1.
What did the question marks ("?") mean in the contest standings page?
And they disappeared when the contest finished.

2.
In the judge status page, do the memory and time fields show the longest and biggest values in all finished tests or the values of the last test?

Thanks
Ade

1. "?" means that there were no accepted submissions for this problem in first 4 hours and there were some submissions in the last hour. So results are effectively frozen at 4:00 mark.

2. Longest and biggest.

Thank you for your clear answers.

One further question: What's the purpose of the freezing?

Thanks
Ade

It was made for "keeping the intrigue". You may argue whether it should or shouldn't be done in internet contests, but in real contests with prizes it definitely makes sense.

Thank you very much.

What I do is just following the others' steps. I always try to solve the next easiest (solved most times) problem.
So I guess it only matters much for the top guys.

Ade