Rudro25's blog

By Rudro25, 5 weeks ago, In English

Hello Codeforces!

I'm glad to welcome all of you to Noobs Round #2(Div. 4). The contest will start at wednesday, January 27, 2021 14:35 UTC. The round will not be rated for any participants since it is unofficial.

Contest link: https://codeforces.com/gyms

You will be given 6 problems and 2 hours to solve them. I recommend you to read all the problems :)
This problem-set were prepared for users with a rating range from 0 to 1400 but anyone is welcome to participate!!

All problems are prepared by me, with a lot of help from the testers and coordinators.

We would like to distribute our thanks equally to the following people who made this round possible.

We hope that statements are short and you will enjoy the problem set!

Good luck to everyone and Have Fun! $$$\;$$$ See you in the round! :)

UPD1: Registration available now!

UPD2: Editorial Published!

UPD3: The round is over smoothly :) I hope you've all enjoyed the round. Congratulations to the winners and to everyone for participating!

Div-4 winners:

  1. Terabatev

  2. DeathChanter

  3. googol_S0

  4. jayeshgupta_13

  5. Vikas_Gautam

Winners from all Participants:

  1. Maksim1744

  2. LayCurse

  3. Gheal

  4. Sakhiya07

  5. Geothermal

And finally people who were the first to solve each problem:

A. First: Geothermal

Div-4 First : Luminal

B. First: Terabatev

Div-4 First : Terabatev

C. First: Maksim1744

Div-4 First : Luminal

D. First: Maksim1744

Div-4 First : Terabatev

E. First: Maksim1744

Div-4 First : googol_S0

F. First: i_love_cuiaoxiang

Div-4 First : HELLO_MF

 
 
 
 
  • Vote: I like it
  • +235
  • Vote: I do not like it

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5 weeks ago, # |
  Vote: I like it +163 Vote: I do not like it

As a coordinator, I assure you this is not a convoluted scheme to get the top contributor spot back by doing almost nothing.

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    5 weeks ago, # ^ |
      Vote: I like it +152 Vote: I do not like it

    As the gym poster, I assure you this is definitely a convoluted scheme to post more contests in the gym that I'm not actually the author of.

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

      SecondThread If that's not too big an ask, we'd all love a "Good Morning, Everyone!" gym contest someday.

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    5 weeks ago, # ^ |
      Vote: I like it +8 Vote: I do not like it

    If the contribution points were displayed to 2 decimal places it would be nice. The table looks the same otherwise almost all the time.

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5 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

;)

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5 weeks ago, # |
  Vote: I like it +19 Vote: I do not like it

As a tester, I found the problemset to be well balanced and I'm confident that there are some problems that even higher rated participants will enjoy! I recommend everyone to participate.

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

    First of all thanks to everyone involved for making it happen. I really enjoyed the last 2 unofficial Div 4 rounds, so looking forward to this.

    But if problems are interesting and vouched for by experienced folks around here, why not make it official?

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

      Can't say for sure as I'm not the co-ordinator, but I guess Codeforces isn't going with the idea of conducting Div. 4 rounds for now.

      But I think it's a great for beginners, so I hope more of these unofficial rounds will follow.

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        5 weeks ago, # ^ |
        Rev. 2   Vote: I like it -30 Vote: I do not like it

        Ohh yes! I will try my best to attend.

        Hope it's not too rude to rag coordinators Ashishgup and 1-gon to know their opinion?

        UPD: Everyone downvoting this will lose their rating in next contest that is rated for them.

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          5 weeks ago, # ^ |
            Vote: I like it -9 Vote: I do not like it

          I am done being polite. No one here deserves that. Everyone is a jerk and just wants to downvote all the time.

          So come at me losers! Let the downvote party begin!

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5 weeks ago, # |
  Vote: I like it -6 Vote: I do not like it

I will for sure participate

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5 weeks ago, # |
  Vote: I like it +16 Vote: I do not like it

As a tester, I found the problem set quite standard for regular contestants. Everyone should participate and enjoy the contest.

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5 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

As a participant. I would like to thanks to all who put their effort ad time for this. :)

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

Is it rated?

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

    No sir! It's unrated. Please, check the Second line, it's already bolded.

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

is it rated ?

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5 weeks ago, # |
  Vote: I like it +12 Vote: I do not like it

As a tester i can't participate on such a nice round.

