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About Unrated Educational Codeforces Round 121
By MikeMirzayanov​, 3 days ago,

Hello, Codeforces.
Unfortunately, we have to declare the round unrated.
Absolutely, these are not issues of the side of Codeforces code, but rather it is a hardware issue. Probably, electricity, power unit or something else. This led to unexpected repeated reboots of the server with the database. I hope that we will be able to quickly deal with this.
We apologize to the writers of the round and its participants.
P.S. Please, do not downvote the round announcement: the writers are not to blame for what happened. And in general, this time it is difficult to blame someone. Sometimes hardware fails.
Mike.
Read more »
unrated
 
 
 
 
+1382
MikeMirzayanov
3 days ago
109
Educational Codeforces Round 121 [Rated for Div. 2]
By awoo, history, 5 days ago, translation,

Hello Codeforces!
On Sunday, January 16, 2022 at 06:35UTC-8 Educational Codeforces Round 121 (Rated for Div. 2) will start.
Series of Educational Rounds continue being held as Harbour.Space University initiative! You can read the details about the cooperation between Harbour.Space University and Codeforces in the blog post.
This round will be rated for the participants with rating lower than 2100. It will be held on extended ICPC rules. The penalty for each incorrect submission until the submission with a full solution is 10 minutes. After the end of the contest you will have 12 hours to hack any solution you want. You will have access to copy any solution and test it locally.
You will be given 6 or 7 problems and 2 hours to solve them.
The problems were invented and prepared by Adilbek adedalic Dalabaev, Vladimir vovuh Petrov, Ivan BledDest Androsov, Maksim Neon Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.
Good luck to all the participants!
UPD: Unfortunately, the round is unrated. We are sorry for the inconvenience. You can upsolve the problems using the Codeforces archive.
UPD: Editorial is out.
Read more »
Announcement of Educational Codeforces Round 121 (Rated for Div. 2)
 
 
 
 
+1586
awoo
5 days ago
257
Codeforces Round #766 (Div. 2)
By manish.17, 7 days ago,

omg hi Codeforces!
ScarletS, flamestorm, fishy15, saarang, lookcook and I are glad to invite you to our Codeforces round, Codeforces Round #766 (Div. 2), which will be held on Saturday, January 15, 2022 at 06:35UTC-8. This round will be rated for participants with rating lower than 2100.
We would like to thank:
You will have 2 hours to work on (and solve!) 6 problems. There will be at most five hundred interactive problems in the round. Make sure to read this blog and familiarize yourself with these types of problems before the round! You are highly encouraged to read all the problems ;).
Good luck, and see you on the scoreboard!
UPD1: Thanks to the testers ak2006 for making video editorials for most of the problems, and namanbansal013 who will be streaming solutions after the round!
UPD2: The score distribution is
500​−​1250​−​1250​−​1750​−​2000​−​2750
500​−​1250​−​1250​−​1750​−​2000​−​2750
.
UPD3: The editorial is available here.
UPD4: Congrats to the winners!
Div. 2:
  1. yxh_loves_lxr
  2. Alan_boyfriend
  3. proton1126
  4. raingirl
  5. yincheng01
Div. 1 + 2:
  1. neal
  2. qazswedx2
  3. hitonanode
  4. Bench0310
  5. m_99
We hope you enjoyed the round. Look forward to our next one!
Read more »
Announcement of Codeforces Round #766 (Div. 2)
766, srk, indian round, contest, surang-fan-club, skribbl-bois
 
 
 
 
+645
manish.17
7 days ago
206
Codeforces Round #765 (Div. 2)
By vilcheuski, 9 days ago, translation,

Hello, Codeforces!
We invite you to Codeforces Round #765 (Div. 2), which will take place in Wednesday, January 12, 2022 at 04:05UTC-8. Note the unusual contest start time. This round will be rated for all the participants whose ratings are lower than 2100.
You will have to solve 5 problems in 2 hours. One of the problems will be divided into easy and hard version. The round is based on the problems from Belarusian Regional olympiad. We kindly ask all Belarusian pupils who participated in this olympiad, to refrain from taking part in this round and discussing the problems publicly before the round ends.
Thanks to everyone who helped to prepare this contest:
The scoring distribution: 500-1000-1500-2000-(2000+1250)
Good luck to everyone!
UPD: Finally the editorial is available.
Read more »
Announcement of Codeforces Round #765 (Div. 2)
 
