csacademy's blog

Round #16 (Interactive only)
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 #16 will take place on Sunday, 11/Dec/2016 12:00 (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 varied difficulty that need to be solved in 2 hours. ALL 7 problems will be interactive. Check out our blog post for more details about interactive problems.

Many thanks to Yury_Bandarchuk for translating the problem statements in Russian.

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.

Platform changes since Round #15

  • Added interactive problems
  • Added analysis section for contests

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.

  • Vote: I like it
  • +132
  • Vote: I do not like it

»
8 years ago, # |
  Vote: I like it +58 Vote: I do not like it

I really can't believe that I'm asking this... is it rated?

Just wondering because this is a new type of problem which might mean it is unrated. I couldn't find anything on this post nor the post on csacademy.com. Thanks!

→ Reply
  • »
    »
    8 years ago, # ^ |
      Vote: I like it +62 Vote: I do not like it

    Yes, the round is rated for all participants.

    → Reply
    • »
      »
      »
      8 years ago, # ^ |
        Vote: I like it +87 Vote: I do not like it

      Let's see if this will remain true after the contest ends ;)

      → Reply
»
8 years ago, # |
  Vote: I like it +19 Vote: I do not like it

Just a reminder, the round starts in less than 3 hours.

→ Reply
»
8 years ago, # |
  Vote: I like it +9 Vote: I do not like it

The third task https://csacademy.com/contest/round-16/#task/marble-weights/ is same as this http://codeforces.net/problemset/problem/727/C !!!

→ Reply
  • »
    »
    8 years ago, # ^ |
    ← Rev. 2   Vote: I like it +9 Vote: I do not like it

    Sorry about this, I didn't know the problem was already on CF.

    Technically speaking, our problem was a bit easier, as you could choose a subset of any size >= 2 (the CF version enforces subsets of size = 2).

    → Reply
»
8 years ago, # |
  Vote: I like it +28 Vote: I do not like it

Rating system doesn't seem to be very fair. LHiC won that contest and got +6 points :d. And current leader of overall standings got +19 in his last contest for placing at 12th place.

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

    Furthermore, my friend who got 0 in the contest (and was 1500, i.e. unrated before) got +9 rating or something like that. Also, I got rank 15 and my friend got rank 80+ but our rating is quite close. (156x vs 1600) The rating system needs a rework IMO.

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

    Yes, you are right. We'll investigate tomorrow and probably recalculate the ratings.

    → Reply