Educational Codeforces Round 189 [Rated for Div. 2]
Difference between en7 and en8, changed 0 character(s)
<img alt="Neapolis University Pafos" src="/predownloaded/9a/33/9a332fadbb47050ba9405057df022a6e37eaf5c0.png" style="float:right;height: 150px; margin: 10px; max-width:40%;"/>↵
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Hello Codeforces!↵
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The series of Educational Rounds continues thanks to the support of the [Neapolis University Pafos](https://www.nup.ac.cy/bsc-in-computer-science-and-artificial-intelligence).↵

On [contest_time:2225] [contest:2225] will start.↵
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This round will be **rated for the participants with rating lower than 2100**. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest, you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.↵
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You will be given **6 or 7 problems** and **2 hours** to solve them.↵
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**This round is based on problems from the 2026 Tula Open Programming Championship.**↵

The problems were invented and prepared by [user:basalov_yurij,2026-04-16], [user:BledDest,2026-04-16] and me.↵

I would also like to thank the other problem authors of the championship: [user:ashmelev,2026-04-16], [user:Galina_Basalova,2026-04-16], [user:Rudom71,2026-04-16] and [user:my-maxi-box,2026-04-16]. Thank you, it is a pleasure working with you!↵

Many thanks to the round coordinator, Ivan [user:BledDest,2026-04-16] Androsov, for improving the quality of the problems and helping with their preparation.↵

Big thanks to our testers: [user:300iq,2026-04-16], [user:awoo,2026-04-16], [user:l-_-l,2026-04-16], [user:FairyWinx,2026-04-16], [user:Kirilliym,2026-04-16], [user:soup,2026-04-16], [user:Minder,2026-04-16], [user:KIRIJIJI,2026-04-16], [user:pusheen_1024,2026-04-16], [user:annasa,2026-04-16], [user:Sayleyd,2026-04-16], [user:dan00ile,2026-04-16], [user:egor4444ik,2026-04-16], [user:slash0t,2026-04-16], [user:tic_genie,2026-04-16], [user:alexanderanchishkin,2026-04-16], [user:vkotov,2026-04-16] for their valuable advice and suggestions!↵

And of course, huge thanks to Mike [user:MikeMirzayanov,2026-04-16] Mirzayanov for great systems Polygon and Codeforces.↵

Our friends at Neapolis University Pafos also have a message for you:↵

**CSAI: First admission deadline approaches &mdash; April 28, 2026.**↵

Apply for the BSc in Computer Science & Artificial Intelligence at the Neapolis University Pafos. Up to **[40 full scholarships](https://lp.jetbrains.com/csai-program/how-to-apply/)**, provided by the **JetBrains Foundation**, are available this year.↵

##### **Key Dates**↵
- **Application Deadline**: April 28, 2026, 11:59 pm UTC↵
- **Mandatory Entrance Test**: May 3, 2026↵

##### **A great opportunity: [ACTS 2026.2 Camp](https://lp.jetbrains.com/academy/acts/2026.2/)**↵

To improve skills and prepare for intense programs like CSAI, we encourage applying for the **ACTS 2026.2 Camp in Germany (July 10-20, 2026)**.↵

- **Tracks**: Competitive Programming and Software Engineering.↵
- **Registration Deadline**: April 25th.↵

Ready to advance your coding journey? Join a leading computer science community today! Apply now and visit our dedicated pages for more details on how you can get involved.↵
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Good luck to all the participants!↵

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en8 English FelixArg 2026-04-19 12:18:56 0 (published)
ru15 Russian FelixArg 2026-04-19 12:18:30 0 (опубликовано)
ru14 Russian FelixArg 2026-04-19 12:17:08 532
en7 English FelixArg 2026-04-19 12:15:25 546
ru13 Russian chillingjellyfish 2026-04-18 21:28:00 1259
en6 English chillingjellyfish 2026-04-18 21:26:38 1058
ru12 Russian FelixArg 2026-04-17 16:08:08 26
en5 English FelixArg 2026-04-17 16:07:34 4
ru11 Russian FelixArg 2026-04-17 16:07:01 26
en4 English FelixArg 2026-04-17 16:06:38 26
ru10 Russian FelixArg 2026-04-17 16:04:48 35
en3 English FelixArg 2026-04-17 16:04:32 38
en2 English FelixArg 2026-04-16 18:31:22 12 Initial revision for English translation
en1 English FelixArg 2026-04-16 18:30:55 1675 Initial revision for English translation (saved to drafts)
ru9 Russian FelixArg 2026-04-16 18:24:39 4
ru8 Russian FelixArg 2026-04-16 18:24:30 4
ru7 Russian FelixArg 2026-04-16 18:24:22 8
ru6 Russian FelixArg 2026-04-16 18:24:11 4
ru5 Russian FelixArg 2026-04-16 18:23:58 4
ru4 Russian FelixArg 2026-04-16 18:23:44 8
ru3 Russian FelixArg 2026-04-16 18:23:30 4
ru2 Russian FelixArg 2026-04-16 18:23:18 4
ru1 Russian FelixArg 2026-04-16 18:21:04 1829 Первая редакция (сохранено в черновиках)