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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排序算法
｜
81
排序算法
sort (A)
if A has less than 2 elements then
return A
else if A has 2 elements then
swap elements of A if out of order
return A
sub1 = sort(left half of A)
sub2 = sort(right half of A)
merge sub1 and sub2 into new array B
return B
end
每次递归调用
sort
都需要等同于数组大小即
O
(
n
)
的空间，而这样的递归调用次数为
O
(log
n
)
，因此这种实现所需的存储空间为
O
(
n
log
n
)
。所幸的是，有一种方法只需要使
用
O
(
n
)
的存储，现在就让我们来看一看。
4.8.2 输入 / 输出
sort
的输出结果借用了原始集合
A
，因此不需要使用内部的存储
备份
。
归并排序算法小结
最好情况、平均情况和最坏情况：
O
(
n
log
n
)
sort (A)
copy = copy of A
❶
mergeSort (copy, A, 0, n)
end
mergeSort (A, result, start, end)
❷
if end - start < 2 then return
if end - start = 2 then
swap elements of result if out of order
return ...
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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.