prof.PVH's blog

By prof.PVH, 5 years ago, In English,

Congratulations! worse has become the first person on Codeforces with negative rating!!!

I wonder, how many CF rounds does tourist need to have rating lower than worse :D

 
 
 
 
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5 years ago, # |
  Vote: I like it +91 Vote: I do not like it

I wonder, how many rounds does worse need to have rating higher than tourist :)

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    5 years ago, # ^ |
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    I think he needs infinite rounds :P

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      5 years ago, # ^ |
        Vote: I like it +48 Vote: I do not like it

      Or just int owerflow.

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

      less than infinite rounds , if he continue like this he will be higher than tourist (in absolute value of course :P )

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        5 years ago, # ^ |
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        It will be harder as he got more negative rating. When his rating is something like -1000, I think getting last place may only get him -0

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

        less than infinite rounds, if he continue like this he will be higher than tourist because of an integer underflow and get 21474836xx rating XD

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          5 years ago, # ^ |
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          that depends on whether the variable used to store users' rating is int or long long. :D

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    5 years ago, # ^ |
      Vote: I like it +43 Vote: I do not like it

    I wonder if worse got 1st rank in the next contest how many points he will get?

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      5 years ago, # ^ |
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      you are kingofnumbers, So tell everyone how many points.:D, :P.

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        5 years ago, # ^ |
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        I need the formulas before I can calculate how many points.

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      5 years ago, # ^ |
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      What did you say? You think he is stupid enough to lose years of hard work.

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        5 years ago, # ^ |
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        just wondering!

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        5 years ago, # ^ |
          Vote: I like it +32 Vote: I do not like it

        Plot twist: a talented coder with his next level of challenge: drop to negative rating and skyrocket to the top :P

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          5 years ago, # ^ |
            Vote: I like it -12 Vote: I do not like it

          I think continue to do this is more challenge drop to negative, and then get to top ,then drop to negative again ,then get to top

          rating=0; for(;;) { while(rating<4000) rating++; while(rating>-4000) rating--; }

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    5 years ago, # ^ |
    Rev. 2   Vote: I like it +24 Vote: I do not like it

    I wonder, how many rounds will tourist need to surpass his own rating (tourist) if he is given worse's profile along with his rating. :P

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5 years ago, # |
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Really wondering what color and title he's gonna get :)

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5 years ago, # |
  Vote: I like it -26 Vote: I do not like it

I found that worse still can solve some easier problems, but he/she submitted too many unsuccessful hacking attempts results in negative scores in most contest.

Maybe he/she can think twice before every hacking. Hope he/she have a positive rating again :)

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    5 years ago, # ^ |
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    He can solve even D, and then make a lot of unsuccessful hacks.

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    5 years ago, # ^ |
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    in fact, i think he solves problems specifically for making unsuccessful hacks (because u need to have Pretests passed on a problem to lock and attempt to hack others).

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5 years ago, # |
  Vote: I like it +179 Vote: I do not like it

When div1 users register at div2 contest a red message appear saying:

You are registering out-of-comptition reason: rating shoud be between 0 and 1699

so if the rating should be between 0 and 1699 to participate officially at div2 round does that mean that worse will not be able to participate officially at div2 contests? will his rating stay forever -37 ? or there will be a div3 contest for him?

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5 years ago, # |
Rev. 2   Vote: I like it -7 Vote: I do not like it

OMG, his handle may be worse, but this negative rating is ridiculous!!
EDIT: i remember that once despite the fact that tourist won a contest, his rating decreased. this resulted in the change of rating system. surely something like negative rating is another reason to change it again?

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    5 years ago, # ^ |
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    I don't think negative rating is ridiculous. But they (admins) probably have to do smth with this div2-segment (0 — 1699 rating). At least they can say, that there is no lower bound or smth like this.

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      5 years ago, # ^ |
        Vote: I like it -29 Vote: I do not like it

      Negative rating is not so ridiculous, but worse getting an even worse rating than the one at the start of the competition is ridiculous.

      I say so because the rating system is based on the Elo system, which is supposed to decrease your rating if you performed worse than expected or increase it if you performed better than expect it. Since worse has the lowest rating on all codeforces, his finishing last in a competition should not cause him to lose any points (or not such a large number surely).

