Hi, everyone!

Tomorrow, on September 18, 2016, at 12-00 the Final Round of Russian Code Cup 2016 will take place. Top 50 participants of the Elimination Round will take part in the contest and have a chance to win great prizes. The length of the Final Round this year is 2 hours, the Final Round participants will compete online. You can watch the Final Round at http://russiancodecup.ru

Meanwile we are pleased to announce that the Russian Code Cup team together with Codeforces project have prepared a small surprise to all those who didn't manage to get to the Final Round of RCC-2016. After the Final Round ends, at 14-05 Codeforces will host online-contest with RCC-2016 Final Round problems.

The contest will use ACM ICPC rules and will not be rated. Problems will be in English and in Russian. Problems were prepared for Russian Code Cup Final Round, so they are quite difficult, the contest is mostly suitable for Div1 participants. Of course, we would like to ask the Final Round participants do not use the contest for testing their upsolved solutions, please wait until the end of the online contest and use the problem archive.

So, everyone is welcome to watch the Final Round and then to take part in the online-contest! Good luck to everybody!

Hi everyone, it's me again!

Codeforces Round #372 (Div. 1 + Div. 2) will take place on 17 September 2016 at 16:35 MSK,

After my last round, this will be my second round on Codeforces. I believe you'll find the problems interesting and I hope you'll enjoy the round.

This round would not be possible without danilka.pro who improved one of the problems that made this round possible, and also helped in preparing and testing the round. Also, thanks to all the testers, IlyaLos, HellKitsune and phobos and thanks to MikeMirzayanov for the awesome Codeforces and Polygon platforms.

ZS the Coder and Chris the Baboon's trip in Udayland is over. In this round, you'll help ZS the Coder solve the problems he have randomly came up with. Do you have what it takes to solve them all?

The problems are sorted by difficulty but as always it's recommended to read all the problems.

We wish you'll have many solutions and enjoy the problems. :)

As usual, the scoring will be published right before the contest.

UPD : There will be 5 problems in both division as usual.

Scoring :

Div. 2 : 500 — 1000 — 1500 — 2000 — 2500

Div. 1 : 500 — 1000 — 1500 — 2500 — 2750

Good luck and I hope you enjoy the problems!

UPD : Contest is over. I hope you enjoyed the contest and problems :) I'm sure some of you wants to see the editorial now, so here it is while we wait for System Test to start.

UPD : System tests is over. Here're the winners :

Division 1 :

1. jqdai0815

2. matthew99

3. jerry

4. Burunduk1

5. JoeyWheeler

6. LHiC

7. SanSiroWaltz

8. dotorya

9. Arterm

10. zeliboba

Division 2 :

1. amethyst0

2. JOHNKRAM

3. huzzah

4. Vax

5. KyleChen

6. LeiQ

7. Tomer.Adar

8. creatnx

9. OrangePlus

10. Yukikaze

Congratulations to them!

Welcome to 2016-2017 CT S03E02: Codeforces Trainings Season 3 Episode 2 - 2004-2005 Open Cup, Volga Grand Prix. The training duration is 4.30 hours. It is opened for teams as well as for individual participants. After the end you may use the practice mode to complete problem solving. Also it will be availible as a virtual contest for whose of you who can't take part today. Please, do not cheat. Only fair play!

We are planning to start on September, 14, 2016 13:10 (UTC).

It is possible that the problems will be too easy for some participants, it is possible that we will add some problems.

Good luck!

Hi everybody!

Codeforces Round #371 takes place on 13 September at 19:35 MSK for the both divisions. This is our first round and we hope it won't the last one.

This round is prepared by me (Anton Tsypko) and Sonechko (Sofia Melnyk). We want to say thanks to GlebsHP (Gleb Evstropov) and Sereja (Sergey Nagin) for help with preparation of this round, MikeMirzayanov (Mike Mirzayanov) for Codeforces and Polygon systems, iSlava (Viacheslav Ocheretnyi), AllCatsAreBeautiful (Mark Mikhno), BigBag (Matvey Aslandukov), winger (Vladislav Isenbaev) and AlexFetisov (Alex Fetisov) for testing problems.

It's recommended for both divisions to read the Interactive Problems Guide before the round. Scoring distribution will be published right before the start of the contest.

Good luck!

Scoring:

Div 2: 500 — 1000 — 1000 — 2000 — 3000

Div 1: 500 — 1000 — 2000 — 2000 — 2000

Upd: Congratulations to the winners:

Div 1:

1. geniucos
2. Herzu
3. Endagorion
4. Um_nik
5. Radewoosh

Div 2:

1. fanache99
2. amethyst0
3. Gromah
4. serlis
5. Jason_zjj3

Editorial.

UPD: We are sorry that Div 1 C is very similar to this, but the contest will be rated.

