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By Nanako, 14 months ago, In English

1770A - Koxia and Whiteboards

Idea by m_99

Hint 1
Hint 2
Hint 3
Solution
Code (m_99)

1770B - Koxia and Permutation

Idea by m_99

Hint 1
Hint 2
Solution
Code (Nanako)

1770C - Koxia and Number Theory

Idea by triple__a

Hint 1
Hint 2
Hint 3
Hint 3.5
Hint 4
Solution
Code (Nanako)

1770D - Koxia and Game

Idea by m_99

Hint 1
Hint 2
Hint 2.5
Hint 3
Solution
Code (Nanako, DSU)
Code (zengminghao, DFS)

1770E - Koxia and Tree

Idea by m_99

Hint 1
Hint 2
Hint 2.5
Hint 3
Solution
Code (Nanako)

1770F - Koxia and Sequence

Idea by m_99

Hint 1
Hint 2
Hint 3
Hint 4
Hint 5
Hint 6
Solution
Code (errorgorn)

1770G - Koxia and Bracket

Idea by huangxiaohua and errorgorn

Hint 1
Hint 2
Hint 3
Hint 4
Solution
Code (errorgorn)

1770H - Koxia, Mahiru and Winter Festival

Idea by SteamTurbine

Hint 1
Hint 2
Preface
Solution (sketch)
Solution (details)
Code (SteamTurbine)
Visualizer (Python script)

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By Nanako, 14 months ago, In English

"It's been a long time since I came here, and I've really been through a lot." Koxia muses as she chatted idly with Mahiru.

Now that the Winter Festival is approaching. Among the flash of fireworks, in the chimes of the New Year, what is waiting for them to encounter?

Armed with girlish courage, they stepped onwards.

Koxia, Mahiru and Winter Festival

Hello Codeforces!

We (Nanako, m_99, huangxiaohua, SteamTurbine, triple__a, Nezzar) are very pleasured to invite you to take part in Good Bye 2022: 2023 is NEAR, which will take place in Dec/30/2022 17:35 (Moscow time)!

This round consists of 8 tasks waiting for you to solve in 150 minutes, and will be rated for everyone!

On behalf of the author team, please allow me to express our sincere thanks to:

This round is supported by NEAR. The participants in the top 2047 places will receive prizes as follows:

  • Ⓝ 1024 for the first place
  • Ⓝ 512 for the 2-3 places
  • Ⓝ 256 for the 4-7 places
  • ...
  • Ⓝ 1 for the 1024-2047 places

Score distribution will be announced soon.

Besides the regular editorial, materials to be public after the round will also include the Chinese statement and the Chinese editorial.

We hope you enjoy our problems and say Goodbye to your 2022 happily!

UPD1: Score distribution is 500 — 750 — 1250 — 1500 — 2000 — 2500 — 3250 — 4000.

UPD2: Congratulations to the winners!

  1. Benq
  2. maroonrk
  3. Radewoosh
  4. Um_nik
  5. tourist
  6. ksun48
  7. ecnerwala
  8. aaaaawa
  9. DearMargaret
  10. jiangly

Thanks all for joining!

UPD3: The editorial is available.

UPD4: The Chinese statement and the Chinese editorial have been added into the contest attachments.

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