red_coder's blog

Cool Geometry....
By red_coder, 12 years ago, In English

hey guys i am stuck with this geometry problem. I tried the editorial but the explanation is not at all understandable. I also tried to understand from the submitted codes but not able to understand much. Can anyone please explain in a nice manner how to solve this problem...http://codeforces.net/contest/280/problem/A

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12 years ago, # |
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firstly u must find points of rotated rectangle , then find the points that intersect with first rectangle lines and rotated rectangle lines then make simple polygon area with k points.

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12 years ago, # |
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As you read from the nice tutorial, there are two cases. The second case isn't too hard to find the area of the parallelogram. I will talk about the first case: how to find the area of the four triangles? They are calculated in the similar way. I think you can get the idea from this picture and my code.

Here is my solution 3363199

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    12 years ago, # ^ |
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    why do you use swap function?

    I have also incorporated swap func but just after I realized my code didn't work well when w<h :D:D

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      12 years ago, # ^ |
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      Just for simplicity, I want to keep the height less than or equal to the width as I was reasoning my code

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    12 years ago, # ^ |
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    thanks a lot dude excellent explanation. But can u please tell how to calculate the area for the second case.

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