﻿<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>C++博客-yzhw@ujs code my life~-文章分类-graph theory</title><link>http://www.cppblog.com/yzhw/category/15170.html</link><description /><language>zh-cn</language><lastBuildDate>Fri, 29 Oct 2010 04:58:45 GMT</lastBuildDate><pubDate>Fri, 29 Oct 2010 04:58:45 GMT</pubDate><ttl>60</ttl><item><title>Stoer_Wagner 算法，求无向图的最小割</title><link>http://www.cppblog.com/yzhw/articles/131264.html</link><dc:creator>yzhw</dc:creator><author>yzhw</author><pubDate>Mon, 25 Oct 2010 15:46:00 GMT</pubDate><guid>http://www.cppblog.com/yzhw/articles/131264.html</guid><wfw:comment>http://www.cppblog.com/yzhw/comments/131264.html</wfw:comment><comments>http://www.cppblog.com/yzhw/articles/131264.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.cppblog.com/yzhw/comments/commentRss/131264.html</wfw:commentRss><trackback:ping>http://www.cppblog.com/yzhw/services/trackbacks/131264.html</trackback:ping><description><![CDATA[<font face="楷体_GB2312" size="3">&nbsp;  prim算法不仅仅可以求最小生成树，也可以求&#8220;最大生成树&#8221;。最小割集Stoer-Wagner算法就是典型的应用实例。</font>
<p><font face="楷体_GB2312" size="3">&nbsp;&nbsp;&nbsp;  求解最小割集普遍采用Stoer-Wagner算法，不提供此算法证明和代码，只提供算法思路：</font></p>
<p><font face="楷体_GB2312" size="3">1.min=MAXINT，固定一个顶点P</font></p>
<p><font face="楷体_GB2312" size="3">2.从点P用类似prim的s算法扩展出&#8220;最大生成树&#8221;，记录最后扩展的顶点和最后扩展的边</font></p>
<p><font face="楷体_GB2312" size="3">3.计算最后扩展到的顶点的切割值（即与此顶点相连的所有边权和），若比min小更新min</font></p>
<p><font face="楷体_GB2312" size="3">4.合并最后扩展的那条边的两个端点为一个顶点（当然他们的边也要合并，这个好理解吧？）</font></p>
<p><font face="楷体_GB2312" size="3">5.转到2，合并N-1次后结束</font></p>
<p><font face="楷体_GB2312" size="3">6.min即为所求，输出min</font></p>
<p><font face="楷体_GB2312" size="3">prim本身复杂度是O(n^2)，合并n-1次，算法复杂度即为O(n^3)</font></p>
<p><font face="楷体_GB2312" size="3">如果在prim中加堆优化，复杂度会降为O((n^2)logn)</font></p>
<p><br></p>
<p><font face="楷体_GB2312" size="3">
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<br></font></p><img src ="http://www.cppblog.com/yzhw/aggbug/131264.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.cppblog.com/yzhw/" target="_blank">yzhw</a> 2010-10-25 23:46 <a href="http://www.cppblog.com/yzhw/articles/131264.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>