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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空间树结构
｜
273
空间树结构
最近邻算法小结
最好情况和平均情况：
O
(log
n
)
最坏情况：
O
(
n
)
nearest (T, x)
n = find parent node in T where x would have been inserted
min = distance from x to n.point
❶
better = nearest (T.root, min, x)
❷
if better found then return better
return n.point
end
nearest (node, min, x)
d = distance from x to node.point
if d < min then
result = node.point
❸
min = d
dp = perpendicular distance from x to node
if dp < min then
❹
pt = nearest (node.above, min, x)
if distance from pt to x < min then
result = pt
min = distance from pt to x
pt = nearest (node.below, min, x)
if distance from pt to x < min then
result = pt
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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.