Hello, Codeforces!

The year 2022 is finally coming to an end. Let's be clear. It's been a terrible year. Tomorrow I will make a wish, and you can easily guess which one.

I am writing these lines, and in a few minutes the Good Bye 2022 round will begin. And this inspires optimism and even pride in the community. Despite all these difficulties and troubles, we make rounds together and participate in them. Let's be grateful. And for this, let's say symbolic thanks to 2022 and a lot assistants: coordinators, problem writers, testers, participants and sponsors. We are many and we are together.

Can I have a little more detail on the Codeforces team?

Let me separately say thanks and words of admiration for the work of the coordinator of coordinators KAN and the senior developer geranazavr555. Both of you bring a lot to Codeforces, but your activity is not always noticeable. We appreciate it. Thank you!

I send thanks to Una_Shem: in the difficult conditions of broken global logistics, you do a lot so that the gifts are delivered to the winners, and the authors receive their reward.

Thanks to unreal.eugene for contributing to the development and kuviman for helping with setting up ci and other pipelines.

Who I will not say thank you to, it's cheaters! Ugh, to be like that. Please stay in 2022.

I'd like 2023 to be the year we regret leaving exactly one year from now.

Please make us happy!

Make our wishes come true.

* Image by ligrenok.

"It's been a long time since I came here, and I've really been through a lot." Koxia muses as she chatted idly with Mahiru.

Now that the Winter Festival is approaching. Among the flash of fireworks, in the chimes of the New Year, what is waiting for them to encounter?

Armed with girlish courage, they stepped onwards.

Hello Codeforces!

We (Nanako, m_99, huangxiaohua, SteamTurbine, triple__a, Nezzar) are very pleasured to invite you to take part in Good Bye 2022: 2023 is NEAR, which will take place in Dec/30/2022 17:35 (Moscow time)!

This round consists of 8 tasks waiting for you to solve in 150 minutes, and will be rated for everyone!

On behalf of the author team, please allow me to express our sincere thanks to:

• errorgorn, for useful guidance and brilliant advice during the coordination!
• KAN, for rechecking and translating the round!
• ak2006, tolbi, Tlatoani, gisp_zjz, Roundgod, Kaibad, xzm2024, Frozencode, woruo27, ayhan23, compute, muoshuo, conqueror_of_tourist, googol_S0, zengminghao, valeriu, manish.17, cuzperf, tibinyte, JuanPabloAmezcua, for providing valuable and constructive feedback during testing!
• 1tTx__, for the exquisite illustration!
• MikeMirzayanov, for great platforms Codeforces and Polygon!
• you and everyone, for participating and making this round have extraordinary significance!

This round is supported by NEAR. The participants in the top 2047 places will receive prizes as follows:

• Ⓝ 1024 for the first place
• Ⓝ 512 for the 2-3 places
• Ⓝ 256 for the 4-7 places
• ...
• Ⓝ 1 for the 1024-2047 places

Score distribution will be announced soon.

Besides the regular editorial, materials to be public after the round will also include the Chinese statement and the Chinese editorial.

We hope you enjoy our problems and say Goodbye to your 2022 happily!

UPD1: Score distribution is 500 — 750 — 1250 — 1500 — 2000 — 2500 — 3250 — 4000.

UPD2: Congratulations to the winners!

1. Benq
2. maroonrk
3. Radewoosh
4. Um_nik
5. tourist
6. ksun48
7. ecnerwala
8. aaaaawa
9. DearMargaret
10. jiangly

Thanks all for joining!

UPD3: The editorial is available.

UPD4: The Chinese statement and the Chinese editorial have been added into the contest attachments.

Hello, Codeforces!

The Programming Club, IIT Indore is proud to present the 8th edition of its flagship event, Divide By Zero — Codeforces Round #841 (Div. 2) and Divide By Zero 2022, under the annual code-fest, Euristica'23.

You can check some of the previous editions of Divide By Zero prepared by us : Codeforces Round #399 (Div. 1 + Div. 2), Codeforces Round #474 (Div. 1 + Div. 2), Codeforces Round #714 (Div. 2).

The contest will take place on Dec/27/2022 17:35 (Moscow time). This round will be rated for all participants with a rating lower than 2100.

