csacademy's blog

Beta Round #4 — csacademy.com
By csacademy, 8 years ago, In English

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Once again we'd like to thank all our users for the great feedback they provide. We try to listen to your advice and improve our platform with each competition.

Our Beta Round #4 will take place on Tuesday, Apr/26/2016 16:00 (UTC). If you want to take part in this round you need to register before the contest begins. You can access the chat room for this round here (login required). Initially we were planning on having two divisions starting with this round. After taking a closer look at the rankings we decided it's too early to separate our users. So this round will be a Div1 + Div2, with 3 easy tasks and 3 more challenging ones.

Platform changes since Beta Round #3:

  • We have integrated our rating system and retroactively applied it to the previous three rounds. You can access the rankings here. For each round we considered only those users who submitted at least one solution. If you registered but didn't submit anything your rating should've been unaffected.
  • We have created profile pages. Important: You need to have a username set in order to access your profile page. If you want to use your Codeforces handle you need to link your account in the account settings page.
  • For those of you who linked your CF account we used our charts library to plot the CF rating. If you didn't link your account you can check out what it looks like here, under the "External profiles" tab. The charts support zoom and drag behaviours.
  • We have added global chat rooms for the contests. The chat room will be available only before and after the round takes place. During the contest we will deactivate it.

Contest format:

  • You will have to solve 6 tasks in 2 hours.
  • There will be full feedback throughout the entire contest.
  • Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
  • Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
  • Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

  • Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
  • Solutions that don't compile or don't pass the example test cases are ignored.
  • Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

We still recommend using an updated version of Google Chrome. If you find any bugs please email us at [email protected]

Don't forget to like us on Facebook, VK and follow us on Twitter.

EDIT: The editorial is ready. Congratulations to all the users and we hope you had a great time. We are waiting for you at Beta Round #5.

LATER EDIT: We fixed the bug and updated the ratings

  • Vote: I like it
  • +124
  • Vote: I do not like it

Comments Comments (28)
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8 years ago, # |
  Vote: I like it +6 Vote: I do not like it

Great :D

looking forward to participate in Beta Round #4 ^_^

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

Looking forward to participate in this round. Hope this round will be at least as good as the previous ones. :D

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

do people with names starting with underscore or dot have to use another username on CSA even after linking their profiles to CF?

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    8 years ago, # ^ |
    ← Rev. 2   Vote: I like it +1 Vote: I do not like it

    Short answer: unfortunately no.

    There's a technical reason for not allowing underscores and dots as prefixes of usernames. For example when we were using the Codeforces API to crawl the user history we encountered multiple problems due to these usernames. Our scripts were failing and we had to restart them manually.

    We're sorry for all of you who wanted to link the CF accounts, but consistency principles force us to not allow it :(.

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8 years ago, # |
← Rev. 5   Vote: I like it +11 Vote: I do not like it

Hi, I am running Linux and have tried accessing your site with Firefox and Chromium. I have been able to log in and view the pages, but whenever I try to enter a contest (say, "Arhiva") this a is all I see. This is in general true for all pages I view on your site except the home page.

Do you have any ideas why it isn't working? I have been looking forward to writing contests on your platform.

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

    What version of Chromium do you use? You can find out by typing "chrome://version/" or "about:version" in the address bar. Ideally, you should have version 48 or later, so please try to update if you have an older version. Unfortunately, we cannot support older versions of Chrome right now because it would be too technically demanding to so in this early stage of development. If you still encounter problems despite using the latest version of Chromium, please write back to me, so I can try to help.

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

I am not able to sign up using my email address.

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

    What kind of error are you having? Can you give me your Email address in private? Registration seems to be fine with us.

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

Will there be a hacking phase like on topcoder?

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

Is it possible to submit from file? I searched for this button and accidentally submitted empty code in A(and got WA, lol).

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

    No, there isn't an upload fie button yet :(.

    Did that submission count? If a solution doesn't pass the examples it shouldn't be taken in consideration.

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

      Yes, it counted, as well as one of my submissions for E, which also didn't pass the examples.

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

        It's a bug. If you are right we will fix it.

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8 years ago, # |
  Vote: I like it +31 Vote: I do not like it

Amazing contest, very nice problems and cool platform! Here are two suggestions:

1. Make a feature for following people (like cf friends).
2. Make a feature to hide my current position, because some may find it hard to concentrate on coding while their position is always changing.

Thank you for the great contest!

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

    Our plan is to allow you to have friends, just like Facebook, but this feature is gonna take a while. You just need to be patient.

    More options will be added at each round. Thank you for the feedback!

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

Cost me 2 WAs for getline(cin,s) :'( AC using cin. Really nice problemset,enjoyed the contest :) :D :D. Will be waiting for the Round 5 :).

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

I discovered that it would be awesome if there was a chat on CF before rounds. I guess it would be impossible due to the very high amount of participants?

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

    Yes,that chat feature :D Really amazing concept,like TC.

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

Awesome problemset! Will you guys be releasing the editorial?

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    8 years ago, # ^ |
    ← Rev. 2   Vote: I like it +1 Vote: I do not like it

    We posted the editorial right after the contest ended. You can find it here.

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

How to solve Problem C ... P.S : Problem B was Nice .

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

Very nice problems. Online XorMax is one of my all time favorites. I really liked the concept, the thinking process involved and the solution.

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

Editorial link not working! :(

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