Rating changes for the last round are temporarily rolled back. They will be returned soon. ×

IgorI's blog

By IgorI, history, 5 weeks ago, In English

Thank you for participating in the contest! I hope you enjoyed the tasks. Here is an editorial with hints.

1474A - Puzzle From the Future

Hint 1
Hint 2
Editorial
Solution

1474B - Different Divisors

Hint 1
Hint 2
Hint 3
Editorial
Solution

1474C - Array Destruction

Hint 1
Hint 2
Hint 3
Hint 4
Editorial

1474D - Cleaning

Hint 1
Hint 2
Hint 3
Hint 4
Editorial
Solution

1474E - What Is It?

Hint 1
Hint 2
Hint 3
Hint 4
Editorial
Solution

1474F - 1 2 3 4 ...

Bonus
Editorial
Solution

Good luck in your future contests!

Read more »

 
 
 
 
  • Vote: I like it
  • +307
  • Vote: I do not like it

By IgorI, history, 6 weeks ago, translation, In English

Hi, Codeforces!

I'm glad to invite you to take part in Codeforces Round #696, which will take place on Jan/19/2021 17:35 (Moscow time). Round will be rated for participants with rating less than $$$2100$$$. Participants from the first division can take part out of competition.

There will be $$$6$$$ problems for $$$2$$$ hours. All problems are authored by me. Thanks to adedalic for excellent round coordination and to MikeMirzayanov for Codeforces and Polygon.

Also thanks to testers errorgorn, awoo, rkm62, khiro, AmShZ, IaMaNanBord, Osama_Alkhodairy, Prakash11, Gauravvv, HIS_GRACE, Dragnoid99 for testing the round and giving valuable feedback for problems.

Scoring is $$$500-1000-1500-2000-2250-3000$$$.

Good luck!

UPD: Editorial

UPD: Congratulations to the winners!

Of both divisions:

  1. neal

  2. antontrygubO_o

  3. HIR180

  4. fuppy

  5. Thienu

Of the second division:

  1. EzioAuditoreDaFirenze

  2. Ishtar

  3. God_Of_Blunder

  4. Shivam_18

  5. AlphaAurigae

Read more »

 
 
 
 
  • Vote: I like it
  • +614
  • Vote: I do not like it

By IgorI, history, 7 weeks ago, In English
Tutorial is loading...
Tutorial is loading...
Tutorial is loading...
Tutorial is loading...
Tutorial is loading...
Tutorial is loading...
Tutorial is loading...
Tutorial is loading...

Read more »

 
 
 
 
  • Vote: I like it
  • +232
  • Vote: I do not like it

By IgorI, history, 7 weeks ago, translation, In English

Hello Codeforces!

Now the winter SIS (Summer Informatics School) is taking place, and parallel A+A0 and its teachers have prepared a complete Codeforces Round. You can check previous rounds, prepared by SIS students: Codeforces Round #612, Codeforces Round #530.

Codeforces Round #694 begins on Jan/05/2021 17:35 (Moscow time). In both redactions, there will be $$$6$$$ problems for $$$2$$$ hours. The round is rated for both divisions.

Problems are authored and prepared by AliceG, Pakhomovee, MadProgrammer, ArtNext, fastmath, IgorI, Kapt, KhB, Hello_zoka, Karabutsa, Arbuzniy_kekich, Mangooste, pelmenner, Allvik06 under the guidance of meshanya, cdkrot, kokokostya, kraborak, scanhex.

We would like to thank:

We recommend you to read the statements of all problems. Scoring will be announced later.

Good luck!

Scoring distribution is: $$$500 - 750 - 1000 - 1500 - 2000 - 2500$$$ in both divisions.

Editorial

System testing is over. Thank you for participating! We hope that you liked our problems!

Congratulations to the winners:

  1. tourist

  2. Petr

  3. jiangly

  4. Radewoosh

  5. ecnerwala

  6. Maksim1744

  7. lumibons

  8. Endagorion

  9. ainta

  10. DmitryGrigorev

  11. neal

All of them have solved problem E (with neal being the first). Problem F was quite challenging and no one have solved it during the contest.

Read more »

 
 
 
 
  • Vote: I like it
  • +529
  • Vote: I do not like it