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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184
｜
第
7
章
if closed doesn't contain nextState then
nextState.depth = n.depth + 1
❸
if nextState = goal then return "Solution"
if nextState.depth < maxDepth then
insert (open, nextState)
❹
return "No Solution"
end
❶
深度优先搜索
使用栈来存储那些要被访问的开集状态。
❷
将下一个要访问的状态从栈中弹出。
❸
深度优先搜索
不会越过
maxDepth
。
❹
将下一个状态加入开集
open
中，使用
push
操作，因为
open
是一个栈。
深度优先搜索
维护一个栈，即开集
open
（
保存未访问过的棋局状态）和 一个闭集
closed
（
保
存已经访问过的状态）。在每次迭代时，
深度优先搜索
从栈中弹出一个未访问的棋局状态，
然后从这个棋局状态开始扩展，根据走法计算其后继棋局状态。如果达到了目标棋局状
态，搜索终止。算法在扩展时，对于任何后继棋局状态，如果检查发现它已经在闭集中，
那么算法就会抛弃这个状态，而未访问棋局状态会被压入栈中，以供后续搜索。
如图
7-15
所示，在一个八数码问题中，限定最大深度为
9
，从初始棋局状态开始计
算出一棵搜索树。可以看到，虽然有些地方已经扩展到深度
9
，但是找到解（标记为
GOAL
）只需经过
8
步。在这棵树中，总共访问了 ...
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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.
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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.