### Supermagzzz's blog

By Supermagzzz, 2 years ago, translation,

Hello, Codeforces! Were you afraid of the lack of contests? We also!

Unfortunately, due to technical problems, the round is declared unrated. You can continue to solve problems, but the results of the current round will not affect your rating. We are sorry for this situation.

<almost-copy-pasted-part>

Hello! Codeforces Round #697 (Div. 3) will start at Jan/25/2021 18:00 (Moscow time). You will be offered 7 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. However, all of you who wish to take part and have a rating 1600 or higher, can register for the round unofficially. The round will be hosted by rules of educational rounds (extended ICPC). Thus, during the round, solutions will be judged on preliminary tests, and after the round it will be a 12-hour phase of open hacks. I tried to make strong tests — just like you will be upset if many solutions fail after the contest is over.

You will be given 7 problems and 2 hours to solve them.

Note that the penalty for the wrong submission in this round (and the following Div. 3 rounds) is 10 minutes.

Remember that only the trusted participants of the third division will be included in the official standings table. As it is written by link, this is a compulsory measure for combating unsporting behavior. To qualify as trusted participants of the third division, you must:

• take part in at least two rated rounds (and solve at least one problem in each of them),
• do not have a point of 1900 or higher in the rating.

Regardless of whether you are a trusted participant of the third division or not, if your rating is less than 1600, then the round will be rated for you.

The problems for this round were invented by MikeMirzayanov and prepared by me Supermagzzz and Stepavly

Thanks to MikeMirzayanov for platforms and coordination of our work. Thanks to darkkcyan, Tzak, bfs.07, songsinger, iankury, spookywooky, Programmer, sodafago, infinitepro for help in round preparation and testing the round.

Good luck!

