Compilare: main.cpp: In member function 'void Trie::insertWord(Trie*, char*)': main.cpp:26:27: warning: NULL used in arithmetic [-Wpointer-arith] if(word[0] == NULL){ ^~~~ main.cpp: In member function 'bool Trie::deleteWord(Trie*, char*)': main.cpp:45:27: warning: NULL used in arithmetic [-Wpointer-arith] if(word[0] == NULL) ^~~~ main.cpp: In member function 'int Trie::getCount(Trie*, char*)': main.cpp:62:27: warning: NULL used in arithmetic [-Wpointer-arith] if(word[0] == NULL) ^~~~ main.cpp: In member function 'int Trie::getPrefix(Trie*, char*, int)': main.cpp:75:53: warning: NULL used in arithmetic [-Wpointer-arith] if(node->fiu[let] == NULL || word[0] == NULL) ^~~~