Rating changes for the last round are temporarily rolled back. They will be returned soon. ×

 
 
 
 

You can use several words in query to find by all of them at the same time. In addition, if you are lucky search understands word forms and some synonyms. It supports search by title and author. Examples:

  • 305 — search for 305, most probably it will find blogs about the Round 305
  • andrew stankevich contests — search for words "andrew", "stankevich" and "contests" at the same time
  • user:mikemirzayanov title:testlib — search containing "testlib" in title by MikeMirzayanov
  • "vk cup" — use quotes to find phrase as is
  • title:educational — search in title

Results

 
 
 
 
1.
By MikeMirzayanov, 16 months ago, In English
Codeforces EDU: β-testing (Now in English!) <img src="/predownloaded/47/86/4786c2ec901c0b5b490794ca6fd5145f0dcdeae3.png" style="float:right; width: 400px; margin: 0 1em 1em 1em"/> Hello Codeforces! In February, in the Russian-language interface, we announced a new educational subsection of the website. It's time to go international! I am pleased to invite you to test the new section, which so far has the working title EDU. I hope that someday EDU will become a real educational hub for fans of programming competitions. It will be great to have in one place the collected educational content with text and video materials, with selected thematic problems. At the moment, its functionality is still under development, and here is the current progress and <i>β</i>-testing preview. Write your comments and suggestions in the comments here. <center style="margin:2.5em;"> <a href="/edu/courses" style="text-decoration:none; font-size:18px; background-color:#01579B; color:white; font-weight:bold; padding:0.5em 1em;">Go to EDU ...
interface, we announced a new educational subsection of the website. It's time to go international, that someday EDU will become a real educational hub for fans of programming competitions, In February, in the Russian-language interface, we announced a new educational subsection

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2.
By MikeMirzayanov, 15 months ago, In English
Educational Codeforces Round 91 is ruined and unrated Hello. Unfortunately, the Educational Codeforces Round 91 round will be unrated and, actually, it was completely ruined. I don’t understand what happened yet. At some point in time, all systems began to work unstably and actually stopped working. So far I have no understanding what happened. You may have to change the schedule for future rounds. Sorry. We have such a black stripe. Very upset and demotivated. Mike.
Educational Codeforces Round 91 is ruined and unrated, Hello. Unfortunately, the Educational Codeforces Round 91 round will be unrated and, actually, Unfortunately, the Educational Codeforces Round 91 round will be unrated and, actually

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3.
By MikeMirzayanov, 11 months ago, In English
Codeforces New Feature: Rewrite Statements in Mashups Hello Codeforces! There is something new for you. It seems that now it will be easier to reuse problems from the archive for educational and other purposes. As you know, problems from past Codeforces rounds can be added to <a href="https://codeforces.com/blog/entry/10099">mashups</a> simply by their codes of the form like <code>1234D</code> (contest ID + problem letter). I myself regularly used this when I taught at Saratov University &mdash; it was very convenient to prepare trainings: problems have expected complexity and topics, there are Russian and English statements, you can see the analysis and many solutions. Because of hacks and uphacks, problems in the archive usually have strong tests. Almost all of them are well-prepared. In addition, with the help of <a href="https://codeforces.com/blog/entry/21912">user lists</a>, you can easily pick up problems for a group of students that they did not solve. <img src="/predownloaded/2f/ec/2fecbf1f7e7a8f8655f0f74576fd1f6dbbc2307...
opens up for organizing trainings and educational sessions., the archive for educational and other purposes.

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4.
By MikeMirzayanov, history, 6 years ago, translation, In English
New: Educational Rounds on Codeforces! Hi everybody! First, I invite you to take part in an official [contest:597]. The fact is, the Codeforces team has made numerous changes to the platform (details are below), and we want to be sure that the basic functionality remained unchanged. This round will have a shortened duration of 1.5 hours, consist of 3 (maybe 4) problems that you might have already seen before. Its purpose is to test the system on the one hand, and on the other hand &mdash; to brighten up a Wednesday evening. Of course, the round will be unrated. Now the main thing. This coming Friday (yes, the 13th of November) Codeforces starts another line of rounds. We called them Educational Rounds. Using my students at the Saratov State University Programmings Competitions Training Center as an example, I regularly notice that even those who have a considerable progress in the results on the rounds often have narrow purview in terms of standard topics and ideas, they are not familiar with many well-known problems ...
New: Educational Rounds on Codeforces!, of November) Codeforces starts another line of rounds. We called them Educational Rounds. Using my students, of rounds. We called them Educational Rounds. Using my students at the Saratov State University, раундов. Мы назвали их учебными раундами (Educational Rounds). На примере моих студентов в Центре, We are pleased to announce the start of a series of educational rounds! They will take place

