Hello Codeforces!
SlavicG, mesanu, MikeMirzayanov, Errichto, and I welcome you to Codeforces Round #790 (Div. 4). It starts on 10.05.2022 17:45 (Московское время).
The format of the event will be the same as before:
- 5-8 tasks;
- ICPC rules with a penalty of 10 minutes for an incorrect submission;
- 12-hour phase of open hacks after the end of the round (hacks do not give additional points)
- after the end of the open hacking phase, all solutions will be tested on the updated set of tests, and the ratings recalculated
- by default, only "trusted" participants are shown in the results table (but the rating will be recalculated for all with initial ratings less than 1400 or you are an unrated participant/newcomer).
We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants.
Only trusted participants of the fourth division will be included in the official standings table. This is a forced measure for combating unsporting behavior. To qualify as a trusted participant of the fourth division, you must:
- take part in at least five rated rounds (and solve at least one problem in each of them),
- do not have a point of 1400 or higher in the rating.
Regardless of whether you are a trusted participant of the fourth division or not, if your rating is less than 1400 (or you are a newcomer/unrated), then the round will be rated for you.
Many thanks to the testers: timreizin, magnus.hegdahl, Adam_GS, KrowSavcik, down, pseudocoder10, jampm, Neophiliatic, Codula and of course _Vanilla_.
We suggest reading all of the problems and hope you will find them interesting!
Good luck!
UPD: the start of the round is delayed by 10 minutes.
UPD: Editorial is published!
as a tester, please give back my upvotes from previous round
As a tester,I can confirm.
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MikeMirzayanov, delete this comment, and block this saboteur idiot
you're literally green and you solved over 2000 problems................................ maybe get better at coding?
At least he is still trying and dedicating himself to improve his skills and this makes you respect him and his effort , unlike you talking and commenting bullshi*t from another account get life bro
You’re cyan… just get off of codeforces because clearly competition coding is not for you… I am orange on my main and I don’t believe cyans deserve to comment :)
Maybe competition coding is for you but clearly not codeforces community.
I'm sure your life must be very unpleasant, that's why you came to the internet to find your presence.
and i'm sure your lift must be very pleasant, because looking at your contest history, it's clear that you are an amazing programmer!
Codeforces, please add a way to hide a comment after you unhid it. Massive quality of life increase
reload the page, for now!
omg flamestorm round
As a tester, I really recommend y'all to do this round it's gonna be fire!
As an "of course tester", I am indeed a tester
Why are you chief-mentioned in every contest you test?
Helps with my superiority complex.
Good luck everyone!
another speed_force round,,, <3
[Deleted]
I respect all the effort from the masters and candidate masters testers, but it seems weird to have a round for participants with ratings less than 1400 tested by such high rated users, isn't it??
true tho, only 2 of them are below 1400
Wishing for the Worthiest get ++△.
yupp as u can see it is a pre_increment delta ^_^
First unrated round for me.... feeling like I'm a grand master :)
Same
:). Feels good to comment in Cyan.... Once again, no offence
me,too!haha
Ready to Participate （＾ω＾）.
good luck!
This will be my first unrated round
Good luck, everyone!
Hope my fingers work fast and I become Pupil this round
errichto finallyy :D
Hoping that, (A) one will get accepted by 00:00
not excited for yet another useless round!
nobody care , we are excited
Please no more Div4!!!
I hope to repeat it again
Shouldn't it be rated only for newbies? Greens are not completely newcomers to allow them to get boost by easy implementation problems, they have already solved a lot of them in order to reach pupil.
As a tester I want you guys to know that every odd number is a part of Pythagorean triplet of the form x (x²-1)/2 (x²+1)/2 (where x is odd) also (x²-1)/2 and (x²+1)/2 are consecutive numbers.
thanks
This is a very cool way to generate pythagorean triplets btw.
Time to go blue
Omg pseudocoder10 tester! Orz.
what does orz mean??
a char picture，mean respect admire，just like ヽ(*´з｀*)ﾉ (*'▽'*)♪ these
Thanks :)
btw are there more of these orz(can you send me).
