Hello Codeforces! （你好，代码部队）

We are glad to invite you to participate in Codeforces Round 872 (Div. 1) and Codeforces Round 872 (Div. 2) on 08.05.2023 15:05 (Московское время). Please note the unusual start time.

This round is rated for all the participants. You will be given 5 problems (one of which is divided into two subtasks) and 2 hours to solve them in each division.

Assume you are YuezhengLing, and in this round, your best friend LuoTianYi will give you several problems to solve.

(LuoTianYi is the left one and YuezhengLing is the right one)

We would like to thank:

1. RedLycoris, CrTsIr, Gyy_cj, SanweiTreap and Atomic-Jellyfish for writing the problems.

2. Artyom123 for coordinating the round.

3. MikeMirzayanov for great Codeforces and Polygon platforms.

4. He_Ren, orzdevinwang for our red suns testing the round.

5. Qingyu, zimpha, themoon, Crying, rui_er, Kevin114514, Lynkcat, lgswdn, FreshP_0325, Umi for red testing the round.

6. KbltQaQ, LHQing, Forever_Pursuit, NemanjaSo2005, geospiza, Kohaku, maoweishou, welleyth, EasonTAO, Rushroom, Gheal, rsj for orange testing the round.

7. Error_Yuan, fishy15, Lyrically. valeriu, yash_0402, smokebellew for purple testing the round.

8. LRL65, ayhan23, Zhangxuyang, Koful123, playerr17, AhmedEzzatG for blue testing the round.

9. zhy137036 for green testing the round.

10. tibinyte for gray testing the round.

11. You

    for participating in this round.

UPD: Scoring distribution:

Div.1: 500 – (500+750) – 1750 – 2250 – 3000

Div.2: 500 – 1000 – 1500 – (1000+1250) – 2750

UPD: Editorial is available here