Seyaua's blog

By Seyaua, 7 years ago, translation, In English,
Hello!

I invite you all to take part in significant round! Today will be the first round for second division in Codeforces history, when it will be rated for blue coders!

This time the problems are written by me and sdya
We thank Artem Rakhov, Maria Belova and Dmitry Matov for help in preparing of this round.

Good luck for all!

UPD #1: Congrats to Kepnu4, who won the second division and to cerealguy, who won this round!

UPD #2: Link to editorial.
 
 
 
 
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7 years ago, # |
  Vote: I like it +4 Vote: I do not like it

YES

First Div 1 : Codeforces Beta Round #39

and now

First Div2 : Codeforces Beta Round #61 (Div. 2)

Good Luck man ..... :D
7 years ago, # |
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If  you  want know about  freedom in a country. Go and ask for women of the country.

Happy  Women Day!!(8 March)

7 years ago, # |
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Nice problems. Good job , guys
7 years ago, # |
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so many problems were solved with BigInteger....


  • 7 years ago, # ^ |
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    I feel a litlle unfair about D because a solution using BigInteger is too much easier to come up with.
    (I usually use C++ but used ruby to solve D.)

    But thanks for a nice contest! I really had fun.
    • 7 years ago, # ^ |
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      C++ can also solve this problem without a biginteger ...
      you can make the first three number 6 , 10 , 15  and then the numbers follow are 15*2^1 ,15*2^2,15*2^3 and so on
  • 7 years ago, # ^ |
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    That's why CPP programmers must always have their BigInteger codes ready
7 years ago, # |
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  1. if(s.length()<=19)
  2.                   {
  3.                           d=0;
  4.                       for(i=0;i<s.length();i++)d=10*d+int(s[i])-48;
  5.                           if(d<=9223372036854775807LL)cout<<"long"<<endl;else cout<<"BigInteger"<<endl;
  6.                   }else
  7.                           cout<<"BigInteger"<<endl;
  8. Please, tell me why this code work on test "9999999999999999999" (9x19)?
  • 7 years ago, # ^ |
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    Because d is unisgned long long and every number of length <= 19 fits in it
    • 7 years ago, # ^ |
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      Oh, really... I think max value for unsigned long long has 18 digits :(
      Dull mistake. Thx.
      • 7 years ago, # ^ |
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        о_О Приятно увидеть что кого-то мой код всё-таки обманул кого-то :) 
  • 7 years ago, # ^ |
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    There is a very easy way to answer this question using casts.
7 years ago, # |
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twitpic I messed around A due the a quick misinterpretation of minus symbol as dash (hyphen). I request from next time on while writing out negative numbers, don't put a space or linebreak between the minus symbol and the number, so that the negation remains intact and I (lol, just for me) don't get confused. 

:(
7 years ago, # |
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thnx for nice contest :)
7 years ago, # |
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it was a really nice contest...except for problem c that i didn't even try to solve it!!

i actually hate text ones.

thanks every one

7 years ago, # |
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someone has accidentally swapped C and D problems :D
7 years ago, # |
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What's wrong with problem C in these div.2 contests? #57 was just as bad as this one
7 years ago, # |
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loved the contest. thanks for nice contest :).
also, Is it possible to see the test cases ? otherwise can you please share test case #71.
  • 7 years ago, # ^ |
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    forgot to mention for problem C.
  • 7 years ago, # ^ |
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    test case #71 is tricky one. In this test case there are some files with pathes like:
    C:\1\...
    C:\111\...
    If you sort this pathes you obtain bad results.
7 years ago, # |
Rev. 3   Vote: I like it +3 Vote: I do not like it
Why each test case is given twice to each code?
7 years ago, # |
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for problem D, 
use 6,10,15, and 6*n (2<=n<= around 60)
can generate the required result
7 years ago, # |
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I do not really like long arithmetic in programming. anyways awesome job guys.
7 years ago, # |
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I feel that contests on codeforces are based a lot on string manipulations which becomes a lot easier for advanced coders who are used to STL data types. At least Div. 2 problems should not have so many questions like that.
7 years ago, # |
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Please use Codeforces.com for linking the names to their profiles in English posts, Thanks.