Sure.But in order not to flood the screen,I can only post part of it.Hope you like them! happy： ✧٩(ˊωˋ*)و✧ (≧▽≦) surprise： Σ(っ °Д °;)っ （｀Δ´）！ angry： ╰（‵□′）╯ shy： (//∇//) debug： (ノ=Д=)ノ┻━┻ ac: (*'▽'*)♪ wa: ｡ﾟ(ﾟ´Д｀ﾟ)ﾟ｡ hack: ψ(｀∇´)ψ
thanks a lot.
Thank you sir for giving me enough rating for another chance to participate in div 4
hey Errichto...how's going on? You've a very good teaching youtube channel...right?
Div. 3 and Div. 4 are my favorite.
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bruh
Why do you hate us so much?
i hope that i will get more rating
GooD LucK FoR EveryonE !
My time has come!
first unrated contest.
Nice job
its also my first unrated round ... ;)
We need div 4 round regularly like this.
ready for solve all contest problems ????
can someone tell me how to become tester on codeforces
lol
Good luck guys!
How can I be a TESTER?! :)
guys, please follow it!!
We urge participants whose rating is 1400+ not to register new accounts for the purpose of narcissism but to take part unofficially. Please do not spoil the contest for the official participants.
Will the round be rated for me? I was rated 1399 and registered as a rated participant. After the last div 2 round I reached specialist again. in the registrants page, that out of competition star ( * ) is not there on my name. Am I a rated participant?
No , this contest will still be unrated for you
thanks got it
I hope the hardest problem is not green rated otherwise full speedforces
as not a tester，give me contribution
first unrated round for me on codeforces. Its feels good to participate this type of contest. advance good luck for all of the newbes and pupils. hope it will be enjoyable round for everyone.
is there any cap on the max positive rating we can get from div4?
Be pupil and know it won't help :-)
Bisquito "Be pupil" ok I will not be pupil after this contest. I will be specialist.
Ready to Participate and hopes to perform better
If it wasn't for school, I would have definitely done this contest!
Do it from school
lol, I have pe first period. I could grab my computer and hide in the bathroom, but that would be a lot of work lol
Good luck everyone!
I am going to become Contribution -100
note 5 minutes delay
here wo go again :)
here we go again x2 :V
now 10 minutes delay :((
delayed?
Was prepared to be the fastest guy on a wild west in fastforces and 5 min start delay haha
Actually 10 min :)
Why did the race put off?
DelayForces
it was a lie, so I removed this comment...
Same lmao
why delay wwuwuuw hahahah
5 minutes delay for cooling down the excitement ;-;
super excited for my first unrated contest, also haven't been giving contest in CF for some time
postponed again!
now its 10 minutes delay :3
why this happends?
delay for the 3rd time and i am not giving the contest
keep us informed
why so delay ? joke or not?
Slavic round yay
delayed again QAQ
Another 5 minutes?
i do not know what's happening ??
adds another song to the playlist
Looks like they want to reach the 30K mark :)
It's a good opportunity to increase rating
The contest put off again and again...... It's 22:40 in China now!!! I want to sleep earlier!
Same as you
korean 23:40 and i have class next morning 08:00 am
me, too. I have to go to school tomorrow (at 6:30)
you can finish it in 30 minutes and get to sleep:)
5555555
india 20:13
Really excited for the round
Is it rated?
for unrated , newbie and pupil only
Why is it getting delayed constantly? Anyone else facing this problem?
Delayed by 5 minutes again!!!
jab aukat nhi h karane ki toh kyo karate ho contest.
why late？
5 minutes delay again.
Anything wrong !! 5 mins delyaed in further term .. :(
Another delay ..
Holy, so many delays.
Use your brain: don't downvote the round just because of some as yet unknown issue that is almost certainly not the fault of any authors or coordinators.
Bal maat bako madarchod
What's going on?
Maybe they are waiting for 28K participants.
div 4 uwu
Again 5 min late Haha
Why delay?
only reason im still motivated is because of the substring kitten there
Note the unusual start time :)
sbiforces (only indians can understand)
i did not understand
abhi lunchtime hai baadme ana
However, I'm not the only person who face the problem.
Is it because of too much traffic?
Well, 10 minutes delay better than 504 error during the contest
Again postponed.Try not to be excited
I thought I could participate on school. 10 minutes delay destroy my hope and dream :(
Usually these delay kind of things are found on codechef, not here
虎酱YYDS！！！！！！
specialists after 1hr in div4: now we can rest
The submissions time of rank1, puckerbuttiampowerful, reminds me an algorithm called "three points". :(
I wonder if tourist can do faster than the 1st place.
