Compilare: user.c: In function ‘main’: user.c:29:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (ap[j]) ^ user.c:15:16: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for (fscanf(f, "%d", &t); t; t--){ ^ user.c:19:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.c:21:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^