Well, I have been out for this Beauty of Programming. Anyway, I still gain a lots things.
Firstly, I find it's not difficult to pass the second competition, what I can do is solve the easy question as soon as possible. Besides, I can resigter one more account so that I can submit a lots times.
Secondly, I really find that importance of the model. So, next step, I will care more about the build various model so that I can save more time.
Just keep doing!