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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AI
寻路
｜
167
AI
寻路
return [null, score]
foreach valid move m for player in state s do
execute move m on s
[move, score] = minimax(s, ply-1, opponent, player)
❸
undo move m on s
if player is original then
❹
if score > best.score then best = [m, score]
else
if score < best.score then best = [m, score]
return best
end
❶
记住
先行玩家，因为总是从他的角度来评估棋局。
❷
如果无法继续移动或者
ply
为
0
，那么玩家可能已经获胜（或者失败）。
❸
每次递归的时候，交换
player
和
opponent
变量，以反映交替。
❹
然后每一层在
MAX
和
MIN
层级之间变换。
图
7-3
给出了如何在
ply
为
3
时使用
Minimax
来评估可能的走法。最下面一行给出了当
执行某个走法时可能产生的
5
种棋局。每一种棋局的得分都是从玩家的角度来评估。第
三行的
MAX
得分是其子结点得分的最大值，即从这个结点开始，玩家能得到的最好的
棋局。同理，第二行的
MIN
得分是其子结点得分的最小值，即从这个结点开始，玩家有
可能面对的最坏棋局。可以看到，每一层交替选择子结点的最大值或者最小值。所以最 ...
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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.