Compilare: user.cpp: In constructor ‘TrieNode::TrieNode(int)’: user.cpp:18:42: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(child, NULL, sizeof(child)); ^ user.cpp: In function ‘void insertWord(TrieNode*, char*)’: user.cpp:23:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[0] != NULL) { ^ user.cpp: In function ‘bool eraseWord(TrieNode*, char*)’: user.cpp:36:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[0] != NULL) { ^ user.cpp:46:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int wordCnt(TrieNode*, char*)’: user.cpp:53:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[1] == NULL) { ^ user.cpp: In function ‘int findPrefix(TrieNode*, const char*)’: user.cpp:68:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[0] == NULL || nextNode == NULL) { ^