As you can see from the last submissions for the Challenge problem of MAY’14 long contest (ANUMFS), both me and @aawisong submitted solutions which scored an absolute score of 0 (yes, that means we got the answer exactly right for each test case without the need of asking any question), which is the minimum possible.
However, it seems that the system cannot handle such scores and it ended up assigning a score of 0 to everyone. Of course, the correct ranking would assign full score to me and @aawisong and a relative score of 0 for everyone else.
The issue is that the problem allowed the possibility to obtain 0 score per test case. My suggestion would be to fix this problem in one of two ways:
fix the scoring algorithm in the judge so that the minimum score per test case is > 0 (e.g. add 1 to the absolute score of every test case, or something smaller than 1, if you want, like 0.00001) - should be very easy to do and wouldn’t change the relative order of the scores (it would simply add a fixed value to the score of each contestant)
fix the general scoring problem in the system, so that scores of 0 for minimization problems are handled correctly - this is probably more difficult to fix