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5.
By MikeMirzayanov, 4 years ago, translation, In English
Codeforces: Results of 2017 <img src="/predownloaded/e4/09/e40915ee54c5991b91098756a90270d94be893b3.jpg"/> Happy New Year, Codeforces! I hasten to wish the whole community (and including me) correct programs, sudden insights, beautiful ideas and interesting problems! I hope that you have met the new year at least as fun as I am. Have you had enough sleep after New Year's Eve? This year, the traditional post summarizing the past year, I sat down to write only on January 1, 2018. I hope that I will not have to sum up the whole year. This post is important to me, since it draws a line to all the work done by the Codeforces team and the entire community in 2017. Many thanks to the team: all of the achievements listed below are the result of joint efforts. We did an excellent job! The community must know its heroes. In 2017, [user:MikeMirzayanov,2018-01-02], [user:KAN,2018-01-02] (problem coordinator), ~gritukan,2018-01-02 (second problem coordinator), ~netman,2018-01-02 (ex-second problem coordinator), ~k...
University — several joint with BootCamp rounds and Educational Rounds, * 8VC — a joint mini, University — несколько совместных с BootCamp раундов и совместное проведение линейкиEducational, — educational rounds, trainings in Codeforces::Gym and help in the development. I radiate

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6.
By KAN, 11 months ago, In English
How to set a round on Codeforces As you probably know, most of the rounds on Codeforces are created by active community members. We are very grateful to our talented authors from all around the world for bringing their ideas to tens of thousands of competitors, providing fun and learning experience for contestants of every expertise, from beginners to the world's top programmers. This post will cover the steps you need to take propose a round and become a problem writer on Codeforces. ## Who can be a problem author Best problems usually come from the most experienced participants. We have limited resources for rounds reviewing, so to make the process flawless for writers, starting January 1st, 2021, the following requirements for problem authors will be applied: - rating: 2100 or above, or - was a writer in the past. The restrictions may be updated in the future, the post will be updated accordingly. If your round is already in the review status, don't worry, it will be reviewed regardless of the current...
single problems. Also, we don't consider proposals for Div 3/4 or Educational rounds.

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7.
By awoo, history, 16 months ago, translation, In English
Educational Codeforces Round 90 [Rated for Div. 2] Hello Codeforces! On [contest_time:1373] [contest:1373] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2020-06-24] Glazov, Adilbek [user:adedalic,2020-06-24] Dalabaev, Vladimir [user:vovuh,2020-06-24] Petrov, Ivan [us...
Educational Codeforces Round 90 [Rated for Div. 2], Educational Codeforces Round 90 [рейтинговый для Div. 2], Hello Codeforces! On [contest_time:1373] [contest:1373] will start. Series of Educational, Series of Educational Rounds continue being held as [Harbour.Space University](https

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8.
By antontrygubO_o, 15 months ago, In English
Some thoughts on recent discussions Hello everyone! I finally decided to write some response/explain my view after all recent discussions of my problems and rounds I coordinate, and I would like to make a few points. **1.** After some recent contests there were a lot of comments saying that Data structure problems should appear as easy problems (say, D2A-D2D in a Div2 of $6$ problems) ![ ](https://i.imgur.com/fmA8zgE.png) ![ ](https://i.imgur.com/m4pJLv6.png) ![ ](https://i.imgur.com/JsryG77.png) I don't think I agree with this. To begin with, I don't think that having Data Structure problem is a requirement for a good contest at all, not just in first few positions. ![ ](https://i.imgur.com/VWAOgxg.png) However, for positions D2A-D2D, I just don't see a way to properly include data structure problems. Take some Data Structure problem, it consists from two parts: <ul> <li> Knowing/implementing the Data Structure </li> <li> Actually thinking about the problem, and how this Data Structure...
trivial, then the problem shouldn't be used in official CF contest (maybe in Educational Round only

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9.
By awoo, history, 15 months ago, translation, In English
Educational Codeforces Round 91 [Rated for Div. 2] Hello Codeforces! On [contest_time:1380] [contest:1380] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2020-07-11] Glazov, Adilbek [user:adedalic,2020-07-11] Dalabaev, Vladimir [user:vovuh,2020-07-11] Petrov, Ivan [us...
Educational Codeforces Round 91 [Rated for Div. 2], Educational Codeforces Round 91 [рейтинговый для Div. 2], Hello Codeforces! On [contest_time:1380] [contest:1380] will start. Series of Educational, Series of Educational Rounds continue being held as [Harbour.Space University](https

