yermak0v's blog

By yermak0v, 8 years ago, translation, In English

Just now ends Procon 2013 on Codechef
I propose to discuss here problem solving. How solve 1-st?

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8 years ago, # |
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Just backtrack all possible permutations recursively (remembering rooms for each person at the same time). At the end, check all the rules. Print the first good result.

How to solve PC04? I think, that the hardest part was to match if the given figure is QUADRILATERAL or NONE. How to do that easily?

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    8 years ago, # ^ |
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    you should check 3 things:

    1. Any 3 points is on 1 line

    2. Any two points coincides

    3. Any two not adjacent side of QUADRILATERAL intersects (I don't mean their continuation) , AB intersects CD or BC intersects AD

    If any from this 3 happens its not QUADRILATERAL else it is