### AquaMoon's blog

By AquaMoon, 3 months ago,

Thank you for participation and we hope you enjoy this round ヽ(^ o ^)/.

During the contest, there was a small issue in problem D. For those affected, we have skipped your duplicate submissions (if your duplicate submissions were not skipped, please let us know). We apologize again for any inconvenience caused.

In addition, we are honored to invite you to our unofficial round tomorrow (*╹▽╹*) Invitation to TheForces Round #22 (Interesting-Forces)

Idea : wuhudsm

Tutorial
solution

### 1864B-Swap and Reverse

Idea : Parisa_Amiri, chromate00

Tutorial
solution
bonus

Idea : wuhudsm

Tutorial
solution

Idea : AquaMoon

Tutorial
solution

Idea : wuhudsm

Tutorial
solution

### 1864F-Exotic Queries

Idea : ODT, AquaMoon

Hint
Tutorial
solution

Idea : AquaMoon

Hint1
Hint2
Hint3
Tutorial
solution

### 1864H-Asterism Stream

Idea : bogocubic1 Solution: Psychotic_D, amenotiomoi

Tutorial
solution

### 1864I-Future Dominators

Idea : Psychotic_D, amenotiomoi

Tutorial
solution

Feel free to ask if you have any questions! (*╹▽╹*)

• +201

By AquaMoon, 12 months ago,

Hello, Codeforces!

Winter holiday is coming! And we are excited to invite you to our third round, Polynomial Round 2022 (Div. 1 + Div. 2, Rated, Prizes!), which will be held on 17.12.2022 17:35 (Московское время). You are given 8 problems and 2.5 hours to solve them.

All problems were written and prepared by Ecrade_, Little09, ChthollyNotaSeniorious, DataStructures, Cirno_9baka, mejiamejia and me.

And thanks to dorijanlendvaj, gisp_zjz, gamegame, triple__a, Chenyu_Qiu, Suiseiseki, q-w-q-w-q, leukocyte, waaitg, Kubic, LHQing, RedLycoris, lucaperju, njupt_lyy, Kilo_5723, Huah, prvocislo, foreverlasting, thanhchauns2, Rhodoks, JohnVictor, Psychotic_D, VinstaG173, dannyboy20031204, 4qqqq, CoupDeGrace, wsyear, 5ab, Lavine, absi2011, UtopianZ for testing and good advice, antontrygubO_o for his excellent round coordination and help with preparation and MikeMirzayanov for great systems Codeforces and Polygon.And you, for participating!

This is our third round! Although you may find members in our team and testers who helped are not the same as the past, our permanent love and enthusiasm for coding will not change. Conspicuously, great efforts have been put in it. We are sincerely looking forward to your participation and we hope everyone will enjoy it. Besides, this round is sponsored, which indicates that everyone has an opportunity to get the prize!

UPD1: Here is the score distribution:

500 — 1000 — 1500 — 1500 — 2000 — (1500 + 1000) — 3250 — 4000

UPD2: Sorry to everyone! We must apologize because the pretest of B is not strong, leading to FST for many people. It is our fault! We don't want to make excuses. This time, we did a bad job and let everyone down. We all blamed ourselves sadly. Although we have invited a lot of testers but most of them passed all the tests, and even some of them get 'WA', they fixed their code and passed it. So we didn't pay too much attention to it -- we thought it was 'normal'. However, we didn't suppose the pretests were so weak that lots of participants get FST. Sorry again! (>_<)

And personally, firstly, I must apologize to all of you. I let you down this time. I blamed myself sadly. And I accept all the critical opinions. However, secondly, I know that you must feel angry when you find your B got FST, and that's all our fault, but because my birthday is coming, I intended to use this contest to record the growth of me and my team members, as well as my happy memories on codeforces, so could you please don't scold me too harshly when criticizing me? (Actually I am crying when typing this words; I blamed myself sadly when I saw lots of FST). I will regard all your comments as the most valuable things which urge me to become a better person and help me grow to a more mature person, but maybe I will be very painful if I see comments or messages as 'you are a trash''trash round'. (⑉꒦ິ^꒦ິ⑉)

Sorry! We did a bad job because of our carelessness this time, but we promise we will try our best to improve our comprehensive abilities, and bring a better round next time! We will keep in mind every word of encouragement and criticism, which is the driving force for our growth. Wish you happy everyday! (•ω•)

UPD3: Tutorial is available.

Thanks for all the warmth and kindness!!! I felt deeply guilty during the past few hours, now I feel better. I really appreciate your warmth and kindness!!! (●'◡'●)

We made the contest just because we would like to share our interesting ideas with you. If you like any of the ideas, we will be very delighted!!! o(≥ω≤)o

UPD4:Congratulations to the winners

And for my personal gifts: the two random number is 91 and 1028, so congratulations to sd0061 and regain0001!!! (The rank contained the virtual participants at that time, which improves randomness, only if the time and the rank both accorded with the number , you can get the gifts!!!) o(〃'▽'〃)o

Thanks to all the warmth and kindness!!! You really light up my heart!!! We will try our best next time and prepare a better round to share our interesting ideas with you!!! ✧⁺(๑•ω•๑)⁺✧

And here is the information from our title sponsor:

Prizes

The participants who end up in the first 255 positions will receive prizes. The participant on the first place will receive $256, the next two participants will receive$128, the next four participants will receive \$64, etc. Prizes will be distributed in OP (Optimism) tokens.