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10.
By BledDest, history, 12 months ago, translation, In English
Educational Codeforces Round 96 [Rated for Div. 2] Hello Codeforces! On [contest_time:1430] [contest:1430] will start. **Note that the start time is unusual**. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 [user:adedalic,2020-10-10] Dalabaev, Alex [user:fcspartakm,2020-10-10] Frolov an...
Educational Codeforces Round 96 [Rated for Div. 2], Educational Codeforces Round 96 [рейтинговый для Div. 2], is unusual**. Series of Educational Rounds continue being held as [Harbour.Space University, Series of Educational Rounds continue being held as [Harbour.Space University](https

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11.
By awoo, history, 18 months ago, translation, In English
Educational Codeforces Round 85 [Rated for Div. 2] Hello Codeforces! On [contest_time:1334] [contest:1334] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2020-04-09] Glazov, Adilbek [user:adedalic,2020-04-09] Dalabaev, Vladimir [user:vovuh,2020-04-09] Petrov, Ivan [us...
Educational Codeforces Round 85 [Rated for Div. 2], Educational Codeforces Round 85 [рейтинговый для Div. 2], специальный приз для следующего Educational Round, место на курсе по вашему выбору из наших программ по, Hello Codeforces! On [contest_time:1334] [contest:1334] will start. Series of Educational, Series of Educational Rounds continue being held as [Harbour.Space University](https, _Looking forward to seeing you kick some ass in the next Educational Round, and stay safe!_, _That’s why we have a special prize for the next Educational Round, a space in a course of your, _Вот почему у нас есть специальный приз для следующего Educational Round, место на курсе по вашему

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12.
By MikeMirzayanov, 20 months ago, translation, In English
Codeforces: Results of 2019 <a style="float:right; display: inline-block; margin:0 1em 1em 2em; max-width: 60%;" href="https://codeforces.com/10years"/> <img style="max-width:100%" src="https://assets.codeforces.com/images/codeforces-10-years-300.png"/> </a> Hi Codeforces! The platform recently turned 10 years old. We accept your congratulations at <a href="https://codeforces.com/10years">https://codeforces.com/10years</a>. Please review the progress in 2019 and support the anniversary crowdfunding campaign. Your donation will be a contribution to the future of Codeforces, will help its development and work. We need resources to continue to host rounds, not to stop developing, to innovate and to maintain the existing infrastructure. In 2019, together with numerous writers the coordinators worked on problems: [user:KAN,2020-02-06], [user:300iq,2020-02-06], [user:cdkrot,2020-02-06], [user:arsijo,2020-02-06] and recently joined [user:isaf27,2020-02-06]. And this year, rounds coordinated by other exper...
University** — a series of educational rounds, the selection of summer school Tech Scouts

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13.
By awoo, history, 9 months ago, translation, In English
Educational Codeforces Round 103 [Rated for Div. 2] Hello Codeforces! On [contest_time:1476] [contest:1476] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2021-01-28] Glazov, Adilbek [user:adedalic,2021-01-28] Dalabaev, Vladimir [user:vovuh,2021-01-28] Petrov, Ivan [us...
Educational Codeforces Round 103 [Rated for Div. 2], Hello Codeforces! On [contest_time:1476] [contest:1476] will start. Series of Educational, Series of Educational Rounds continue being held as [Harbour.Space University](https

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14.
By Adhami, history, 3 years ago, In English
Educational Rounds Wrapper — Python Script If you ask a Jordanian competitive programmer for a training advice, there is 98% chance that he would recommend you to solve Educational Rounds, ask [user:Hiasat,2019-03-14]. However, getting your progress in Educational round tracked is hard, so here it comes! I wrote this script way before, but my friends recently encouraged me to post it. It gets every Educational Round and what you have already solved in it. ``` import urllib.request, json import datetime s = [] w = [] with urllib.request.urlopen("https://codeforces.com/api/contest.list") as url: data = json.loads(url.read().decode()) for x in data["result"]: if x["name"].startswith("Educational"): w.append(x["name"]) s.append(x["id"]) e = [""]*len(w) #Edit this line to your handle: USER_NAME = "CPX" with urllib.request.urlopen("https://codeforces.com/api/user.status?handle="+USER_NAME) as url: data = json.loads(url.read().decode()) for x in data["result"]: if "verdict" in x and "contestI...
Educational Rounds Wrapper — Python Script, >> Solve Educational!