</almost-copy-pasted-part>

• +244

| Write comment?
 » 2 years ago, # |   +36 7 Problems!!! Great.
•  » » 2 years ago, # ^ |   +11 Contest start's 15 minutes late
•  » » » 2 years ago, # ^ |   +4 why?
•  » » » » 2 years ago, # ^ |   +1 looks like there was some issue with the servers. the site was showing unavailable for me for some seconds.
•  » » » » » 2 years ago, # ^ |   +22 Codeforces teaching us how recursion looks like
•  » » » » » 2 years ago, # ^ |   0 10 more minutes late cant wait to start
•  » » » » » » 2 years ago, # ^ |   0 A small suggestion, keep an tab open of m1.codeforces.com aside. It might help.
•  » » » » 2 years ago, # ^ |   +6 29000 registrations!! they must be adding some resources
•  » » » » 2 years ago, # ^ |   +18 Maybe they are waiting for the number of registered participants to cross 30k :0
•  » » » 2 years ago, # ^ | ← Rev. 4 →   -73 was fully set to give the contest and the enthusiasm drops down immediately after hearing of delay.Need to think of something to pass time now.Hope to get some upvotes to increase the enthusiasm
•  » » » » 2 years ago, # ^ |   -6 please dont do this to me this is my first comment
•  » » » » » 2 years ago, # ^ |   +2 lmao
•  » » » » » 2 years ago, # ^ |   +5 Nope
•  » » » 2 years ago, # ^ |   +6 Again??
•  » » » 2 years ago, # ^ |   +8 10 more now
•  » » » » 2 years ago, # ^ |   0 why is this happening?
•  » » » » » 2 years ago, # ^ |   +3 Making New record of 30k+ coders
•  » » » 2 years ago, # ^ |   0 again late, but what's wrong ?
•  » » 2 years ago, # ^ | ← Rev. 2 →   -15 contest delayed by 15 minutes update:10 minutes more to go
•  » » » 2 years ago, # ^ |   0 but why??
•  » » » » 2 years ago, # ^ |   0 beacuse they can't check all submissions in time :)
•  » » » » » 2 years ago, # ^ | ← Rev. 2 →   0 nothing
•  » » » » » » 2 years ago, # ^ |   +3 think about your statement for a few minutes...
•  » » 2 years ago, # ^ | ← Rev. 2 →   -12 This is my first contest on codeforces, just got delayed :(
•  » » » 2 years ago, # ^ |   0 good luch to u
•  » » » » 2 years ago, # ^ |   +5 yeah u cant even give them luck dude they are doomed
•  » » » 2 years ago, # ^ |   +1 My first two contests got unrated due to server problem
•  » » » 2 years ago, # ^ |   0 You are so "lucky" :(
•  » » 2 years ago, # ^ |   +4 My goodness. See the crowd!! It's highest among all contests that held in cf. Congo cf!
•  » » 2 years ago, # ^ |   0 3 mins to go!!! I hope it doesn't get delayed any further :(
•  » » » 2 years ago, # ^ |   +9 lol, it got delayed
•  » » » 2 years ago, # ^ |   0 Please dont say that again now
•  » » 2 years ago, # ^ |   +2 Contest start's next 10 minutes late
•  » » » 2 years ago, # ^ |   0 Can't wait more!!
•  » » 2 years ago, # ^ |   0 Is Mike waiting for 30,000 registrations?
•  » » 2 years ago, # ^ |   0 100 participants more to cross 30k. :)
 » 2 years ago, # |   +60 As a tester I would like to thank iankury for providing clear explanation.
 » 2 years ago, # |   +191
 » 2 years ago, # |   +12 Some brazilian testers, this is great!
 » 2 years ago, # |   0 Hope this contest will increase our rating!! Finger crossed.
•  » » 2 years ago, # ^ |   +5 I will try my best to reach pupil today. All the best to all participants.
 » 2 years ago, # |   +6 I was afraid, but why that happened? contest frequency is decreased this month than other months.Thanks for the contest.
 » 2 years ago, # |   +8 My chance for pupil!
•  » » 2 years ago, # ^ |   0 My chance for expert!
•  » » » 2 years ago, # ^ |   +1 My chance for specialist
•  » » » » 2 years ago, # ^ |   +14 my chance to get rated lol
•  » » » » » 2 years ago, # ^ |   +10 My chance for pupil!
•  » » » » » » 2 years ago, # ^ |   0 My chance for recover lost rating in last contest.
•  » » » » » » » 2 years ago, # ^ |   0 my chance for experiencing twice delaying of Codeforces
•  » » » » » » » 2 years ago, # ^ |   +1 Its 8:25 and I'm still waiting for my chance
 » 2 years ago, # |   +16 How can I become a tester for Div. 3 contests if I am not a friend of the testers/setters?
•  » » 2 years ago, # ^ |   +37 I am not a friend of either of them. I think it's pure random ;)
•  » » » 2 years ago, # ^ |   +8 Thanks for your reply!Since I am less likely to give CP contests in the following few months, it would be nice for me to contribute to the CP community by becoming a tester for Div. 3 contests.I would want to become a Div. 3 contest tester in the future — if Stepavly and Supermagzzz would want me to provide feedback for your contests, please give me a call!
•  » » » » 2 years ago, # ^ |   +14 Well, this time each tester has a ten years badge.
 » 2 years ago, # | ← Rev. 2 →   -17 .
 » 2 years ago, # |   +117 .
•  » » 2 years ago, # ^ |   +7 I am waiting for a div2 round
•  » » » 2 years ago, # ^ |   +24 I am waiting for a div2 round that is unrated for me :)
 » 2 years ago, # |   +2 7 problems! Wonderful start after an eternal gap.
 » 2 years ago, # |   0 Are the registrations closed??
•  » » 2 years ago, # ^ |   0 No,You can register for the contest.
