Compilare: main.cpp: In function 'trie* insert(trie*, std::string, int)': main.cpp:10:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | if (poz == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'trie* erase(trie*, std::string, int)': main.cpp:24:17: 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 find(trie*, std::string, int)': main.cpp:37:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | if (poz == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'int prefix(trie*, std::string, int)': main.cpp:47:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | if (poz == s.size() || !x->v[s[poz] - 'a']) { | ~~~~^~~~~~~~~~~