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15.
By awoo, history, 18 months ago, translation, In English
Educational Codeforces Round 86 [рейтинговый для Div. 2] Привет, Codeforces! В [contest_time:1342] состоится [contest:1342]. Продолжается серия образовательных раундов в рамках инициативы [Harbour.Space University](https://harbour.space/)! Подробности о сотрудничестве [Harbour.Space University](https://harbour.space/) и Codeforces можно прочитать <a href="http://codeforces.com/blog/entry/51208">в посте</a>. Этот раунд будет **рейтинговым для участников с рейтингом менее 2100**. Соревнование будет проводиться по немного расширенным правилам ICPC. Штраф за каждую неверную посылку до посылки, являющейся полным решением, равен 10 минутам. После окончания раунда будет период времени длительностью в 12 часов, в течение которого вы можете попробовать взломать абсолютно любое решение (в том числе свое). Причем исходный код будет предоставлен не только для чтения, но и для копирования. Вам будет предложено **6 или 7 задач на 2 часа**. Мы надеемся, что вам они покажутся интересными. Задачи вместе со мной придумывали и готовили Роман ...
Educational Codeforces Round 86 [Rated for Div. 2], Educational Codeforces Round 86 [рейтинговый для Div. 2], Series of Educational Rounds continue being held as [Harbour.Space University](https, _You really went for it in the last Educational Round! We had an all-time high participation, _Вы сделали это! В прошлом Educational Round у нас было рекордно высокое участие — 21750

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16.
By -is-this-fft-, 8 months ago, In English
[Feature request] Some suggestions for blogs I wanted to suggest some improvements for the blog system. Some of these things have probably been said before. Some of these things should be pretty easy to implement, others are harder and might require a complete rework. I tried to put the easy things first. #### Let's do something about necroposting This is probably my biggest pet peeve about Codeforces blogs. Most of the time, Recent Actions is filled with very old blogs, some of which have been brought up for pretty much no reason at all. Currently, we have [useful C++ "library](https://codeforces.com/blog/entry/8387) from 2013 in Recent Actions, where the recent comment answers an old question which has already been answered better. Similarly, there is [How to add friends?](https://codeforces.com/blog/entry/2006) which was brought up to make some joke that has already been done. The thing is though, a lot of the time these blogs are not brought up by trolls or anything like that. They are brought up by helpful people wh...
#### Have a separate place for educational resources

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17.
By Edvard, history, 6 years ago, translation, In English
Educational Codeforces Round #1 Привет, Codeforces! [13 ноября 2015 года в 18:00 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Educational+Codeforces+Round+%231&iso=20151113T1500) состоится первый учебный раунд Educational Codeforces Round #1 для участников из первого и второго дивизионов. Учебные раунды Codefores &mdash; это новый формат соревнований основной целью, которого является помощь в развитии у участников базовых (и не только) навыков и знаний, которые необходимы при решении олимпиадных задач по программированию. В учебных раундах вы встретите не только старые добрые идеи и алгоритмы, которые многие знают, но также и некоторые расширенные темы, которые неизвестны многим участникам, в том числе и из первого дивизиона. Сложность задач будет сравнима с обычными раундами для участников из второго дивизиона, хотя многое может пригодиться и участникам из первого дивизиона. На мой взгляд первый раунд получился несколько проще того на что мы ориентировались. Учебные раунды будут нерейтингов...
Educational Codeforces Round #1, =Educational+Codeforces+Round+%231&iso=20151113T1500) состоится первый учебный раундEducational Codeforces

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18.
By awoo, history, 3 years ago, translation, In English
Educational Codeforces Round 44 (рейтинговый для Див. 2) Привет, Codeforces! В [contest_time:985] состоится Educational Codeforces Round 44. Продолжается серия образовательных раундов в рамках инициативы [Harbour.Space University](https://harbour.space/)! Подробности о сотрудничестве [Harbour.Space University](https://harbour.space/) и Codeforces можно прочитать <a href="http://codeforces.com/blog/entry/51208">в посте</a>. Этот раунд будет **рейтинговым для участников с рейтингом менее 2100**. Соревнование будет проводиться по немного расширенным правилам ACM ICPC. После окончания раунда будет период времени длительностью в один день, в течение которого вы можете попробовать взломать абсолютно любое решение (в том числе свое). Причем исходный код будет предоставлен не только для чтения, но и для копирования. Вам будет предложено **7 задач на 2 часа**. Мы надеемся, что вам они покажутся интересными. Задачи вместе со мной готовили Адилбек [user:adedalic,2018-05-20] Далабаев и Владимир [user:Vovuh,2018-05-20] Петров. Удач...
Educational Codeforces Round 44 (рейтинговый для Див. 2), Educational Codeforces Round 44 [Rated for Div. 2], On [contest_time:985] Educational Codeforces Round 44 will start., В [contest_time:985] состоится Educational Codeforces Round 44.