This was very interesting and good round! Thanks for this tasks.
Yeah, but it is very sad that problem G was a tree problem, so I had to use bfs to solve it(
Since $$$P_i < i$$$, the traversal in reverse order from $$$n$$$ to $$$1$$$ is a topological order. Therefore you don't need BFS/DFS.
Edit: Oh sorry, I noticed your unique handle just now, now I get it.
Why is it sad if you have to use BFS/DFS in a problem?
Better than last div4, excellent for newbies to learn.
One of my Friends warned me to never give a DIV-4 contest if u are new to coding!!
Div -4 is the worst Nightmare for actual newbie coders !! They sure get their worst ranks in div 4 !! Due to some overly smart people giving contest from new ID's. Today I can say its true!!
I don't know what fun they get by just seeing good ranks in their alternate accounts.
BYE BYE CodeForces, you got a TOXIC community out here!
get good and let's beat some overly smart people !!
you could just avoid div 4 and participate in div 2 and 3. Why leaving codeforces all together?
I already guessed how toxic this community is, full of nerds , you surely showed the toxicity by down voting a genuine concern!!
And then what?
What is wrong with my fenwick tree. Please tell.
I think using a ordered_set is a better option
still i want to know my mistake.
Deleted
Your mistake was using out-of-bounds indices. There's nothing wrong with vectors.
Sir, please tell me.
why my fenwick tree is failing on test case 3.
Edit:- got it. So it was just because my #define int ll was commented. Feeling sad.
Submission with Vector
Same Submission with Array :
Still couldn't find the mistake
arr.resize(n,vector<int>(m));This doesn't completely reset a vector in case of multiple test cases.
resize()doesn't touch existing elements.Thanks a lot, Didn't knew that.
Same as you
The test2 of F was bothered me for a looooooooong time.......
same bruh, spend 1 hour+
what was ittttt
I mistakenly thought F meant: For every x(l<=x,x<=r), ax has to occur more than k times between l and r Find the longest segment and output l,r This is much more difficult than the correct question
i dont know why I've just thought of prefix suffix in D it just wasted my 40 min sad life:D most of thee time it happens with me in 2d matrix I'm not able to make an estimate that in how mush time complexity my code will work some one pls clear my doubt i just dont to repeat same mistake in next round
Same, wish I was more greedy TvT
I usually check the limits, use this blog https://codeforces.com/blog/entry/21344
is H2 can be solved using a couple of vectors or a multiset? All I see is some trees here and there
Used Mergesort
It can be solved using gnu pbds in C++ .
provide required code pls
here it is, its not mine though
$$$O(N \log N)$$$ inversion counting in Div4? lol
idea matters, there are so many implementations on web
the problem is searchable
Here is my fenwick tree which i wrote during the contest.
why is it giving wrong answer.
...
try long long instead of int
the answer may be up to $$$2\times 10^{10}$$$ so use
long longinstead ofint.got a penalty for this too :(
I made a Screencast + Solutions video in case someone is interested.
How to solve H2 ? I had noticed that the answer is n*(n-1)/2 — number of inversions in the reversed array a. Is there an easier way ?
Inversion count can be found in $$$O(n \log n)$$$.
I know this, but I'm a little suprised that so many people solved H2. Are there really a lot of people 0-1400 rated that knows such algorithm ?
There are really a lot of people who know how to use Google :)
or
TelegramI am definitely not good at CP, but I solved 1200+ problems in online judge. There will be many people who have knowledge like me.
I used a comparatively different approach , for each index $$$i$$$ find the number of times value >=a[j] appear such that j<i.
H2 is very similar to this problem. Many people solved it before.
Take a merge sort + count inversions template from the web, change <= to <, and change int to long long, then H2 can become AC.
Just use a Fenwick tree
I burned some time on bad approaches involving top/bottom pairs that ignored that the tops were unique and already sorted.
Eventually I crawled back to doing a 2D dp brute forcer, the debug output of which pulled my attention back to those facts.
From there it was pretty straightforward to replace the inner loops with any range sum thingy so I copypasta'd a BIT.
Funny/headdesk thing is my source for that was part of my inversion counting scratch code/notes, despite not having explicitly made the overall observation.
