Compilare: user.c: In function ‘main’: user.c:23:10: warning: unused variable ‘ok’ [-Wunused-variable] char ok=1; ^ user.c:18:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana.in","r",stdin); ^ user.c:19:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana.out","w",stdout); ^ user.c:25:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&t); ^ user.c:27:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lli%i",&n,&k); ^