egor.anisevich's blog

By egor.anisevich, history, 5 months ago, translation, In English

Hello, Codeforces!

On wednesday, 10 june 2020 y. on 17:35 (UTC + 3) will take place End of the learning — Beginning of the tour contest (Div 3).

This is my first round (mashup, because for creating trainings I haven't got rating, because I need to stop writing contests on the phone) with my tasks. Competition will be held according to the rules of ICPC. Penalty for every wrong submission is 20 minutes. 20 minutes before contest table will be freezed.

You will be given 6 tasks and 2 hours. I wish you like it. I have high hopes for E task.

Ahmad Ahmadsm2005 Said, Ahmed fouad. Fouad, Matvey Asgio Kulinich and Maxim Xennon Karpuk helped me with testing tasks. Also thanks to Mike MikeMirzayanov Mirzayanov for systems Polygon and Codeforces!

I wish you luck!

I almost forgot about link:

https://codeforces.com/contestInvitation/4036ec99932a47484351d57a812de34c7a4fbb2c

Here is editorial

 
 
 
 
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4 months ago, # |
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Is the time UTC+9?

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4 months ago, # |
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Isn't the penalty set to 20 minutes (in the contest)?

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    4 months ago, # ^ |
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    why?

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      4 months ago, # ^ |
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      I'm not saying that it should be, I'm saying that it is, even though you mention the penalty is 10 minutes.

      For example, see my score:  (if it's blurry, https://imgur.com/a/JpaNEYU)

      My solve times are 1 + 3 + 5 + 7 + 13 + 18 = 47, meaning that my 3 penalties are each causing 20, not 10 as they should.

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4 months ago, # |
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How to solve F?

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4 months ago, # |
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egor.anisevich, is it okay if I post a brief editorial here for everyone (since submissions are public now)?

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4 months ago, # |
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Slight editorial (with author permission):

A
B
C
D
E
F
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    4 months ago, # ^ |
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    Hello! How you did these opening triangles?

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    4 months ago, # ^ |
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    You can public it in your blog, I will add link

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    4 months ago, # ^ |
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    I will do editorial on russian lenguage then

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    4 months ago, # ^ |
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    For F when you turn right you go to another tunnel.So for p1 shoudn't it be 100-a1 for ending in that tunnel and then advancing for 2nd tunnel you should have a1 chance for that ? Or I have misunderstood the question

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      4 months ago, # ^ |
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      The statement's not the clearest, but I interpreted "turn right" from On every turn person can turn right with probability a [i] as "end at that tunnel with probability $$$a_i$$$" and "go straight" as "continue to the next tunnel"

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        4 months ago, # ^ |
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        Yes, you're right!

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        4 months ago, # ^ |
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        "the tunnel with n turns, which lead right, in other tunnels" This statement made me think you have to turn right to go to another tunnel

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    4 months ago, # ^ |
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    Why did you took the path from (1,1) to (i,j) ?I mean what's the reason or intuition behind this.Thanks in advance

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      4 months ago, # ^ |
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      Unfortunately, there isn't much intuition. The best I can say is "I've seen this problem before, so I recognized it quickly."

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    4 months ago, # ^ |
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    Can you make it a blog?

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4 months ago, # |
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I think you meant editorial here too instead of parse.

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4 months ago, # |
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Some suggestions:

  1. Try to use MathJax format. For example, something like 1<=n<=1e5 should be $$$1 \le n \le 10^5$$$(use single dollar sign, but not 3 dollar signs) which will be displayed as $$$1 \le n \le 10^5$$$

  2. Try to spell key words correctly. ( guaranteed but not garanted)

Hope you can make better contests next time :D