There's also and interesting solution using trie (not sure if it's well known). Here's my submission with such approach if you're interested:
https://codeforces.com/contest/1676/submission/156746831
You can also use a Segment/Fenwick Tree to solve the problem
how to solve H2? I have tried using multiset but it is showing TLE. Can anyone please give me any
hint? Please put yourhintinside spoiler tag.H2 is known as "Inversion Counting". You can find solution by using merge sort or Fenwick Tree(BIT)
But what is the concept or idea behind it?
I think this post will help you.
You can also use multi ordered set..Here is my sol 156673899
bro is it really div 4? xD
Very Nice and educational Problem .. this is how really div 4 should be
kudos to the authors
In the last 20 seconds i was about to submit my solution for H1... but it didn't load .I have a stable network but i didn't load then i had to submit it just 10-30 sec after the contest ended and got Ac. Please make sure that your servers act more fast ..... I wanted to do good badly but because of the servers ..........Felt bad so i expressed it i know many people can relate to it !
Believe it or not, exactly the same thing happened to me! I submitted when there were like 10 seconds left.
i dont know why I've just thought of prefix suffix in D it just wasted my 40 min sad life:D most of thee time it happens with me in 2d matrix I'm not able to make an estimate that in how mush time complexity my code will work some one pls clear my doubt i just dont to repeat same mistake in next round
Too easy.Solve all in 34 minutes.Wish there will be more harder contests instead of easy dishes like this one...
How about you STOP SMURFING IN DIV4
What do u mean by SMURFING?
It was fun! I still have too much to learn and improve. More Div4 please. Thanks for the authors.
Oh yeah, this is the first time I can solve all the problems. Only mistake was to spend about 40 minutes on problem D because I let loop j go to n instead of m.
I love you, Mike
and errichto too
For problem H2 in this contest, I knew the answer is just the number of inversions in the array, from solving H1. Since this is quite a popular question, is it ok to use the merge-sort implementation from Geeks for Geeks? I also gave credit to the website in a comment.
it is ok.
Nice round. It can be a nice idea if a new account needs at least 3 rated division-2 contests and solve at least one problem in each of them to be rated in a div 4 contest. Then many alts could have been removed and the actual ones could have got their deserved places. Again nice work by the authors.
My video editorial: https://youtu.be/98QD80PNA0Y
Why does my score not appear as "official", even if I have a rating of 1365?
I first thought it was because I have had a rating of more than 1400 in the past, but I have seen others which are official, and had ratings above 1400.
https://codeforces.com/contest/1676/submission/156634937 https://codeforces.com/contest/1676/submission/156634937 https://codeforces.com/contest/1676/submission/156729306 https://codeforces.com/contest/1676/submission/156739233 https://codeforces.com/contest/1676/submission/156707954 https://codeforces.com/contest/1676/submission/156625449 https://codeforces.com/contest/1676/submission/156709633 https://codeforces.com/contest/1676/submission/156734329 https://codeforces.com/contest/1676/submission/156736226 https://codeforces.com/contest/1676/submission/156707958 https://codeforces.com/contest/1676/submission/156738205
Hope these participants will be punished as their submissions clearly violates Codeforces rules (premeditated if cases to make hacks).
Remove the last one(156641831). Maybe a result of using endl and also not using fast io imo. Hence, TLE.
Thanks, fixed.
what is the benefit of doing this kinda "IF hack" in the first place?
trash contest
trash comment
trash reply(including mine)
get off of codeforces because looking at your rank, clearly coding is not for you
Ahahahaha! You poor thing.
No Offense, but I can't help it LOL. Let’s put the Taiwan China thing aside. You wrote "I think that you should improve your English level first before speaking English".
But I see 12 edits and still lots of grammar errors in your reply.
My English is bad, but it seems like Your English level is even more shit in my opinion LOL. You had better go back to elementary school, my friend. Sorry!
LMAO poor guy.
Ahahahaha! You poor thing.
This is my first contest to solve in, i just want to know when do i get a rating? i solved 3 problems and i thought i'd get a rating after the contest ends since i am unrated. any clarification would be appreciated thanks
There is 12 hours for hacking in this contest so rating will be updated after 12 hours
Ratings are usually updated a few hours after the contest, but since this contest has an open hacking phase which lasts 12 hours, you'll have to wait at least 12 hours more for your new rating.
