Alex_KPR's blog

By Alex_KPR, 10 years ago, translation, In English,

Hi, everybody, and welcome to the Codeforces Beta Round #9!

I'm its author. :) I've tried to make problems easy to read and funny. I’d like to say thank you to Mike Mirzayanov (for choosing problems for the contest and everything he’s done to organize it), to Igor Kudryashov (for checking author's solutions and making test generators), to Dima Matov (for correcting everything :)) and, of course to Julia Satushina (for excellent translations of the problems’ legends).

I'd like to remind you that if you have any questions on the problems, the best way to ask them is to use the web interface on the problems page.

I believe that the contest will be interesting to you, dear participants! I’m looking forward to seeing your suggestions here.

Good luck!

 
 
 
 
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10 years ago, # |
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I can't submit: I need to be registered for the contest (the message says).

AFAIK, this contest is not a TopCoder contest where registration is needed to assign rooms. 

I fail to see why do we need to register before the contest?
  • 10 years ago, # ^ |
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    I dont know but you need to register, it is simple a rule.
10 years ago, # |
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Thank you Alex_KPR! Your help is very important for Codeforces. Happy Birthday!
10 years ago, # |
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Problem A. Die Roll
"It is known that Yakko and Wakko are true gentlemen, that's why if they both have the same amount of points with Dot, they will let Dot win."
The both word is unnecessary and injurious.
But maybe I'm wrong.
  • 10 years ago, # ^ |
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    hmm... it's my mistake, I'm sorry

    you are right, thanks

    • 10 years ago, # ^ |
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      ... it's my fault :(( I must have read the Russian statement not carefully enough. I thought the males should have the same amount of points at the same time.

      So, Alex, you shouldn't have thanked me :'(

      • 10 years ago, # ^ |
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        Your mistake is a very small epsilon of countable, but very big piece of goods You made.

        This problem was the most AC'eeded in the contest. Don't punish yourself too much.

      • 10 years ago, # ^ |
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        That's OK, I see that almost everyone figured it out eventually ;)
10 years ago, # |
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How can i solve "problem c: Hexadecimal nos".
I solve it using  sprintf() all the number from 1 to n, then searching those numbers which have digits other than '1' or '0' ( in that case i didnot increment the counter) otherwise i incremented the counter.

My code passed cases till case 14 where it gave "time limit exceeded"
Thanks
  • 10 years ago, # ^ |
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    But n can be as large as 109, so testing them all is not a good idea.

    Hint: try "thinking backwards".
10 years ago, # |
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I've just noticed that an invitation email was sent to me although I'm not eligible for this contest.
10 years ago, # |
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Can some one explain me how to solve the fourth problem? I am confused.