Compilare: user.c: In function ‘main’: user.c:6:10: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int n, *a, s, i, r, aux, r1; ^ user.c:10:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.c:11:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &s); ^