 
 
 
+284
vilcheuski
9 days ago
288
Codeforces Round #764 (Div. 3)
By Aris, 2 weeks ago,

Hello! Codeforces Round #764 (Div. 3) will start at Monday, January 10, 2022 at 06:35UTC-8. You will be offered 7-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially.
The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks.
You will be given 7-8 problems and 2 hours and 15 minutes to solve them. One of the problems in this round is interactive. Don't forget to read the guide on interactive problems.
Note that the penalty for the wrong submission in this round is 10 minutes.
Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:
Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.
Thanks to MikeMirzayanov for the platform, help with ideas for problems and for coordination of our work. Problems have been created and written by ITMO University team: MikeMirzayanov​, MisterGu, myav, Gol_D, Aris, SixtyWithoutExam and Vladosiya.
We would like to thank: itohdak, Yogi79, smtcoder, Ra16bit, Tlatoani, nigus, MrDindows, leaf1415, Kniaz, Alireza, mini4141, Jostic11, BitHashTech, An_yujin, Bugman и sodafago for testing the contest and valuable feedback. List of testers will be updated.
Good luck!
UPD: Here is a photo of our team answering your questions during the round:
UPD 2: Editorial
Read more »
Announcement of Codeforces Round #764 (Div. 3)
codeforces, div3, 764
 
 
 
 
+670
Aris
2 weeks ago
218
I am Mike Mirzayanov. AMA!
By MikeMirzayanov​, 13 days ago,


But why not!
Many people here seem to know me. Or maybe not quite? I am ready to answer your questions. Ask me anything! I plan to spend no more than 3 hours on answers. Sorry if I can't answer all the questions.
Let's more or less follow the rules from here https://www.reddit.com/r/IAmA/wiki/index
Below is actually a quote from the rules.
The interviewee begins the process by starting a post, describing who they are and what they do. Then commenters from across the internet leave questions and can vote on other questions according to which they would like to see answered.
The interviewee can go through and reply to the questions they find interesting and easily see those questions the internet is dying to have the answer to.
Because the internet is asking the questions, they're going to be a mix of serious and lighthearted, and you'll find yourself sharing all kinds of things you won't find in a normal interview.
Comments will be removed under a few circumstances:
Please, don't attempt to bypass the rules by adding a ? to a nonquestion.
Questions must be directed toward the individual(s) doing the IAMA.
Under our policies, astroturfing is the practice of an individual or group of individuals who plant questions in an IAmA post for a particular purpose. This kind of behavior is forbidden.
UPD 1: Oh, I'm kind of tired of doing this. Please keep asking questions. Tomorrow I will answer again. Don't forget to vote for the most interesting ones. I will not have time to answer everything, I will choose something. Thanks!
UPD 2:
Read more »
ama, iama, codeforces, mikemirzayanov
 
 
 
 
+1014
MikeMirzayanov
13 days ago
283
Hello 2022
By IgorI, 3 weeks ago,

Hi, Codeforces! Happy New Year!
I'm glad to invite you to Hello 2022, which will take place on Monday, January 3, 2022 at 06:35UTC-8. You will have
2
2
hours
15
15
minutes to solve the problems. This round is rated for everyone.
All problems are authored by me. I would like to thank 74TrAkToR for excellent round coordination and MikeMirzayanov for great Codeforces and Polygon.
There can be an interactive problem in this round. Don't forget to read the guide on interactive problems.
The scoring is
500​−​1000​−​1500​−​1750​−​2250​−​2750​−​3000​−​3500​−​4500
500​−​1000​−​1500​−​1750​−​2250​−​2750​−​3000​−​3500​−​4500
.
Good luck!
Editorial
Thank you for participation! Congratulations to the winners:
  1. tourist
  2. maroonrk
  3. Radewoosh
  4. Benq
  5. djq_fpc
  6. mnbvmar
  7. ainta
  8. mhq
  9. ecnerwala
  10. Rebelz
Read more »
Announcement of Hello 2022
codeforces round, hello 2022
 
 
 
 
+643
IgorI
3 weeks ago
241
New Year Gift: Codeforces Catalog — Early Access
By MikeMirzayanov​, 3 weeks ago,


