Codeforces Round #639

Revision en11, by Monogon, 2020-05-08 20:19:44

Hello, Codeforces!

I'm very glad to invite you to Codeforces Round #639 (Div. 1) and Codeforces Round #639 (Div. 2). This contest will take place on May/06/2020 17:35 (Moscow time). In both divisions, you will have 2 hours 15 minutes to solve 6 problems. The score distribution will be announced closer to the start of the contest.

Of course, this round would not be possible without the help of many people, who I'd like to thank:

I've done my best to write clear problem statements and strong pretests. Don't forget to read all problems, and I hope you enjoy the round. Good luck!

Because I know you all have so many questions, I have compiled an FAQ:

  • Q: Is it rated?
  • A: Yes.


Here is the score distribution.

Div. 1: 500 — 1000 — 1500 — 1750 — 2500 — 2500

Div. 2: 500 — 1000 — 1500 — 2000 — 2500 — 2750

UPD Unfortunately, this contest is delayed due to problems in the Codeforces system. It is temporarily scheduled, but I will update this announcement when a final decision on scheduling has been made. It is sad that my contest is delayed, but let's be grateful that the issue was detected early instead of arising in the middle of the round. On the bright side, this may be the earliest announced score distribution in Codeforces history.

UPD The final decision on scheduling is to keep it as is. The contest will take place on May/06/2020 17:35 (Moscow time).

UPD Unfortunately due to the long queue and other issues, the contest is unrated. There was also a bug that gave us trouble in answering your questions. I'm sorry if you asked a question that went unanswered for a long time. I promise we did our best to answer as many questions as we could! Despite all the problems, I hope you enjoyed the problemset!

UPD Editorial


  Rev. Lang. By When Δ Comment
en11 English Monogon 2020-05-08 20:19:44 64
en10 English Monogon 2020-05-06 20:24:07 360
en9 English Monogon 2020-05-03 22:05:49 117
en8 English Monogon 2020-05-03 17:50:02 487
en7 English Monogon 2020-05-03 15:17:49 214 Tiny change: '- 2750**\nDiv. 1: ' -> '- 2750**\n\nDiv. 1: '
en6 English Monogon 2020-05-03 01:46:34 92
en5 English Monogon 2020-05-01 22:50:22 18 I had permission for this roast btw
en4 English Monogon 2020-05-01 22:48:36 0 (published)
en3 English Monogon 2020-05-01 22:48:04 143 (saved to drafts)
en2 English Monogon 2020-05-01 21:49:21 342 (published)
en1 English Monogon 2020-05-01 21:25:16 1083 Initial revision (saved to drafts)