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19.
By awoo, history, 17 months ago, translation, In English
Educational Codeforces Round 88 [Rated for Div. 2] Hello Codeforces! On [contest_time:1359] [contest:1359] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2020-05-27] Glazov, Adilbek [user:adedalic,2020-05-27] Dalabaev, Vladimir [user:vovuh,2020-05-27] Petrov, Ivan [us...
Educational Codeforces Round 88 [Rated for Div. 2], Series of Educational Rounds continue being held as [Harbour.Space University](https

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20.
By awoo, history, 6 months ago, translation, In English
Educational Codeforces Round 108 [Rated for Div. 2] Hello Codeforces! On [contest_time:1519] [contest:1519] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2021-04-28] Glazov, Adilbek [user:adedalic,2021-04-28] Dalabaev, Vladimir [user:vovuh,2021-04-28] Petrov, Ivan [us...
Educational Codeforces Round 108 [Rated for Div. 2], Series of Educational Rounds continue being held as [Harbour.Space University](https

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21.
By MikeMirzayanov, 5 years ago, translation, In English
For contest writers: proposal tracking system <i>In 2021, some details (including requirements for problem writers) were changed. Read <a href="https://codeforces.com/blog/entry/85259">the link</a> for details.</i> Hello, Codeforces! New year brings changes to the Codeforces team. <a href="/blog/entry/49466">As you probably know</a> [user:GlebsHP,2017-01-04] completed his work as the chief coordinator of Codeforces. Gleb, thanks a lot! You did an excellent job and coordinated a lot of interesting rounds. You're a professional, an interesting person, you have impeccable taste to problems, and you proved to be brilliant and talented writer. Thank you that you were with us! Hope to see your tasks on Codeforces many times again! Nikolay [user:KAN,2017-01-04] Kalinin came to Gleb's place. He is also an experienced participant, Nikolay has already held several rounds as a coordinator. [user:KAN,2017-01-04] seriously engaged in programming contests since he was 12 years old. His major achievements: he won twice All-Russian Scho...
Later we come up with how to adapt the system for educational rounds (they come back

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22.
By Anadi, history, 17 months ago, In English
Codeforces Round #647 — Thanks, Algo Muse! Hello Codeforces! We have a pleasure to invite you to [Codeforces Round #647 (Div. 1)](https://codeforces.com/contests/1361) and [Codeforces Round #647 (Div. 2)](https://codeforces.com/contests/1362). This round will take place on [contest_time:1361]. In both divisions, you will have **2.5 hours** to solve **6 problems**. Three of them will be shared. The problems for this round were prepared by [user:MicGor,2020-06-02], [user:Grzmot,2020-06-02], [user:Okrut,2020-06-02] and me. We would like to thank everyone who made this round possible: - [user:Nebuchadnezzar,2020-06-02] for the excellent coordination; - [user:Lewin,2020-06-02], [user:ALILILILILI-KHAN,2020-06-02] for invaluable advice and extensive testing; - [user:KrK,2020-06-02], [user:yarek,2020-06-02], [user:-is-this-fft-,2020-06-02], [user:w0nsh,2020-06-02], [user:Marckess,2020-06-02], [user:Ari,2020-06-02], [user:Fortin,2020-06-02], [user:Dup4,2020-06-02], [user:kraborak,2020-06-02], [user:300iq,2020-06-02], ...
_Algo Muse is an educational site that conducts online algorithmic contests in pen-and-paper style

