Hi,

Codeforces Round #282 will be held at 13th of December, 19:30 MSK. Please don't note anything since the time is the usual time of contests.

The round is prepared by FarbodY, Haghani and Me(matrix).

We'd like to thank Zlobober who helped us a LOT for preparing the problems, MikeMirzayanov for the Polygon and Codeforces platforms and Delinur for helping us in preparing statements and translating them.

Our special thanks goes to mruxim for testing the round.

The problems will be sorted according to the estimated order of difficulty according to our opinion but we strongly recommend you to read all of the problems.

As always the update regarding score distribution will be posted just before the round starts. :)

UPD: It was written that contest starts at 20:00 MSK. it was a mistake and is fixed now. The round starts at usual time 19:30 MSK.

UPD2: We also thank niyaznigmatul for testing our round.

UPD3: Score distribution:

Div1: 500-1000-1750-1750-2500

Div2: 500-1000-1500-2000-2750

As you might have noticed, the scores can now be multiples of 250 as well. Let's thank Codeforces team for adding this feature!

Good luck and Have fun!

UPD4: Congratulations to the winners of both divisions:

Div1:

1. tourist
2. winger
3. sankear
4. uwi
5. Egor

Div2:

1. Ginger88895
2. pwild
3. arthurpd
4. konmaj
5. ezkatka

The editorial for all problems except D and E Div1 are ready and can be found here. It'll be completed soon.

We thank you all for participating and hope you had a good time.

UPD5: The editorial is now complete and can be found here.

Hi!

On 3rd December, 18:00 at Moscow will be Codeforces Round #281 (Div. 2). As usual Div. 1 contestants can take part out of contest.

This is my first Codeforces Round and I hope that this isn't the last one :)

Thanks to Maksim Akhmedov (Zlobober) for the help in making contest and MikeMirzayanov for Codeforces and Polygon platforms.

UPD1: The scoring will be dynamic.

UPD2: Contest is over. Thank to all participants. I hope you liked my contest.

UPD3: Editorial

UPD4 Top-5 contestants, congrats

1. ShiXingxing15

2. ganar27

3. Tim_LinYd

4. coolwyj

5. gaoyihan

Also congrats to gaoyihan, who solved problem E.

UPD5 Hack stats by kostka.

Greetings to the Codeforces community!

Regular Codeforces round #280 for participants from the second division will take place on 1 December, 19:30 MSK. Participants from the first division are able to participate out of the contest.

It is my first round on Codeforces. Hope you will enjoy this round.

I 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 great Codeforces and Polygon systems.

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

UPD: Scoring is standard — 500-1000-1500-2000-2500.

UPD: Thanks to everyone, who participated in the round!

Congratulations to the winners:

1.alex_y

2.wingemerald

3.Eric94

4.Zpw987

5.rabbit_TR

standings

UPD: Editorial is here.

Welcome to 2014-2015 CT S02E11: Codeforces Trainings Season 2 Episode 11 (2011-2012 ACM-ICPC Latin American Regional Contest + Extended). The training duration is 5 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!

Hi everybody!

Today at 12:00 Moscow Time there will be Codeforces Round #279, dedicated for second division contestants. Round is based on the problems of the Saratov second round of All-Russian School Olympiad in Informatics 2014-2015 that is held at the same time in Saratov.

This round was brought to you by ikar, HolkinPV, IlyaLos, fcspartakm that are all members and ex-members of Saratov SU 2 team.

There will be 6 tasks for 2 hours 30 minutes. Scoring will be announced just before the round starts.

Round will be rated for second divison participants. First division contestants may participate out of competition.

UPD: Scoring: 500-1000-1500-2000-2000-2500.

Good luck!

Hello, Codeforces!

Codeforces Round #278 will be held at Nov/21/2014 20:00 MSK for both divisions. Note that the time is 30 minutes later than regular Codeforces time, and Moscow is currently UTC+3.

The problem setters are taorunz and me. This is our first Codeforces round!

We'd like to thank Maxim Akhmedov (Zlobober), who helped us prepare the problems very much; also to thank MikeMirzayanov for Codeforces and Polygon platforms.

This round is involved in MIPT Fall Programming Training Camp, and top-20 of contestants from the camp will be rewarded with Codeforces T-shirts. For other contestants it will be regular Codeforces round.

Hope you enjoy the round, and wish you high rating.

UPD: Score distribution:

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

Div. 1: 500 — 1500 — 1500 — 2000 — 2500

It's not for everyone that the optimal strategy is solving tasks in order. Make sure you've read all problems before the contest ends.

UPD: Very sorry that the round will be moved 20 forward due to technical reasons.

UPD: Top 5 participants:

Div.1

1. ACRush
2. rng_58
3. Egor
4. Kostroma
5. sankear

Div.2

1. nghiand
2. rabbit_TR
3. mwc123
4. batkhuyag
5. whalyzh

Honorable mentioned:

anta, who solved Div.1 E!

CKYang, who solved Div.2 E!

UPD: Editorial is here!

UPD: hack statistics (Div.1 and Div.2) by kostka!

It is not visible from user point of view, but we've introduced some changes in Codeforces backend to improve system performance. And now we want to test the system before Round 278.

I invite you to take part in Testing Round 11. It will start soon, on November, 20 21:30:00 (UTC). It will be unofficial unrated round.

Pretests are unusually weak to trigger more hack.

If you see any unexpected behavior or bugs, please inform us via comments.

Thanks.

UPD.: Thank you for participation.

Welcome to 2014-2015 CT S02E10: Codeforces Trainings Season 2 Episode 10 - 2014 Amirkabir University of Technology Annual Programming Contest (AUT APC 14). The training duration is 5 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!