Compilare: main.cpp: In function 'void ins(trie*, std::string, int)': main.cpp:16:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | if (ct==s.size()) | ~~^~~~~~~~~~ main.cpp: In function 'bool del(trie*, std::string, int)': main.cpp:30:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | if (ct==s.size()) | ~~^~~~~~~~~~ main.cpp: In function 'int que(trie*, std::string, int)': main.cpp:46:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if (ct==s.size()) | ~~^~~~~~~~~~ main.cpp: In function 'int pre(trie*, std::string, int)': main.cpp:54:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | if (ct==s.size() || nod->fii[s[ct]-'a']==0) | ~~^~~~~~~~~~