Hi!

This round is sponsored by esports team cybercats. The team was founded in October 2021 by me and subscriber.

We currently have a Dota 2 roster, playing in the second division of EEU DPC. Come support us on streams and in the comments!

As a thank you to Codeforces and the competitive programming community, we decided to make this round and give away 100 plush cybercats!

The prizes will be awarded to the first 100 places in the round.

Follow our social networks:

   (RU) VK    (RU) telegram    (RU) youtube    (EN) twitter.

The problem set was prepared by subscriber, isaf27, KAN, Catmoonlight, jdurie and BucketPotato.

Round was tested by enot110, izban, qwerty787788, MateoCV, ilyakrasnovv, blobugh, ak2006, Valters07, DiegoGarcia, Chaska, kzyKT, Dan4Life, FedeNQ, alysonNBS, petertromso and jojonicho.

UPD. Scoring distribution: 500 — 1000 — 1500 — (1500 — 750) — 2250 — 2500 — 3000 — 3500.

UPD. editorial

Hi,

Today, team of three ACM ICPC World Champions (enot110, izban, -XraY-) and two WCPS coaches (Aksenov239 и GShark) will throw games in Dota 2 and everything will be live on twitch!

When: start approximately 21-22 MSK, have plans to play all night (or until we are exhausted)

Stream here: https://www.twitch.tv/enot110

We will mostly speak russian (since in-game communications are very important), but will answer any english questions written in chat! Don't forget to use tag @enot110, so this messages will be highlighted for us and we will answer quickier on them

P. S. don't expect high-skill plays from us, but we will crush 2k mmr pubs

Tired of going through 30+ pages of standings on atcoder in attemps to find someone by their handle?

There is no "search by handle" function at atcoder?

You miss "friends" feature at atcoder?

Here is a LIFEHACK, how you can find someone in standings easily!

Steps:

1. Open random page with standings
2. Press Ctrl+U in chrome (or some other hotkey to view source code of the page)
3. Now you have a full rating! Just press Ctrl+F (again, in chrome) and look for your friend!
4. Profit! Now just go and upvote this post

Hello, Codeforces!

I would like to invite you to participate in a new csacademy contest. Round #9 will take place on Tuesday, July/26/2016 16:00 (UTC). I will be one of the problem setters of these round, together with mgch and the CSA team. This round will also feature some money prizes, as follows:

• First place: 125$
• Second place: 100$
• Third place: 75$
• Fourth and fifth place: 50$
• Two more special prizes, each consisting of 50$. The criteria for the special prizes is not chosen yet, but we will make it public after the contest.

This round will also feature problem statements in Russian. Many thanks to Yury_Bandarchuk for doing all the translation work!

Contest format:

• You will have to solve 7 tasks in 2 hours and 30 minutes.
• There will be full feedback throughout the entire contest.
• Tasks will not have partial scoring, so you need to pass all test cases for a solution to count (ACM-ICPC-style).
• Tasks will have dynamic scores. According to the number of users that solve a problem the score will vary between 100 and 1000.
• Besides the score, each user will also get a penalty that is going to be used as a tie breaker.

About the penalty system:

• Computed using the following formula: the minute of the last accepted solution + the penalty for each solved task. The penalty for a solved task is equal to log2 (no_of_submissions) * 5.
• Solutions that don't compile or don't pass the example test cases are ignored.
• Once you solve a task you can still resubmit. All the following solutions will be ignored for both the score and the penalty.

The CSA team still recommends using an updated version of Google Chrome. If you find any bugs please email them at contact@csacademy.com

Looks like noone has already done this. Here is top100 of the most popular users on the codeforces.

(the list contains only users from top200 by rating or top200 by contribution)

I just wanna point out the problem, that these two contests (codeforces round 325 and topcoder srm 670) will be at Saturday at the same time.

Hi!

Today I'm proud to announce that I'm starting regular streams on twitch. On these streams I'm going to solve timus tasks (maybe other archives later) as a part of my trainings. Of course, I'll try to comment what I'm doing.

To give it even more action, I'm introducing to you challenges. Pick your favorite(or maybe not) problem on timus with at least 1000 authors and write its ID to the chat. If you are lucky, I'll pick your problem. If I get AC in 30 minutes -- I win(nothing happens), otherwise you win and I'll do 10 push ups =) (at least, I'll get in shape)

The first stream starts today at 20:00 MSK and lasts till sleepy time.

I'll try to comment in english. Unfortunately, my english is bad, it's not my native language. If I face a lot of troubles with this, I'll switch to russian.

The link to the stream.

Stay tuned!

UPD. Thanks guys, that was really amazing. The second stream is gonna be today at the same time (20:00 MSK)

During 5,5 hours I've solved 20 problems and haven't solved another 2 (failed on 1004 and 1873). So the current score is 20:2. So I've already done 20 push ups =) Come on guys, there are a lot of not-easy problems among problems with at least 1000 authors! I'll think about reducing the limit of 1000 authors, but let's try one more time.

I've uploaded screencast from the first stream on youtube. But the screencast misses the very important part of the stream -- the chat. So it's much better to watch the stream live than as an offline record.

Also, don't forget to follow my channel on twitch to be able to get notifications when the stream starts. Good luck!

UPD 2. Looks like, this challenge system was boring enough, so as my stream (I have lost only 4 times). So, I am introducing to you the new system. Now, you can choose problem on timus with at least {balance} authors. What's the balance? By the start of the stream it's 800. If I win challenge it decreases by 50 authors. If I lose it increases by 50 authors. So, now it's almost impossible to see the score 10-1 at my stream.

Today's stream will be at 22:30 MSK. Come!

UPD 3. 25-06-2015 For those, who are not sleeping at night, or just at the other end of the world, stream starts in 20 minutes!!
At 03:50 MSK

UPD 4. 01-07-2015 Today is the stream day. Stream starts at 23:00 MSK

UPD 5. 02-07-2015 Exclusive stream with subscriber!!! Start at 21:45 MSK

UPD 6. 21-07-2015 Streams are back. Start at 00:00 MSK

UPD 7. 19-08-2015 Stream starts at 00:00 MSK . Feel free to prepare some problems with >= 400 authors =)

UPD 8. 01-10-2015 STREAM!! Starts at 00:00 MSK.

UPD 9. 08-10-2015 Streaming mathfights with commentary. Starts at 20:00 MSK.