natalina's blog

By natalina, history, 2 weeks ago, translation, In English

1941A - Rudolf and the Ticket

Author: daha.002

Tutorial
Solution
Rate the problem

1941B - Rudolf and 121

Author: Vladosiya

Tutorial
Solution
Rate the problem

1941C - Rudolf and the Ugly String

Author: Mordvin13

Tutorial
Solution
Rate the problem

1941D - Rudolf and the Ball Game

Author: Alexey_Parsh

Tutorial
Solution
Rate the problem

1941E - Rudolf and k Bridges

Author: t0rtik

Tutorial
Solution
Rate the problem

1941F - Rudolf and Imbalance

Author: Vladosiya

Tutorial
Solution
Rate the problem

1941G - Rudolf and Subway

Author: natalina

Tutorial
Solution
Rate the problem

Full text and comments »

  • Vote: I like it
  • +61
  • Vote: I do not like it

By natalina, history, 3 weeks ago, translation, In English

Hello, Codeforces!

On Mar/11/2024 17:35 (Moscow time) Codeforces Round 933 (Div. 3) will start.

You will be offered 7 problems, dedicated to the adventures of a restless mathematician, a programmer and just a funny character named Rudolf and his brother Bernard, and 2 hours 15 minutes to solve them. Problems have 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.

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. 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: vladmart, Sasha0738, t0rtik, Alexey_Parsh, Mordvin13, daha.002, Vladosiya and natalina.

We would like to thank:

  1. Vladosiya and Gornak40 for coordinating the round.

  2. MikeMirzayanov for Polygon and Codeforces platforms and helping prepare the problems.

  3. step_by_step, ashmelev for red testing.

  4. KseniaShk, senjougaharin for yellow testing.

  5. robotolev, Sochu for purple testing.

  6. dan_dolmatov, SashaT9, FBI, SpicyOctopus for blue testing.

  7. Gargera0, Matrosk1n, Alex_TULGU, Alenochka, gas for cyan testing.

  8. bugrova, Toy_mouse, ringku_ for green testing.

Good luck!

UPD: Because of the technical issue (see the post https://codeforces.com/blog/entry/126654), temporarily the only available C++ compilers are: C++14 (GCC 6-32) and C++17 (GCC 7-32).

UPD2: Editorial is posted.

Full text and comments »

  • Vote: I like it
  • +188
  • Vote: I do not like it

By natalina, 9 months ago, translation, In English

1846A - Rudolph and Cut the Rope

Author: Sasha0738

Hint 1
Hint 2
Tutorial
Solution
Rate the problem

1846B - Rudolph and Tic-Tac-Toe

Author: Sasha0738

Hint 1
Tutorial
Solution
Rate the problem

1846C - Rudolf and the Another Competition

Author: vladmart

Hint 1
Hint 2
Tutorial
Solution
Rate the problem

1846D - Rudolph and Christmas Tree

Author: vladmart

Hint 1
Hint 2
Hint 3
Tutorial
Solution
Rate the problem

1846E1 - Rudolf and Snowflakes (simple version)

Author: natalina

Hint 1
Hint 2
Hint 3
Tutorial
Solution
Rate the problem

1846E2 - Rudolf and Snowflakes (hard version)

Author: natalina

Hint 1
Hint 2
Hint 3
Hint 4
Tutorial
Solution
Rate the problem

1846F - Rudolph and Mimic

Author: Sasha0738

Hint 1
Hint 2
Tutorial
Solution
Rate the problem

1846G - Rudolf and CodeVid-23

Author: vladmart

Hint 1
Hint 2
Hint 3
Tutorial
Solution
Rate the problem

Full text and comments »

  • Vote: I like it
  • +15
  • Vote: I do not like it

By natalina, 9 months ago, translation, In English

Hello, Codeforces!

On Jul/07/2023 17:35 (Moscow time) Codeforces Round 883 (Div. 3) will start.

You will be offered 8 problems, dedicated to the adventures of a restless mathematician, a programmer and just a funny character named Rudolf, and 2 hours 15 minutes to solve them. Problems have 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.

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. 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: vladmart, Sasha0738 and natalina.

We would like to thank:

  1. Vladosiya for coordinating the round.

  2. MikeMirzayanov for Polygon and Codeforces platforms.

  3. Sugar_fan for red testing.

  4. 74TrAkToR, zwezdinv,Sokol080808,senjougaharin, FEDIKUS, Lucina, vrintle for yellow testing.

  5. pavlekn, diskoteka, Phantom_Performer, bigDuck, Evirir for purple testing.

  6. KoT_OsKaR, HappyChau0v0, bugdone, Termii, t0rtik, Rudro25, O_E, jhorvat, sohelH for blue testing.

  7. ctraxxd, 666EGOR777, Guevara74, stefanbalaz2, jojonicho, hussein_auf for cyan testing.

Good luck!

UPD: Editorial is posted.

Full text and comments »

  • Vote: I like it
  • +112
  • Vote: I do not like it