### Karavaiev's blog

By Karavaiev, history, 3 months ago,

Thanks for participating!

1521A - Nastia and Nearly Good Numbers

Tutorial
Solution

1521B - Nastia and a Good Array

Tutorial
Solution

1521C - Nastia and a Hidden Permutation

Tutorial
Solution 1

1521D - Nastia Plays with a Tree

Tutorial
Solution

1521E - Nastia and a Beautiful Matrix

Tutorial
Solution

• +134

By Karavaiev, 3 months ago,

Hi, Codeforces!

I'm glad to invite you to take part in Codeforces Round #720 (Div. 2), which will take place on 07.05.2021 17:35 (Московское время). The round will be rated for the participants with a rating lower than 2100. Participants from the first division are also welcomed to take part out of competition.

You will be given 2 hours 15 minutes to solve 5 problems. All the problems were created and prepared by me. One of the problems is interactive, please read the guide of interactive problems before the contest.

Huge thanks to those who helped make this round possible:

I tried my best to create interesting problems and clear statements, so don't forget to read all ones :)

Scoring: $500-1000-1750-2250-2750$.

Hope you enjoy it!

UPD: Editorial is published!

UPD: Congratulations to the winners!

Div. 1:

Div. 2:

• +273

By Karavaiev, 9 months ago,

Hello Codeforces!

At the end of August, I (and my friend) proposed Div 2 contest and don't get the review for now. In general, it's okay. We understand that this not maybe so fast and 3+ month delay it's normal, but it's not really clear when it will happen.

I tried to ask MikeMirzayanov and after that KAN. And they gave us some information about the situation with proposals queue. (Thanks to them indeed. Cool when the organisers respond in person)

I think it would be cool If contest authors have the possibility to view approximate position in the proposals queue and to estimate the approximate time of receipt their review. And today I want to ask the Codeforces community about the need to introduce such a feature, and the Codeforces organisers about the possibility of implementing something similar.

And I certainly want to thank Codeforces for the opportunity to participate in the preparation of the round (as an author or a tester) and all coordinators for their hard work!

• +165

By Karavaiev, history, 12 months ago,

1388A - Captain Flint and Crew Recruitment

Idea: Denisov

Tutorial
Solution (Karavaev1101)

1388B - Captain Flint and a Long Voyage

Idea: Karavaiev

Tutorial
Solution (Karavaev1101)

1388C - Uncle Bogdan and Country Happiness

Idea: Karavaiev

Tutorial
Solution (Karavaev1101)

1388D - Captain Flint and Treasure

Idea: Denisov

Tutorial
Solution (Denisov)
Solution (Karavaev1101)

1388E - Uncle Bogdan and Projections

Idea: perekopskiy

Tutorial
Solution (perekopskiy)

• +245

By Karavaiev, 17 months ago,

72448209 it is my first submission.

72460522 it is my last submission.

What have I done wrong ?