Hi Codeforces!

I am glad to announce and invite you to Codeforces Round 689 (Div. 2, based on Zed Code Competition), which will be held on Dec/11/2020 17:35 (Moscow time).

We want to offer you to solve 6 problems taken from the Zed Code Competition 2020, which was held as part of the Adapt by Zed conference powered by EPAM Systems.

This round will be rated for the participants with rating lower than 2100.

• The authors of the round are: Aliaksandr AleXman111 Kryvasheyeu, Aliaksandr sdryapko Drapko, Aliaksei netman Vistiazh and me.
• The round was coordinated by Vladimir vovuh Petrov and Nikolay KAN Kalinin.
• The round was tested by: awoo, mohammedehab2002, thenymphsofdelphi, _overrated_, BRCode, morzer, Retired_cherry, mesanu, SlavicG, Shinchan01, manik.jain, Coder-HVZ, Rox, hloya_ygrt, 244mhq, Wind_Eagle, PuRpLe_FoReVeR, Gassa, namanbansal013, saurabhyadavz and andrew.
• And, of course, thank you very much Mike MikeMirzayanov Mirzayanov for creating the polygon and codeforces platforms.

Thanks a lot for your contribution to the preparation of the round! Good luck with the competition!

UPD: The scoring distribution is 500 — 1000 — 1250 — 1500 — 2250 — 2750.

Congratulations to the winners of div 2:

1. yash_daga
2. AiriKatagiri
3. tejas10p
4. RNG-Ming
5. meidong

as well as div 1 winners:

1. neal
2. Geothermal
3. LayCurse
4. emthrm
5. hank55663

Thank you all for participating! (editorial)

Author: aropan

author's solution: 96602393

Author: AleXman111

author's solution: 96598752

Author: AleXman111

author's solution: 96598711

Author: hloya_ygrt

author's solution: 96727317

Author: andrew

author's solution: 96601544

Author: hloya_ygrt

author's solution: 96727345

P.S. We will add our own solutions soon

Hi Codeforces!

I am glad to announce and invite you to Codeforces Round 678 (Div. 2), which will be held on Oct/24/2020 17:05 (Moscow time). A couple of weeks ago, we held Codeforces Round 675 (Div. 2) based on the tasks of the [contest:297213], and this time we want to offer you to solve the best 5-6 problems of the finals.

Please note the unusual start time of the round. This round will be rated for the participants with rating lower than 2100.

This is the second year that Andersen has been holding the competition, which is primarily intended to support students of regional Universities in Belarus and Ukraine (starting this year). This year, 60 students from regional universities in Belarus and Ukraine will take part in the finals of the competition.

• The authors of the round are: Aleksey aropan Ropan, Yuri hloya_ygrt Shilyaev, Andrei andrew Mishchanka, Alexander AleXman111 Krivosheev and me.
• The round was coordinated by Nikolay KAN Kalinin and Ildar 300iq Gainullin.
• The round was tested by: Boris PuRpLe_FoReVeR Serenkov, Yahor 244mhq Dubovik, cckk4467 and rafaelgo.
• And, of course, thank you very much Mike MikeMirzayanov Mirzayanov for creating the polygon and codeforces platforms.

Thanks a lot for your contribution to the preparation of the round!

Good luck to everyone in the upcoming competition! :)

UPD: The editorial was posted.

Congratulations to the winners of div 2:

1. kuticpcer
2. SevenDawns
3. Clix
4. iamgqr
5. rishant_m

as well as div 1 winners:

1. jiangly
2. dorijanlendvaj
3. vepifanov
4. krijgertje
5. darkkcyan

Thank you all for participating!

Greetings to all belarusians who actively, or not so actively, participate in this amazing community we have on Codeforces.

I would like to ensure that we have your support to initiate changing the flag of Belarus on this website to the historical white-red-white flag, since the current official flag of Belarus has become strongly associated with crimes against humanity, with the brutality, torture, ferocity and human rights abuses which have, sadly, become commonplace in the past few months in our beautiful country.

Outside of public forums, in closed community member chats there is a consensus on the fact that belarusians should have the ability to perform under a different flag by either letting them individually choose which flag they prefer or by changing the existing flag to the one suggested above.

Some platforms have already gone through with similar changes, for example one of the largest russian-language sport website sports.ru or a very popular chess website chess.com.

