Compilare: main.cpp: In function 'void add(trie*, int)': main.cpp:20:12: 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(pos == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'void del(trie*, int)': main.cpp:33:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if(pos == s.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'int queryap(trie*, int)': main.cpp:46:12: 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(pos == s.size()) | ~~~~^~~~~~~~~~~ main.cpp: In function 'int querylg(trie*, int)': main.cpp:55:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if(pos == s.size()) | ~~~~^~~~~~~~~~~