SlavicG's blog

By SlavicG, history, 5 weeks ago, In English

Hello Codeforces!

ssense and I are glad to invite you to Unofficial Div 4 Round #1. The round will not be rated for any participants since it is unofficial. Sadly, We can not post the contest on the Gym Section, so you can virtually participate in the contest by clicking this link:

https://codeforces.com/contestInvitation/d477e058f265a72092af5c11074234d720a0fb5f

You will be given five tasks and two hours to solve them.The problems were created and prepared by ssense and SlavicG for users with a rating range from 0 to 1400 but anyone is welcome to participate in the round!

We would like to thank everyone who was involved in the round preparation:

Even though the contest is unrated we believe it is a really good way of practice, especially for Div 4 users. We tried our best to keep the statements short and clear and we hope you will like our problems!

UPD: You can participate whenever you want, just click the link above and virtually participate.

UPD2: Tutorial will be posted September 19 by ssense.

UPD3: Editorial is out and contest is open for practice!

Editorial

Congratulations to the winners:

  1. extremum

  2. I_love_chickpea

  3. Denisov

  4. conqueror_of_tourist

  5. Nifer

  6. brunomont

 
 
 
 
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5 weeks ago, # |
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Good Job SlavicG!

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5 weeks ago, # |
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When will it take place??

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5 weeks ago, # |
  Vote: I like it -14 Vote: I do not like it

Auto comment: topic has been updated by ssense (previous revision, new revision, compare).

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5 weeks ago, # |
  Vote: I like it +5 Vote: I do not like it

very nice contest

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5 weeks ago, # |
  Vote: I like it +21 Vote: I do not like it

Nice problem D

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5 weeks ago, # |
  Vote: I like it -11 Vote: I do not like it

Thanks for this nice contest ..D was more tricky than E for me.. Felt good to solve all problem for the first time (though virtual)....

Spoiler
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    5 weeks ago, # ^ |
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    Glad you had fun!

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    5 weeks ago, # ^ |
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    D had nothing to do with the elements' range.

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      5 weeks ago, # ^ |
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      There actually is a solution which has to do with the elements’ range :) We will explain both solutions on the editorial.

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5 weeks ago, # |
Rev. 2   Vote: I like it -16 Vote: I do not like it

Great work SlavicG and ssense,I enjoyed the problemset.

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5 weeks ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it

D was fun to solve. I saw a tougher version of E somewhere else, maybe in a previous CF contest.

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5 weeks ago, # |
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C was easy to solve as it is quite similar to a problem which was on atcoder DP contest.

Anyways great contest:)

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    5 weeks ago, # ^ |
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    yeah, I just copy-pasted that code I submitted in atcoder DP contest. Nice contest overall

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5 weeks ago, # |
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Lol there is nothing worse in debugging when you have taken the input incorrectly , that is what happened with me in E ,literally wasted like an hour searching where i did the mistake.

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5 weeks ago, # |
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Really enjoyed the problem set especially problem D. Luckily, I solved all problems xD.

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Why can't I participate again?

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    5 weeks ago, # ^ |
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    You will be able to participate again or just practice on the 19-th, after the editorial is published.

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5 weeks ago, # |
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Thank you for the awesome problems

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5 weeks ago, # |
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nice problem set for beginners. enjoyed solving D ;).

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5 weeks ago, # |
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nice problem set ............problem D was amazing.

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5 weeks ago, # |
  Vote: I like it +13 Vote: I do not like it

need more of these Unofficial rounds

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    5 weeks ago, # ^ |
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    We will try to do more of these rounds but it takes a lot of time to make these contests.

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5 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

Nice round. You should propose Div. 4 round on Codeforces.

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5 weeks ago, # |
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Wow what a time to be alive. Rated rounds everyday, and DIV 4 is love. To be honest, codeforces should do DIV3 and DIV4 everyweek.

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5 weeks ago, # |
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The limitation for B is wrong. I think that n should be <= 2 * 10^5

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5 weeks ago, # |
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when are we going to have round 2? :D

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enjoyed solving. Thanks SlavicG ssense :) solved A,B,C,E

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    5 weeks ago, # ^ |
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    Glad you liked the contest! Check out the editorial to see our solution for D.

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5 weeks ago, # |
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problem D was very good,thanx for the nice problemset in general, love to see more of them in future

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5 weeks ago, # |
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Nice D, trivial E. i think E can not be so standard next time. Although it was a nice contest, great work! :D

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5 weeks ago, # |
Rev. 3   Vote: I like it 0 Vote: I do not like it

Yay! finished 13th! ^v^ Nice problemset

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5 weeks ago, # |
  Vote: I like it +1 Vote: I do not like it

E was easier than C, D. D was like a Atcoder style problem(So it was a cool one). Great contest overall. Need more like this.