Compilare: main.cpp: In function 'void add(trie*, int, std::string&)': main.cpp:24:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if(poz==s.size()){ | ~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(i=0;i<si.size();i++){ | ~^~~~~~~~~~