Educational Codeforces Round 75 [Rated for Div. 2]

Revision en5, by awoo, 2019-10-25 20:01:00

Hello Codeforces!

On Oct/24/2019 18:05 (Moscow time) Educational Codeforces Round 75 (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 7 problems and 2 hours to solve them.

The problems were invented and prepared by Roman Roms Glazov, 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!

Our friends at Harbour.Space also have a message for you:

Hello Codeforces,

We would like to invite all of you to Mike Mirzayanov's course Advanced Algorithms and Data Structures, which will take place in Barcelona, from the 6th to 24th of January, 2020.

The course will consist of three weeks of training, 5 training days each week. The program includes daily lectures and practical exercises. It will be quite educational, insightful and entertaining!

And you will have the opportunity to meet and talk with Mike, who will be happy to share his knowledge and stories about the history of Codeforces.

We are happy to offer a special price of 1,000 EUR* for all Codeforces users.

Register on the page below and we will contact you for the next steps. Hurry up! Only 10 spots available.

* The cost does not include travel or accommodation.


We would also like to recommend you an article published on our blog last week about the 5 reasons why traditional universities can’t keep up with humanity.

UPD: The start of the round is postponed by 30 minutes.

Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 neal 7 199
2 Anadi 7 205
3 risujiroh 7 208
4 imeimi 7 229
5 jiangly 7 273

96 successful hacks and 196 unsuccessful hacks were made in total!

And finally people who were the first to solve each problem:

Problem Competitor Penalty
A cxk0707 0:02
B wangziji 0:05
C Bohun 0:06
D guyan 0:16
E1 TwentyOneHundredOrBust 0:15
E2 TwentyOneHundredOrBust 0:14
F Radewoosh 0:19

UPD: Editorial is out


  Rev. Lang. By When Δ Comment
en5 English awoo 2019-10-25 20:01:00 72
ru7 Russian awoo 2019-10-25 20:00:39 74
en4 English awoo 2019-10-25 19:38:59 1669
ru6 Russian awoo 2019-10-25 19:38:08 1649
en3 English awoo 2019-10-24 17:16:20 63
ru5 Russian awoo 2019-10-24 17:15:50 49
ru4 Russian Una_Shem 2019-10-23 21:49:51 3 Мелкая правка: 'n\n_Привет Codeforces,_ \n\n_Мы ' -> 'n\n_Привет, Codeforces!_ \n\n_Мы '
ru3 Russian Una_Shem 2019-10-23 21:48:56 1612
ru2 Russian Una_Shem 2019-10-23 20:00:17 0 (опубликовано)
en2 English Una_Shem 2019-10-23 19:59:04 1623 (published)
en1 English awoo 2019-10-23 14:57:52 1280 Initial revision for English translation (saved to drafts)
ru1 Russian awoo 2019-10-23 14:57:00 1397 Первая редакция (сохранено в черновиках)