Compilare: user.cpp: In constructor ‘Trie::Trie(int)’: user.cpp:15:40: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(next, NULL, sizeof(next)); ^ user.cpp: In function ‘void addWord(char*, pTrie)’: user.cpp:24:19: warning: NULL used in arithmetic [-Wpointer-arith] if(word[0] != NULL) { ^ user.cpp: In function ‘void removeWord(char*, pTrie)’: user.cpp:35:19: warning: NULL used in arithmetic [-Wpointer-arith] if(word[0] != NULL) { ^ user.cpp: In function ‘int findPref(char*, pTrie)’: user.cpp:48:19: warning: NULL used in arithmetic [-Wpointer-arith] if(word[0] == NULL) return 0; ^ user.cpp: In function ‘int nrap(char*, pTrie)’: user.cpp:54:19: warning: NULL used in arithmetic [-Wpointer-arith] if(word[1] == NULL) { ^