Compilare: user.cpp: In function ‘void insertWord(TrieNode*, const char*)’: user.cpp:26:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[0] != NULL) { ^ user.cpp:29:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node->child[c] == nullptr) { ^ user.cpp:30:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] node->child[c] = new TrieNode(1); ^ user.cpp:32:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] node->child[c]->wordCount++; ^ user.cpp:35:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] insertWord(node->child[c], word + 1); ^ user.cpp: In function ‘bool eraseWord(TrieNode*, const char*)’: user.cpp:40:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[0] != NULL) { ^ user.cpp:42:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] eraseWord(node->child[c], word + 1); ^ user.cpp:51:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int wordCnt(TrieNode*, const char*)’: user.cpp:55:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] TrieNode* next = node->child[c]; ^ user.cpp:61:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[1] == NULL) { ^ user.cpp: In function ‘int findPrefix(TrieNode*, const char*)’: user.cpp:76:20: warning: NULL used in arithmetic [-Wpointer-arith] if (word[0] == NULL) { ^ user.cpp:81:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node->child[c] == nullptr) { ^ user.cpp:85:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] return 1 + findPrefix(node->child[c], word + 1); ^