Polynomial is building in decentralized finance – a more fair, accessible, efficient, and transparent financial system enabled by crypto. Polynomial automates financial derivative strategies to create products that deliver passive yield on various assets. Polynomial Earn is the first DeFi Options Vault (DOV) that executes completely on-chain by selling options directly to an AMM.

If you have a background in mathematics or software engineering and a knack for problem-solving, we want to hear from you. You will have the opportunity to work on cutting-edge technology and tackle complex problems alongside a talented and driven team.

Contact form →

By joining us at this early stage, you will make fundamental decisions that will shape the course of Polynomial. We prefer passionate, quick learners with a history of excellence.

Find out more about us on our website polynomial.fi or texting rivalq.

If you wish to be part of our remote-first team or apply for an internship, please fill in the form or email [email protected]. Make sure to apply before Dec 20, 2022.

We wish everyone good luck and have a positive delta!

• +351

By AquaMoon, 16 months ago,

Hello, Codeforces!

A wonderful summer holiday! After College Entrance Examination, we are extremely delighted to invite you to our second round, CodeTON Round 2 (Div. 1 + Div. 2, Rated, Prizes!), which will be held on Jul/31/2022 17:05 (Moscow time). Note the unusual start time of the round.You are given 8 problems and 2.5 hours to solve them.

All problems were written and prepared by Cirno_9baka, CoupDeGrace, Heltion, ODT, Yakumo_Ran, farmerj, flowerletter, izlyforever, kuangbin, mejiamejia, ugly2333 and me.

Task statements and editorials will also be available in Chinese (Simplified) and Chinese (Traditional) after the contest.

We are sincerely thankful for the help provided by:

This is our second round! Great efforts have been put in during the past year. We are sincerely looking forward to your participation and we hope everyone will enjoy it. Besides, this round is sponsored, which indicates that everyone has an opportunity to get the prize!

Good luck!

UPD1: Here is the score distribution:

500-750-1250-1750-2000-2750-3500-(2250+2750)

UPD2:Tutorial is available.

UPD3: Simplified Chinese tutorial is available.

UPD4: Traditional Chinese tutorial is available.

UPD5: Congratulations to the winners

And here is the information from our title sponsor:

Hello, Codeforces!

We, the TON Foundation team, are pleased to support CodeTON Round 2.

The Open Network (TON) is a fully decentralized layer-1 blockchain designed to onboard billions of users to Web3.

Since July, we have been supporting Codeforces as a title sponsor. This round is another way for us to contribute to the development of the community.

The winners of CodeTON Round 2 will receive valuable prizes.

The first 1,023 participants will receive prizes in TON cryptocurrency:

• 1st place: 1,024 TON
• 2–3 places: 512 TON each
• 4–7 places: 256 TON each
• 8–15 places: 128 TON each
• 512–1,023 places: 2 TON each

We wish you good luck at CodeTON Round 2 and hope you enjoy the contest!

• +1308

By AquaMoon, history, 2 years ago,

Hello, Codeforces!

I'm glad to invite you to Codeforces Round 732 (Div. 1) and Codeforces Round 732 (Div. 2), which will be held on Jul/11/2021 17:05 (Moscow time). Note the unusual start time of the round.

The round will be rated for both divisions. Each division will have 6 problems and 2.5 hours to solve them. There may or may not be an interactive problem, so I suggest you should read the guide for interactive problems.

All problems were written and prepared by CoupDeGrace, kuangbin, mejiamejia, Heltion, Melacau, Nanako, GOATWU, Cirno_9baka, Suiseiseki, ODT, box, Ynoi, syh0313, wh0816 and me.

And thanks to QAQAutoMaton, gamegame, starusc, interestingLSY, chenkuowen, DataStructures, Monogon, ijxjdjd, Schwarzenegger, sunsiyu, Nezzar, mana, TheOneYouWant, gyz_gyz, kimoyami, njupt_lyy, ptd, coderz189, manik.jain, absi2011, gyh20, errorgorn, antontrygubO_o, oolimry, zhangzx123, wxhtzdy, tribute_to_Ukraine_2022, SonDinh, triple__a, Pecco, AzusaCat, dorijanlendvaj, Imakf, Forever_Pursuit, kartikeyasri23 for testing and good advice, isaf27 for his excellent round coordination and help with preparation and MikeMirzayanov for great systems Codeforces and Polygon.And you, for participating!

This is my first round ever. Great efforts have been put in during the past six months. We are sincerely looking forward to your participation. We hope everyone will enjoy it.

Good luck!

UPD1: Here's the score distribution:

Div 1: 500 — 1000 — 1500 — 2250 — (2000+2000) — 4000

Div 2: 500 — 1000 — 1250 — 1750 — 2250 — 3000

UPD2: Sorry to everyone! This is my first round and I spent lots of time to prepare it. I prepared at least 23 problems, and chose these eight ones for this round. I invited 35 testers to test, and chose problems according to their feedback. However, the difficulty is more than expect.And the pretest is not strong, leading to FST for many people. I blamed myself sadly. So I must say sorry to you, my dear friends. I will improve myself in the future. Wish you good luck and happy everyday. (๑•ᴗ•๑)

UPD3: Tutorial is available.

UPD4: Congratulations to the winners

Div1:

1.gisp_zjz

3.xtqqwq

4.Swistakk

Div2:

1.ki_msaga

2.jk-jung

• +1175