SlavicG's blog

Unofficial Div 4 Round #1 Announcement
By SlavicG, history, 4 years ago, In English

Hello Codeforces!

mesanu 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://mirror.codeforces.com/contestInvitation/d477e058f265a72092af5c11074234d720a0fb5f

You will be given five tasks and two hours to solve them.The problems were created and prepared by mesanu 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 mesanu.

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

Editorial

Congratulations to the winners:

  1. extremum

  2. tribute_to_Ukraine_2022

  3. Denisov

  4. conqueror_of_tourist

  5. iamnifer

  6. brunomont

  • Vote: I like it
  • +154
  • Vote: I do not like it

Comments Comments (36)
| Write comment?
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

When will it take place??

→ Reply
»
4 years ago, # |
  Vote: I like it -14 Vote: I do not like it

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

→ Reply
»
4 years ago, # |
  Vote: I like it +5 Vote: I do not like it

very nice contest

→ Reply
»
4 years ago, # |
  Vote: I like it +21 Vote: I do not like it

Nice problem D

→ Reply
»
4 years 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
→ Reply
  • »
    »
    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Glad you had fun!

    → Reply
  • »
    »
    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    D had nothing to do with the elements' range.

    → Reply
    • »
      »
      »
      4 years ago, # ^ |
        Vote: I like it +13 Vote: I do not like it

      There actually is a solution which has to do with the elements’ range :) We will explain both solutions on the editorial.

      → Reply
»
4 years ago, # |
← Rev. 2   Vote: I like it -16 Vote: I do not like it

Great work SlavicG and mesanu,I enjoyed the problemset.

→ Reply
»
4 years 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.

→ Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

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.

→ Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Really enjoyed the problem set especially problem D. Luckily, I solved all problems xD.

→ Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Why can't I participate again?

→ Reply
  • »
    »
    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    You will be able to participate again or just practice on the 19-th, after the editorial is published.

    → Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

nice problem set for beginners. enjoyed solving D ;).

→ Reply
»
4 years ago, # |
  Vote: I like it +13 Vote: I do not like it

need more of these Unofficial rounds

→ Reply
  • »
    »
    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    We will try to do more of these rounds but it takes a lot of time to make these contests.

    → Reply
»
4 years ago, # |
  Vote: I like it +3 Vote: I do not like it

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

→ Reply
»
4 years ago, # |
  Vote: I like it +1 Vote: I do not like it

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

→ Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

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

→ Reply
  • »
    »
    4 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Glad you liked the contest! Check out the editorial to see our solution for D.

    → Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

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

→ Reply
»
4 years ago, # |
← Rev. 3   Vote: I like it 0 Vote: I do not like it

Yay! finished 13th! ^v^ Nice problemset

→ Reply
»
4 years 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.

→ Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Please Create more such Rounds.

→ Reply