MikeMirzayanov's blog

Codeforces Global Rounds
By MikeMirzayanov, 6 years ago, In English

Hello!

It is always satisfying and important for me when former contest participants offer their help to the community and support the development of programming competitions. And now I am in a hurry to share the news that thanks to the support of XTX Markets and the personal participation of Yuri Bedny and Alexander Gerko, we are launching a new line of Codeforces Global Rounds. Hooray!

Like many of you, I had never heard of XTX Markets before but it is one of the largest quantitative-driven electronic liquidity providers in the world. I understand little about the financial sector, but with their 34,148 cores and 42 petabytes of usable storage in their research cluster, XTX’s rapid growth and strong market share globally speak for themselves.

So, in 2019, with the support of XTX Markets, 6 rounds of the new Codeforces Global Rounds will be held. These will be common rounds for both divisions of 7–9 problems each. The duration of the rounds will be 2-3 hours, depending on the number and complexity of the problems. All such rounds will be rated for all participants. At each such round, 50 brand T-shirts will be handed out, and we will be happy to give T-shirts to all authors and problem testers.

I will be very happy for Codeforces to work with the best authors of the problems. I hope that the XTX Markets initiative will allow for interesting and testing rounds that will delight community members! We have the opportunity to pay $800, double fee, for the preparation of a full set of problems (for some rounds we may collect problems from different authors).

The first Global Round will take place very soon — starting Feb/07/2019 16:35 (Moscow time). I hope you will enjoy the round!

— MikeMirzayanov

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Comments Comments (76)
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6 years ago, # |
  Vote: I like it +3 Vote: I do not like it

wonderful MikeMirzayanov !! thanks !

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6 years ago, # |
← Rev. 3   Vote: I like it +8 Vote: I do not like it

Will these rounds be rated?

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6 years ago, # |
  Vote: I like it +157 Vote: I do not like it

What exactly is the difference between regular and global rounds? Just a slightly different format?

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    6 years ago, # ^ |
      Vote: I like it +34 Vote: I do not like it

    I think that's the only difference ;_;

    Godamnit I was expecting rounds for APAC timezones

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    6 years ago, # ^ |
      Vote: I like it +49 Vote: I do not like it

    i think what is difference is the double fee and T-shirts to the authors

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    6 years ago, # ^ |
      Vote: I like it +17 Vote: I do not like it

    No major difference: we hope that extended budget will help to attract well-known writers, focus more on problems, t-shirts give more fun for participants. We are considering the opportunity to make an additional separate ranking for such competitions like Mail.Ru Cup has.

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      6 years ago, # ^ |
        Vote: I like it +6 Vote: I do not like it

      Hey MikeMirzayanov, You mentioned that it will attract setters. Can you please guide us on how one can provide with a full set of problems. I am really interested in hosting a round in CF, I also have 4-5 problems ready but if i can contribute for the global round it would be great!

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6 years ago, # |
  Vote: I like it +38 Vote: I do not like it

Will it affect the frequency of regular codeforces rounds

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Will T-shirt be handedout based on your ranking?

Can 1900+ participat div2?

What if a lot of people sniffing?

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6 years ago, # |
  Vote: I like it +13 Vote: I do not like it

Sounds interesting, but how will the T-Shirts be distributed?

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

In general, are Codeforces Global Rounds Div.1+Div.2 combined with guaranteed T-shirts within each?
(And this means the old term "Div.1+Div.2 combined" would be merged into it, or still separated?)

And last but not least, I guess the scoring rule for CFGRs is still the Codeforces standard rule, right? ;)

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6 years ago, # |
  Vote: I like it +7 Vote: I do not like it

With holding contests, can you also suggest good study materials for different types of algorithms or write some blog about it. I have been coding from last 4 month but couldn't solve more than 2-3 problems in division 2.

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    6 years ago, # ^ |
      Vote: I like it +7 Vote: I do not like it

    Life is hard..bro :(

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    6 years ago, # ^ |
      Vote: I like it +16 Vote: I do not like it

    Participate in contests regularly. Try to up-solve at least 1 problem that you couldn't solve during the contest. If you don't understand the idea behind the problem, learn more about it, practice a few problems related to it and then come back to the original problem. The process is slow but fruitful. Keep practising brother.

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    6 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    that is common.I start to use codeforces in Jan 2018 and at my second contests I fail all the problems (2 problems are hacked in system test).So you can try to learn some knowledge about ICPC and you will learn lots of knowledge you have never learned before.Or you can just use this platform.Just use the function that you can select the problems' difficulty interval.You can try to finish problems which difficulty is below 1600.If you can practise more,you will significantly perform better in contests.

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    6 years ago, # ^ |
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    If you are just at the div2 level, then you actually won't need to worry about huge rating losses because you will just stay on the 1600 level.

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      6 years ago, # ^ |
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      not relevant but great palindrome rating graph :D

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    3 years ago, # ^ |
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    So, how did you ramp up to master? :)

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6 years ago, # |
  Vote: I like it -28 Vote: I do not like it

codeforces is always innovative.

proud to be a part of such a great polygon.

T-shirts prize makes these rounds interesting. I am excited about these rounds.

Thanks MikeMirzayanov.

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6 years ago, # |
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Is the current displayed time for the global round going to be the usual time?

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

tourist will get all t-shirts.

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6 years ago, # |
  Vote: I like it +7 Vote: I do not like it

Contest with new name :) Is their some difference between regular and global rounds?

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6 years ago, # |
  Vote: I like it -15 Vote: I do not like it

I hope drain would be adjusted. :P

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6 years ago, # |
  Vote: I like it -9 Vote: I do not like it

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6 years ago, # |
  Vote: I like it +190 Vote: I do not like it

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

I have a humble proposal — Let us try to make every line of CF contests distinctive in some way.

I am not sure exactly how to give each contest line it's own flavour, but perhaps we can try something like making all questions of a certain contest line of a similar type (For example, DP).

It's really great we are seeing another contest line and that this community hustles with so many contests !

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Will be there even a div 3 contest?

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Yet another Codeforces Round #TBA ( Div1 + Div2 + Div3 ), but with T-shirts .

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Will it be a hacking contest？

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6 years ago, # |
  Vote: I like it +55 Vote: I do not like it

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6 years ago, # |
← Rev. 3   Vote: I like it +171 Vote: I do not like it

Codeforces: We've got something for you...

You: *thinking* maybe they've added the Δ column in the results section, so you don't need to switch between two tabs. Or maybe even better! What if they've actually added calculation of rating change while the round is online, so you don't need the extension. Or maybe they've added language auto-detection so you will never accidentally send C++ code as Python or as Java, if you write on two languages. Or maybe they've added option to send solutions while contest is online and you haven't registered (and even if you registered it would be unranked for you). Maybe they've just removed the registration for some rounds. Maybe they've added an option to see your current submissions while they are in progress on any page (at least we have notification about the result of the submission, that's already awesome).

Codeforces: Now if a round consists of many tasks we will call it "Global"

You: *disappointed face*

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

    I thought codeforces was perfect before reading this. How wrong I was :p

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6 years ago, # |
  Vote: I like it +149 Vote: I do not like it

I think cf is missing an onsite competition per year, like atcoder world tour

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6 years ago, # |
  Vote: I like it +12 Vote: I do not like it

Anyone knows how can I sleep for 3 days and wakeup when the contest starts I can't wait XD.

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6 years ago, # |
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So it is a combined contest for both div1 and div2? Actually I don't know the format.I just register this contest and it is just one contest.If it is a combined contest,I hope the gap between problems can be proper so it can make most participants satisfied with the results.

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6 years ago, # |
← Rev. 6   Vote: I like it +8 Vote: I do not like it

Codeforces: announces new round name

Flat earthers: *TRIGGERED*

Edit: Wow I really do suck at jokes...

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6 years ago, # |
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how can I get a T-shirt?

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Better not be like the last contest =)

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6 years ago, # |
← Rev. 2   Vote: I like it +8 Vote: I do not like it

Happy New Year:)

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6 years ago, # |
  Vote: I like it -51 Vote: I do not like it

计入rating吗？

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

What is the difficulty of this contest? Div.1? Div.2 or Div.3? @MikeMirzayanov

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6 years ago, # |
  Vote: I like it -10 Vote: I do not like it

When I read 'global', I thought Codeforces was going to start some contests with a window-based timeframe where you can take a round for 2-3 hours in a bigger, days-long window, like other sites do. That would help users from usually-inactive timezones, and generally increase round participation. Alas, it's another sponsor-branded round...

(To be fair, I'm not sure how much harder maintaining fairness will be.)

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6 years ago, # |
  Vote: I like it -18 Vote: I do not like it

Wow,I 'm not good at programming.So,I just think that it's a difficult competition for me. If I get three problem right,I will celebrate that.

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6 years ago, # |
  Vote: I like it -11 Vote: I do not like it

Really excited for this new format !!!

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

2400

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

I think it is same as div1+div2 rounds. No changes for a participant except prizes of tshirts, which will obviously be taken away by reds. Correct me if there's something i am missing wrt global rounds. ?

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    6 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    On the CFGR #1 round announcement it says:

    • 30 best participants get a t-shirt.
    • 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

    So reds won't be taking all of the shirts :P

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    6 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Do you propose to give t-shirts for blues instead? Or maybe for greens?

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      6 years ago, # ^ |
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      No. I am not proposing a thing! Am just curious if there is anything new in these new rounds!

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        6 years ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        Well, I will describe the new points. So, here we have stable series of div1 + div2 rounds with same rules for getting T-shirts (new and very loyal rules, BTW), general score across all such rounds, which also can lead to prizes and increased (doubled!) fee for problem setters. In my opinion, quite a lot of changes when compared with existing rounds.

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6 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Good luck everyone

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6 years ago, # |
  Vote: I like it +1 Vote: I do not like it

Old wine In new bottle

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19 months ago, # |
  Vote: I like it +14 Vote: I do not like it

When does the 2023 season of GR start, or GRs are already concluded? It's April but we don't have GR25 yet.

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