 » 2 years ago, # |   +3 if i don't get 150+ rating i will do whatever the highest rated reply asks.
•  » » 2 years ago, # ^ |   -9 What is Obama last name?
•  » » » 2 years ago, # ^ |   +29 is that even a question? Obama's last name is ofc Obama, you idiothis first name is President
•  » » » » 2 years ago, # ^ | ← Rev. 2 →   +10 Oh, I thought his last name was gon.
•  » » » 2 years ago, # ^ |   +18 "Care" of course
•  » » 2 years ago, # ^ |   +4 Solve CF problems at least 3 hours/day for 1 year.
•  » » 2 years ago, # ^ |   +33 please give me money
•  » » » 2 years ago, # ^ |   +1 Deal.
•  » » » » 2 years ago, # ^ | ← Rev. 2 →   +19 We will watch this battle with great interest.Edit: welp, this would be a disappointing result I guess.
•  » » » 2 years ago, # ^ |   +3 our money
•  » » 2 years ago, # ^ |   +10 get 150+ rating
•  » » 2 years ago, # ^ | ← Rev. 3 →   +4 ugh, but i guess it doesn't count since my statement is technically incorrect?
•  » » » 2 years ago, # ^ |   0 What extension or script do you use to highlight submissions based on language?
•  » » » » 2 years ago, # ^ |   +1 Codeforces Enhancer
•  » » » » » 2 years ago, # ^ |   0 Would you please provide me the link or more details about is.
•  » » » » » » 2 years ago, # ^ |   0 google it on chrome's store.
•  » » » » » » 2 years ago, # ^ |   +1
 » 2 years ago, # |   -104 I am sure nobody likes to see this.
•  » » 2 years ago, # ^ | ← Rev. 2 →   +99 Yes We all know that.
 » 2 years ago, # |   0 I don't like seeing <"almost-copy-pasted-part>"
•  » » 2 years ago, # ^ |   +5 That Irregular Bracket Sequence :V
•  » » » 2 years ago, # ^ |   +9 As you can observe now, its_Atrap
 » 2 years ago, # |   +45 As a tester, I recommend participants to open https://codeforces.com/contest//problems rather than opening each problem page, during the contest.Reduces clutter and server load (ig).
•  » » 2 years ago, # ^ |   0 Thanks sir, for this new bit of information.
•  » » 2 years ago, # ^ | ← Rev. 2 →   0 Can u tell us where we can find the contest-id for contest before the start of the contest Thank you
•  » » » 2 years ago, # ^ | ← Rev. 5 →   +3 Enter any contests and you can find the contest-id in the URL.Edit: You can still find the contest-id in the /contestRegistrants route by clicking and it is 1475 for this contest. Luckily, the id gets incremented by one in each contest but you can't enter the contest before it starts.
•  » » » » 2 years ago, # ^ |   0 Actually there are two more or less direct links:This one links to the contest, but currently forwards to this blog, since the contest has not been started yet: https://codeforces.com/contest/1475 and is equivalent to the inline link Codeforces Round #697 (Div. 3)That one links to the page where you can register for the contest:https://codeforces.com/contests/1475That second link is also used in Calendar
•  » » » » 2 years ago, # ^ |   +2 damn it i just got rick rolled
•  » » » » » 2 years ago, # ^ |   0 the real rick roll is in the delays
 » 2 years ago, # |   +11 Thanks to Supermagzzz and Stepavly for preparing the div.3 contest.
 » 2 years ago, # |   0 After the last contest when it was showing no contest for near future, it was a little bad feeling but now this contest has filled us with new enthusiasm(mind the spellings).
 » 2 years ago, # |   +3 Hoping for less plagiarism in the contest!
 » 2 years ago, # |   +13 Hello everyone its the first div3 of this year and i am here to wish you all good luck for today. Have fun guys.
•  » » 2 years ago, # ^ |   +1 It is the Second. 1st was #693
 » 2 years ago, # |   0 Hoping for a great contest.
 » 2 years ago, # |   +5 anyone having difficulties reaching codeforces ?
•  » » 2 years ago, # ^ |   +1 No, It's working fine for me.
 » 2 years ago, # |   +3 This round has got a crazy number of registrants ~26000, let's hope the round goes smoothly
•  » » 2 years ago, # ^ |   +1 I already can't visit codeforces.com but I can visit this blog for some reason
•  » » » 2 years ago, # ^ |   +3 I think they postponed the starting time.
 » 2 years ago, # |   0 Wish the pretest becomes strong.
 » 2 years ago, # | ← Rev. 2 →   +36 To all my Indian brothers and sisters Happy Republic Day in Advance. 26th of January is celebrated as Republic Day in India to mark the day when the Constitution of India came into effect. JAI HIND
 » 2 years ago, # |   +30 Delayed. :(
 » 2 years ago, # |   0 28k people o_o
•  » » 2 years ago, # ^ |   +3 I don't even know if that's good or bad lol
 » 2 years ago, # |   -9 3 2 1 .....burrrr!
 » 2 years ago, # |   0 oh no contest was delayed for 15 mins :(
 » 2 years ago, # |   +3 Dude, 28000+ registrations already, is this the highest up until now ?
 » 2 years ago, # |   0 Best of Luck Everyone. I wish you all get green in first try:)
•  » » 2 years ago, # ^ |   +1 thank you i would definitely get green
 » 2 years ago, # |   +5 15 minutes delayed. Drink some water to keep yourself hydrated.
 » 2 years ago, # |   +11 delay is better than unrated.
•  » » 2 years ago, # ^ |   +8 I hope not both :D
•  » » 2 years ago, # ^ |   0 :/ both
