Compilare: main.cpp: In function 'void insert(const std::string&, trie*, int)': main.cpp:28:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if(poz==s.size()) | ~~~^~~~~~~~~~ main.cpp: In function 'int erase(const std::string&, trie*, int)': main.cpp:41:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | if(poz==s.size()) | ~~~^~~~~~~~~~ main.cpp: In function 'void fr(const std::string&, trie*, int)': main.cpp:62:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | if(poz==s.size()) | ~~~^~~~~~~~~~ main.cpp: In function 'void query(const std::string&, trie*, int)': main.cpp:73:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | if(poz==s.size()) | ~~~^~~~~~~~~~