Sunday, August 3, 2025

An open week

The 37th International Olympiad in Informatics took place this week in Sucre, Bolivia (problems, results, top 5 on the left). It was a bit more tricky than usual to get to, but I'm sure the contestants, the leaders and the organizers also gathered quite a few good memories for a lifetime :) Congratulations to Hengxi Liu on a quite convincing win!

I continue to be amazed about many things IOI:

  • the repeat participants who keep pushing me down the hall of fame even further, this year Ryan Bai and István Ádám Molnár
  • the repeat problemsetters that keep coming up with amazing problems, setting three out of six problems just like two years ago: square1001 and E869120.
  • the amazing openness of the organizers who publish both the GA minutes (2024, all, this year's minutes will probably appear a bit later?) and the IC minutes (March 2025, all). I am learning a lot about organizing those great events, and about democratic processes in general, from reading those.

Keep up the good work!

Codeforces hosted its Round 1040 between the IOI competition days (problems, results, top 5 on the left, analysis). Kevin114514, who as I understand was too young to qualify for China's IOI team (please correct me if I'm wrong!), instead had to settle with AKing this round and overtaking jiangly for the second place in the overall rating. Well done!

Thanks for reading, and check back next week.

7 comments:

  1. Hello Petr,

    I hope you are doing great.

    In recent codeforces round I see that you used JHelper plugin to code the solution, I could not install because plugin incompatibility.

    Can you please how you manage to install or share plugin ?

    Thanks,
    Best Regards

    ReplyDelete
    Replies
    1. Actually I have the same problem, I got a new laptop recently and could not install JHelper there, so I have used the old laptop to solve the round yesterday :)

      I want to try rebuilding the plugin from source, but did not get to it yet.

      Delete
    2. I rebuild plugin from source but it is working only when I run plugin locally , when I try to install it I am getting

      "Plugin ‘JHelper’ requires plugin ‘com.intellij.modules.cidr.lang’ to be installed".

      Could not make it work. Seems clion stopped supporting com.intellij.modules.cidr.lang , but I could not find it's replacement. If you find something please let me know in this comment.

      https://github.com/emli/plugin

      Delete
  2. However you run plugin locally and it works. So I am running plugin in Intellij IDEA - it opens latest Clion installed Jhelpher plugin. I am using in this way.

    In case you can use this approach.

    ReplyDelete
  3. Hi Petr,

    I managed to fix the issue. Please try install JHelper from here

    https://github.com/emli/plugin/releases/tag/0.19.2

    Also make sure Instruction:

    Check if you have the “Use the ReSharper C++ language engine (CLion Nova)” option enabled in File | Settings | Advanced Settings in CLion.
    If it is enabled:
    1. Disable the checkbox.
    2. Restart CLion.

    Let me know if it's works for you

    ReplyDelete
  4. https://codeforces.com/blog/entry/145628

    ReplyDelete
  5. > the amazing openness of the organizers who publish both the GA minutes (2024, all, this year's minutes will probably appear a bit later?)

    Sadly, we will have to wait until 2026 as the GA minutes have to be approved by the GA before being published :'((

    ReplyDelete