 » 2 years ago, # |   +9 Hope the delay is for good cause. Submissions to be judged fast
 » 2 years ago, # |   +28 garam kar k thanda hi chor diya
 » 2 years ago, # |   +1 waiting for 30k?
 » 2 years ago, # |   0 For a few seconds, I thought that problems are repeated:)
 » 2 years ago, # |   +13 To All the Indians Happy Republic Day in Advance.
 » 2 years ago, # |   +7 This round is approaching 30,000 participants. This is year's first div 3, right ? Looks like some people are taking their new year's resolution seriously :P
 » 2 years ago, # |   +5 My goodness. See the crowd!! It's highest among all contests that held in cf. Congo cf!
 » 2 years ago, # |   +3 Delayed by 15 minutes. And now I am spending time in the comments section.
 » 2 years ago, # | ← Rev. 2 →   -33 deleted
•  » » 2 years ago, # ^ | ← Rev. 2 →   +10 Ok, Done.
 » 2 years ago, # |   +1 Is it the most popular round?Have Fun & Good Luck!
 » 2 years ago, # |   +9 with that many registrants if i get 3000th position I should be proud
 » 2 years ago, # |   +179 Sorry for the delay.
•  » » 2 years ago, # ^ |   -61 No, how could you do that to us. :p
 » 2 years ago, # |   -51 HAPPY REPUBLIC DAY TO ALL MY INDIAN BROTHERS AND SISTERS IN ADVANCE**** **** JAI HIND
•  » » 2 years ago, # ^ |   +1 and what about non-indians?
•  » » » 2 years ago, # ^ |   +6 You all can celebrate man...we beleive in Vasudhaiva Kutumbakam which means whole word is our family :)
 » 2 years ago, # |   0 I was waiting this contest. Good luck geeks!
 » 2 years ago, # | ← Rev. 2 →   +69 I am excited to see what SecondThread will be doing in these 15+10 minutes in his stream.
 » 2 years ago, # |   +5 The servers seem to be struggling...
 » 2 years ago, # |   +34 Me After Seeing The Delay:-
•  » » 2 years ago, # ^ | ← Rev. 2 →   +5 25 mins late**
•  » » 2 years ago, # ^ |   0 Nightmare scenario :D
•  » » 2 years ago, # ^ |   +3 movie name?
 » 2 years ago, # |   +14 All the best MikeMirzayanov. 30k incoming!!!!
 » 2 years ago, # |   +9 Highest registered participants.
 » 2 years ago, # | ← Rev. 3 →   +11 Congratulations CF on achieving a milestone of 29k participants.
 » 2 years ago, # |   +13 another delay?
 » 2 years ago, # |   +4 Delayed 10 more minutes ?
•  » » 2 years ago, # ^ |   +13 Could have had my dinner in 25 mins :( Skipped it for contest
•  » » » 2 years ago, # ^ |   +30 I controlled my shit
 » 2 years ago, # |   +10 Instead of delaying they should close the registration lol.
 » 2 years ago, # |   0 How come again a delay?
 » 2 years ago, # |   +2 Again it's delayed by 10 mins!!!!!
 » 2 years ago, # |   0 I think that reason of this delay is good skill for getting more and more participants
 » 2 years ago, # |   +8 Again delayed :(
 » 2 years ago, # |   +4 What is going on??
 » 2 years ago, # |   0 Why delayed again?
 » 2 years ago, # |   +2 Waiting for 30k ?
 » 2 years ago, # |   0 8:30 ??
 » 2 years ago, # |   +17 It seems it will be delayed until half of the participants go to sleep and we will deal with a normal number of participants.
•  » » 2 years ago, # ^ |   +4 nice joke, but staff of codeforces is not laughing now
 » 2 years ago, # |   0 I think they will delay it until 30k people register:)
 » 2 years ago, # |   +19 I think they are waiting for 30k
 » 2 years ago, # |   0 contest is too much delayed :(
 » 2 years ago, # |   0 reschedule this contest.
 » 2 years ago, # |   0 common I am not having dinner just because of the contest and it's getting delayed....
 » 2 years ago, # |   0 More delay but hopefully rated
 » 2 years ago, # |   0 it's Monday morning I was just trying to get a quick competition in.. now two delays?
 » 2 years ago, # |   0 Contest registrations are increasing by O(1) complexity xD
 » 2 years ago, # |   0 almost 30 thousand registrants ... that's huge!!
 » 2 years ago, # |   0 30K lmao....hope to become Expert Today
 » 2 years ago, # |   0 DelayForces !
 » 2 years ago, # |   +1 Close to 30k..!! May all registered participants give the contest.
 » 2 years ago, # | ← Rev. 3 →   +1 did it just got delayed again? just hope there will be a long queue in the contest. they might be updating pre-test cases due to 29k participants. in order to prevent long queue. (just my guess). good luck to all including (people who made this round.)
 » 2 years ago, # |   0 What is wrong? Contest has been reschedule twice already :|
 » 2 years ago, # |   +1 Can you reschedule the round again?
 » 2 years ago, # |   +1 Don't extend it again
 » 2 years ago, # |   +6 Are you kidding me?That contest is put off 10min again means I couldn't get at least 4h to sleep in CHN.
 » 2 years ago, # |   +3 Div-3 be like.. wait 10min more..;)
 » 2 years ago, # |   +28 CODEFORCES
 » 2 years ago, # |   0 Why the contest is delayed?
 » 2 years ago, # |   +17
 » 2 years ago, # |   +1 Atleast tell us the reason for the delay.
•  » » 2 years ago, # ^ |   0 I think it's due to the huge number of participants. what do you think?
 » 2 years ago, # |   0 WoW!I'm waiting.
•  » » 2 years ago, # ^ |   0 wow! everyone is waiting
 » 2 years ago, # | ← Rev. 2 →   0 Now we have record of participants, but I think for another delay we will have antirecord
