commandox's blog

By commandox, 2 months ago, In English

[Site Discontinuation] oichecklist.pythonanywhere.com after 31st July 2026


Checklist made by [user:RezwanArefin01] will be discontinued after 31st July 2026

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Website: https://oichecklist.pythonanywhere.com

Blog: https://mirror.codeforces.com/blog/entry/62898

What to do now?

Kindly Backup your progress to another checklist.

Check Out: https://checklist.spoi.org.in/

Or If you prefer an Excel Format like me ;).

Here, It's https://docs.google.com/spreadsheets/d/1IYqjADJTyYWX99zxfGLxZ5DIpa-jsRnsOf_Tkxc4DhQ/edit?usp=drive_link

Forked/Merged from checklist made by RezwanArefin01 and avighnakc

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By commandox, 2 months ago, In English

OI-TED-ARCHIVE — Preserve OI resources before they disappear

Original Blog: https://mirror.codeforces.com/blog/entry/150835

New Blog to keep mega torrent file information separate. + very frequent updates.

Torrent Info (v1.1.0 with IZhO+RMI - COMING SOON)

I will seed randomly (Morning/Night) (12hours a day for a week) — So, Everyone gets the chance to download. :D

I will stop after 1 week unless someone asks again.

Recommendation

  • If you can, Please do seed.
  • If you solve APIO, Please download it — It's the toughest to find on web.

First time?

That's it.

How to update/continue? (without downloading whole again)

  • Download the newer .torrent file.
  • Add it to your torrent client and give same location as previous path.
  • E.g. If path is like C:/NewFolder/OI-TED-ARCHIVE/{ioi,apio,coci...etc}. Then give, C:/NewFolder/ only for continuing into newer version.
  • Right Click & click Check button. It checks for existing files and prevent overwriting whole if you misconfigured path before.
  • Then Start — It will automatically skip the existing files which have same checksum. And download only the missing/corrupt/modified files.

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By commandox, 2 months ago, In English

MEGA TORRENT BLOG: https://mirror.codeforces.com/blog/entry/151059

v1.1.0 is coming soon in upcoming months. Goodluck for IOI2026, APIO2026 and Other OI2026.


OI-TED-ARCHIVE

OI Tasks + Editorial + Testdata Archive (+ Graders & Results)

Goal: Preserve complete Olympiad in Informatics resources before they disappear.


Current Status

Latest progress: https://docs.google.com/spreadsheets/d/1XPHTMTUGaKrDvCvNyh6LWuWEddNSxwxJhEB2NlUezOI/edit?usp=sharing

For Upcoming Problems, 2 Major release will be made each year. Expect First Update around July-Auguest.


OI-TED-ARCHIVE LINKs

Check Sheet "ARCHIVE" for Detailed & Updated Archive Info

Items List: https://archive.org/details/@moon_moonlight_144/lists/1/oi-ted-archive

Check Changelog Section in this Blog for detailed table.

Olympiad Link Status
APIO https://archive.org/details/oi-ted-apio-archive Done
BOI https://archive.org/details/oi-ted-BOI-archive Done
CEOI https://archive.org/details/oi-ted-ceoi-archive Done
COCI-COI https://archive.org/details/oi-ted-coci-archive Done
EGOI https://archive.org/details/oi-ted-egoi-archive Done
EJOI https://archive.org/details/oi-ted-ejoi-archive Done
IOI https://archive.org/details/oi-ted-ioi-archive Done
IZhO https://archive.org/details/oi-ted-izho-archive COMING SOON
JOI (EN) https://archive.org/details/oi-ted-joi-archive Done
JOI (JP) https://archive.org/details/oi-ted-joi-jp-archive Done
NOI Singapore https://archive.org/details/oi-ted-noisg-archive Done
OOI (OpenOlympiadInInformatics, Moscow) https://archive.org/details/oi-ted-ooi-archive Done
USACO (Testdata+Editorial) https://archive.org/details/oi-ted-usaco-archive Done
CSES 400 Problem Set (Testdata) https://archive.org/details/oi-ted-cses-archive Done

Why OI-TED-ARCHIVE?

Expand to know

How did I achieve this recovery rate? Methods + sources

Expand to Read

Update Cycle

  • For Upcoming Problems, 2 Major update will be made each year.
  • First update after Majority of OIs would have held. (Around July-August)
  • Second update: it's not decided yet...how i will use it. Your feedback will be valuable.

Changelog

v1.0.0 + v1.0.1 Minor Patch

Expand to Read

v1.1.0 (COMING SOON) — RMI+IZhO+OIs For 2026 will be added.

Expand to Read

How to download?

Expand to see instructions

Why ZST/XZ compression method?

Expand to see instructions

How to extract TAR.XZ or TAR.ZST?

Expand to see instructions

Technical details

Expand to see about integrity check, checksum verification, oi result format

Failed Attempt

Expand to Read

Future Plans

  • Maybe another new OnlineJudge — To host everything in one place. Or contributing to existing OJs to make them better.
  • After 3 years, I will make an ICPC Archive containing all problems from each country/region.

Credits / Acknowledgements

This archive wouldn't be possible without great help from multiple platforms and people who keep OI resources accessible.

Special thanks to:

  • Internet Archive: for hosting OI-TED-ARCHIVE
  • OJ.UZ: many tasks and graders were scraped directly from there.
  • DMOJ.ca: for sharing valuable testdata.
  • LOJ.ac: for keeping testdata & attachments publicly accessible
  • CSES.fi: for maintaing an extremely well-organised collection of BOI resources, the 400+ Problem set and many more OIs.
  • Anonymous Online Judges / Contributors — several missing or unrecoverable testdata files only exist today because some individuals privately shared them. Without that help, parts of this archive would simply not be complete.
  • Thanks to farkon00 for suggesting that i scrape Results along with TED.
  • Thanks to nanoblob for letting me know about BalkanOI 2022 Tasks that i missed & sharing valuable links.
  • Thanks to toma_ariciu for sharing BalkanOI (2007 & 2018), RMI (2023 & 2024). And most valuable BalkanOI 2022 (aka RMI 2022) tasks which were impossible to get.
  • Thanks to psz2007 for sharing invaluable BalkanOI (2012 & 2015 + many old ones) tasks & testdata. It was impossible for me to get. Thanks A Lot for your great help.
  • Thanks to many Codeforces blogs and comments for sharing many valuable links for downloading OI content.
  • Thanks to the Codeforces Community for continued support & valuable suggestions.

Each and Every Step For Building OI-TED-ARCHIVE Is Verified Multiple Times.

If you find any issue, Please let me know in Comments.

Let me know if you’d like to see more OIs added or if you have any suggestions.


THANK YOU SO MUCH FOR YOUR SUPPORT 💛

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