Educational Codeforces Round 54 [Rated for Div. 2]

Revision en7, by awoo, 2018-11-13 21:21:55

On Nov/12/2018 17:35 (Moscow time) Educational Codeforces Round 54 (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 extented ACM 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 and me.

Good luck to all participants!

UPD: There certainly will be a discussion of the problems on the local Discord server shortly after the contest ends. I might join it as well)

Congratulations to the winners:

Rank Competitor Problems Solved Penalty
1 Anadi 7 266
2 HIR180 6 129
3 mrscherry 6 152
4 Vergara 6 158
5 Jeel_Vaishnav 6 185

Congratulations to the best hackers:

Rank Competitor Hack Count
1 teapotd 100:-4
2 vlad.raw 52:-5
3 MarcosK 32
4 tataky 28:-5
5 knotValid 23
721 successful hacks and 668 unsuccessful hacks were made in total!

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

Problem Competitor Penalty
A Dalgerok 0:01
B Nazikk 0:03
C neal 0:03
D nell_jwk 0:14
E shadowatyy 0:13
F killer_god 0:34
G lxrvelory 1:03

UPD2: There was an error in problem D which caused some incorrect solutions to get accepted. We will investigate the number of users who were affected by this issue and decide whether the round is rated.

UPD3: We discussed the issue and came up with the following decision:

Those who got accepted earlier and get WA now won't be affected by rating changes. For everyone else (for those who got correct verdict) the contest will be rated.

UPD4: Editorial is out


  Rev. Lang. By When Δ Comment
en7 English awoo 2018-11-13 21:21:55 20
ru6 Russian awoo 2018-11-13 21:21:31 20
en6 English awoo 2018-11-13 19:09:03 2577
ru5 Russian awoo 2018-11-13 19:08:32 2553
ru4 Russian awoo 2018-11-13 19:06:31 78
en5 English awoo 2018-11-13 19:05:58 80
ru3 Russian awoo 2018-11-12 20:36:47 234
en4 English awoo 2018-11-12 20:34:08 244 Tiny change: 'rated.\n\nUPD3: We discu' -> 'rated.\n\n**UPD3*: We discu'
en3 English awoo 2018-11-12 19:42:38 207
ru2 Russian awoo 2018-11-12 19:42:12 331
en2 English awoo 2018-11-11 22:28:34 189 Tiny change: 'pants!\n\nThere cert' -> 'pants!\n\nUPD: There cert'
en1 English awoo 2018-11-11 17:18:36 1107 Initial revision for English translation
ru1 Russian awoo 2018-11-11 17:16:53 1255 Первая редакция (опубликовано)