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        5 years ago, # ^ |
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        so, u mean to say that — if tourist wins the next contest, his rating should not increase because his expected position is 1st?
        i don't agree — if u finish first, ur rating should increase no matter what; and if u finish last, ur rating should decrease no matter what.

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          5 years ago, # ^ |
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          For tourist expected position is not 1.0. If we'll take into account only Petr and rng_58 — in last div1 contest they already decreased his expected position to ~1.14. Therefore finishing first always means that your real place is better than your expected place, and rating of winner will always increase, if we use clean Elo-based formulas.

          And when tourist lost rating after winning a contest — it was because of strange rating formulas:) I understood the problem in the following way — he got +x for winning a contest and -y after multiplying his rating by some magic constant to prevent rating inflation. And it turned out that x<y:)

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            5 years ago, # ^ |
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            finishing first always means that your real place is better than your expected place
            this is exactly what i meant (but in the opposite end of the standings) — finishing last always means that your real place is worse than your expected place.

            that's why worse's rating decreased despite his rating before contest already being very small.

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          5 years ago, # ^ |
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          I mean to say it should increase by a very small amount. Look here for an Elo calculator: http://bzstats.strayer.de/bzinfo/elo/?lang=en

          In this, if you enter 716 (4th lowest rated coder who participated) and 13 (worse's rating) and calculate the new Elo ratings if worse loses, you get 13. The same rating. It doesn't change (it probably would change by a fraction). Also, you can see his rating has fallen by more or less the same amount the past few contests. That doesn't seem to make sense. A person rated X coming last should lose a different amount of points than a person rated Y coming last.

          http://codeforces.com/contestRegistrants/466/page/17?order=BY_RATING_DESC

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            5 years ago, # ^ |
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            Original Elo rating has been developed into smth that fix into multi participant environment, rather than the first version that only supports two person game. (Here the rating system is not exactly the same as in Chess or StarCraft)

            And in one-on-one battles, it is impossible to get two participants with such a big difference compete in one game. But in multi participant, hundreds of people and possibly in a large rating interval are put together. There must be some changes.

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        5 years ago, # ^ |
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        Newly registered contestants are considered to have median place expectation at their first contest. It does not mean they really are considered to have zero rating.

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    5 years ago, # ^ |
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    Negative rating is appropriate because if the ratings had been stored in unsigned integers instead , worse would have a higher rating than tourist :P

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5 years ago, # |
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why worse doing that?

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    5 years ago, # ^ |
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    Just out of fun surely :)

    Why are you surprised? Most people like jokes!

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5 years ago, # |
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I think what he/she really wanted was to test if it was possible to have negative rating here in CodeForces. His/her rating function is strictly decreasing!! is so bad that it can't be true, I'm nor sure about this but I think that he has been the last in every round that has participated!!!

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    5 years ago, # ^ |
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    Not true. He has himself said he was last or second last.

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    5 years ago, # ^ |
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    I wonder who is the real person behind the handle worse. Maybe he holds two accounts, one (possibly in div.1) is for real competing, and this is only for a test or just for fun.

    worse even knows Segment tree and Strongly connected components and other algorithms and data structures! That is much better than even many Blue coders!

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5 years ago, # |
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btw I was quite shocked to see that I gave worse a tough competition in last round :P

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5 years ago, # |
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Don't you all see it? His aim was to become popular, and he completely succeeded :P

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5 years ago, # |
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I think worse wants to show us how become division 1 coder from 0. I think worse is not worse at all. He has more C solutions than a lot of green and blue coders.

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5 years ago, # |
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I wonder why the rating is still 13 on the rating page......

UPD: Maybe it's a bug and has been fixed now.

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5 years ago, # |
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OMG,worse has been really worse than anyone:P.Even his profile pic depicts that :P

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5 years ago, # |
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how could rating be negtive,OMG!! is the lower_bound of rating -inf?

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    5 years ago, # ^ |
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    since upper bound of rating is  + ∞, i don't see why its lower bound shouldn't be  - ∞. :)