JainWinn's blog

By JainWinn, 7 weeks ago, In English

Hello, Codeforces!

I and 0x4F5F6F have curated a Solo Practice Contest in the gym, [contest:105005]. The level of questions is medium. This is for anyone who loves giving contests and solving problems. This contest will be of most interest upto Expert rated coders, but I would also like to invite Div. 1 coders to participate as well. For anyone who wants to practice or just wants to go through the problems can register for our contest here. Hope you will enjoy solving the problems!

I would like to thank:

Contest Details:

  • Date/Time: [contest_time:105005]
  • Problems: 6-7
  • Duration: 2 hours 15 minutes
  • Contest Invite: Invitation Link

We hope that this contest, regardless of your background, rating and result, will increase your exposure to competitive programming and make you better than you were yesterday. Have fun!

Note: You can also register for the contest while it is going on. You may want to check out our group for past contests.

Spoiler

UPD1: The registration has started!

UPD2: We have made the contest private, you can access the contest with this link.

UPD3: We are really sorry to say that G was comparable to one of AtCoder's problem. In the future contests, we'll make sure this doesn't happen again. But we can agree on the fact that rest of the problems were actually interesting and quite fun to solve!

UPD4: Congratulations to the winning contestants!

  1. Tobo
  2. Egor
  3. Kyte
  4. cpchenpi
  5. Aphrodite3107

Congratulations to first solves as well!

UPD5: The editorial is now available here!

Let's follow the trend of photo of the authors :)

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

As a problem setter, I feel you would enjoy solving the problems !!

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

    As a problem setter, I feel you would enjoy solving the problems !!

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

      As a participant this time, I feel I would enjoy solving the problems!!

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

I JUST HOPE I DONT STUCK IN STARTING PROBLMES ......

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

Excited for Coding Challenge Alpha V. Thanks to the organizers and problem setters for creating this opportunity to enhance our skills.

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

Wow. Excited!

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

As a problem tester, I really liked the problems and highly recommend everyone to participate in the contest !

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

Nice problems, any ideas for F?

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

    expand x into r-l+1 and rearrage the terms to make something meaningful

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7 weeks ago, # |
  Vote: I like it +24 Vote: I do not like it

Problem G is exactly the same as this atcoder problem from abc342 which was held on 24th feb (Literally 10 days ago).This is just LAZY.

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

    and here is the problem E (very much similar) click me

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    7 weeks ago, # ^ |
      Vote: I like it +9 Vote: I do not like it

    they didn’t even change the samples :(

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    6 weeks ago, # ^ |
      Vote: I like it +11 Vote: I do not like it

    We are really sorry to say that G was copied from AtCoder. This was definitely not expected from our side, and our testers did their best, but unfortunately they were unknown that this problem exists. Had if I tested, I would've identified G as I participated in that contest.

    In the future contests, we'll make sure this doesn't happen again. But, I am pretty sure we can agree on the fact that rest of problems were actually interesting and quite fun to solve!

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

How to Solve D?? When Editorial will be Published ?

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

How to solve C ? ;-;

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

    Irish army can fire at the positions which are from l-k to l+n-1+k. so you have to kill the german soldiers in that range and all of them should have +ve strength and at max n germans soldiers should be killed.

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7 weeks ago, # |
Rev. 3   Vote: I like it +4 Vote: I do not like it

Editorial : Problem A :

Solution
CODE :

Problem B:

Solution
CODE :

Problem D:

off topic
Solution
CODE :

Problem G :

Pre-requisite
Solution :