csacademy's blog

Round #26 (Div. 2) + Special Prizes
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. Round #26 will take place on Tuesday, April/25/2017 15:00 (UTC). This round will be a Div. 2, meaning that the rating change will only affect users with a rating below 1600. Unrated users will also be affected. High rated coders can participate unofficially.

If you want to take part in this round you need to register before the contest begins. As this is a Div. 2, it will consist of 5 tasks of more accessible difficulty.

Special prizes

This round will have 3 special prizes consisting of private coaching lessons with our contest coordinator, wefgef. Each lesson will be conducted on Skype and will last for 1 hour and 30 minutes. The topics approached during the lesson will be the choice of the winners. The prizes will be distributed as follows:

  • 1 random prize for the top 20%
  • 1 random prize for the next 30%
  • 1 random prize for the bottom 50%

Contest format:

  • You will have to solve 5 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.

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

Later Edit:

Congratulations to the winners:

  1. Irineu
  2. Sisu
  3. mnaeraxr
  4. Twoflower
  5. Slamur

Also the Div. 1 winners:

  1. Deemo
  2. Bedge
  3. kmjp
  4. satyaki3794
  5. IMAN_GH

And the 3 lucky prize winners:

  1. Sisu
  2. FelixMP
  3. elistark

Also, the editorial has been published. Hope you enjoyed the contest!

  • Vote: I like it
  • +85
  • Vote: I do not like it

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

Same time this round also... Please consider rotating time slot from next contest

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

    Next Div. 2 will be in a different time slot to make it easier for people in Asia to participate.

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

      Why the timing has been from 12 to 15 utc initially it was 12?

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

        Some members of our team just came back from the Romanian National Olympiad in Informatics, so we had to move the contest a few hours later.

        When the contest was initially announced on the site we weren't aware of the olympiad's schedule.

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

Just a reminder, the round starts in 4 hours.

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8 years ago, # |
← Rev. 3   Vote: I like it +4 Vote: I do not like it

Hi, Can someone please explain editorial for problem E(Critical Cells), I think which is similar to this problem. I am not quite clear with given analysis of it.

Update -> Got it.

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