By AdvancerMan, history, 5 weeks ago, In English,

Hello Codeforces!

We're glad to invite you to Codeforces Round #610 (Div. 2), which will be held on Dec/24/2019 17:35 (Moscow time). It will be rated for all participants with a rating below 2100. You will be given six problems and two hours to solve them.

The problems were invented and prepared by the team from ITMO University: Supermagzzz, Stepavly, AdvancerMan, unreal.eugene, MikeMirzayanov.

Special thanks to MikeMirzayanov for great systems Codeforces and Polygon and coordinating round preparation.

UPD1: Special thanks to the ITMO University testers team: Nebuchadnezzar, Alexvsalex, Darui99, golikovnik, sharepoLOVEDDD, Mr.Hakimov, zergey.gad, MeowMr, Ilya-bar, 1ncendiary

There is an interactive problem in the round. You can read the guide for interactive problems here.

UPD2: Scoring: 500 — (500 — 1000) — 1750 — 2500 — 2500

We hope you will enjoy the problems. Good luck, wish you a high rating!

UPD3: Congratulations to the winners!

  1. Tsypkokokokoko
  2. K.Yuuki
  3. hyhtsdy
  4. ptica
  5. junukwon8
  6. A_n_o_n_y_m_o_u_s
  7. AnotherRound
  8. ark_84
  9. rtilikay
  10. p1rattttt

Editorial will be published soon.

UPD4: Editorial is out!

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By 300iq, 6 weeks ago, translation, In English,

Hello, Codeforces community!

I'm glad to invite you to Codeforces Round #609 (Div. 1) and Codeforces Round #609 (Div. 2), which will be held on Dec/21/2019 14:05 (Moscow time). The round will be rated for both divisions.

The problems were taken (mostly) from the ByteDance — Moscow Workshops Online Contest, that's happening at the same time. They were prepared by myself and tested by wxhtxdy, Claris, quailty, jiry_2 (camp TA team), and gamegame, isaf27, tmwilliamlin168, mango_lassi, WNG, lewin, sas4eka, Feynman, Aleks5d,MrDindows.

ByteDance is a technology company operating a range of content platforms that inform, educate, entertain and inspire people across languages, cultures, and geographies. ByteDance has partnered with Moscow Workshops ICPC and Codeforces to organize a top tier and exclusive training camp for the International Collegiate Programming Contest. The upcoming Programming Camp will be held in Beijing from February 10th to 16th, 2020.

ByteDance — Moscow Workshops Online Contest is an opportunity to participate as teams in this camp.

You can find more information about this training camp, including registration and prizes at https://programcamp.bytedance.com/.

UPD: Editorial

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By pikmike, history, 6 weeks ago, translation, In English,

Hello Codeforces!

On Dec/19/2019 17:35 (Moscow time) Educational Codeforces Round 78 (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 problems and 2 hours to solve them.

The problems were invented and prepared by Roman Roms Glazov, Adilbek adedalic Dalabaev, Vladimir Vovuh Petrov, Ivan BledDest Androsov, Maksim Ne0n25 Mescheryakov 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:

Codeforces and Harbour.Space

Hi Codeforces!

The deadline to apply for our Master’s Scholarship in Bangkok is very soon!

Don't miss your chance and apply for our progressive Master’s programs in Data Science and Cyber Security in just 3 steps:

1. Submit your CV to see if you are an eligible candidate for the scholarship
2. If your profile matches the requirements, one of our admissions officers will get in touch with you
3. Apply for the program, pay the 125€ application fee, pass a series of interviews, and if you’re accepted, pack your bags to Bangkok!

And if you know someone who might be interested in Digital Marketing, High Tech Entrepreneurship, Interaction Design or FinTech, send them our way!

MORE INFO→

Also, don’t forget to read our newest blogs!

Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 HIR180 6 106
2 neal 6 162
3 receed 6 172
4 Geothermal 6 174
5 cerberus97 6 179

Congratulations to the best hackers:

Rank Competitor Hack Count
1 Akulyat 24
2 hoke_t 20
3 dhxh 18:-1
4 SweetPrinces 14
5 WNG 13:-1
255 successful hacks and 458 unsuccessful hacks were made in total!

And finally people who were the first to solve each problem:

Problem Competitor Penalty
A Dalgerok 0:01
B neal 0:04
C HIR180 0:08
D __.__ 0:17
E gxnncrx1993 0:20
F wxhtxdy 0:07

UPD: Editorial is out

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By arsijo, 6 weeks ago, In English,

In 2019, with the support of XTX Markets, 6 rounds of the new Codeforces Global Rounds were held. Each round was common for both divisions and had 7–9 problems. The duration of the rounds was 2-3 hours, depending on the number and complexity of the problems. All such rounds were rated for all participants. At each such round, 50 brand T-shirts were handed out, and we gave T-shirts to all authors and problem testers as well.

The prizes for the 6-round series in 2019:

  • In each round, top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
  • The best 20 participants over all series get sweatshirts and place certificates.

Final results:

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By majk, 6 weeks ago, In English,

Hi!

Are you tired after a weekend of three (3) contests? Or are you ready for another one? On Dec/17/2019 18:05 (Moscow time) we will host Codeforces Global Round 6!

It is the sixth round of a new series of Codeforces Global Rounds supported by XTX Markets. The rounds are open for everybody, the rating will be updated for everybody.

You will be given 8 problems and 150 minutes to solve them. The scoring distribution will be 500-750-1250-1750-2000-2500-3500-4000.