People who had a great contribution to making this round possible:

• Problems were authored by nishkarsh, ka_tri and me.

• sksusha8853, Phantom_Deluxe, Anurag203, nishu2002, hk2102, krishanu21saini and somyamehta_24 made a great contribution to the problemset.

• Thanks to ajit, awoo, NemanjaSo2005, Nahian9696, Qg3, CARBINE, TomiokapEace, maomao90, MasterRayuga and prvocislo for testing the problems.

• Thanks to adedalic for wonderful coordination and for giving great advice throughout the round.

• MikeMirzayanov for Codeforces and Polygon platforms.

You will be given 6 problems, and 2 hours to solve them. The points distribution will be updated later.

UPD1: Score distribution is 500 — 1000 — 1500 — 1500 — 2000 — 2750

UPD2: The editorial is up.

PRIZES: Twenty T-shirt will be given to:

• Top 10 Indian Participants

• Random 10 from top 100 (rank 11-100) Indian participants

Hope you guys enjoy the contest! See you on the leaderboard :P

About Euristica

Euristica is the annual flagship programming event of The Programming Club of IIT Indore. As part of Euristica, we conduct a variety of online competitions spanning different programming domains. These events are open and free for all, and there will be exciting prizes and goodies for the winners.

Head over to our website to find out more about the competitions.

UPD3: Here is the list of winners who won T-shirts. We will contact you guys soon. Congrats!

Top 10 Indian Participants

• socho
• kshitij_sodani
• rivalq
• aryanc403
• satyam343
• meme
• shadow9236
• JrNTR
• iLLusio
• ShlokG

Random 10 from top 100 (rank 11-100) Indian participants

• yash_daga
• vineeth_kada
• GoatTamer
• Yomapeed
• killer_god
• orientor
• milind0110
• Chimpanzee
• mayankfrost
• hsrb

We have uploaded the link to the code for generating random numbers and ranklist here.

Dear Santa Claus. Please make 2023 a happy year, not just that. Please, we all need this.

Hello, 2023!

And we have traditional gifts!

Change Handle Feature

Hurry! Only until the 10th of January, you can change your handle (but only once)! Note that it will be possible to roll back the changes or change the handle again only after a year. Be careful what you wish for.

You can change your handle to the new one which wasn't used before by anybody or which was used by you before. The links to a profile page with an old handle would automatically redirect to the actual profile.

Again, this year if you took part in at least 10 rounds you can request a handle of an inactive participant. It means that the participant should have a period of activity on Codeforces of at most 180 days, this period should be in 2020 or earlier. The inactive participant can't have posted comments, messages, and so on. It can't take part in more than 2 contests. It will be automatically renamed and informed by email. A user has the opportunity to request back his/her handle: in this case, we will roll back the change and return your previous handle to you. If you can't change your handle to another, it means that some requirements don't meet. Please do not ask me to do something with it. Especially, I do not like requests like "this is my second account, I took an interesting handle myself". I'm not Santa Claus.

Talking about handles I always
reminisce the following story. Once a user wrote me the message: "Please change my handle from I_love_Valya to I_love_Sveta, as I no longer love Valya ..."

New Year's Masquerade of Colors and Ranks

The traditional magical tab has appeared in the profile setting. Happy New Year!

Hello, Codeforces!

We are pleased to announce the second “Hello Muscat 2023” ICPC programming bootcamp, the continuation of the “Hello” bootcamp series, organised by Harbour.Space University, in collaboration with PhazeRo, Gutech, UK Oman Digital Club, Leagues of Code, Gutech CS Club and Codeforces!

We are inviting all of you to join us from March 8th to March 16th, 2023 in Muscat, Oman for an intense 8 days of programming! It is not only a great opportunity to train but also a chance to discover a new amazing country. There are many reasons why you must visit Oman at least once in your life, from its great people to its natural beauty and surrounding peace. March is an especially great time to visit Oman if you want to enjoy nice beach weather — don’t miss it!

As always, we can’t wait to see you there to learn, practice and compete on the international stage, smoothing your road towards the joined World Finals 2022 and 2023 in Egypt!

