In problem E, my code will have some problems when n is not a fib number, I noticed that after I locked problem. There is a person in my room who make mistakes with data like this, I submitted a hack data (this data also can hack myself), and it returned unexpected verdict.

I Failed System Test in E, and my hack has been ignored. But this submission was hacked by me, I didn't get 100 score.

Why is it?