ahmed_aly's blog

Codeforces Beta Round #67 (Div. 2)
By ahmed_aly, 13 years ago, In English
Hi everyone,

Today I'll be the author for this round, and it's my first time to be an author in Codeforces. I hope you will like the problems and find it interesting, even for Div1 coders.

I would like to say thanks for Artem Rakhov for solving and testing the problems, for Maria Belova for preparing the problem statements, and for Mike Mirzayanov for this great system.

Good luck and have fun.

Edit 1: Congratulation to the winner Chubcheg.
Edit 2: The problem editorial is here.
  • Vote: I like it
  • +99
  • Vote: I do not like it

Comments Comments (17)
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13 years ago, # |
  Vote: I like it +4 Vote: I do not like it
I hope that it will be interesting) Good luck to all!
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13 years ago, # |
  Vote: I like it +8 Vote: I do not like it
Good luck, everybody! Let's have fun, writing this contest.
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13 years ago, # |
  Vote: I like it +10 Vote: I do not like it
I liked this contest :) Problems were very interesting. Thanks author for good pretests.
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13 years ago, # |
  Vote: I like it +5 Vote: I do not like it
I found problems really nice and interesting, no ambiguity, Thanks ahmed_aly for that round :)
great div 2 contest where one can try his best at hacks with no fear ...
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13 years ago, # |
  Vote: I like it 0 Vote: I do not like it
My submission for problem A shows wrong answer on pretest 3->544 397.
the correct answer is YES and my program gives the same but in the checker log its showing NO. I dont understand?
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13 years ago, # |
  Vote: I like it 0 Vote: I do not like it
All names in the input will consist of at least 1 letter and at most 10 small Latin letters.
problem B's data is correct??!!!!!
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  • 13 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it
    It should be. Did you find any test case which violates this rule?
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    • 13 years ago, # ^ |
        Vote: I like it 0 Vote: I do not like it

      I observation data.
      Start each line will have a redundant Spaces. Or is my IE wrong?

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  • 13 years ago, # ^ |
      Vote: I like it +3 Vote: I do not like it
    The test cases are correct
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13 years ago, # |
  Vote: I like it +3 Vote: I do not like it
Nice problemset.
Thanks for this round.
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13 years ago, # |
← Rev. 2   Vote: I like it +5 Vote: I do not like it
Good Job Ahmed_Aly and Team . Overall Well Conducted round !
offtopic , @Ahmed , in problem D :
"Their coach Fegla asked them to solve one challenging problem, of course Ahmed was able to solve it but Mostafa couldn't."

"of course " ...hmmm....  :D
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  • 13 years ago, # ^ |
      Vote: I like it +18 Vote: I do not like it
    By the way, Mostafa was in this contest, and he didn't solve this problem. It was just a joke with my best team-mate ever. :)
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13 years ago, # |
  Vote: I like it 0 Vote: I do not like it
Ta7nk u
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13 years ago, # |
  Vote: I like it 0 Vote: I do not like it
Nice problems indeed. However, in prob D, it wasn't clear whether the result could be negative too. If we assume empty set as a valid subset, the answer could be 0 in case all the elements are negative. My solution failed the pretests on this case alone.

Also, I decided to try hacking solutions in my room in the last 8 minutes. So, I clicked on 'Room' and I was redirected to 'Room 51' (not my room) but the rank list showed whole division's list. I tried this 10-15 times, but no help. So I began searching my room by visiting each room and ran out of time. :(
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  • 13 years ago, # ^ |
      Vote: I like it +6 Vote: I do not like it
    Actually there was direct note that subset cannot be empty
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    • 13 years ago, # ^ |
        Vote: I like it 0 Vote: I do not like it
      You're right. I skipped the Output section in hurry. My bad.
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