<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>剪枝 on 111qqz's blog</title><link>https://111qqz.com/en/tags/%E5%89%AA%E6%9E%9D/</link><description>Recent content in 剪枝 on 111qqz's blog</description><generator>Hugo -- gohugo.io</generator><language>en</language><copyright>© 2015-2026 111qqz</copyright><lastBuildDate>Fri, 27 May 2016 12:38:07 +0000</lastBuildDate><atom:link href="https://111qqz.com/en/tags/%E5%89%AA%E6%9E%9D/index.xml" rel="self" type="application/rss+xml"/><item><title>hdu 3225 Flowers Placement （dfs+匈牙利算法剪枝，太神了）</title><link>https://111qqz.com/en/post/acm-icpc/2016/2016-05-27-hdu-3225/</link><pubDate>Fri, 27 May 2016 12:38:07 +0000</pubDate><guid>https://111qqz.com/en/post/acm-icpc/2016/2016-05-27-hdu-3225/</guid><description>&lt;p&gt;&lt;a href="http://acm.hdu.edu.cn/showproblem.php?pid=3225" target="_blank" rel="noreferrer"&gt;hdu 3225题目链接&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;题意：给出一个n*m的矩阵。每个格子有一个数。每行1..n必须每个出现一次。每列1..n每个数最多出现一次。现在要添加一行，并且补违反上述规则。问添加的方案中字典序第k小的方案。如果一共不足k种方案，那么输出-1.&lt;/p&gt;</description></item></channel></rss>