 » 2 years ago, # |   +10 Now codechef might just get a new excuse XD
 » 2 years ago, # |   -9 Its 30 minutes late. Why ?I have to eat food..
•  » » 2 years ago, # ^ |   0 ну иди поешь)
 » 2 years ago, # |   +22 ..
 » 2 years ago, # |   +3 Cheers to everyone who has participated in the contest with maximum registered participants!
 » 2 years ago, # |   +5 while(participants<30k): delay+=10mins
 » 2 years ago, # |   0 Why is the contest getting delayed??????????? I entered at 8:05pm IST to find out that the contest is starting at 8:20pm IST. When I enter at 8:20pm IST, it is showing delay of further 10 minutes!!
•  » » 2 years ago, # ^ |   0 may be some question is wrong
•  » » 2 years ago, # ^ |   0 Maybe they're testing if the servers can handle the load
•  » » » 2 years ago, # ^ |   0 but that is not good idea, delaying also increases number of registrants..
 » 2 years ago, # |   +3 new year resolution effect 30k
 » 2 years ago, # |   +1 There should be an option for unregistration from contest if delays come.
 » 2 years ago, # | ← Rev. 2 →   +4 30k participants, This contest is going to be very much fun.
•  » » 2 years ago, # ^ |   0 until I see -150 delta.
 » 2 years ago, # |   0 please no more delay :(
 » 2 years ago, # |   -23 codeforces randi ,start krrde
•  » » 2 years ago, # ^ |   +8 You want me to find you on LinkedIn and send this comment to your recruiter? Delete it fast little bitch.
•  » » » 2 years ago, # ^ |   -9 We often get stressed during or even before the contests, which leads to frustration. Keeping that in mind and not to forget the constant delays today i would like to appologise to absolutely nobody, do what u can , the king does what he wants.
•  » » » » 2 years ago, # ^ |   +8 Your frustration results in you calling this platform a "whore"? And you're no king. Just a sad pussy behind a keyboard. Don't shit where you eat. If you can't respect the platform then leave. Everybody here is "frustrated" but nobody is using these stupid insults like you.
•  » » » » » 2 years ago, # ^ |   -9 I will not respect the platform and I'll not leave either. What can u do about it Mr. Authority?
 » 2 years ago, # |   +19 I hope this countdown is not a countdown to the next delay
 » 2 years ago, # |   +22 Come on!!!! My mom will beat me if i will not eat my dinner at time.
•  » » 2 years ago, # ^ |   0 I'm rooting for your mom.
•  » » » 2 years ago, # ^ |   0 My mom even don't listen to my father.
 » 2 years ago, # |   0 They're gonna keep delaying the contest until some people unregister because of frustration :D. Don't blame them though, this is a historical milestone.
 » 2 years ago, # | ← Rev. 3 →   +2 YES!! yEEEE! 30.000!gogogoGO! yEEEEEEEEEEES!!!!
 » 2 years ago, # |   +3 Me watching contest getting delayed , after waiting for 1 month for div3 - upload image
 » 2 years ago, # |   +7 was the delay to hit 30k registrants lol
 » 2 years ago, # |   +11 Now I am 16 years old.When Contest starts, I will be 116 years old :D.
 » 2 years ago, # |   +1 Highest number of participants in Codeforces history.
 » 2 years ago, # |   +1 If it takes so much time to reload use m1.codeforces.com , m2.codeforces.com or m3.codeforces.com.
 » 2 years ago, # | ← Rev. 2 →   0 Contest will be delayed for 10 mins. If it doesn't start in 10 minutes just read first sentence again.
•  » » 2 years ago, # ^ |   +1 while(1){ if(contestant>=30k) break; }
 » 2 years ago, # |   0 Congratulations for having 30K coders today.
 » 2 years ago, # |   0 Don't delay it anymore.OK?
 » 2 years ago, # |   0 Mike just wants achieve 30k :D
 » 2 years ago, # |   0 Number of comments increased by 200% due to this delay.
•  » » 2 years ago, # ^ |   0 as well as no of downvotes for this blog :(
 » 2 years ago, # |   0 the delay might be to get 30,000 no of participants
 » 2 years ago, # |   +28 Meanwhile:
 » 2 years ago, # |   0 30k on codeforces round!!! Congratulations!!
 » 2 years ago, # |   +4 RECORD! It's 30k.
 » 2 years ago, # | ← Rev. 2 →   0 Seems like, cp has become like engineering in India, you have to do it, whether you like it or not.look at 30K participants
•  » » 2 years ago, # ^ |   +2 Thanks to indian youtubers for making this possible -_-
 » 2 years ago, # |   0 Congratulations for 30k participants! This has been such a great platform.
 » 2 years ago, # |   0 There we go 30000+ registrations !!
 » 2 years ago, # |   0 25 mins late but... a new record :')
 » 2 years ago, # |   0 30000! Congratulations!!!!
 » 2 years ago, # |   0 Congrats CF for 30k participants..
 » 2 years ago, # |   0 Congratulations CF on achieving a new milestone of 30k participants.
 » 2 years ago, # | ← Rev. 4 →   +16 20:04: Me to Mom: Mom, I will have dinner at 10:05.20:05: Me to Mom: Let have dinner now; I will eat fast.20:20: Me to Myself: Well wtf I ate so fast? Let write a comment and let the entire community know :)20:30: Me to Myself: All the best :)UPD: 21:00: Me: Please Codeforces, make it unrated, unable to bear queue timings :)21:15: Regardless of rated/unrated, I stop giving the contest. #queueforces21:20: I enjoyed the problems, will upsolve them later when the queue is not long, also Congrats on the 30k+ registration.
