Hello, Codeforces!

We (KDOI Team) are glad to invite you to take part in Refact.ai Match 1 (Codeforces Round 985), which is the 8th CP contest held by us! You can view the previous rounds by us here.

• Number of problems: $$$9$$$ ($$$0$$$ interactive);
• Start time: Nov/09/2024 17:35 (Moscow time);
• Contest duration: $$$180$$$ minutes;
• Score distribution: $$$750-1250-1750-2250-2500-3000-3500-5000-5500$$$.

The problems were authored and prepared by Error_Yuan, wyrqwq, Otomachi_Una and me sszcdjr.

A few words from our sponsor:

We’re Refact.ai, an open-source AI Coding Assistant, and on November 9th, we’ll be hosting our first round on Codeforces! Winners will receive valuable prizes, and all participants will have a chance to get some exclusive merch from us.

Refact.ai is pushing AI beyond simple code completion. Soon, we’ll launch the Autonomous AI Agent—a developer’s buddy that handles real engineering tasks end-to-end, from planning and coding to testing and deployment. You can read more about us in this announcement.

If you're excited about AI in software development and want to build the future instead of focusing on the trivial, join Refact.ai, founded by a former OpenAI researcher. We’re looking for talented Researchers and Backend developers to join our team.

Prizes:

• 1st place: 500 USDT
• 2nd place: 300 USDT
• 3rd place: 200 USDT
• 4-5th place: 100 USDT
• Top 50 participants will get T-Shirts
• Additionally, 50 random participants from the top 51-500 will receive a T-shirt

Good luck in the contest!

On the right, badges of the authors. From top to bottom, left to right are Error_Yuan, Otomachi_Una, sszcdjr and wyrqwq respectively.

We would like to thank:

• Vladithur for his wonderful coordination.
• Again, Vladithur for the Russian translation.
• programpiggy for providing a few unused problems.
• gyh20, dXqwq, Sugar_fan, 275307894a, Kubic, PEIMUDA, A_zjzj, LMydd0225, abc864197532, N_z__, rui_er, ProjectCF, chenyifanlx, MatrixGroup, wsc2008qwq, EasonLiang, cayaxi09, Hanghang007, SpadeA261, IwannaEATaCUTEcaca-qwq, OctoberEstuary, MrPython, acwing_gza, chromate00, mathtsai, Codula, tibinyte for testing and giving useful feedbacks.
• You, for participating and getting positive delta.
• Last but not least, MikeMirzayanov for great Polygon and Codeforces platforms.

Good Luck & Have Fun!

UPD1. The Editorial was published.

UPD2. Congratulations to the winners!

1. Benq
2. jiangly
3. hos.lyric
4. Radewoosh
5. arvindf232
6. Nachia
7. ksun48
8. Szoboszlai10
9. Endagorion
10. _Serge_

Hello, Codeforces! & Happy Chinese Teachers' Day!

We (OICon Team) are so excited to invite you to take part in OICon Round 1 (Codeforces Round 896 (Div. 1) and Codeforces Round 896 (Div. 2)) which will start on Sep/10/2023 17:05 (Moscow time). You will be given 6 problems and 2.5 hours to solve them in both divisions.

• Please notice the unusual starting time!
• One of the problems has two versions but their statement are not exactly the same, which means that you can't pass the easy version using the code of the hard version. However, you can only make hacks when you pass both versions.
• There will be $$$0$$$ interactive problem in each division so you needn't read the guide for interactive problems.
• Score distribution:
  • Div. 1: $$$500-(500+750)-1000-1750-2500-3000$$$
  • Div. 2: $$$500-750-1250-(1250+1500)-2500-3250$$$

The problems were authored and prepared by Error_Yuan, duck_pear, programpiggy and me.

We would like to thank:

• Artyom123 for his long-term & high-quality coordination 😊😊😊
• Again, Artyom123 for the Russian translation 👍👍👍
• dqstz, BreakPlus, DisconnectedGraph for providing a few rejected problems 😭😭😭
• Um_nik, gyh20, MagicalFlower, Sugar_fan for Legendary GrandMaster testing 👽👽👽
• sansen, Kubic, Alex_Wei for International GrandMaster testing 😎😎😎
• rui_er, MatrixGroup, swiftc, themoon, N_z__, __builtin_gjr for GrandMaster testing 🧐🧐🧐
• HappyIvan, Azuma_Seren, User_Carrot, Wilson_Inversion, chen_03, Valters07, Lavine, Kieray for Master testing 😯😯😯
• guoziyang, NoCommander, Alan_dong, small_peter for Candidate Master testing 🤔🤔🤔
• Coffee_zzz, fAKezjf, purplevine, Black_Fate for Expert testing 😃😃😃
• mikcf, J.S.Eason for Specialist testing 🙂🙂🙂
• wz20201136 for the only Newbie testing 👀👀👀
• ChatGPT for getting 0 point in both divisions 🤡👈🤣
• And, You, for participating and getting positive delta 😘😘😘
• Last but not least, MikeMirzayanov for great Polygon and Codeforces platforms 🎅🎅🎅

Good Luck & Have Fun!

UPD1. Editorial is out.

UPD2. Contest is over! Congratulations to the winners!