Harsh_kunwar's blog

Incorrect change in rating in Codeforces Round 934 (Div. 2)
By Harsh_kunwar, history, 6 weeks ago, In English

Hello MikeMirzayanov,

In Codeforces Round 934 (Div. 2), as per the common standings my rank is 1192. However in the contests page my rank is 4811, as a result of which I got a rating change of negative 106. Please address my problem. standings

Proofs are attached below

  • Vote: I like it
  • +105
  • Vote: I do not like it

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6 weeks ago, # |
  Vote: I like it +10 Vote: I do not like it

agree, it's kind weird, you and https://codeforces.com/profile/VikkyM share same rank with 100% different points

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6 weeks ago, # |
← Rev. 4   Vote: I like it -11 Vote: I do not like it

Agreed. I hope it gets corrected

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5 weeks ago, # |
  Vote: I like it -7 Vote: I do not like it

They have given incorrect rating for recent div3 as well.

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5 weeks ago, # |
  Vote: I like it -7 Vote: I do not like it

I solved 4 questions of div 3, and they gave only +31 to me

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    5 weeks ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    What's wrong then?

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      5 weeks ago, # ^ |
        Vote: I like it -18 Vote: I do not like it

      I guess solving 4 questions in div3 , atleast usually they give +100 or more right?

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        5 weeks ago, # ^ |
          Vote: I like it +17 Vote: I do not like it

        Does not work that way. Check This

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        5 weeks ago, # ^ |
        ← Rev. 2   Vote: I like it +9 Vote: I do not like it

        It depends on the contest, how fast you solved the problems, and your initial rating. The formula (usually pretty close to accurate for small rating changes) is $$$\Delta = \frac{P - R}{4},$$$ where $$$P$$$ is your performance, and $$$R$$$ is your current rating.

        EDIT: Sniped :(

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          5 weeks ago, # ^ |
            Vote: I like it +9 Vote: I do not like it

          Note that this is only an approximate formula, and gets less accurate for higher rating changes (usually the rating change is more than what this formula indicates).

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5 weeks ago, # |
  Vote: I like it +14 Vote: I do not like it

One of your submissions wasn't tested on full testset by the moment of rating calculation. Will be correct after today recalculation.

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