 » 2 years ago, # |   +1 oh no! Queue of 5 min.
•  » » 2 years ago, # ^ |   0 How do you know the length of the queue?
•  » » » 2 years ago, # ^ | ← Rev. 2 →   +7 I've been waiting for 10 mintues and it's still not judged. So that's how I know.
 » 2 years ago, # | ← Rev. 6 →   0 TOOO LONG QUEUE uNRATED PLZ
•  » » 2 years ago, # ^ |   0 #queueforces
 » 2 years ago, # |   0 o shit queue that too for this long
 » 2 years ago, # |   +1 in queue "unrated"
 » 2 years ago, # |   +2 please make this round unrated....very long queue timing..!!
•  » » 2 years ago, # ^ |   +1 Yes, please make it unrated. The queue is of more than 20 minutes.
 » 2 years ago, # |   -9 Am I a noob king or C is actually tough.... Lol
•  » » 2 years ago, # ^ |   +4 Shut Up! You are not allowed to discuss about problems during contest.
 » 2 years ago, # |   +1 make this contest unrated!
 » 2 years ago, # | ← Rev. 3 →   +10 [Edited] Reference: https://codeforces.com/contest/1475/status/page/70?order=BY_RELATIVE_TIME_DESCFrom this page onwards for quite a few pages of submissions. (the page number will change as time goes, so a little ahead or behind, around 30 pages from the last page)Shady activities. [Edited/]Someone is purposely overloading the server. There are many accounts that have been created around 11 days back which have submitted codes that have lead to compilation error.Why tho? :/
•  » » 2 years ago, # ^ |   0 They may be college freshers
•  » » » 2 years ago, # ^ |   0 Probably not, the names are spammy, all created on the same day, submitted and went offline around the same time, submitted compilation errors around the same time. Very hard for it to be freshers, the names and profiles don't look genuine.
 » 2 years ago, # |   +3 Make it an unrated contest please.. queues are unbearable
 » 2 years ago, # |   +1 At this point they should just make this unrated, the queue is unbearable
 » 2 years ago, # |   0 Codeforces is really a awesome platform
 » 2 years ago, # |   0 In div-3 no of solution submit frequency is so much. So, If in div-3, only <1600 rating people can attend thats much better for the server i think. >=1600 rating can practice it virtually though (:
•  » » 2 years ago, # ^ | ← Rev. 2 →   0 Most of the participants in CF are below expert or unrated so that wouldn't matter
•  » » » 2 years ago, # ^ |   0 and i did not said by that all problem solved but can reduce (: just my opinion sir.but that's 5k people submit 5k*7 solution in first hour mostly. cause they solved all before 1 hours. and initial time is most important.
•  » » 2 years ago, # ^ |   +2 The fact that the contest isn't rated for someone doesn't means that it cant be enjoyable on a competitive point of view
 » 2 years ago, # |   0 Contest has been declared unrated!!!!
•  » » 2 years ago, # ^ |   0 I think everyone got the notification...
 » 2 years ago, # |   0 Why codeforces why?
 » 2 years ago, # |   0 Well not just a registrants record also a queue record
 » 2 years ago, # | ← Rev. 3 →   0 2021 == Extended Version of 2020 .
•  » » 2 years ago, # ^ |   0 2021 == 2020 won and now it wants have some fun :)
 » 2 years ago, # |   0 30 000 participants dissapointed for the first time
 » 2 years ago, # |   0 So we were trying not to annoy delays for this?!!
 » 2 years ago, # |   0 Qᴜᴇᴜᴇғᴏʀᴄᴇs..........................................
 » 2 years ago, # |   0 to cc and cf : you either die a hero or live to become the villain
 » 2 years ago, # |   +2 When CF Predictor shows +200 and the round becomes unrated...Sed lyf
 » 2 years ago, # | ← Rev. 3 →   +16 Please consider restricting new acccounts from participating div.3 (more than $5500$ out of $30000$, two times as the number of $1600+$ people. It's really weird.) or upgrade the judge system. The number of participant is too high for the current system (or the system is a bit off today?)
 » 2 years ago, # |   0 Maybe I should call it Qulayforces,right?
•  » » 2 years ago, # ^ |   0 No.
 » 2 years ago, # | ← Rev. 2 →   0 I guess, CF should only allow participants whose rating less than 1600 even to enter the problem-set page for Div 3.
•  » » 2 years ago, # ^ |   0 This will increase the no. of people having rating greater than 1600 to participate with a new round , which will have a big adverse effect.
•  » » » 2 years ago, # ^ | ← Rev. 2 →   0 I do understand your concern, but I guess Div3 are meant to be beginner friendly (Please correct me if I am wrong), and in such a case, why could it be only allowed to participants below 1600. (Also, If I had offended anyone, apology). I wouldn't say that high rated people shouldn't take part in lower Division contests. But given the possible scenarios of long queues and site getting down, It could be a suggestive measure.
•  » » » » 2 years ago, # ^ |   0 Suggestion is good but I think it is not practical
 » 2 years ago, # |   0 Is Codeforces taking inspiration from codechef nowadays?
