kfqg's blog

Problem Difficulty Algorithm Seems Broken
By kfqg, history, 5 years ago, In English

For CodeForces round #537 (Div. 2) the problem difficulty algorithm seems incorrect.

Problem B — 694 / 4752 correct submissions during contest, rated 1600

Problem C — 1272 / 2172 correct submissions during contest, rated 1700

Can anyone explain how this could happen? I don't see how any algorithm could rank the C as harder.

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5 years ago, # |
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There's something called weak pretests.

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    5 years ago, # ^ |
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    I think that's what he is asking, what is the algorithm

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