ppavic's blog

Croatian Olympiad in Informatics (COI) 2024
By ppavic, history, 10 days ago, In English

Bok!

I am delighted to invite you to a mirror of the Croatian Olympiad in Informatics!

As part of the COCI series, we are hosting an Internet online contest with problems from the Croatian Olympiad in Informatics 2024. The contest is primarily intended for high school contestants, but is open to all interested!

This contest is used in Croatia to select members of the IOI 2024 team. There will be three to five tasks and the contest will be five hours long. The contestants will have full feedback with at most 50 submissions per task.

The problems were set by dorijanlendvaj, keko37, Agnus, psruk and myself.

This year, we are trying something new! Instead of the usual 5-hour mirror format, we are adopting the new format where you are given 24 hours and you can start your own 5 hours whenever you like. Notice that if you start less than five hours before the end of the contest, your window will still be 5 hours long.

It will be held on Sunday, April 28, starting at 15:00 (GMT/UTC).

Check out your local times at https://hsin.hr/coci/next_contest.html.

You may use Python, Pascal, C, C++, or Java as your programming language of choice.

The two relevant websites are:

https://hsin.hr/coci/ — information about the contest

https://evaluator.hsin.hr/ — judging system

We hope that you will join us or encourage your students to do so!

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9 days ago, # |
  Vote: I like it +24 Vote: I do not like it

Has the Croatian team been chosen yet ?

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    9 days ago, # ^ |
      Vote: I like it -63 Vote: I do not like it

    why are you asking? what's your concern

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      9 days ago, # ^ |
        Vote: I like it +9 Vote: I do not like it

      why are you asking? what's your concern?

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        9 days ago, # ^ |
          Vote: I like it -15 Vote: I do not like it

        why are you asking? what's your concern?

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          7 days ago, # ^ |
            Vote: I like it -21 Vote: I do not like it

          why are you asking? what's your concern?

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            6 days ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            why are you asking? what's your concern?

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    9 days ago, # ^ |
      Vote: I like it +54 Vote: I do not like it

    No... There are still 3 tests left for the team to be chosen (COI and 2 Final TSTs).

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9 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Zdravo. Sounds like a really interesting format.

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8 days ago, # |
  Vote: I like it +36 Vote: I do not like it

Registration is now open!

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7 days ago, # |
  Vote: I like it +24 Vote: I do not like it

Task statements in English are unavailable

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6 days ago, # |
  Vote: I like it +12 Vote: I do not like it

Will the ranking be published after mirror finishes?

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6 days ago, # |
  Vote: I like it +1 Vote: I do not like it

are tasks ordered by difficulty?

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6 days ago, # |
  Vote: I like it 0 Vote: I do not like it

Hello, my student started at ~20(UTC+3) and the system has shown that he has only 3 hours. In the blog, it is said that:

Notice that if you start less than five hours before the end of the contest, your window will still be 5 hours long.

Is there a system bug or something else? Thanks!

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    6 days ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    The length written in the blog states a 24 hour period, and if started during that period, the contest will last 5 hours. Sorry if it was a bit unclearly written.

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5 days ago, # |
  Vote: I like it +18 Vote: I do not like it

I wrote down brief solutions on my blog (https://errorgorn.github.io/2024/04/30/COI.html) if anyone wants to know solutions before the official editorial is released

Do tell me if there are more elegant solutions

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