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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搜索算法
｜
125
搜索算法
remove
的代码和
add
类似，一旦递归搜索找到了包含欲移除值的目标结点，它需要检查
左子树的最大元素并且替换。随着递归结束之后一层层的回调，我们可以看到代码在不
断地检查每一层是否需要执行旋转操作。由于树的深度至多为
O
(log
n
)
，而且每次旋转
为常数时间，因此删除的时间为
O
(log
n
)
。
最后我们需要做的就是提供方法能让用户有序地访问元素——散列表根本不支持这样的
操作。例
5-17
给出了中序遍历的实现。
例
5-17
：中序遍历的实现
class BinaryTree:
def __iter__(self):
"""
开始中序遍历
"""
if self.root:
return self.root.inorder()
class BinaryNode:
def inorder(self):
"""
中序遍历以给定结点为根的树
"""
if self.left:
for n in self.left.inorder():
yield n
yield self.value
if self.right:
for n in self.right.inorder():
yield n
我们可以用这个实现来有序地打印出
BinaryTree
的所有值。如例
5-18
的代码段所示，
在空
BinaryTree
中
加入了
10
个整数（逆序），然后将它们打印出来。
例
5-18
：遍历
BinaryTree
的所有值 ...
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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.