Compilare: main.cpp: In function 'void inserts(trie*, std::string, int)': main.cpp:19:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if(poz == a.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In function 'bool del(trie*, std::string, int)': main.cpp:33:9: 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 == a.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In function 'int query(trie*, std::string, int)': main.cpp:51:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if(pos == a.size()){ | ~~~~^~~~~~~~~~~ main.cpp: In function 'int prefix(trie*, std::string, int, int)': main.cpp:62:9: 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(pos == a.size() || node->fi[a[pos] - 'a'] == 0){ | ~~~~^~~~~~~~~~~