Our coaching line-up combines talent and experience, featuring ICPC world champions winners and finalists, as well as legendary names from the field of competitive programming: Mike Mirzayanov MikeMirzayanov, Yahor Dubovik 244mhq, Artem Plotkin Rox, Maksym Oboznyi MaksymOboznyi and Nikolay Budin budalnik.

It will be an amazing opportunity for teams from all over the world to learn from these well-known and successful coaches in the ICPC world!

The Bootcamp will be split into three divisions:

• Division A. Division A will be a mirror of the Petrozavodsk Programming Camp. Suitable for teams who already qualified for the world finals ICPC or are aiming that high. Participants of division A will be solving contests in the same conditions as a real competition to perform with more confidence in the ICPC world finals.

• Division B. Designed to help teams prepare for the next season of ICPC regional competitions. Appropriate as an introduction for teams and students just getting their foot in the door of the world of ICPC and competitive programming competitions in general. Division B will have thematic contests and lectures.

• Division C. Designed for newcomers to the world of ICPC competitive programming. For those with a handle on the basics but want to compete in future competitions and possible regionals, this division is the perfect starting point.

Types of participation: On-Site and Online

We believe that participation in our Bootcamp should be accessible by all teams wherever they are and that is why we made onsite and online types of participation.

20% Early Bird Discount is offered to universities and participants who register and pay before Jan 31st 2023.

You can ask any questions by email: [email protected]

Hello Psyho, this is Mike. We are happy to help with likes. So, Codeforces?

He waits for your likes here: https://twitter.com/FakePsyho/status/1605570944537280512?t=MV0OksdeUb8FXKApncDZcw&s=19

I believe that 40 facts are too few for us. We need more!

Hello, Codeforces!

Cybros, the competitive programming club of LNMIIT Jaipur, is happy to invite you to participate in Codeforces Round 840 (Div. 2) and Enigma 2022 - Cybros LNMIIT which will be held on Dec/19/2022 17:35 (Moscow time).

You will be given 6 problems and 2 hours to solve them. The round will be rated for participants with rating strictly less than 2100. Division 1 participants can also participate unofficially in the round.

The problems were prepared by me, DreadArceus, ...nvm, warks, .utk., and og_. We would like to thank:

• Aleks5d for coordinating the round and translating the statements into Russian,
• svince, tankman890, SoCloseButStillSoFar, shiviDON, abhigyan10, and pulkit_jain for discussing problems and coming up with problem ideas that didn't make it to the final problem set,
• KAN, satyam343, GoatTamer, physics0523, MasterRayuga, blitztage, weakestOsuPlayer_244, Gaurav3478, 18o3, jainmilind, Milind_Sharma, DragoPhoenix, Nitin1605, AloneMusk, master._.mind, TarunAga, gaurav1910, mePrakhar, 4qqqq, LoLZeS666, PHOENIX_RISER, WORTH, Athern, sleepinGiant, and C-3PO for testing the problems and providing invaluable feedback, and
• MikeMirzayanov for the great platforms Codeforces and Polygon.

Good luck and have fun!

UPD1: Score distribution is 500 — 1000 — 1500 — 2000 — 2000 — 3000

UPD2: Congratulations to the winners!
Overall:
1. tourist
2. Um_nik
3. gyh20
4. neal
5. noimi

Div. 2:
1. apei
2. yyyz04
3. bobbilyking
4. rainboy
5. RNS_JK

UPD3: The editorial has been published.

About Enigma

Enigma is a part of Plinth 2023, LNMIIT Jaipur's tech fest. If you are an Indian school/college student, we will also hold an onsite round of Enigma from 27 to 29 January, 2023. You can register for the onsite round by filling the google form on our Instagram page.

As a part of Plinth, we will also conduct IUPC (Inter University Programming Contest), which is an ICPC-like contest for teams of three people. This contest is good practice for the real ICPC rounds. Both Enigma onsite and IUPC will have cash prizes and goodies.

Привет, Codeforces!

On Dec/18/2022 17:35 (Moscow time), Codeforces Round 839 (Div. 3) will start. This is a usual round for the participants from the third division. The round will contain 7 problems, which are mostly suited for participants with rating below 1600 (or we hope so). Although, as usual, participants with rating of 1600 and greater can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks.

