csacademy's blog

Round #11 Contest with prizes
By csacademy, history, 8 years ago, In English

Hello, Codeforces!

We are happy to announce that we're going to host a new contest at csacademy.com. Round #11 will take place today, Monday, 22/Aug/2016 16:30 (UTC). If you want to take part in this round you need to register before the contest begins. Just like the previous rounds, this will be a Div1 + Div2, with 7 tasks of varied difficulty. We are honoured to have Alex7 as a problem setter.

This round is going to have some money prizes, as follows:

  • First place: 125$
  • Second place: 100$
  • Third place: 75$
  • Fourth and fifth place: 50$
  • Two more special prizes, each consisting of 50$. The criteria for the special prizes is not chosen yet, but we will make it public after the contest.

Contest format:

  • You will have to solve 7 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.

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

Thanks! Have you moved the contest time later because of coincidence with CF round ?

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

    Yes, we did move it half an hour later than our planned time because of the educational round.

    We did have it scheduled publicly for a week before the CF round, and it didn't overlap any other contests then, so I hope in the future competitive programming times are better self-organized by the community.

    If we all follow a common protocol, by using clist.by for instance, things would be better for users. :)

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

How can see the tags or the difficulty levels of the problems on csacademy?

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

    You can't yet, but it will soon be implemented.

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

Site is down or there are problems on my side?

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

    It is OK now

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

      No, it's not. Great to wait for a verdict for about 20 minutes.

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        8 years ago, # ^ |
          Vote: I like it +28 Vote: I do not like it

        Sorry, unfortunately the only time we get to properly load test some parts of our platform are during contests. There was an undiscovered bug with network communication with our evaluation machines that we couldn't reproduce otherwise, they were actually able to process the load fine. That bug was fixed and shouldn't come up in future competitions.

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        8 years ago, # ^ |
          Vote: I like it +53 Vote: I do not like it

        The round will be unrated :(

        We decided to take a one month break in order to solve all the bugs and make sure the platform is stable. Sorry for all the troubles.

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          8 years ago, # ^ |
            Vote: I like it +19 Vote: I do not like it

          System bugs were annoying , but i really enjoyed the problems. I hope you keep on your contests soon ...

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8 years ago, # |
  Vote: I like it +20 Vote: I do not like it

I'm curious about this now: what happens with the prizes?

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    8 years ago, # ^ |
    ← Rev. 2   Vote: I like it +11 Vote: I do not like it

    Prizes will be awarded to the top participants, with the current scoring. This is our reasoning:

    The bug for the first half hour was the same for everyone, and didn't stop anyone from reading and implementing their solutions in that time (just the evaluation was broken).

    Our penalty calculation only depends on the time of your last AC, and since none of the top 5 could have solved all the tasks during the bug, their performance wasn't really that affected from what they could have done during full functionality.

    The round is unrated for the people that rage quit when things were broken, and shouldn't suffer because of that.

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