Compilare: main.cpp: In function 'Trie* update(std::string)': main.cpp:33:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (int i=0;i<s.size ();++i){ | ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:125:18: warning: unused variable 'prev' [-Wunused-variable] 125 | int rez=-INF,prev; | ^~~~