You will be given 7 problems and 2 hours and 15 minutes to solve them. The penalty for a wrong submission is equal to 10 minutes.

We remind you that only the trusted participants of the third division will be included in the official standings table. As it is written on the blog which you can access by this link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:

• take part in at least two rated rounds (and solve at least one problem in each of them),
• not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. We would like to thank the testers of the round: ermukanoff, soup, lankin.i, Fanarill, stAngel and senjougaharin. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

UPD: Editorial is out

Hello, Codeforces!

Winter holiday is coming! And we are excited to invite you to our third round, Polynomial Round 2022 (Div. 1 + Div. 2, Rated, Prizes!), which will be held on Dec/17/2022 17:35 (Moscow time). You are given 8 problems and 2.5 hours to solve them.

All problems were written and prepared by Ecrade_, Little09, ChthollyNotaSeniorious, JianfengZhu, Cirno_9baka, mejiamejia and me.

And thanks to dorijanlendvaj, gisp_zjz, gamegame, triple__a, Chenyu_Qiu, Suiseiseki, aaaaawa, leukocyte, waaitg, Kubic, LHQing, RedLycoris, lucaperju, njupt_lyy, Kilo_5723, Huah, prvocislo, foreverlasting, thanhchauns2, Rhodoks, JohnVictor, Psychotic_D, VinstaG173, dannyboy20031204, 4qqqq, CoupDeGrace, wsyear, 5ab, Lavine, absi2011, UtopianZ for testing and good advice, antontrygubO_o for his excellent round coordination and help with preparation and MikeMirzayanov for great systems Codeforces and Polygon.And you, for participating!

This is our third round! Although you may find members in our team and testers who helped are not the same as the past, our permanent love and enthusiasm for coding will not change. Conspicuously, great efforts have been put in it. We are sincerely looking forward to your participation and we hope everyone will enjoy it. Besides, this round is sponsored, which indicates that everyone has an opportunity to get the prize!

UPD1: Here is the score distribution:

500 — 1000 — 1500 — 1500 — 2000 — (1500 + 1000) — 3250 — 4000

UPD2: Sorry to everyone! We must apologize because the pretest of B is not strong, leading to FST for many people. It is our fault! We don't want to make excuses. This time, we did a bad job and let everyone down. We all blamed ourselves sadly. Although we have invited a lot of testers but most of them passed all the tests, and even some of them get 'WA', they fixed their code and passed it. So we didn't pay too much attention to it -- we thought it was 'normal'. However, we didn't suppose the pretests were so weak that lots of participants get FST. Sorry again! (>_<)

And personally, firstly, I must apologize to all of you. I let you down this time. I blamed myself sadly. And I accept all the critical opinions. However, secondly, I know that you must feel angry when you find your B got FST, and that's all our fault, but because my birthday is coming, I intended to use this contest to record the growth of me and my team members, as well as my happy memories on codeforces, so could you please don't scold me too harshly when criticizing me? (Actually I am crying when typing this words; I blamed myself sadly when I saw lots of FST). I will regard all your comments as the most valuable things which urge me to become a better person and help me grow to a more mature person, but maybe I will be very painful if I see comments or messages as 'you are a trash''trash round'. (⑉꒦ິ^꒦ິ⑉)

Sorry! We did a bad job because of our carelessness this time, but we promise we will try our best to improve our comprehensive abilities, and bring a better round next time! We will keep in mind every word of encouragement and criticism, which is the driving force for our growth. Wish you happy everyday! (•ω•)

UPD3: Tutorial is available.

Thanks for all the warmth and kindness!!! I felt deeply guilty during the past few hours, now I feel better. I really appreciate your warmth and kindness!!! (●'◡'●)

We made the contest just because we would like to share our interesting ideas with you. If you like any of the ideas, we will be very delighted!!! o(≥ω≤)o

UPD4:Congratulations to the winners

1. Um_nik
2. maroonrk
3. tourist
4. inaFSTream
5. ksun48
6. LJC00118
7. ugly2333
8. bruhopen
9. ecnerwala
10. Rewinding

And for my personal gifts: the two random number is 91 and 1028, so congratulations to sd0061 and regain0001!!! (The rank contained the virtual participants at that time, which improves randomness, only if the time and the rank both accorded with the number , you can get the gifts!!!) o(〃'▽'〃)o

Thanks to all the warmth and kindness!!! You really light up my heart!!! We will try our best next time and prepare a better round to share our interesting ideas with you!!! ✧⁺(๑•ω•๑)⁺✧

And here is the information from our title sponsor:

Prizes

The participants who end up in the first 255 positions will receive prizes. The participant on the first place will receive $256, the next two participants will receive $128, the next four participants will receive $64, etc. Prizes will be distributed in OP (Optimism) tokens.

