Compilare: main.cpp: In function 'void add(trie*, std::string, int)': main.cpp:20:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | if(poz==s.size()) | ~~~^~~~~~~~~~ main.cpp: In function 'bool del(trie*, std::string, int, trie*)': main.cpp:35:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 35 | if(s.size()==poz) | ~~~~~~~~^~~~~ main.cpp: In function 'void apar(trie*, std::string, int)': main.cpp:57:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 57 | if(s.size()==poz) | ~~~~~~~~^~~~~ main.cpp: In function 'void pref(trie*, std::string, int)': main.cpp:72:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 72 | if(s.size()==poz) | ~~~~~~~~^~~~~