Konijntje's blog

solved.ac Grand Arena #1 Announcement
By Konijntje, history, 15 months ago, In English

Hi, I am Konijntje, staff of the Korean programming site -- solved.ac.

We will hold solved.ac Grand Arena Round 1.

  • Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20230806T14&p1=235&ah=3, 180 minutes
  • Problems: 9, in ICPC format
  • Difficulty: Problems A and B are the first and second easiest problems expected by the jury. The order will be random except for problems A and B. All problems' difficulty will be between Bronze and Diamond by the solved.ac scale.
  • Penalty: 20 minutes; The scoreboard will freeze 30 minutes before the contest ends. Compilation errors do not count toward penalties.
  • Scoreboard: ICPC style. The contestant with more solves is ranked in a higher place. If two contestants have the same number of solves, the contestant with the small amount of the sum of penalties over all accepted problems is ranked in a higher place.
  • Time and memory: There is a handicap for some languages.
  • Rated range: Unrated — SS+.

This contest is a solved.ac Arena contest. The following terms apply to an Arena contest.

  • Your performance in the Arena will change your arena rating if you register on the solved.ac Arena page.
  • Registrations are open until 5 minutes before the contest starts. You can cancel registration anytime before the contest begins.
  • You can participate in the Arena without registering. In this case, your rating will not change.
  • Please note that your rating will change even if you don't make a submission in the arena if you're registered.

Among the participants registered in the Arena, the top 3 on the scoreboard and 3 randomly selected participants will receive a metal badge commemorating their participation in the Arena as a small souvenir.

Please refer to the following guide for registering in the Arena contest:

We look forward to your participation. Thank you!

UPD: Editorial: https://solved.ac/en/arena/1/editorial

  • Vote: I like it
  • +246
  • Vote: I do not like it

»
15 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Do you have a picture of the badge?)

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

So this is like AtCoder from Korea?

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

    The solved.ac site is mainly for making votes/contributions about problem difficulty levels for Baekjoon Online Judge(BOJ), a Korean online judge.

    Since a lot of community contests are held on the BOJ platform, we thought it could be fun if we rate these contests. The Arena contests are our attempt to do them. So it's like AtCoder, but the contests' competition format will likely vary from one to another.

    → Reply
    • »
      »
      »
      15 months ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      Why not embed rating into BOJ then?

      → Reply
      • »
        »
        »
        »
        15 months ago, # ^ |
          Vote: I like it +13 Vote: I do not like it

        BOJ and solved.ac are run by different parties and operate independently. It'll be great if we can merge the sites into one in the future, but it is not the case for now.

        → Reply
»
15 months ago, # |
  Vote: I like it +18 Vote: I do not like it

Interesting format and great time, sounds like a fun contest.

→ Reply
»
15 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Ig It is not available in English format :)

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

    Statements for GA 1 are available in English!

    → Reply
»
15 months ago, # |
  Vote: I like it +1 Vote: I do not like it

I liked the contest overall! However, just FYI, Move Stones was already used in TCO Algorithm Final 2017 as 450.

→ Reply
  • »
    »
    15 months ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Happy to hear that you liked the contest. Thank you!

    Thanks for informing us about the TCO version; The TCO one seems harder than our version.

    → Reply
»
15 months ago, # |
  Vote: I like it 0 Vote: I do not like it

Auto comment: topic has been updated by Konijntje (previous revision, new revision, compare).

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

Fun contest, the format is fresh! Liked the problems. I am not against having multiple easier problems and a few harder ones, because then you can spend longer on the harder ones. Sadly couldn't implement D in time.

→ Reply
  • »
    »
    15 months ago, # ^ |
      Vote: I like it +1 Vote: I do not like it

    Thank you for your participation! Problems will be uploaded in BOJ within a day, so you can upsolve it if you want.

    → Reply
»
15 months ago, # |
  Vote: I like it +18 Vote: I do not like it

Looks like the security setup is a bit too strict for the D programming language on the judge.

For problem I, see how an accepted submission 64679461 differs from a non-accepted one 64679467 only in one line: GC.disable (); at program start is commented out.

GC is garbage collector. When I turn it off, the program runs successfully. When I don't touch it (it's on by default), the program fails somehow (Wrong Answer or Runtime Error depending on the compiler and apparently some other stuff).

By trial and error, I've concluded that a solution can't start more threads. And GC does need another thread when it runs a collection cycle. Perhaps it's somehow circumvented for Java already, because, as I remember, there are a few threads there by default. Maybe the same can be done for D?

→ Reply
  • »
    »
    15 months ago, # ^ |
      Vote: I like it +18 Vote: I do not like it

    Thank you for the comment about the D language! I'll forward your comment to Baekjoon.

    → Reply