Блог пользователя WXYZ

Автор WXYZ, 14 лет назад, По-английски
The types of the problems are my favourite, especially D and E.
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14 лет назад, # |
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congratulations!
but why you've created a new post about it?!
14 лет назад, # |
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I've missed it! :(
But I was surprised that there are 3 more contests in the next few days!
14 лет назад, # |
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Aha, you are earning your contributions back.

And you lost your bet, you just fail to go beyond me in just two contests. =w=
Though I think you'll soon became red. 

  • 14 лет назад, # ^ |
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    I am red now....
    Why don't you participate in round #68....
    Because of the paper?
14 лет назад, # |
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Would you like to explain how to solve D and E? I don't think there is an editorial yet and I'm quite interested in the problems.
  • 14 лет назад, # ^ |
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    Problem D: If k is 1, it is obviously that only two provinces can remain after building the roads. If k is bigger than 1, we can build tunnels between the provinces that contain two or more cities to make them like a link, and all the other cities can build tunnel should more that the provinces contains only 1 city, if not, we should build a road between two provinces with 1 city.

    Problem E: All the prime less than x should be chosen. Because a prime P can only tell from P+1 with P.

    My poor English......