Hello everyone.

Soon, On the night after the Halloween, there will be a Codeforces gym contest, named Crypto cup 1.0.

Like its name, it's a cryptography contest and for all problems, you are given some sample encryptions encrypted using a certain algorithm and you have to write a program to decrypt the given messages.

There will be 18 problems and you have 6:30 hours to solve them. I hope it will be interesting.

Problems are prepared by me (PrinceOfPersia) and tested by Damon also thanks HosseinYousefi for editing problem statements.

For practicing cryptography, we recommend SecutiryOverRide's cryptography challenges.

Also, this round needs a little Algorithm and CS knowledge.Don't forget to pay attention to problem's titles, they might be helpful ;)

Currently, problems are being prepared, so you're unable to see the contest in gym contest list yet.

Problems are in decreasing order of difficulty.

UPD: Duration has been increased by half an hour, now it's 6:30 .

UPD2: Please note that contest will be held on November 1st, because it had overlap with Shahid Beheshti University ACM.

UPD3: Now it's in the Gym contests list.

UPD4: Registration is open.

UPD5: Contest is over.

I hope you enjoyed the problems.

Congratulation to the winners who solved all the problems :

1. I_love_Hoang_Yen

2. Team Flareon : Localhost, DiEvAl, Visconte

3. kennethsnow

4. niklasb

5. 135678942570

Complete standing

Be aware, our standard rounds are coming... ;)

Welcome to 2014-2015 CT S02E07: Codeforces Trainings Season 2 Episode 7. 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!

And the winners are:

(Participants Qualified for the Final Round of Bayan Programming Contest 2015)

• If you are a t-shirt winner, double check your information on your Bayan Contest Profile.
• T-shirts will be sent after the final event which is going to be on early 2015.
• We might invite one of the t-shirt winners as our event blogger to the onsite final.
• Finalists will receive invitation emails and will be asked to send us a copy of their passport. The invitation letter will be send from "contest at bayan.co.ir".
• Unfortunately we found some cheaters and also people with duplicated accounts. As mentioned before they will be banned for ever from Bayan Programming Contests.
• To view the Source codes, log in to contest.bayan.ir, select the round and on the scoreboard click on the score for each problem.
• T-shirt Winners of Bayan Programming Contest 2014-2015
• High ranked countries in top 50
• High ranked countries in top 100

We gladly invite you to participate in the Three Subregionals Cup 2014 – a team-based online programming competition parallel to the ACM ICPC Subregionals in Moscow, Minsk and Saint Petersburg. The tournament will be organized by the team of Yandex.Contest and the jury of the Subregionals. The online rounds will be held on the Yandex.Contest system. The dates and start times of subregionals are: Moscow (registration) – October 26th, 11:30 MSK, Minsk – November 6th, 12:00 MSK, Saint Petersburg – November 8th, 12:30 MSK.

Teams that participate in the onsite version of one of the three quarterfinals will be able to participate in the online versions of the other quarterfinals via Yandex.Contest. Teams that don’t participate in any of the three quarterfinals onsite will be able to participate in all of them online via Yandex.Contest. Cumulated results of three subregional contests will be calculated based on Grand Prix 30 scoring system.

You can register for the online rounds at any time. You can represent a single person or create a team using the My teams link. Each invited team member has to confirm his participation in the team. You can choose participation type and team members upon registering for the contest. Note that OpenCup dedicated logins will not work at this contest!

The rules of the online rounds correspond to the onsite quarterfinal's rules.

For your convenience a test contest is available.

UPD Official Moscow QF results

UPD2 Western QF is right around the corner!

UPD3 Northern QF will start tomorrow at 12:30 MSK.

The contest has been moved to the Gym.

Today it will be ACM-ICPC, NEEERC, Southern Subregional Contest! As a head of judges I wish good luck to all the participants!

• standings link: http://contest.sgu.ru/monitor/?id=1

On Saturday (October, 25), 07:00 (UTC) it will be a internet-mirror: 2014-2015 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred). Interesting problems are waiting for you. Judges tried to prepare problems of wide difficulty range: for newcomers and for expirienced teams.

For sure, it will be unrated contest. We recommend you to take part in teams. I think, the contest will be moved to Gym later.

Good luck!

MikeMirzayanov, head of judges.

P.S. Saratov Views:

Soon (on October 24, 21:00 MSK) you are lucky to participate in Codeforces Round #275 for both divisions. Pay attention to the round begining time!

Problems have been prepared by team Saratov SU #3 with members: Gridnev Vitaly (gridnevvvit), Danil Sagunov (danilka.pro), Roman Kireev (RoKi).

We want to thank Max Akhmedov (Zlobober) for help with preparation of this round, Maria Belova (Delinur) for translation of statements and Mike Mirzayanov (MikeMirzayanov) for marvelous Codeforces and Polygon systems.

Scoring system:

Div1: 500 1500 1500 2000 2500

Dvi2: 500 1000 1500 2500 2500

UPD:

Contest finished, congratulations for winners!

Div1:

1. tourist
2. Petr
3. subscriber
4. uwi
5. PavelKunyavskiy
6. mmaxio
7. Ra16bit

Div2:

1. dickXD
2. meodorewan
3. charlie

Elimination Round will start today, 14:30 (UTC) and only contestants who have passed Qualification Round will be eligible to participate.

Score for each solved problem is calculated based on these values:

• n = No. of accepted submissions
• t = Contestant's submission time
• p = Number of contestant's wrong attempts

To receive the latest news fast, follow us on twitter: @bayan

Update 1: The Elimination round is over, and let's face it: It was far from good!

Yes, we're aware of all the issues, and we know that nothing is more nerve-racking than facing those issues during a competitive contest. So, first thing first, we'd like to sincerely apologize for all the inconveniences caused.

In last hours, we thought that the contest has become too hard, so we made a major wrong decision: omitting a hard problem and adding a simple problem as our first question without enough time. Hint: never make any changes to the problem set in a hurry.

Update 2: Editorial is on the way. Source codes will also be avalible in a few hours.

Update 3: Unfortunately we have found some cheaters. As mentioned before they will be banned for ever from Bayan Programming Contests.

Update 4: The editorial is now available.

Greetings to the Codeforces community!

Yet another Div1+Div2 round will take place this Sunday, 19th of October at 13:00 MSK.

The round is based on the problems of the regional stage of All-Russia team school competition, which will take place at the same time in Saratov. We are aware about the overlapping with Opencup, but we have no option to shift the round, because we are bounded to the local event.

The problems were prepared by HolkinPV, gridnevvvit, danilka.pro, Avalanche, IlyaLos, Fefer_Ivan and me.

Scoring: 500-1000-1500-2000-2500 (both divisions).

UPD: Editorial is published.

Because of the Codeforces Round 273 (Div. 2) the training contest 2014-2015 CT S02E06: Codeforces Trainings Season 2 Episode 6 - 2007 Benelux Algorithm Programming Contest (BAPC 2007) will be moved one day forward.

Hi, everyone!

Regular Codeforces round #273 for participants from the second division will take place on 16 October, 19:30 MSK. Participants from the first division are able to participate out of the contest.

Problem setter: pkhaustov (Khaustov Pavel, Russia, Tomsk, Tomsk Polytechnic University)

Special thanks to Codeforces team and, in particular, Maxim Akhmedov (Zlobober) for help in round preparations and Maria Belova (Delinur) for translations.

Participants will be given five problems and two hours to solve this problems.

Points distribution: 500-1000-1500-2000-2500

UPD: +10 minutes to start

Good luck!