## DMOPC '20 November Contest

Welcome to the second DMOJ Monthly Open Programming Competition of the 2020-2021 season!

The problem writers this time are richardzhang, Kirito, PrimeNet and zhouzixiang2004.

Please note that this contest will be full feedback.

Please note that this contest will have a different tiebreaking scheme from earlier contests. (See below for details.)

This round will be rated for all participants.

Before the contest date, you may wish to check out the tips and help pages.

This contest will consist of 6 problems, the difficulty of which may range anywhere from CCC Junior to CCO level.

Some problems offer partial marks in the form of subtasks. If you cannot solve a problem fully, we encourage you to go for these partial marks.

You will have 3 hours to complete the contest. After the contest window begins, you may begin at any time. Once you enter the contest, your personal timer will start counting down and you will be able to submit until 3 hours from when you started, or until the hard deadline (00:00:00 EST of December 7th), whichever comes first.

After joining the contest, you proceed to the Problems tab to begin. You can also go to Users if you wish to see the rankings.

We have listed below some advice as well as contest strategies:

• Ties will be broken by the sum of submission times. The last submission to each problem will be used.
• It is not guaranteed that the problems will be in order of increasing difficulty. Reading all of the statements is recommended.
• Remove all extra debugging code and/or input prompts from your code before submitting. The judge is very strict — most of the time, it requires your output to match exactly.
• Do not pause program execution at the end. The judging process is automated. You should use stdin / stdout to perform input / output, respectively.
• It is guaranteed that all the problems will be solvable with C++.

Clarification requests for the contest must be routed through the clarification system provided on DMOJ, and not through other channels including but not limited to Discord and Slack. Furthermore, all clarification requests will be handled the way they normally are in IOI. Note that, in particular, clarification requests must come in the form of yes/no questions.

Due to rampant issues with cheating on contests that has happened recently, any suspicious behavior during the contest window may result in your rating being impacted negatively. Such behavior includes, but is not limited to:

• Registering for the contest with at least two accounts.
• Participating in the contest with an account that is not your primary account.
• During the contest window, talking about the contest in more detail than answering a yes/no question about whether one participated in the contest. This includes, but is not limited to, posting spoilers about the contest and public speculation of the contest.
• Attempting to exploit bugs in the platform to subvert the constraints of the contest.

Punishments may include performance being unrated or, for more serious infractions, being forcibly ranked at the bottom of the scoreboard.

At the end of the contest, you may comment below to appeal a judging verdict. In the case of appeals, the decision(s) of DMOJ staff is final.

• commented on Dec. 8, 2020, 4:44 p.m.

Will there be editorials for the other problems?

• commented on Dec. 9, 2020, 2:09 p.m.

Yes. We're working on editorials for P1 ~ P4.

• commented on Dec. 7, 2020, 6:20 p.m. edited

To the DMOJ Staff and the participants, I genuinely apologize for collaborating with someone else during the contest. To clarify, BrayBray123 is my brother, who also did the contest in the same room as I did (at the same time). During the contest, we were naturally collaborating in the intensity of the moment and did not think twice about our actions. Again, I do apologize on behalf of my and my brother's actions. In the future, we'll promise such a situation will never happen again.

• commented on Dec. 7, 2020, 6:34 p.m.

Are you 👈 kidding 👎 ??? What the **** are you 👈 talking 🗣 about 😎💦 man 👦 ? You 👈 are a biggest 😍 looser i 👁 ever 😠 seen 👀 in my life 💓 ! You 👈 was doing PIPI in your 💩👈🏻 pampers when ⏰ i 👁 was beating 💓 DMOJ users 🎮 much 😩😂🙀 more stronger 💪💯 then you 👈! You 👈 are not proffesional, because proffesionals knew 👓 how to lose 🏳 and congratulate 👍👌👎 opponents 👉✋, you 🅱👈🍆 are like 👍👌😍 a girl 👧😍🍑 crying 😭 after 👀 i 👥 beat 🤜🏻👊🏻 you 👉! Be brave 💪😎, be honest ❎ to yourself and stop ❌🚫 this trush talkings 👄🗣!!! Everybody 👥 know 🤔 that i 👁👄 am very 👌 good 👌❤ competitive ⚰🤷 programmer 🎮🎽, i 👁🚫 can win 🏆💸 anyone 🙋 in the world 🌎🌍🌏 in single ☝ contest 🎮! And "d"moj 🕴🏿 "a"dmins is nobody 🙅🏽 for me, just a people 🎮 who are crying 😭 every 💯 single 🏻 time ⏰ when ⏰ i do well 😂, ( remember 🤔 what you 👈 say 💬 about 💦 AQT ) !!! Stop 🙅🏼⛔🚫 playing 🎮 with my name 📛, i 👥 deserve 👌🏻 to have a good 👍 name 📛 during whole 💦 my CP 🌝 carrier 🍛🔛, I 👁 am Officially 🏢 inviting 🇮🇪 you 👉🏻👤 to Codeforces lockout ⚰🤷 duel 🔥 with the Prize 😛 fund 💸! Both of us 🇺🇸 will invest 💰 5000 💯📆\$ and winner 🏆 takes 👊 it all 💯!

