### diskoteka's blog

By diskoteka, 5 months ago, translation,

Hi everyone! I know of two problem solving modes on Codeforces

1. Write a contest online or in a virtual competition mode. Then you can't open the solutions of other participants, look through the tests, watch the problem tags and all sorts of information that can help you figure out the task.

2. Solve problems from the archive, in free manner. This can be used for training, it is convenient to sort tasks by specific topics or rating.

So, when solving the problem in the second way, I ran into the problem that I see its tags. It gives me an advantage that I don't want to have. A kind of hint. To solve this problem, I can launch a virtual participation in the contest where the task was. However, then I will not be able to get additional information about the task before the end of the virtual. What if I want to think for an hour and then look at the tags, for example.

The "hide tags" button, which I did not find (maybe it already exists), would help me here. I think it would be a useful feature.

• -6

By diskoteka, 12 months ago, translation,

We would like to thank all the participants who helped us and Codeforces to overcome the 40.000 registered users for the first time

1862A - Gift Carpet

Idea: diskoteka

Tutorial
Solution
Rate the problem

1862B - Sequence Game

Idea: diskoteka

Tutorial
Solution
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1862C - Flower City Fence

Idea: playerr17

Tutorial
Solution
Rate the problem

1862D - Ice Cream Balls

Idea: diskoteka, Ivang

Tutorial
Solution
Rate the problem

1862E - Kolya and Movie Theatre

Idea: pavlekn

Tutorial
Solution
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1862F - Magic Will Save the World

Idea: diskoteka

Tutorial
Solution
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1862G - The Great Equalizer

Idea: diskoteka

Tutorial
Solution
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• +96

By diskoteka, 12 months ago, translation,

## ☀ ☀ ☀ Hey Codeforces ☀ ☀ ☀

Summer is ending, but my team and I are happy to invite you to participate in Codeforces Round 894 (Div. 3). The round will take place on Aug/24/2023 17:35 (Moscow time). You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks.

You will be given 7 problems and 2 hours and 15 minutes to solve them.

Note that the penalty for the wrong submission in this round is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:

• take part in at least five rated rounds (and solve at least one problem in each of them)
• do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

Problems have been created and written by: diskoteka, pavlekn, playerr17. Ivang helped us with the idea of one of the tasks.

We would like to thank:

1. Vladosiya for coordinating the round

2. MikeMirzayanov for great Polygon and Codeforces platforms

3. feeder1, Xellos for red testing

4. michao, induk_v_tsiane, Phantom_Performer, vladmart, dmkz, LordVoIdebug, vrintle for yellow testing

5. kzyKT, celin for purple testing

6. segment_tea, Egorsa, MADE_IN_HEAVEN, Thost, BF_OF_Priety, mewnya, natalina, Serik2003 for blue testing

7. i_love_penguins, tnaito, akwa_blue, Zeyad_Hekal, NgJaBach for cyan testing

8. mkshh, myav for green testing

We wish you all good luck and a high rating!

UPD: Editorial published

• +370

By diskoteka, 13 months ago, translation,

1848A - Vika and Her Friends

Idea: diskoteka

Tutorial
Solution

1848B - Vika and the Bridge

Idea: diskoteka

Tutorial
Solution

1848C - Vika and Price Tags

Idea: pavlekn

Tutorial
Solution

1848D - Vika and Bonuses

Idea: diskoteka

Tutorial
Solution

1848E - Vika and Stone Skipping

Idea: diskoteka

Tutorial
Solution

1848F - Vika and Wiki

Idea: pavlekn

Tutorial
Solution
• +149

By diskoteka, 13 months ago,

## (っ▀¯▀)つ Heeey Codeforces (っ▀¯▀)つ

I and pavlekn are glad to invite everyone to participate in Codeforces Round 885 (Div. 2). The round will take place on Jul/16/2023 17:35 (Moscow time).

This round is dedicated to an amazingly beautiful girl Vika that I love very much. Every problem will be about her and related to her life.

The round will be rated for participants with rating lower than 2100. We will be glad to see the participants with a higher rating to take part in our round unofficially as well!

You will be given 6 problems to solve in 2 hours.

We would like to thank everyone that makes this round possible:

1. Artyom123 for coordinating the round

2. MikeMirzayanov for great Polygon and Codeforces platforms

3. teraqqq, Be_dos, mibig, FairyWinx, princebelkovetz for red testing

4. Dominater069, mbolgov, I.Gleb, induk_v_tsiane, Alexdat2000, maomao90, irkstepanov, fishy15 for yellow testing

5. Serik2003, alwyn for blue testing

6. TkachDan, ak2006 for cyan testing

7. maksimb2008 for grey testing

Scoring distribution: 500 — 1000 — 1500 — 2000 — 2250 — 2750.

