havaliza's blog

Wrong test data in problem 220B
By havaliza, 12 years ago, In English

Today, I wrote the code for two different approaches of 220B - Little Elephant and Array (one O(nlgn) and one ) and both of them got verdict Wrong answer on test 33. Here are the submissions:

2097772

2096670

Also my friend LGM submitted his previously accepted code and also got Wrong answer on test 33.

2086826

2097755

Could admins please check if there is something wrong?

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12 years ago, # |
  Vote: I like it +3 Vote: I do not like it

I'm tried to submit my accepted solution from contest — it also got WA 33 now.

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    12 years ago, # ^ |
    ← Rev. 3   Vote: I like it +10 Vote: I do not like it

    a few minutes before, my AC solution from contest got AC. There are several testing machines, and one of them can contain damaged test data, try to submit several times, changing code (to change it's hash value)

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12 years ago, # |
← Rev. 2   Vote: I like it +8 Vote: I do not like it

I have the same problem...In upsolving my AC (slow) solution gets WA 33 (just like another one, which is faster). Admins, please, fix it!

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    12 years ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    Somebody wrote about this problem to administration?

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12 years ago, # |
  Vote: I like it +8 Vote: I do not like it

Thank you for the alert. It happends because of randomization of the generator by time like srand(time(NULL)). The generator is from hacks. Actually we are checking them to be stable, but it seems it passed the test. Sorry for inconvenience. I've replaced randomization with fixed srand value and rejudged practice and virtual solutions. It seems issue didn't affect official contestants.

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    12 years ago, # ^ |
      Vote: I like it +9 Vote: I do not like it

    Was the test valid? If it was valid and accepted solutions got WA, maybe this test should be remained?

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12 years ago, # |
← Rev. 2   Vote: I like it 0 Vote: I do not like it

Thx for fixing it... It did ruin my contest, though it was a virtual one >_<

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