Compilare: user.c: In function ‘erase_val’: user.c:45:31: warning: unused variable ‘next’ [-Wunused-variable] struct hash_line *next = it->next->next; ^ user.c: In function ‘main’: user.c:57:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out", "w", stdout); ^ user.c:59:15: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", &N); N; --N){ ^ user.c:60:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &type, &key); ^