•  » » 2 years ago, # ^ |   +7 Never in it's lifetime will Codechef have such a huge number of participants.
 » 2 years ago, # |   +9
 » 2 years ago, # |   +1 Queue 260 pages long :(
 » 2 years ago, # |   0 I'd love to sacrifice my Internet/CPU/Screen space to see ads on this website just to have better servers. Please admin consider this way of getting better servers.
 » 2 years ago, # |   +2 I had such a bad spree and now cf predictor showed +115 and round is unrated... brb gonna drink some bleach with vodka
 » 2 years ago, # |   +4 Very disappointing! Considering that there were 2 delays and the round was delayed by 25 minutes, it seems that they understood what was happening. Perhaps it was worth postponing the round a few days in advance, having solved the technical problems before. This is doubly sad because the tasks were interesting :(
 » 2 years ago, # | ← Rev. 2 →   0 They tried to prevent such unexpected issues by delaying the round a bit but still it could not be prevented :( Anyways beautiful problem set! :D The sad part is that today my exams got over, and I was like finally I can give the contest without much thinking about studying for exams.
•  » » 2 years ago, # ^ |   0 Is that a coronavirus on your profile?
•  » » » 2 years ago, # ^ |   +2 lol no! Its a polygon with thousand sides! That is a chiliagon!
 » 2 years ago, # |   +1 Getting a +150 increase and seeing contest becoming unrated hurts :(
 » 2 years ago, # |   +13
 » 2 years ago, # |   0 What is the procedure in this case? Can people discuss problems already as ratings are not impacted?
•  » » 2 years ago, # ^ |   0 i think you can discuss with friends but not in the comment section
 » 2 years ago, # |   +217 Sorry guys. I could not prevent the round from failing, as I was at the doctor's appointment.
•  » » 2 years ago, # ^ |   +42 Still infinite times better than Yesterdays Codechef cook-off.
•  » » » 2 years ago, # ^ |   -16 But that was rated.
•  » » » » 2 years ago, # ^ |   +16 beside unbalanced div2 & div1,they said they have improved servers before contest , then servers didn't worked during the contest for 30 minutes , created unfair ranking gaps and then they were stubborn enough to make it rated .
•  » » » » » 2 years ago, # ^ |   +10 Codechef is a joke nowadays. Only 2 short contests per month and that too getting server errors a lot, you can't even open IDE to submit the code forget about long judging time, similar thing happened in december as well. No wonder why CF is 10 times better than CC.
•  » » 2 years ago, # ^ |   +3 No problem MikeMirzayanov. Altough Iam sad about this round but ..... Get well Soon.
•  » » 2 years ago, # ^ |   +7 Got it. A ship was wrecked when the captain went to the doctor's.
 » 2 years ago, # | ← Rev. 2 →   +4 First time I solved 3 problems in a contest. But unfortunately It is now UNRATED...sad
 » 2 years ago, # |   0 I was getting around 100+ rating in this contest but luck cannot favour you always :(
•  » » 2 years ago, # ^ |   +6 Remember! there's also people who left the contest earlier.
 » 2 years ago, # |   +23 Problem G is not available on m2.codeforces.com, which is more strange than queue problem.
 » 2 years ago, # |   -37 Remove div3 from codeforces. It was pointless idea from the beginning and as for now servers are not able to handle 30k submissions for easy problems and I don't think they will able in the near future. You're only disappointing people.
•  » » 2 years ago, # ^ |   0 I think this is not solution
•  » » » 2 years ago, # ^ |   0 It is solution. Have you ever seen a queue on div1 round? Div2 rounds were unrated due to queue, as I know, but queue was caused by server issues (and extremely easy problem A and B). Today servers were on full power but anyway they weren't able to judge easy problems without queue. Removing div3 and making div2 harder will definitely solve queue issues.
•  » » » » 2 years ago, # ^ |   0 Of course we can solve problem with this for temporarily but when codeforces get bigger few years later this solution is useless
•  » » 2 years ago, # ^ |   0 I could bet if you were pupil, you wouldn't make this comment
•  » » » 2 years ago, # ^ |   -9 What's the point of div3 round for you (and pupils)? Practice? No, you will never reach even expert if your practice consists only of div3 ABC problems. Compete? No, your CP level is too low for real competition. Competing with this level and being happy with 2000th place on contest instead of 3000th, instead of practicing, won't raise your rating and you'll be pupil for life.
 » 2 years ago, # |   0 Please make it rated, I'm getting 140+ delta :) :(
•  » » 2 years ago, # ^ |   +15 Cool, you got 140+ delta after most people left ;)
•  » » » 2 years ago, # ^ |   +3 Ohh that's the reason for this miracle. I thought I done some extraordinary work today :)
