5.4最小生成树
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对于这个普里姆算法,书上讲的有些不太细致,主要表现在U和TE的定义,以及对于辅助数组的作用的说明(也可能是我的理解能力差吧.).我看了两天都没有看明白书上的算法,我参考了严蔚敏的数据结构后,才逐渐的明白.
我对于书上不明白的地方写一下我自己的认识:
(1)U:是指对于新增加的顶点的集合,那么在初始状态时,我们加入一个新的顶点时,它的集合为:U={u0}.
(2)TE:是指最小生成树边的集合,也就是使权最小的边的集合.
(3)V-U:指在所有顶点中,去除U后所剩的顶点.
那么普里姆算法中,最简洁明了的说明是:"每新增一个顶点,就找到这个顶点到其它顶点的最小权,来更新辅助数组中的权值".这就涉及到了这个辅助数组的作用:
(4)辅助数组closedge:closedge数组的长度顶点的数量,其中记录的是U中顶点对V-U中顶点连通的权值.那么这个数组的更新就是在每向U中增加一个顶点的时候,就从这个新的顶点找到它与其它顶点连通的边的权值,与辅助数组中的记录的上次的顶点的权值做一个比较,如果小则更新之.在辅助数组中,lowcost=0代表此结点已经加入U中(例如closedge[0].lowcost=0,说明V0顶点已经加入到U中),lowcost=MAX表示尚未连通此顶点.
以我上面实现的代表为例,辅助数组的变化情况如下表:
|
V0 |
V1 |
V2 |
V3 |
V4 |
V5 |
U |
|||
Adjvex lowcost |
V0 0 |
V0 6 |
V0 1 |
V0 5 |
V0 ∞ |
V0 ∞ |
V0 |
|||
Adjvex lowcost |
V0 0 |
V2 5 |
V0 0 |
V0 5 |
V2 6 |
V2 4 |
V0,V2 |
|||
Adjvex lowcost |
V0 0 |
V2 5 |
V0 0 |
V5 2 |
V2 6 |
V2 0 |
V0,V2,V5 |
|||
Adjvex lowcost |
V0 0 |
V2 5 |
V0 0 |
V5 0 |
V2 6 |
V2 0 |
V0,V2,V5,V3 |
|||
Adjvex lowcost |
V0 0 |
V2 0 |
V0 0 |
V5 0 |
V1 3 |
V2 0 |
V0,V2,V5,V3,V1 |
|||
Adjvex lowcost |
V0 0 |
V2 0 |
V0 0 |
V5 0 |
V1 0 |
V2 0 |
V0,V2,V5,V3,V1,V4 |
一点说明:为什么在标题中要嵌入英文?原因是为了能够让国外的网友能查询到这篇文章。平常在Google上查资料的时候,经常参考国外网友的博客,帮助我解决了很多问题,所以我也想让他们能够参考我写的内容。当然文中我不可能全部译为英文,所以我尽量把代码粘全,靠代码说话吧。