August 2017
Intermediate to advanced
360 pages
8h 35m
Chinese
Content preview from 算法技术手册（原书第2 版）
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用算法的眼光去看问题
｜
9
用算法的眼光
去看问题
慢凸包算法小结
最好情况、平均情况和最坏情况：
O
(
n
4
)
slowHull (P)
foreach p0 in P do
foreach p1 in {P-p0} do
foreach p2 in {P-p0-p1} do
❶
foreach p3 in {P-p0-p1-p2} do
if p3 is contained within Triangle(p0,p1,p2) then
mark p3 as internal
❷
create array A with all non-internal points in P
determine leftmost point, left, in A
sort A by angle formed with vertical line through left
❸
return A
❶
点
P
0
、
P
1
和
P
2
组成一个三角形。
❷
没有
被标记为内部点的点肯定在凸包上。
❸
形成的角度范围从
-90
°
~90
°。
在下一章中，我们将从数学的角度解释为什么这个方法非常低效。这段伪代码摘要解释
了如何针对每个输入集生成一个凸包，特别是，像图
1-2
所示的凸包。不过，难道没有
更好的做法了吗？
1.3 高明做法
本书介绍的大量算法都是在现有代码基础上对高效解法不懈追求的结果。我们努力地将
这些算法实现为可用的代码，并尽量给出一些能够解决现实问题的算法。例如，对于凸 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.