csacademy's blog

Round #21
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 #21 will take place on Sunday, 19/Mar/2017 15:00 (UTC). If you want to take part in this round you need to register before the contest begins. This contest will be a Div1 + Div2, with 7 tasks of varying difficulty that need to be solved in 2 hours.

We are honoured to have desert97 as problem setter.

More contests, never miss them again

The platform has reached a certain level of maturity that allows us to organise more contests from now on. We have created an event on Facebook. You only need to join once, and you will be notified every time we host a new round.

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.

Edit

Due to some unexpected events, we had to move the start of the contest one hour later.

Later edit

Congratulations to the winners:

  1. I_love_Tanya_Romanova
  2. izban
  3. LHiC
  4. lucyanna2018
  5. W4yneb0t

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

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

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

It is written that it will begin at 12:00 UTC but clocks show 14:00 UTC. Which time is correct?

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8 years ago, # |
  Vote: I like it +23 Vote: I do not like it

Are you aware that the new contest time conflicts with Codechef Cook Off?

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

    Well I am glad I saw that they changed the time, otherwise this would be second time I wake up hour too early after contest is moved back an hour. But yeah indeed it does conflict with the Codechef Cook Off which is unfortunate :(

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

    I checked on clist, but I didn't see any conflict. Cook Offs are not parsed by clist, apparently :(

    We're really sorry for this clash, hope to see you guys on CS Academy at least for the first hour.

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

Standard problem on cactus? Seriously?

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

    Not all can be great :(. My personal favourite was Catch the Thief.

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    8 years ago, # ^ |
      Vote: I like it +25 Vote: I do not like it

    Let me recall great formula for creating glorious problems: http://codeforces.me/blog/entry/10161?#comment-156236

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      8 years ago, # ^ |
      ← Rev. 3   Vote: I like it +16 Vote: I do not like it

      =))) So funny

      Sorry guys, didn't know cactus is so hated, even though alex.velea tried to warn me. I've never authored such a problem before, and I was too stubborn for no reason. I'm just sad some of you probably didn't have time to approach the last 2 problems because of this.

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

Could someone please elaborate the DP part in Special MVC ?

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