The prizes for this round:

  • 30 best participants get a t-shirt.
  • 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

The prizes for the 6-round series in 2019 (current results):

  • In each round top-100 participants get points according to the table.
  • The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
  • The best 20 participants over the whole series get sweatshirts and place certificates.

The problems of this round were developed by me. I will be available on Discord to discuss the problems after the contest.

I would like to thank:

UPDATE: The round is over! I hope you enjoyed it despite the second half being more difficult than anticipated. The system test will begin shortly.

UPDATE 2: Editorial

UPDATE 3: Congratulations to winners:

  1. stO
  2. sunset
  3. tourist
  4. whzzt
  5. hos.lyric
  6. abacabadabacaba

UPDATE 4: Global Rounds 2019 final results

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Announcement of Codeforces Global Round 6
 
 
 
 
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By BledDest, history, 6 weeks ago, translation, In English,

Hello Codeforces!

Codeforces Round #608 (Div. 2) will be held on Dec/15/2019 12:15 (Moscow time). The round will be rated for Div. 2 contestants. There will be 6 problems for 2 hours. Please, notice that the start time is unusual.

The round will be rated for the participants with rating lower than 2100. The statements will be available in Russian and English.

The round coincides with (and is based on) a local Saratov's olympiad for high school students. That's why we ask the participants of the olympiad to stay silent and don't share the statements of the contest with anyone. Unfortunately, we cannot add all the problems to the round, it will contain only six problems.

The problems were proposed and prepared by Alexander fcspartakm Frolov, Adilbek adedalic Dalabaev, Vladimir Vovuh Petrov and me.

We also would like to express our gratitude to Mike MikeMirzayanov Mirzayanov for the permission to make a mirror and Codeforces and Polygon platforms, to our coordinator Dmitry _kun_ Sayutin or his help with testing the problems and preparing the round, and to the team of testers: MrPaul_TUser, Stresshoover, Supermagzzz, artsin666, defolaut, Peinot, PrianishnikovaRina, sladkayaKlubnichka, Ivan19981305, lankin.i, Pavlova, Decibit, dmitrii.krasnihin, AlexSap, unreal.eugene.

Scoring distribution: 500 — 1000 — 1250 — 1750 — 2250 — 3000.

Good luck!

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By kevinsogo, history, 6 weeks ago, In English,

Hello, Codeforces community!

I'm glad to invite you to Codeforces Round #607 (Div. 1) and Codeforces Round #607 (Div. 2), which will be held on 15.12.2019 08:05 (Московское время). The round will be rated for both divisions.

The problems were taken (mostly) from the 2019 ICPC Asia-Manila Regional Contest that's happening at the same time. Thus, they have been prepared by various setters and testers from the Philippines: myself (kevinsogo), Kyle See (kylesky), Payton Yao (noobcake), Tim Dumol (timd), Guissmo Asuncion (guissmo in HackerRank) and Marte Soliza (myrtactle in TopCoder).

Since the problems are based on the ICPC Manila regionals, we request all the coaches onsite to refrain from making the problem set public. We also request the coaches and everyone else who has seen the problems (or part of it) to refrain from joining this round.

A huge thanks to isaf27 for coordinating and helping me set up this round. Thanks to 300iq for some testing. Of course, thanks as well to MikeMirzayanov for providing us Codeforces and Polygon. These are great gifts to the competitive programming community! Also, thanks for the opportunity to use our problem set for a CF round.

You will be given 6 problems in both divisions and 2 hours to solve them. I recommend reading all the problems; they were written by talented writers from the judging team.

Good luck, have fun, and I wish everyone high ratings!

The scoring distribution will be announced closer to the beginning of the round.

Update: The scoring will be as follows:

Div.2: 500 — 1250 — 1500 — 2000 — 2500 — 3000
Div.1: 500 — 1000 — 1500 — 1750 — 2250 — 3000

Good luck and have fun!

Update: The editorial is up: Click here.

Congratulations to the winners! Congratulations to ksun48 for winning the Div. 1 round, and ilovebinhh for winning the Div. 2 round!

Div. 1 Winners:

  1. ksun48
  2. Um_nik
  3. ecnerwala
  4. peehs_moorhsum
  5. Radewoosh

Div. 2 Winners:

  1. ilovebinhh
  2. Rikuki
  3. Owen_codeisking
  4. ly_61
  5. p6pou

I hope you enjoyed the problems! Thanks to the onsite teams and coaches who gave feedback; I'm glad the reception was positive.

I am planning on releasing the full, untouched ICPC Manila 2019 problem set in the gym sometime in the future, so you can see which problems you missed. The Intergalactic Sliding Puzzle is not the hardest problem in the round!

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By MikeMirzayanov, 6 weeks ago, translation, In English,

This weekend, on Dec/14/2019 14:05 (Moscow time) we will hold Codeforces Round 606. It is based on problems of Technocup 2020 Elimination Round 4 that will be held at the same time.

Technocup is a major olympiad for Russian-speaking high-school students, so if you fit into this category, please register at Technocup 2020 website and take part in Technocup 2020 - Elimination Round 4.

Problem authors are me, Endagorion and voidmax. Many thanks to the testers: Kostroma, grumpy_gordon, Supermagzzz, AdvancerMan, Stepavly, unreal.eugene, cannor147 and geranazavr555!

Div. 1 and Div.2 editions are open and rated for everyone. As usual, the statements will be provided in English and in Russian. Register and enjoy the contests!

Good luck on the round
MikeMirzayanov

UPD 1: The scoring:

  • D1: 500-1000-1250-2000-2250-3000
  • D2: 500-1000-1500-1500-2000-2500

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