About Polynomial

Polynomial is building in decentralized finance – a more fair, accessible, efficient, and transparent financial system enabled by crypto. Polynomial automates financial derivative strategies to create products that deliver passive yield on various assets. Polynomial Earn is the first DeFi Options Vault (DOV) that executes completely on-chain by selling options directly to an AMM.

If you have a background in mathematics or software engineering and a knack for problem-solving, we want to hear from you. You will have the opportunity to work on cutting-edge technology and tackle complex problems alongside a talented and driven team.

By joining us at this early stage, you will make fundamental decisions that will shape the course of Polynomial. We prefer passionate, quick learners with a history of excellence.

Find out more about us on our website polynomial.fi or texting rivalq.

If you wish to be part of our remote-first team or apply for an internship, please fill in the form or email [email protected]. Make sure to apply before Dec 20, 2022.

We wish everyone good luck and have a positive delta!

Hello Codeforces!

On Dec/16/2022 17:35 (Moscow time) Educational Codeforces Round 140 (Rated for Div. 2) will start.

Series of Educational Rounds continue being held as Harbour.Space University initiative! You can read the details about the cooperation between Harbour.Space University and Codeforces in the blog post.

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.

You will be given 6 or 7 problems and 2 hours to solve them.

The problems were invented and prepared by Adilbek adedalic Dalabaev, Vladimir vovuh Petrov, Ivan BledDest Androsov, Maksim Neon Mescheryakov, Alexey shnirelman Shnirelman and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all the participants!

Our friends at Harbour.Space also have a message for you:

Harbour.Space University has partnered with Noventiq, the leading global solutions and services provider in digital transformation and cybersecurity, to offer motivated Data Scientists the opportunity to work and study in Barcelona. We are looking to distribute scholarships for intensive study programmes at the highest level, for eligible candidates that will be able to join our journey.

Candidates will be working on the following tasks:

• Invent and implement approaches to solving problems of computer vision and machine learning, form requirements together with the team;
• Plan experiments, train models, evaluate their quality and embed them in pipelines;
• Work with data, the formation of technical requirements for markup;
• Register the results of training runs of models and track the dynamics of their performance;
• Write algorithms for pre- and post-processing of images and videos, the logic of scenarios for processing media data;
• Conduct research in the field of Computer Vision: classification, detection, segmentation;
• Engage in the optimization of neural networks: distillation, quantization, pruning;
• Prepare models for production;
• Carry out the development of custom algorithms and modules of our video analytics platform.

All successful applicants will be eligible for a 100% tuition fee scholarship (22.900 €/year) provided by Noventiq company for Data Science.

CANDIDATE’S COMMITMENT

Study Commitment: 3 hours/day ‍

You will complete 15 modules (each three weeks long) in one year. The daily class workload is 3 hours, plus homework to complete in your own time.

Work Commitment: 6 hours/day ‍

Immerse yourself in the professional world during your apprenticeship. You’ll learn from the best and get to apply your newly acquired knowledge in the field from day one.

University requirements

1. Bachelor's degree in the field of Mathematics, Statistics, Data Science, Computer Science or similar
2. English proficiency

Work requirements

• Excellent knowledge and experience in using Python, as well as TensorFlow/PyTorch;
• Experience in implementing Deep Learning models for commercial projects;
• Experience in solving real problems in the field of Computer Vision;
• Experience with Linux OS, Git, Docker;
• Understand the principles of operation of current popular architectures of neural networks;
• Possession of the culture of conducting experiments, you know about reproducibility and logging, you can objectively assess the quality of the model;
• Spanish language proficiency;

Good luck,

Harbour.Space University Team

UPD: Editorial is out