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5 weeks ago, # |
  Vote: I like it -7 Vote: I do not like it

As a tester, give me contribution.

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5 weeks ago, # |
  Vote: I like it +2 Vote: I do not like it

guys do participate to make it more interesting

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

as someone who isn't a tester, i will participate in the contest

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

Why it is not a official rated round??

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

    Because It's not an official Rated round.

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      But they should make it, second thread and ashishgup coders have contributed in this contest

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        5 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        all the problems are standard and for learning purpose.

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

Reminder: Just 30 minutes left to start!

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

    Is the handle from which this blog is written also your's?

    Just curious as username is quite similar

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      5 weeks ago, # ^ |
        Vote: I like it +8 Vote: I do not like it

      Yes sir, created for tackle some difficult moment. But attend contest by only one sir.

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

        hmm, you did the latest contest from this account lol.

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5 weeks ago, # |
Rev. 2   Vote: I like it +8 Vote: I do not like it

Thanks for the round! I liked the problems, and F was definitely a bit tricky!

I've uploaded a screencast to my YouTube, which I'll premiere 10 minutes after the end of the contest: https://youtu.be/TXgrIwhC750

(This is my first time trying out the "Premiere" feature, which I believe lets everyone watch & chat live.)

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    For me, E was more tricky. Solved everything else but E.

    But from your streams I can see that you are good at maths, so that might not be the case for you.

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

Penalty on testcase 1 :(

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    5 weeks ago, # ^ |
      Vote: I like it +4 Vote: I do not like it

    Sorry sir! May be it's the rule of 'GYM' contest. :(

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5 weeks ago, # |
  Vote: I like it +6 Vote: I do not like it

As a participant, We need more such rounds from you. Enjoyed solving E :)

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Thank you sir. Hope we come back again with more interesting problem :D

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5 weeks ago, # |
  Vote: I like it +2 Vote: I do not like it

Problems are really good and educational. It's great to see many Bangladeshis in the contest arrangement.

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

Out of all the problems E was the only one I had solved earlier and then also I struggled a lot with it.

A was garbage.

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5 weeks ago, # |
  Vote: I like it +16 Vote: I do not like it

You have made a significant improvement in writing problem statement.Your last round had some unclear problems. This one was quite nice.

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

Very nice contest, Thank you

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

Solutions to all problems: https://youtu.be/bh9KjbjQCrY

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

thanks for the nice problemset. will only div 4 standing be available ??

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    No sir. I just find the standing by myself :(

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

This contest was like div 3, not like div 4.. Noobers have been amazed

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

Nice problems.Hopeful and excited to see a rated contest from Bangladeshis.

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Thank you sir :D May be one day possible a official round from BD.

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

any one please describe solving process of D please

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

    Let x is a number. To get a smaller number than this we can take binary representation of x and replace some(possibly one) 1 with 0. Now, you are given two number a and b and you have to find two number less than a or less than b.

    Take binary representation of both a and b. Now if you find some position where bit of a and b both are 1 then replace any 1 with 0 and you will get the number.

    This process will work because when you are performing bitwise xor 1 xor 1 will give you 0 and 1 xor 0 will give you 1. So replacing 1 with 0 will give you larger xor output.

    Since you are replacing 1 with 0 so you will get a smaller number which follows the conditions.

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      I'm so sorry, I accidentally down voted instead of upvote. Thank you so much for that explanation!

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

All solutions for this contest https://youtu.be/TiZIHyI0Qdg. I loved the problem D most. Nice contest man. I hope this type of contest takes place more often.

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

it was really helpfull to me and also exciting to solve those question as a beginner!!.if you can organize more contest like this by giving us some of time from your busy schedule we will be more than happy!!!

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

hey why cant i open other solution which i havent solved from the leaderboard!?

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    5 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    Thank you sir! I will try and will request secondthread sir to open other submission, if possible.

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

can you put round #1 link ?

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

    round #1. Not well-prepared sir, but can try. B was garbage tho.

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      5 weeks ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      I think the link is wrong, showing no such contests

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        5 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        can you please check again. may be ok now.

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

          Yes, it's good now, thanks. also please change the settings of solutions, so that we can see other's submission, it will be helpful for all beginners like us. I know editorials are there, but other's solutions can also be helpful :)

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            5 weeks ago, # ^ |
              Vote: I like it 0 Vote: I do not like it

            i told secondthread sir. Hope he will open, if possible (: