witua's blog

Codeforces Beta Round #77
By witua, 15 years ago, translation, In English
Hello everyone!

Welcome to Codeforces Beta Round #77. I am Vitaliy Gerasimov (witua) and I am an author of today's problems. Thanks to Artem Rakhov (RAD) and Pavel Kuznetsov (it4.kp) for the help and advices in preparing of the rounds, Maria Belova (Delinur) for the problem translation and Codeforces (CF) for being.


Good luck!
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  • +160
  • Vote: I do not like it

Comments Comments (107)
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15 years ago, hide # |
← Rev. 3  
Vote: I like it 0 Vote: I do not like it

gl & hf!

P.S. разбаловка  обычная?
P.P.S. Sorry, this comment must be in russian, not in english
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15 years ago, hide # |
 
Vote: I like it -11 Vote: I do not like it
May be one of the problems on "lucky numbers" ?... looks like it.
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15 years ago, hide # |
 
Vote: I like it -6 Vote: I do not like it
How many minutes before the round, the problemset is disabled ?
(I just read 1 problem and wrote the solution, and when I clicked submit , it was disabled. So thought , it would be good to know exact timing.)
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15 years ago, hide # |
 
Vote: I like it +9 Vote: I do not like it
Fighting!
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15 years ago, hide # |
 
Vote: I like it +4 Vote: I do not like it
Good Luck everyone !  /Амжилт! in Mongolian/ :)
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15 years ago, hide # |
 
Vote: I like it +1 Vote: I do not like it
where is the list of registered contestants?
I can't submit because apparently I'm not registered.
I thought I did register...
Thanks
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  • 15 years ago, hide # ^ |
     
    Vote: I like it +5 Vote: I do not like it
    Was it because you were not logged in *WHEN* you clicked the "register" button?

    If it was so, you would not be directed to the registration page. I missed two or three contests because of this reason...
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15 years ago, hide # |
 
Vote: I like it +1 Vote: I do not like it
This is the second time I can't submit on CF in a contest, I guess there's something wrong with my Internet...
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15 years ago, hide # |
 
Vote: I like it +3 Vote: I do not like it
Now I understand why the problem with the lucky number. It's so great.
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15 years ago, hide # |
 
Vote: I like it 0 Vote: I do not like it
Won't have much time to solve E :(
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15 years ago, hide # |
← Rev. 2  
Vote: I like it +20 Vote: I do not like it

Div2.C is too hard to understand.
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15 years ago, hide # |
 
Vote: I like it +11 Vote: I do not like it
Div2 C problem.
if (w[i] == letter && letter == 'a') replace_with('b')
is awesome tricky :)
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15 years ago, hide # |
 
Vote: I like it -52 Vote: I do not like it
I think that the user 

wclee2265

is a cheater. He has only one minute between two submits for problems A and B (Div 2). More than that, he solved them quite late. The source code for problem B is quite huge. Admins, please, check this out :) 
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15 years ago, hide # |
 
Vote: I like it +1 Vote: I do not like it
Div2 C problem
Why the output of the third text is abCacba,not abCccba.It is hard to understand.
 
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15 years ago, hide # |
 
Vote: I like it +15 Vote: I do not like it
I just need one more second to submit D .........T___T
When I submited it after the contest, it got Accepted.....
My heart broke ...........

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15 years ago, hide # |
 
Vote: I like it +16 Vote: I do not like it
Hi, did anyone else have problems with loading the page in the beginning of the contest? It took me 3 minutes to be able to access the contest.
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15 years ago, hide # |
 
Vote: I like it +6 Vote: I do not like it
What was the point distribution for the problems in both Div1 and Div2?
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15 years ago, hide # |
 
Vote: I like it 0 Vote: I do not like it
My Div2.C had a one character bug T_T

This line...
printf("%c", (letter!='A')?'A':'B');

...should be...
printf("%c", (letter!='a')?'A':'B');

...to get Accepted :'(
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15 years ago, hide # |
 
Vote: I like it +11 Vote: I do not like it
@witua, thank you for this nice contest. I enjoy it a lot. Waiting for the editorial.
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15 years ago, hide # |
 
Vote: I like it 0 Vote: I do not like it
Yet again "an one-liner stupidity" failed my C :( :(.
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15 years ago, hide # |
 
Vote: I like it +4 Vote: I do not like it
This is the first time I can be a red coder. Nice contest, I really like the "lucky numbers" problems both in TC and CF. Thank you author
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15 years ago, hide # |
 
Vote: I like it 0 Vote: I do not like it
What is test #52 in problem 95B (B, div 1) ?
Cause, I cannot find mistake for about a hour, and I really want to sleep xD
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15 years ago, hide # |
 
Vote: I like it +17 Vote: I do not like it
I have just noticed this, Codeforces Beta Round #77, it's a lucky number :)
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15 years ago, hide # |
 
Vote: I like it +3 Vote: I do not like it

Div 2 problem D is very nice. Thank you  the author! This problem can train ours ability of thinking about the problem completely.I learned a lot after AC this problem.

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15 years ago, hide # |
 
Vote: I like it +1 Vote: I do not like it
Is the editorial out yet?
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15 years ago, hide # |
 
Vote: I like it +3 Vote: I do not like it
For me, Div1C/Div2D is easier than Div1B. Latter is just trickier.
Or maybe there is clear implementation to solve it.
Anyway, lucky number reminds me of TopCoder.

For Div1A/Div2C, first I think only given letter is important, so wondered why sample gives upper case letter instead of 'A'.
I think it would be good to add the statement "Both uppercase and lowercase letter are important." to clarify the problem.

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15 years ago, hide # |
← Rev. 5  
Vote: I like it 0 Vote: I do not like it

who can help me solve the DIV1-D problem?I got TLE,55555555
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15 years ago, hide # |
 
Vote: I like it +5 Vote: I do not like it
When will the editorial for beta round - 77 be released..??
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15 years ago, hide # |
 
Vote: I like it +3 Vote: I do not like it
thnx (imslavko + google translate) :)
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15 years ago, hide # |
 
Vote: I like it +3 Vote: I do not like it
well, since a lot of coders are not from Russia and hence don't understand Russian- quick skimming through rating pages by country says that non-Russian coders are half of the coders here-, why is the editorial not written always in English ? why writing it in Russian in the first place ? 
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15 years ago, hide # |
 
Vote: I like it 0 Vote: I do not like it
Div1 D - In the first paragraph 412395497 is given as nearly lucky for k=2. The first digit of the number is 4 and it does not have another lucky number within distance 2. Can someone explain how this is nearly lucky number?
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