Compilare: user.cpp: In function ‘void Update(Node*, int)’: user.cpp:48:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node -> son[now[pos]] == NULL) ^ user.cpp:49:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] node -> son[now[pos]] = newEmptyNode(); ^ user.cpp:52:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] Update(node -> son[now[pos]], pos + 1); ^ user.cpp: In function ‘int main()’: user.cpp:95:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d\n", &N, &K, &W, &D); ^ user.cpp:100:22: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(now); ^ /tmp/ccen4yU0.o: In function `main': user.cpp:(.text.startup+0x88): warning: the `gets' function is dangerous and should not be used.