Arpa's blog

June Circuit '19
By Arpa, history, 6 years ago, In English

Hello everyone!

Another long and exciting contest is here, June Circuits '19, a challenging challenge with 8 amazing problems, should be solved in 9 days. The contest will start on June 21, 15:30 PM UTC.

Thanks to problem setters for doing such a fantastic job, we have 7 setters involved this time (!):

I'm tester of the round, I'm completely sure that you'll enjoy too!

To make the challenge more interesting, we will add problems to the contest in this order:

  • Day 0: Very-Easy, Easy-medium, Approximation.
  • Day 2: Medium, Medium.
  • Day 4: Medium, Medium.
  • Day 6: Medium-Hard.

As usual, there will be some sweet prizes for the top five competitors:

  • First place: $100 Amazon gift card + HE t-shirt.
  • Second place: $75 Amazon gift card + HE t-shirt.
  • Third place: $50 Amazon gift card + HE t-shirt.
  • Fourth place: HE t-shirt.
  • Fifth place: HE t-shirt.

Hope to see you on the leaderboard!

  • Vote: I like it
  • +35
  • Vote: I do not like it

Comments Comments (23)
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6 years ago, # |
  Vote: I like it +4 Vote: I do not like it

Last month's circuits was a disaster. The problem statements were ambiguous and even editorials weren't provided, only author's solution was there. Hope so everything is perfect this time!

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    6 years ago, # ^ |
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    We're sorry for the problems in the previous contests. We're doing our best every month to become better. We change something and test, discuss together and think a lot. You can help us with your feedback (as you're doing now). Thanks!

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

      Hey Arpa, why aren't the editorials provided this time also?

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

        They are ready, I asked someone to upload them. Not answered yet. I'm sorry.

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

          Okay, we are waiting! And if possible, please also look into May Circuit's editorials too.

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

Why can't I log in to site? When I enter credentials and click I get error 500 and I get it for every page I visit there. Clear cookies -> everything is fine. Log in again -> error 500. Is my account broken? Is that a known issue? :D

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    5 years ago, # ^ |
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    Hi. I'll deliver your message to the back-end team. Thanks for your patience.

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5 years ago, # |
  Vote: I like it +11 Vote: I do not like it

for question P5 — Altitudes, for following test case, 100 100 0 -1 -1 0

the expected output is shown as 0 but we can clearly see that solution exist and answer can not be zero. Please look into tester/setters solution.

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5 years ago, # |
← Rev. 2   Vote: I like it +12 Vote: I do not like it

This is bit harsh, but You should have mentioned it in the announcement if this circuit was supposed to be educational.

  1. Rotation : No issues but fairly simple.

  2. Determine the Winner : Already appeared in codechef.

  3. GCD Problem : Seriously, You're not kidding us? This is so standard that I even included this in one blog post that I wrote.

  4. Function Value : Again classical.

  5. Queries Problem : Appeared in Contest on hackerearth/hackerrank (without updates).

  6. Altitutdes : This is okay.

  7. XOR Paths : Seriously? Just Paste the code for Xor Transformation.

I mean having almost all problems, which involves 0 thinking, and just pasting part of code from somwhere else is not how a round is supposed to be. :-)

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

    The main purpose of Circuits is to learn new things, not a competitive contest. It has a wide time, so it's not to examine your ability or speed. It's for learning new things and become better.

    I didn't saw any of the problems before in online judges. But yes, to be fair, problems 2, 3, 7 were classical, it's the purpose of Circuits contests.

    I'm honored to have your ideas to make our contest better.

    Thanks for your feedback :)

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      5 years ago, # ^ |
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      @Arpa None of the editorials have even a single line of explanation. All they have is lines of code. Please look into the matter.

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        5 years ago, # ^ |
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        Please wait for several hours. Thanks for your patience.

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

    i solved GCD problem because of your mobius inversion blog. XOR paths was new to me(xor fft ), Queries problem is also interesting too , can u tell where did u find it ?

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5 years ago, # |
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How to get 100 points in Queries Problem? I got only 60 points by changing values to logarithms and then using binary search over a fenwick tree.

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

    try this test case 1 1 1 1 100

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

    The test cases are wrong. You'll lose precision while taking double. You'll have to submit multiple times, to guess what author has done, to get all 100 points.

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

Can you please update the post with the link of editorial.

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

    Editorials are in the editorial section of problems in the contest dashboard (example).

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