Codeforces Round #670 (Div. 2)

Revision en9, by tianbu, 2020-09-13 03:14:36

Hello Codeforces!

gyh20 and I are glad to invite you to Codeforces Round #670 (Div. 2) which will start on Sep/12/2020 16:45 (Moscow time). Note the unusual start time of the round.

The contest will last for two hours, and you will have five tasks to solve. The tasks are prepared by me and gyh20. This round is rated for participants whose rating is not higher than 2099. You can see that my current rating is exactly 2099 :)

There might be an interactive problem. You can learn about them here.

We would like to thank:

We tried our best to make the statements short and clear, pretests strong and problems interesting. We hope you like the problems!

Score distribution will be announced shortly before the round.

Good luck and have fun!

Upd: Score distribution is 500-750-1250-1750-2500.

Upd: For problem reasons, the contest is delayed for 10 minutes. We are very sorry to keep you waiting, sorry again.

Upd: Score distribution is changed to 500-1000-1500-2000-2750.

Upd: The round is finished. We're really sorry for B being well-known (none of the testers knew the harder version of this problem in ABC173E). Still, congrarulations to the winners!

Div1 (unofficial):

  1. WZYYN
  2. Geothermal
  3. kort0n
  4. neal
  5. kotatsugame


  1. JSoap
  2. DemolitionLovers
  3. killyou
  4. gmh77
  5. WaterCrysital

Upd: Editorial is out here.


  Rev. Lang. By When Δ Comment
en9 English tianbu 2020-09-13 03:14:36 56
en8 English tianbu 2020-09-12 19:15:47 537
en7 English tianbu 2020-09-12 16:36:26 74
en6 English tianbu 2020-09-12 16:25:46 124
en5 English tianbu 2020-09-12 13:27:14 2
en4 English tianbu 2020-09-12 11:26:16 62
en3 English tianbu 2020-09-10 09:59:58 50
en2 English tianbu 2020-09-10 09:37:41 3 (published)
en1 English tianbu 2020-09-10 08:46:55 1573 Initial revision (saved to drafts)