conqueror_of_timosh's blog

Same Code, Different Verdict?
By conqueror_of_timosh, history, 17 months ago, translation, In English

Hi everyone!

After a contest Codeforces Round 1028 (Div. 2), i came up with an issue.

A solution that passed system testing during the contest was resubmitted after the round with no changes at all, and guess what it got WA24 322350733!

This made me wonder:

  • were the testcases added after the contest?
  • if so, shouldn't all accepted submissions be retested to keep things fair?

It's a bit confusing to see two different verdicts for the same code. If this kind of thing is possible, maybe it would be good to clarify how it's handled officially.

Has anyone seen this happen before?

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17 months ago, hide # |
 
Vote: I like it +5 Vote: I do not like it

were the testcases added after the contest?

Yes. If you open the submissions accepted during the contest and see the tests, there were only 15 tests in total, so the tests >= 16 are added after system test. They are added by uphacks.

if so, shouldn't all accepted submissions be retested to keep things fair?

No, as stated in the link above.

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