Educational Codeforces Round 66 [Rated for Div. 2]

Revision en4, by PikMike, 2019-06-06 18:51:38

Hello Codeforces!

On Jun/05/2019 17:35 (Moscow time) Educational Codeforces Round 66 (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 Ne0n25 Mescheryakov and me. Also huge thanks to Mike MikeMirzayanov Mirzayanov for great systems Polygon and Codeforces.

Good luck to all participants!


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

Codeforces! What is the next step in your development?

We understand all about doing things by yourself — after all, we are a startup university, and our student body is exceptional in part because of it’s made up of people who didn’t wait for anyone to show them the way.

If this is you, you belong at Harbour.Space. The purpose of our University is to create a global community of these kinds of people, regardless of age or nationality, because when you’re working by yourself, you can change for the better, but when you work with others, you can change the world.

If you believe you have what it takes, we want you!

The curriculum is part of what makes the modules so special, and the other half? Our outstanding teachers who are leaders in their own respective industries.

Our scholarships are set in such a way that doesn’t require additional applications — we believe in merit and potential, and so what you put in your application to the university will be our criteria.

You could be just the diamond we’re looking for, but you’ll never know unless you apply!


Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 mango_lassi 6 145
2 E869120 6 148
3 kefaa2 6 154
4 egor.lifar 6 154
5 Aria 6 157

Congratulations to the best hackers:

Rank Competitor Hack Count
1 Radewoosh 97:-19
2 test_hack 56:-37
3 alvinvaja 30:-10
4 AryaKnight 48:-48
5 nikolapesic2802 30:-14
779 successful hacks and 1077 unsuccessful hacks were made in total!

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

Problem Competitor Penalty
A Geothermal 0:01
B mango_lassi 0:05
C nuip 0:07
D Yushen 0:04
E Sehnsucht 0:20
F osaaateiasavtnl. 0:05
G LgndryGrandmasturbator 0:47

UPD: The editorial is out


  Rev. Lang. By When Δ Comment
en4 English PikMike 2019-06-06 18:51:38 76
ru4 Russian PikMike 2019-06-06 18:51:17 74
en3 English PikMike 2019-06-06 11:42:08 2680
ru3 Russian PikMike 2019-06-06 11:41:50 2650
ru2 Russian Una_Shem 2019-06-04 19:15:47 1404
en2 English Una_Shem 2019-06-04 19:11:02 1552
en1 English PikMike 2019-06-04 13:15:21 1278 Initial revision for English translation
ru1 Russian PikMike 2019-06-04 13:14:38 1397 Первая редакция (опубликовано)