In the very beginning of this post I would like to thank everyone who contributed to make this contest happen — both onsite and online versions. Thanks a lot to GlebsHP for helping to organize mirror on Codeforces.

Last year there were 4 teams that solved all the problems before contest ended so we tried to make this year's problems a bit harder. I would also like to mention that 2042 teams registered to this contest,676 managed to solve at least one problem and there is 1 teams that solved all the problems before contest ended. Congratulations to everybody!

Congratulations to tourist and VArtem for winning this competition!

Ok, so here is top 10 of Codeforces version of Bubble cup:

Hi Codeforces!

We strike back from last year to held Bubble Cup again — programming competition organized by Microsoft Development Center Serbia for last nine years in a row. And this year's final is on this weekend!

Due to last year's successful experience we decided to organize a mirror of this final on Codeforces again. We would like to thank MikeMirzayanov and Codeforces for this great platform and their help. Competition will start at 11-th of September at 11 AM 12:00 (Moscow time). Contest will last for 5 hours and will go by ACM ICPC rules. It will be a competition for teams of 1-3 members. There will be 9 problems.

Contest was mainly prepared by employees of MDCS, knightL and Milanin. Additional thanks to bayleef and vitar for their help in testing.

This contest will be unrated (mostly because rules of this contest and not usual for Codeforces and it is still a mirror of onsite competition).

10 best teams will get T-shirts (each member get one), +10 T-shirts will be distributed randomly to competitors from top 100.

Please pay attention to that contest will start at 12:00 (by Moscow time)

Hi everyone. I'm trashfirstsearch, and I used to be blue...

Anyways, Codeforces Round #370 (Div. 2) will take place on 10 September 2016 at 19:35 MSK. As usual, Div.1 participants can join out of competition.

Much thanks to GlebsHP for helping me with preparing the contest, MikeMirzayanov for the Codeforces and Polygon platforms, and minimario and Wrong_Answer_Exceeded for testing problems.

This will be my first contest prepared on Codeforces, and I have prepared all the problems with the intent of making them interesting for everyone. It is, as usual, strongly advised to read all the problems.

Good luck, and I hope you will gain rating(and force someone else to lose it >:) ).

Update: Congratulations to the winners:

Div.1

1. KrK

2. halyavin

3. fhlasek

4. vintage_Vlad_Makeev

5. Kmcode

Div.2

1. __0v0__

2. palayutm

3. Strikeskids

4. khanh.tang

5. pkq2010

Here is the editorial.

I sincerely apologize for the problems during the contest. However, I hope everyone found the problems interesting! Thanks to everyone who participated and helped with the problems!

Welcome to 2016-2017 CT S03E01: Codeforces Trainings Season 3 Episode 1 - 2010 Benelux Algorithm Programming Contest (BAPC 10). The training duration is 4.30 hours. It is opened for teams as well as for individual participants. After the end you may use the practice mode to complete problem solving. Also it will be availible as a virtual contest for whose of you who can't take part today. Please, do not cheat. Only fair play!

It is possible that the problems will be too easy for some participants, it is possible that we will add some problems.

Good luck!

The new season of a collegiate team championship ACM-ICPC is about to start. For example, the registration for the Southern (Saratov) Subregional Contest is already running. I am sure that many participants of the Codeforces rounds will take part in ACM-ICPC this year.

We are launching a series of weekly practice trainings on Codeforces. Naturally, they will be held within Codeforces::Gym. Feel free to participate!

The practice starts on Wednesdays at about 13:10 PM (UTC), which is 16:10 Moscow Time. Expected duration is 4-5 hours. We are going to practice using the problems of different contests of the past years. All you need is common sense and observing these simple rules:

• We will not publish the problem source before the practice starts. We want you to solve the problems on your own in a fair competition. If you use somebody else’s code or cheat in any other way, you will be disqualified. If you don’t want to solve on your own, that’s fine, you don’t have to. But spoiling the practice for others is unacceptable.
• Do not discuss the problems till the practice ends.
• We will rarely answer the questions about problems. If you’ve found some obvious bug, please let me know. We will fix the bug and send everybody the note about the fix.
• If you have a coach account (and you do not participate in the practice), we will be grateful for your help.
• Please register for the practice with the people from your team who actually participates in it.
• From time to time, I am going to ask some of the jury of the past contests or coaches from other higher educational institutions to help with preparing or share materials — your understanding and help will be greatly appreciated!
• if you solved the contest problems before just switch to another training or inform us via problem questions form, we will move you to out-of-competition role.

The first contest 2016-2017 CT S03E01: Codeforces Trainings Season 3 Episode 1 - 2010 Benelux Algorithm Programming Contest (BAPC 10) takes place on September, 7, at about 13:10 (UTC).