I 👁 suggest 👀 all 💯 other people 👫 who's 📛 intrested in this situation 🎮, just take 💅 a look 👀 at my results 👀💯 in WAC5 ☑📈 and DMOPC '19 April 🌍🌿🐖 DM::OJ ⚰🤷 Rated 🌍 contests 🏆💯, and that should be enough 💦... No 🚫 need 👉 to listen 👂 for every ☝ crying 😢 babe 👶, Wangster is always 🔥 play 🎮 Fair 👒 ! And if someone 👤 will continue ⏩ Officially 🗽 talk 🗣✅ about 💦 me like 💖 that, we will meet 🤝 in Court 🏛! God 😇 bless ✨ with true 💯! True 💯 will never 🙅 die 💀 ! Liers will kicked 😠☠ off 📴...

• commented on Dec. 7, 2020, 8:35 p.m. edited
• commented on Dec. 7, 2020, 7:16 p.m. edit 2

I see we have a chess buff on our hands.

• commented on Dec. 6, 2020, 10:00 p.m.

When I grow up, I want to be like RonldLiu.

• commented on Dec. 6, 2020, 9:10 p.m. edited

RonldLiu is so cute and smart! <3 orz orz orz

• commented on Dec. 6, 2020, 9:19 p.m.

アカウント名は大体同じですが、あいつは気づかれずにすることが出来ると思った wwwwwww

お可愛いこと。。。

• commented on Dec. 6, 2020, 6:33 p.m. edited

Interesting Quotes from RonldLiu in DMOJ HUB from like early November
"I'm grade 11 and I'm trying to make IOI next year"
"I have 200IQ" (This man genuinely thinks he has 200IQ)
"the hardest S5 are like 20 points so I just have to be able to solve 20 point questions to make IOI not very hard"
"I'm going to solve all the S1 this week, all the S2 next week, all the S3 next next week, all the S4 next next next week, and all the S5 the week after"
"My school average is like 80" (He's trying to apply to US btw)

I just want to ask if you really thought that you were gonna get away with submitting on a second account with very similar names. I'm really disappointed by your thought process here. Last time I talked to you, I asked you to read about this but I think you read it upside down. So I'm going to request that you read it not upside down a second time and educate yourself because you somehow believe that everyone on DMOJ is an idiot. It's for your own good. :)

• commented on Dec. 6, 2020, 9:31 p.m.

• commented on Dec. 6, 2020, 6:43 p.m.

• commented on Dec. 6, 2020, 6:39 p.m.

Based

• commented on Dec. 6, 2020, 6:27 p.m. edited

Break time is over! Stop playing games! Stop playing on your phones! Stop watching OurTube!

• commented on Dec. 6, 2020, 6:34 p.m.

Looks like my rating is getting redistributed 🤑🤑

• commented on Dec. 6, 2020, 6:44 p.m.

• commented on Dec. 6, 2020, 6:50 p.m.

:(

• commented on Dec. 6, 2020, 3:13 p.m.

RonldLiu has a Big Brain

• commented on Dec. 2, 2020, 8:12 a.m.

Ties will be broken by the sum of submission times. The last submission to each problem will be used.

Does the "last submission" refers to the latest of all submissions to one problem (including submissions after the first AC) or the latest of all submissions before and include the first AC? If I submit a non-AC solution after AC'd in one problem, will it (possibly) affect my ranking?

• commented on Dec. 2, 2020, 11:36 a.m.

Yes, it includes submissions after the first AC.

• commented on Nov. 29, 2020, 3:55 p.m.

November in December :blobglare:

• commented on Dec. 2, 2020, 9:52 a.m.

The dmoj admins haven't learnt the months of the year yet.

• commented on Dec. 5, 2020, 12:05 a.m.

Well... does anyone even remember what the date is during the pandemic?

• commented on Dec. 6, 2020, 1:13 p.m.

I only know today is the 36th day of NNN