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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.
There's something called weak pretests.
I think that's what he is asking, what is the algorithm