But no such change has a right to be performed without wide support from the people who will be affected by it.

This is why I'm asking every belarusian to express their opinion on the topic in the comment section of this post.

(Idea author: Vladik, author of the text: sdryapko)

Hello to everyone!

It’s not the first time I’ve noticed comments such as this one:

However everything remains as it is. There is no visible reaction to such problems. Perhaps the administration has no time to read all the comments. But in that case there should be a place in which everyone would be able to throw off reports about bugs. Unfortunately there is not such a place.

At least three people suffered from this problem at the last codeforces round:

I hope someone from administration will notice this post.

Hello everyone!

27 May, 12:35 MSK new codeforces round takes place for participants from the second division. Participants from the first division can participate out of competition. Round consists from 5 problems, and you will be given 2 hours to solve them. Pay attention on round start time.

The problems will be almost the same as on Open Olympiad of Mozyr State Pedagogical University, which takes part parallel to the round. The full problem set would be in codeforces gym soon. I am also going to tell you about the Olympiad a bit later.

• The problemsetters are: me (Vladislav Vishnevski), Valery Kameko (v4lerich) and Yury Shilyaev (hloya_ygrt).
• The testers are: Alex Kernozhitsky (gepardo), Arseniy Kolosov (KArs) and Ilya Klimko (klinchuh).
• The coordinator of the round was Alexey Vistyazh (netman).
• Alex Dryapko was reading the statements (sdryapko).
• And of course, the round would be impossible without Mike Mirzayanov (MikeMirzayanov), author of polygon and codeforces systems.

Thanks everyone for contribution you did to the setting of the round.

The main character of the round is Vladik, who loves to solve problems and himself.

Good luck to everyone! :)

UPD 500-1000-1500-2000-2500

UPD Editorial.

Hi there!

Codeforces round #394 for the second division will take place at the time of Tuesday, 31 January 17:35 MSK. Participants from the first division can compete out of competition. Contestants will have 2 hours and 6 problems to solve.

• Problems were developed by me (Vladislav Vishnevki) and Denis Anischenko (altruist).
• Alexey Vistyazh (netman) helped us as a contest coordinator.
• Aliaksandr Drapko (sdryapko) and Alena Yaros were reading the statements carefully.
• Vlad Khala (haposiwe) tested the round.
• Olya Yakovchik drew amazing illustrations for the problems.
• Yuri Shilyaev (hloya_ygrt) translated editorials and round announcement for you.
• And of course the round couldn't happen without (MikeMirzayanov), the author of platform polygon and codeforces, and also author of the idea to one of our problems.

Thanks everyone listed for the contribution you made to the contest preparation!

The main character of the legends is tiger Dasha, which loves to solve puzzles and make origami figures.

Good luck everyone! :)

UPD Round will consist of 6 problems.

UPD 500-1000-1500-2000-2500-3000

UPD Contest finished. It was decided to make round unrated, because codeforces is unstable now. I am really sad about that :( I hope everyone found a problem he liked. Editorial will be posted soon.

UPD Top 10 participants from second division: 1. DefinitelyNotGreenGrape
2. udwztb804
3. Inhibitor
4. Border_Collie
5. HanwhaEagles
6. Vergara
7. zelta
8. GGOSinon
9. P_Nyagolov
10. tonykky

Top 10 participants from first division: 1. eddy1021
2. Myungwoo
3. dreamoon_love_AA
4. natsugiri
5. Shik

Congratulations to the winners!

UPD Editorial.

Good day to everybody!

The next round for the participants of the second division will be held at September 22, 2015 at 19:30 MSK. Traditionally, the members of the first division may take part in the contest out of competition.

I (Vladislav Vishnevski) and igdor99(Igor Doroshev) are the authors of the round. We would like to please Zlobober (Maxim Akhmedov) for the assistance in the preparation of tasks, Delinur(Maria Belova) for translating statements into English, MikeMirzayanov(Mike Mirzayanov) for remarkable systems Codeforces and Polygon, as well as our friends daksenik(Dmitry Aksenik) and irevt(Ivan Revt) for their assistance in the round preparation. This is our first round, and, we hope, it won't be the last one!

You will be proposed 5 tasks and 2 hours for their solution.

The protagonist of the round is the parrot Kefa, who likes money and restaurants.

Good luck and high rating!

UPD: The scores — 750-1250-1500-2000-2500.

UPD: Editorial!