We wish you all good luck and a high rating!

UPD: Editorial published

• +23

By diskoteka, 14 months ago, translation,

1840A - Cipher Shifer

Idea: isosto, preparation: isosto

Tutorial
Solution
Rate the problem

1840B - Binary Cafe

Idea: diskoteka, preparation: diskoteka

Tutorial
Solution
Rate the problem

1840C - Ski Resort

Idea: pavlekn, preparation: playerr17

Tutorial
Solution
Rate the problem

1840D - Wooden Toy Festival

Idea: diskoteka, preparation: diskoteka

Tutorial
Solution
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1840E - Character Blocking

Idea: diskoteka, preparation: diskoteka

Tutorial
Solution
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1840F - Railguns

Idea: diskoteka, preparation: diskoteka

Tutorial
Solution
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1840G1 - In Search of Truth (Easy Version)

Idea: pavlekn, preparation: pavlekn

Tutorial
Solution
Rate the problem

1840G2 - In Search of Truth (Hard Version)

Idea: pavlekn, preparation: pavlekn

Tutorial
Solution
Rate the problem
• +50

By diskoteka, 14 months ago, translation,

## Hey Codeforces (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

My team and I are happy to invite you to participate in Codeforces Round 878 (Div. 3). The round will take place on Jun/06/2023 17:35 (Moscow time). You will be offered 8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks.

You will be given 8 problems and 2 hours and 15 minutes to solve them. One of the problems in this round is interactive. Don't forget to read the guide on interactive problems.

Note that the penalty for the wrong submission in this round is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:

• take part in at least five rated rounds (and solve at least one problem in each of them)
• do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

Problems have been created and written by: diskoteka, pavlekn, playerr17, isosto.

We would like to thank:

1. Aris for coordinating the round

2. MikeMirzayanov for great Polygon and Codeforces platforms

3. step_by_step for red testing

4. Awesome3.14, I.Gleb, vladmart, dmkz, geospiza, phattd, fishy15 for yellow testing

5. KDZHR, D34D1NS1D3, JeffreyLC, NintsiChkhaidze, nickbelov, kamishogun, tolbi for purple testing

6. KoT_OsKaR, Gornak40, Serik2003, Nahian9696, Rudro25, ayhan23, Lyrically for blue testing

7. TkachDan for cyan testing

8. MODDI for green testing

9. midsho for grey testing

We wish you all good luck and a high rating!

UPD: Editorial published

• +329

By diskoteka, 16 months ago, translation,

1822A - TubeTube Feed

Idea: diskoteka, prepared: Vladosiya

Tutorial
Solution
Rate the problem

1822B - Karina and Array

Idea: playerr17, prepared: playerr17

Tutorial
Solution
Rate the problem

1822C - Bun Lover

Idea: diskoteka, prepared: diskoteka

Tutorial
Solution
Rate the problem

1822D - Super-Permutation

Idea: isosto, pavlekn, prepared: diskoteka

Tutorial
Solution
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1822E - Making Anti-Palindromes

Idea: pavlekn, prepared: pavlekn

Tutorial
Solution
Rate the problem

1822F - Gardening Friends

Idea: playerr17, prepared: playerr17

Tutorial
Solution
Rate the problem

1822G1 - Magic Triples (Easy Version)

Idea: pavlekn, prepared: pavlekn

Tutorial
Solution
Rate the problem

1822G2 - Magic Triples (Hard Version)

Idea: pavlekn, prepared: pavlekn

Tutorial
Solution
Rate the problem
• +51

By diskoteka, 16 months ago, translation,

Hello! Codeforces Round 867 (Div. 3) will start at Apr/24/2023 17:35 (Moscow time). You will be offered 6-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating of 1600 or higher, can register for the round unofficially.

The round will be hosted by rules of educational rounds (extended ICPC). Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks.

You will be given 6-8 problems and 2 hours and 15 minutes to solve them.

Note that the penalty for the wrong submission in this round is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as a trusted participant of the third division, you must:

• take part in at least five rated rounds (and solve at least one problem in each of them)
• do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

Thanks to MikeMirzayanov for the platform, and Vladosiya for coordination of our work. Problems have been created and written by: diskoteka, pavlekn, playerr17, isosto.

We would like to thank: pashka, purplesyringa, Alexdat2000, I.Gleb, Serik2003, TkachDan, maksimb2008, _--, 74TrAkToR, Gornak40, ut-k8g, Rudro25, Jostic11, yorky, tolbi, AhmetKaan, Splatjov, BF_OF_Priety, vrintle, KoT_OsKaR for testing the contest and valuable feedback.

Good luck!

UPD: Editorial

• +204