takopi's blog

Div.1 Users Privileges on Codeforces
By takopi, history, 3 months ago, In English

Clearly, there are certain features in Codeforces that seem to have access limits (opened for 2100+) that are not officially disclosed.

However, here is the list of features that only Div.1 people can use from my observation.

  1. Streams — div1 people can advertise their streaming.

  2. Uphack — div1 people can hack solution after system test.

  3. Problem tag — div1 people can edit problem tags and possibly determine problem rating.

  4. Catalog — div1 people can edit catalog.

  5. Vote — div1 people vote weighted more than other.

Feel free to share if there is anything not mentioned here; there are probably a lot more.

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3 months ago, # |
  Vote: I like it +21 Vote: I do not like it

They can see the solutions of other participants in GYMs.

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3 months ago, # |
← Rev. 2   Vote: I like it +5 Vote: I do not like it

A slight adjustment, streams are only accessible to those who reached 2400 at least once, same with editing the catalog if I'm not mistaken.

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3 months ago, # |
  Vote: I like it +16 Vote: I do not like it

They have feature of touching grass after reaching 2100

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3 months ago, # |
  Vote: I like it -15 Vote: I do not like it

Grandmasters can allow other users to do some actions (write comments, blogs, edit gyms) on behalf of themselves

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3 months ago, # |
  Vote: I like it 0 Vote: I do not like it

I'm Div.2 user but I can also edit problem tags (in the few days after a contest) and view others' solutions in gyms.

Div.1 people vote weighted more than me, at the same time, my votes weighted more than Div.3/4 people.

Giving more power to high rated users is really a wise move. It not only prevents the abuse of power, avoids user dissatisfaction, but also promotes academic progress.

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    3 months ago, # ^ |
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    Aren't you both Div.2 and Div.1??

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

      My bad, sorry. Anyway I'm not 2100+, but true I can participant in Div.1.

      (If you didn't tell me today maybe I need months to find out that I can participant in Div.1)

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        3 months ago, # ^ |
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        lol you should definitely participate in the next Div 1

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3 months ago, # |
  Vote: I like it +26 Vote: I do not like it

Everything here is actually officially disclosed. It's just that there is no "one page" that lists all of these privileges. Also, many things here have a higher rating bound than just being in Div. 1.

Some additional things are:

  • "Coach mode" in Gym which includes the ability to:
    • add contests to Gym (also possibly create mashups?)
    • read the solutions of others in Gym
    • edit contests in Gym (this is quite limited, but it's possible to change things like time limits of recent contests)
  • Creating groups
  • Proposing contests
  • "Trusting" other users, which gives them the ability to
    • write blog posts (unrated users can't do that)
    • create mashups
    • create private groups
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    3 months ago, # ^ |
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    Where is it disclosed?

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      3 months ago, # ^ |
      ← Rev. 2   Vote: I like it 0 Vote: I do not like it

      Streams: https://codeforces.me/blog/entry/83939

      The opportunity to add streams to Codeforces is open to red participants and by individual invitations for now. We possibly open this opportunity to more users later.

      Uphacking: https://codeforces.me/blog/entry/68204

      Now, after the end of almost any contest, participants from Div.1 have the opportunity to hack any solution in this contest during the week.

      Catalog: https://codeforces.me/blog/entry/98551

      Any red user can enable directory editing.

      Voting: https://codeforces.me/blog/entry/3649

      Also, as Codeforces is a professional community of those who is interested in sports programming, it was decided to consider the participants' professional achievements. Thus, the value of a participant's vote now is delapnds on the participant's authority and the authority is determined by the rating.

      etc etc. All official announcements.

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

actually, i dont have the ability to determine problem rating

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3 months ago, # |
  Vote: I like it +8 Vote: I do not like it

I have no access to problem tags.

I can't uphack solutions in all contests I just randomly chose. Actually sometime in the past I could so it might be determined by something else.

The biggest problem is actually Coach Mode in gym. Luckily if a gym contest is kindof "private", then I have no access to it.

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    3 months ago, # ^ |
      Vote: I like it -8 Vote: I do not like it

    You can only edit problem tags for a while after the official contest has ended. How long that period is I have no idea.

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    3 months ago, # ^ |
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    I think, a threshold amount of contribution is needed for tag access. that shows the trust of other participants.

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