Compilare: user.c: In function ‘sort’: user.c:25:10: warning: unused variable ‘dis’ [-Wunused-variable] dis, ^ user.c:24:10: warning: unused variable ‘d’ [-Wunused-variable] int d, ^ user.c: In function ‘read’: user.c:13:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.c:15:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:17:34: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] for(i = 0; i < n; i++) scanf("%d", &vec[ i ]); ^ user.c: In function ‘write’: user.c:63:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^