~~Note: I can't figure out how to place the tutorials inside spoilers. If someone is familiar with how CF spoilers work and can help I would really appreciate it. For now, be warned that the tutorials are visible by default (but everything else isn't)~~

**UPD:** I figured out how to use spoilers! Also added implementations for all problems.

Thanks for participating in our contest!

Author: Kuroni

First solve: cfg0d at 00:01:02

**Hint**

**Tutorial**

**Comments from the authors**

Author: Ari

First solve: blue5002 at 00:04:51

**Hint**

**Tutorial**

**Comments from the authors**

Author: Ari

First solve: Dukkha at 00:05:32

**Hint 1**

**Hint 2**

**Tutorial**

**Comments from the authors**

Author: Ari

First solve (Div. 2): traxex2 at 00:22:48

First solve (Div. 1): tourist at 00:05:04

**Hint 1**

**Hint 2**

**Hint 3**

**Tutorial**

**Comments from the authors**

Author: Both of us!

First solve (Div. 2): shenmadongdong.qaq at 00:29:52

First solve (Div. 1): tourist at 00:08:19

**Hint 1**

**Hint 2**

**Hint 3**

**Tutorial**

**Comments from the authors**

Author: Kuroni

First solve (Div. 2): deepspacewaifu at 01:42:36

First solve (Div. 1): maroonrk at 00:33:17

**Hint 1**

**Hint 2**

**Hint 3**

**Hint 4**

**Tutorial**

**Comments from the authors**

Author: Ari

First solve: ksun48 at 00:57:13

**Hint 1**

**Hint 2**

**Hint 3**

**Hint 4**

**Tutorial**

**Comments from the authors**

Author: Kuroni

First solve: ecnerwala at 01:02:26

**Hint 1**

**Hint 2**

**Hint 3**

**Hint 4**

**Tutorial**

**Comments from the authors**

1508F - Оптимальное кодирование

Author: Kuroni

First solve: ecnerwala at 01:52:02 (The only contestant who solved this problem!)

**Hint 1**

**Hint 2**

**Hint 3**

**Hint 4**

**Hint 5**

**Hint 6**

**Tutorial**

**Comments from the authors**

Finally, here's some funny moments that happened while we were working on the round :)

**Memes**