feat: finish hw2
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# HW2
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## Problem 1
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- 1.
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Points:
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| index | position |
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| ----- | -------- |
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| 0 | (3, 1) |
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| 1 | (4, 4) |
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| 2 | (5, -1) |
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| 3 | (2, -1) |
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| 4 | (2, 2) |
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| 5 | (2, 1) |
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| 6 | (4, -1) |
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| 7 | (6, 1) |
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| 8 | (8, 1) |
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| 9 | (8, 5) |
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| 10 | (7, 4) |
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| 11 | (3, 3) |
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Afer sorting:
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| index | position | deleted |
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| ----- | -------- | ------- |
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| 2 | (5, -1) | False |
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| 8 | (8, 1) | False |
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| 7 | (6, 1) | True |
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| 9 | (8, 5) | False |
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| 10 | (7, 4) | False |
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| 1 | (4, 4) | False |
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| 11 | (3, 3) | False |
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| 0 | (3, 1) | True |
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| 4 | (2, 2) | False |
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| 5 | (2, 1) | False |
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| 6 | (4, -1) | True |
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| 3 | (2, -1) | False |
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Stack history:
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| i | stack |
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| --- | ----------- |
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| 2 | 8,2 |
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| 3 | 9,8,2 |
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| 4 | 10,9,8,2 |
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| 4 | 9,8,2 |
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| 5 | 1,9,8,2 |
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| 6 | 11,1,9,8,2 |
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| 6 | 1,9,8,2 |
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| 7 | 4,1,9,8,2 |
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| 8 | 5,4,1,9,8,2 |
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| 8 | 4,1,9,8,2 |
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| 9 | 3,4,1,9,8,2 |
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image:
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![1_1_1](1_1_1.png)
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- 2.
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- 1. Because the stack only iterate through points once and exactly once, one point either push in or push in then pop out which take constant time k. So the total time is k*n which is O(n).
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- 2. Consider a square ABDC, $p_0$ and $p_1$ is A and B. Then we go to C and push it. Then D, however B-C-D makes a right turn so we pop C then push D. Then we form a convex polygon with points A,B,D, but C is not inside the polygon.
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![1_2_1](1_2_1.png)
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## Problem 2
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- 1.
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- QuickHull(p9 , p3 , {p0 , p1, p2 , p4, p5 , p6, p7 , p8, p10 , p 11, p12 })
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- QuickHull(p9 , p5 , {p4 , p11, p8 , p10})
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- QuickHull(p9 , p11 , {p4})
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- QuickHull(p11 , p5 , {p10})
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- QuickHull(p5 , p3 , {p6 , p7, p1})
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- QuickHull(p7 , p3 , {p1})
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- 2.
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- 1. Correct, this is basically the same as Graham scan.
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- 2. Wrong, counter example, c is the smallese angle but c is not a part of convex hull.
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![2_2_2](2_2_2.png)
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- 3. Correct, base on Akl–Toussaint heuristic, for a set of points, the one with the highest y coordinate must be a part of the convex hull.
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- 4. Correct, this is a Ellipse with same focuses but different axis. The one with longer axis must contain the one with shorter axis but not vise versa. Thus, the point with highest sum must be a part of convex hull.
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- 5. Wrong, same graph as question 2, C is the one with minimal distance sum however it is not a part of convex hull.
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256 768 m
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128 640 l
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<path stroke="red" arrow="normal/normal">
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240 656 m
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256 768 l
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<path stroke="red" dash="dotted" arrow="normal/normal">
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240 656 m
|
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144 752 l
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128 640 m
|
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240 656 l
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</page>
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</ipe>
|
284
HW2/hw2-quickhull.ipe
Normal file
284
HW2/hw2-quickhull.ipe
Normal file
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</page>
|
||||
</ipe>
|
Loading…
Reference in New Issue
Block a user