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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190
｜
第
7
章
广度优先搜索小结
最好情况、平均情况和最坏情况：
O(
b
d
)
search (initial, goal)
if initial = goal then return "Solution"
open = new Queue
❶
closed = new Set
insert (open, copy(initial))
while open is not empty do
n = head (open)
❷
insert (closed, n)
foreach valid move m at n do
nextState = state when playing m at n
if closed doesn't contain nextState then
if nextState = goal then return "Solution"
insert (open, nextState)
❸
return "No Solution"
end
❶
广度优先搜索
使用队列来存储开集中的状态。
❷
从队列中删掉最旧的状态。
❸
插入操作会追加到
开集
尾部。
7.8.3 解决方案
广度优先搜索
在使用队列结构来存储状态的
开集
，每次从队列头中取出一个状态。
闭集
用散列表结构存储。每个棋局状态都有一个称为迁移链（
Transition
）的回链，这个链接
记录的是哪一步走法以及是从哪一个状态来得到当前棋局状态的。
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