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23.
By Edvard, history, 6 years ago, translation, In English
Educational Codeforces Round 11 Hello, Codeforces! Educational Codeforces Round 11 will take place on [8 april 2016 at 18:00 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Educational+Codeforces+Round+11&iso=20160408T1500) for the first and the second divisions. \<The changes in the last paragraph\> The round will be unrated for all users and it will be held with extented ACM ICPC rules. You will have two hours to solve six problems. After that you will have one day to hack any solution you want. You will have access to copy any solution and test it locally. If you have ideas for some problems or maybe already prepared problems that you can't use in rounds or official competitions, you can write to me. It seems that it is harder to invent interesting simple problems (like A and B) than difficult ones. So don't be afraid to suggest interesting simple or very simple tasks (of course the difficult tasks are also needed). Please send only the problems for which you know the solution with c...
Educational Codeforces Round 11, =Educational+Codeforces+Round+11&iso=20160408T1500) состоится очередной одиннадцатый учебный раундEducational

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24.
By awoo, history, 3 years ago, translation, In English
Educational Codeforces Round 48 [Rated for Div. 2] On [contest_time:1016] Educational Codeforces Round 48 will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. This round will be **rated for the participants with rating lower than 2100**. It will be held on extented ACM ICPC rules. 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 **7 problems** and **2 hours** to solve them. The problems were invented and prepared by Ivan [user:BledDest,2018-08-02] Androsov, Roman [user:Ajosteen,2018-08-02] Glazov, Adilbek [user:adedalic,2018-08-02] Dalabaev, Vladimir [user:Vovuh,2018-08-02] Petrov and me. Good luck to all participants! Congratulations to th...
Educational Codeforces Round 48 [Rated for Div. 2], On [contest_time:1016] Educational Codeforces Round 48 will start.

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25.
By Edvard, history, 6 years ago, translation, In English
Educational Codeforces Round 7 Hello, Codeforces! Educational Codeforces Round 7 will take place on [10 February 2016 at 18:00 MSK](http://www.timeanddate.com/worldclock/fixedtime.html?msg=Educational+Codeforces+Round+7&iso=20160210T1500) for the first and second divisions. You can read about educational rounds [here](http://codeforces.com/blog/entry/21496) and [here](http://codeforces.com/blog/entry/21565). \<This paragraph was modified last time\> The round will be unrated for all users and it will be held with extented ACM ICPC rules. You will have two hours to solve six problems. After that you will have one day to hack any solution you want. You will have access to copy any solution and test it locally. If you have ideas for some problems or maybe already prepared problems that you can't use in rounds or official competitions, you can write to me. \</This paragraph was modified last time\> Thanks a lot to Aleksa Plavsic [user:allllekssssa,2016-02-08] who suggested the problems D, E and Ivan Po...
Educational Codeforces Round 7, =Educational+Codeforces+Round+7&iso=20160210T1500) состоится седьмой учебный раундEducational Codeforces

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26.
By awoo, history, 11 months ago, translation, In English
Educational Codeforces Round 98 [Rated for Div. 2] Hello Codeforces! On [contest_time:1452] [contest:1452] will start. Series of Educational Rounds continue being held as [Harbour.Space University](https://harbour.space/) initiative! You can read the details about the cooperation between [Harbour.Space University](https://harbour.space/) and Codeforces in the <a href="http://codeforces.com/blog/entry/51208">blog post</a>. 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 Roman [user:Roms,2020-11-18] Glazov, Adilbek [user:adedalic,2020-11-18] Dalabaev, Vladimir [user:vovuh,2020-11-18] Petrov, Ivan [us...
Educational Codeforces Round 98 [Rated for Div. 2], Series of Educational Rounds continue being held as [Harbour.Space University](https

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27.
By awoo, history, 17 months ago, translation, In English
Educational Codeforces Round 87 Editorial [problem:1354A] Idea: [user:BledDest,2020-05-18] <spoiler summary="Tutorial"> [tutorial:1354A] </spoiler> <spoiler summary="Solution (pikmike)"> ~~~~~ t = int(input()) for _ in range(t): a, b, c, d = map(int, input().split()) if b >= a: print(b) continue if c <= d: print(-1) continue a -= b dif = c - d print(b + (a + dif - 1) // dif * c) ~~~~~ </spoiler> [problem:1354B] Idea: [user:BledDest,2020-05-18] <spoiler summary="Tutorial"> [tutorial:1354B] </spoiler> <spoiler summary="Solution (BledDest)"> ~~~~~ #include<bits/stdc++.h> using namespace std; char buf[200043]; int main() { int t; scanf("%d", &t); for(int i = 0; i < t; i++) { scanf("%s", buf); string s = buf; int ans = int(1e9); int n = s.size(); vector<pair<char, int> > c; for(auto x : s) { if(c.empty() || c.back().first != x) c.push_back(make_pair(x, 1)); else c.back().second++; } int m = c.size(); for...
Educational Codeforces Round 87 Editorial

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