Good luck!
First,you have to wait 12 hours since this contest need to be hacked. Then,you have to wait some hours since each submission need to be retest by more data(especially the hack data). Finaly,you only have to wait some hours again since the contest need time to calculate our rate.
5-8 tasks ?
Yes, -3 tasks.
Apologies if this was addressed before.
How are the rankings calculated in Div. 4 rounds?
based on your performance
I mean, how is performance calculated? Because there seems to be no score for each problem.
Based on how many problems you solved. If two participants solved the same amount of problems they are compared by time penalty
So all problems hold equal scores? Thank you
best contest i have ever enterd thanks for the authors
Won't anyone talk about the person who finished the contest in less than 9 minutes alone? The 1st place, btw this is my first rated round.. I'm just dazed
He solved five problems within 3 mins, that's an average of 36 seconds per question. I don't think it's possible by one person
36 seconds isn't even sufficient to read the whole question, so unless he already knew the questions beforehand, I think it's a high chance the first rated is done by a team instead of an individual
Maybe he is one of the writers or testers of the contest and he just created a fake account and submitted the solutions.
Can someone please help me out, I don't know why when I untick the show unofficial in standings it doesn't show a + for my A&B ques, it shows for the rest of the ques?
I'm sorry this was my first contest, this div4 contest is coming under an unrated contest, so for this contest, Will I not get any rating?
In Problem F, I use the unordered_map to store the data, but my code has been hacked. Can anyone tells me, why unordered_map is slower than map in C++.
u can refer to this blog
Never use unordered_map in codeforces contests.Actually the time complexity is unstable,and in addition it will surely be hacked by some "interesting" coders.
I hacked your sol the reason is collision, in case of collision the time of search goes from O(1) to O(n) because the c++ handle collision in a linear data structure unlike that of Java which use AVL tree, so either use map ot custom hashing
Ok, Got it. Thanks a lot for all of above help!
My solution for Problem E was correct when I submitted it during the contest yesterday, but now after the system testing, it is showing as wrong. Does anyone know why is that so? :( (My solution even matches the one they explained in the editorial, idk why this happened)
It is again tested with the test case use in hacks, you have to find the test case for which it is failing, maybe it's small implementation issue
Time limit was too strict on F and editorial solution on python TLE's
Hii i am newcomer.. till now i have given 4 rated rounds and my rating is less than 1000… will i get rating for this round???
Hm, strange, why I am not still rated
Is this contest unrated?
They said it is rated
Go to your account page and see all the contest you have participated in you will see that it showing there that this contest in unrated
who said?
This contest is rated for you as stated in the announcement. Just be patient.
I wonder what differentiated the TLE solutions and the AC solutions for question F when using pypy 3-64, around 85% of the accepted solutions for F in pypy3-64 either got hacked or TLE on test 22 in system testing
I solved 8 questions and it showed up perfectly fine in the unofficial standings section but in the official section it is showing that i only solved 4 questions and my rank is considered accordingly i.e 8000 which should have been around 700 or something in reality. This codeforces glitch will cost me my rating. Please resolve this glitch.
I have uploaded the images for proof...
link to unofficial ranking: https://photos.app.goo.gl/AzGA6H6yN9oKPbae7
link to official ranking:https://photos.app.goo.gl/rJwGDBkcw6wX8yEV8
is it rated or not?
It is rated
Go to your account page and see all the contest you have participated in you will see that it showing there that this contest in unrated
It is rated for everyone below 1400.
Ya i have the same issue.
Are your submissions not showing up in the official section as well?
I added both of you as friend. went for friends standings and it's showing perfectly.
check for the official standings and you will see the difference
Not at all
It seem that the only way is to wait?.
yep
Ya now they have rectified the issue.
yess!
Everybody whose rating is less than 1400 will have a rating change after this round. You guys gotta be a bit patient, everything will be completed very soon. Currently all submission are being reviewed with new (added from hacking stage) test cases.
Please be quicker... I was in bad emotions because of that for near half a day!
You will surely become a specialist so I congratulate you!
thanks, but that problem really worries me a lot
Tested code in ideaone and kept it on public unknowingly (since my laptop was running slow during the contest). Codeforces sent mail saying two of other codes match my code. Will my rating be affected by this?