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:12: 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] 47 | for(i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:39:12: warning: unused variable 'j' [-Wunused-variable] 39 | ll n,m,i,j,k,l; | ^ main.cpp:39:14: warning: unused variable 'k' [-Wunused-variable] 39 | ll n,m,i,j,k,l; | ^ main.cpp:39:16: warning: unused variable 'l' [-Wunused-variable] 39 | ll n,m,i,j,k,l; | ^