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<!DOCTYPE html><html class="theme-next pisces use-motion" lang="zh-CN"><head><meta name="generator" content="Hexo 3.9.0"><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=2"><meta name="theme-color" content="#222"><link rel="apple-touch-icon" sizes="180x180" href="/images/icons/favicon-48.png?v=6.7.0"><link rel="icon" type="image/png" sizes="32x32" href="/images/icons/favicon-32.png?v=6.7.0"><link rel="icon" type="image/png" sizes="16x16" href="/images/icons/favicon-16.png?v=6.7.0"><link rel="mask-icon" href="/images/icons/logo.svg?v=6.7.0" color="#222"><link rel="alternate" href="/atom.xml" title="菠菜眾長" type="application/atom+xml"><meta http-equiv="Cache-Control" content="no-transform"><meta http-equiv="Cache-Control" content="no-siteapp"><link href="/lib/fancybox/source/jquery.fancybox.css" rel="stylesheet" type="text/css"><link 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itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="菠菜眾長"></span><header class="post-header"><h2 class="post-title" itemprop="name headline">how many tables-HDU-1213(并查集求连通域数目)<a href="https://github.com/Lruihao/lruihao.github.io/tree/hexo/source/_posts/how-tables.md" class="post-edit-link" title="编辑" rel="external nofollow noopener noreferrer" target="_blank"><i class="fa fa-pencil"></i></a></h2><div class="post-meta"><span class="post-time"><span class="post-meta-item-icon"><i class="fa fa-calendar-o"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2018-07-31 11:12:10" itemprop="dateCreated datePublished" datetime="2018-07-31T11:12:10+08:00">2018-07-31</time> </span><span class="post-category"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-folder-o"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/ACM/" itemprop="url" rel="index"><span itemprop="name">ACM</span></a></span> ， <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/ACM/并查集/" itemprop="url" rel="index"><span itemprop="name">并查集</span></a></span> </span><span class="post-comments-count"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-comment-o"></i> </span><span class="post-meta-item-text">评论数： </span><a href="/posts/how-tables.html#comments" itemprop="discussionUrl"><span class="post-comments-count valine-comment-count" data-xid="/posts/how-tables.html" itemprop="commentCount"></span> </a></span><span id="/posts/how-tables.html" class="leancloud_visitors" data-flag-title="how many tables-HDU-1213(并查集求连通域数目)"><span class="post-meta-divider">|</span> <span title="阅读次数"><span class="post-meta-item-icon"><i class="fa fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span></span></span><div class="post-symbolscount"><span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-file-word-o"></i> </span><span class="post-meta-item-text">本文字数：</span> <span title="本文字数">157</span> <span class="post-meta-divider">|</span> <span class="post-meta-item-icon"><i class="fa fa-clock-o"></i> </span><span class="post-meta-item-text">阅读时长 ≈</span> <span title="阅读时长">1 分钟</span></div></div></header><div class="post-body" itemprop="articleBody"><p>并查集求连通域数目，初始化sum=n；<br>题目链接： <a href="http://acm.hdu.edu.cn/showproblem.php?pid=1213" rel="external nofollow noopener noreferrer" target="_blank">how many tables</a></p><a id="more"></a><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span><span class="meta-string"><bits/stdc++.h></span></span></span><br><span class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">int</span> pre[<span class="number">1005</span>];</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">find</span><span class="params">(<span class="keyword">int</span> root)</span></span>{</span><br><span class="line"> <span class="keyword">int</span> son,t;</span><br><span class="line"> son=root;</span><br><span class="line"> <span class="keyword">while</span>(root!=pre[root])</span><br><span class="line"> root=pre[root];</span><br><span class="line"> <span class="keyword">while</span>(son!=root){</span><br><span class="line"> t=pre[son];</span><br><span class="line"> pre[son]=root;</span><br><span class="line"> son=t;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> root;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">int</span> n,m,t,sum,root1,root2;</span><br><span class="line"> <span class="built_in">cin</span>>>t;</span><br><span class="line"> <span class="keyword">while</span>(t--){</span><br><span class="line"> <span class="built_in">cin</span>>>n>>m;</span><br><span class="line"> sum=n;</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">1</span>;i<=n;i++)</span><br><span class="line"> pre[i]=i;</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> i=<span class="number">0</span>;i<m;i++){</span><br><span class="line"> <span class="built_in">cin</span>>>root1>>root2;</span><br><span class="line"> <span class="keyword">int</span> xx=find(root1);</span><br><span class="line"> <span class="keyword">int</span> yy=find(root2);</span><br><span class="line"> <span class="keyword">if</span>(xx!=yy){</span><br><span class="line"> pre[xx]=yy;</span><br><span class="line"> sum--;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="built_in">cout</span><<sum<<<span class="built_in">endl</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure></div><div class="popular-posts-header"><i class="fa fa-link"></i> 相关文章</div><!--[if 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