 » 2 years ago, # | ← Rev. 2 →   +16 -- Problem A, Odd DivisorThis problem asks us to check all divisors of n if there is an odd one among them. Note that the constrainst are set in a way the the simplest implementation of the factorization will go TLE. see https://cp-algorithms.com/algebra/factorization.htmlEdit: Or just check if there is an divisor other than 2.-- Problem B, New Years NumberNote that n is fairly small. So we can check all multiples of 2020, and if the difference to n is divisable by 2021. If none of them is, then ans is NO, else YES.-- Problem C, Ball in BerlandWe need to choose two pairs. So, we need to know foreach pair p1 the number of other pairs we can choose, if we have choosen p1. That number is the number of all pairs, minus the number of pairs having the one or the other member of p1 as a member.Since each pair is distinct, we can count the frequency of all members in all pairs, and subtract that frequency from the number of all pairs.-- Problem D, Cleaning the phoneIts a strange greedy. We can sort the applications by storage units per cost unit. So simply double the storage units of the 1-cost apps, then sort them. Then we choose the best ones until enough storage is cleaned. If not possible then ans=-1.But, it can be that we can substitute one 2-cost app by a 1-cost app. For that, check if there is a not choosen 1-cost app that we can exchange agains the worst choosen 2-cost app, so that still enough storage is cleaned.Not sure how to prove that there cannot be more than one such substitution.-- Problem E, Advertising AgencyOf course we must choose the best bloggers first. But there can be equal bloggers, and if there are equal ones, we can choose among them.Consider the number of followers of the worst of the choosen bloggers. Let cA be the number of bloggers with the same number of followers as that worst one. And cC be the number of bloggers with same followers as worst, and wich are choosen. Answer equals nCr(cA, cC). This is, because we can choose any cC of those bloggers among the cA ones.-- Problem F, Unusual MatrixObserve that it does not make sense to flip a row or col twice. Flip it once or not at all.Then consider the first row. We can flip it or not-flip it. In both cases, we can see foreach column if it was flipped or not by comparing the fields of the first row of a[] and b[]. As a result we get the state of each col, flipped or not-flipped.Then check all other rows if we can construct the b[] version of the row by using the column flips on the a[] version. If this is possible for all rows then answer is YES, else NO.-- Problem G, Strange BeautyWe find the biggest possible set of numbers we can put into an array, then the difference to the number of all elements is ans.Consider that we have put one number into the array. The next one must be a multiple of the first one. And then the next must be a multiple of the LCM of the first two ones... It turns out that because the last added number is allways a multiple of all numbers previously added, we can allways add each multiple of the previous number. So we can create a graph where each number has an edge to each multiple of it, then find the longest path in that graph.Other possibility is a dp, where dp[i] is number of elements that can be added after having added element i.
•  » » 2 years ago, # ^ |   +7 Problems were really cool, thanks!
•  » » » 2 years ago, # ^ | ← Rev. 2 →   +8 Small note: A could be solved by checking if N is a power of 2 and outputing false if it is, else trueB can also be solved by removing as many 2020s as possible, ur left with only 1s to add to the 2020s removed, if there are more 1s than 2020s removed, then its false, else true
•  » » » » 2 years ago, # ^ |   0 Wow, cool, I did not see this.
•  » » 2 years ago, # ^ |   +1 Another approach for D:Fix the number of 1 cost applications and binary search to find how many 2 cost you need to take
•  » » 2 years ago, # ^ |   0 Every time I will forget that we can construct an algorithm with time complexity O(n + n/2 + n/3 + .......n/n).
•  » » 2 years ago, # ^ | ← Rev. 2 →   0 I have tried D with the same approach but it is not working can you tell me my mistake here is the link to my submission https://codeforces.com/contest/1475/submission/105410745 This approach is similar to spookywooky
•  » » » 2 years ago, # ^ |   0 Not sure about that. Mine looks like this 105418791
 » 2 years ago, # |   0 Video Tutorial A and B:https://www.youtube.com/watch?v=vMpkqoZZN0I
•  » » 2 years ago, # ^ |   +3 I don't see a single submission from your handle, why should one trust your solutions?
 » 2 years ago, # |   +75 I was wondering how that person was able to solve an problem C and problem E and problem G in one minute???problem A in minute 4problem B in minute 5problems C & E & G in minute 6???
•  » » 2 years ago, # ^ |   0 His submissions are skipped
 » 2 years ago, # |   +7 No matter the round is unrated, the problemset was really good. Thanks for making div3 rounds "for div3 participants."
•  » » 2 years ago, # ^ |   0 Don't say something generally! yes, it mattered for me and for many users
 » 2 years ago, # |   +19 Am I the only one who reduced F to a 2-SAT problem?
•  » » 2 years ago, # ^ |   +5 Can you please explain your 2-sat solution. Thanks in Advance!
•  » » » 2 years ago, # ^ | ← Rev. 6 →   +3