Hey!
Are you celebrating the New Year already? I wish you a Happy New Year. I wish you progress, joy and health.
We decided to show the current progress in the catalog of significant Codeforces posts.
So far, quite a bit has been implemented, but somehow you can already use it! Would you like to see it? Follow the link:

Catalog →

As planned, the catalog will collect and classify interesting and useful posts from Codeforces. Indeed, many useful articles have been written in Codeforces over 12 years (God, already 12 years!).
The catalog will be a kind of Codeforces golden fund in the future.
The catalog is a tree of topics to which posts can be added. We will still work on its functionality, for now there are only basic features. Don't be discouraged if something is not supported, which is very necessary — just let me know!
Any red user can enable directory editing. Remember that it is extremely important to make all changes thoughtfully and carefully. The tree should not become infinite in size. You need to have a sense of proportion when detailing topics. Please add only good, useful articles to the directory. If there is a disagreement on the contents of the catalog, the administration will make the final decision.
Hope this will be helpful. And together we can put together a catalog and keep the catalog up to date.
P.S. Many thanks to KAN who helped a lot with suggestions and catalog initial content.
Read more »
codeforces, catalog
 
 
 
 
+1749
MikeMirzayanov
3 weeks ago
92
Invitation to Good Bye 2021: 2022 is NEAR
By 300iq, 3 weeks ago,

Hello Codeforces!
We have a pleasure to invite you to Good Bye 2021, which will take place on Wednesday, December 29, 2021 at 07:35UTC-8. You will have 2 hours to solve the problems. The round will be rated for participants of both divisions.
The problems for this round were prepared by 300iq, with the help of excellent coordinators KAN and 74TrAkToR.
We would like to thank all the testers, who made this round possible: gamegame, thenymphsofdelphi​, ko_osaga, golions, Ashishgup, izban, prabowo, 74TrAkToR, Devil, manish.17, taran_1407, minhcool, AlFlen, Utkarsh.25dec, NemanjaSo2005​, wxhtzdy, ajit, mnaeraxr, Scrubpai, YashDwivedi, eatmore!
And of course, MikeMirzayanov for great platforms Codeforces and Polygon.
This round is supported by NEAR, a company founded by former competitor AlexSkidanov. NEAR is built by many prominent competitive programmers, including twice ICPC champion eatmore and GCJ and TCO winner Egor.
The participants who end up in the first 255 positions will receive prizes. The participant on the first place will receive Ⓝ128, the next two participants will receive Ⓝ64, the next four participants will receive Ⓝ32, etc.
NEAR is a modern blockchain protocol and a development platform. NEAR applications have digital assets as a first class concept, and are hosted in a way that anyone can ascertain the correctness of their execution. This allows building applications that by design provide users with ownership over their assets, data and the power of governance.
If you want to try building on top of NEAR, join Metabuild, a hackathon running until February with $1M in prizes: https://metabuild.devpost.com/
We hope you will enjoy the problem set! Good luck!
Congratulations the winners!
  1. tourist
  2. ecnerwala
  3. ksun48
  4. Radewoosh
  5. Benq
UPD: Editorial
Read more »
Announcement of Good Bye 2021: 2022 is NEAR
2021, 2022, goodbye2021
 
 
 
 
+625
300iq
3 weeks ago
235
Likes in Posts and Comments
By MikeMirzayanov​, 4 weeks ago,

Hello.
Here's a small improvement for posts and comments. Likes can now be specified in their markup. Maybe this will be useful for organizing some kind of polls or collecting feedback.
Here are some examples:
Markup
Use square brackets instead of round
Result
Simple likes widget
(likes:1)
1183
Same keys means same likes widgets
(likes:2)
(likes:2)
785
785
Same keys and different groups can be used for exclusive choices
(likes:3,option1)
(likes:3,option2)
462
469
Yes, I know that this feature can be improved. I would prefer that we try to use it a little and understand what exactly is missing the most. Maybe we need to implement the fully functional polls.
Let's do a small survey using the new feature.
  1. What is your age range?
  2. Tabs or spaces?
  3. Have you had covid??
  4. Lately, there have been a lot of meaningless blogs on Codeforces. Is it worth strengthening measures to fight against them?
    • yes definitely: 979
    • rather yes, but not necessarily: 2355
    • rather no, I read some of them: 290
    • no definitely: 122
Read more »
codeforces, likes
 
 
 
 
+745
MikeMirzayanov
4 weeks ago
85
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