Compilare: user.cpp: In function ‘void query(Trie*, char*)’: user.cpp:63:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node->son[node->best]) node = node->son[node->best]; ^ user.cpp:63:58: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node->son[node->best]) node = node->son[node->best]; ^ user.cpp:64:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if (node->best < 0 || !node->son[node->best]) break; ^ user.cpp: In function ‘int main()’: user.cpp:99:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:105:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &N, &M); ^ user.cpp:109:19: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] insert(T, line); ^ user.cpp:112:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, 50, stdin); ^