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删除链表中重复的结点
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<time title="创建时间：2020-06-06 11:40:55 / 修改时间：19:07:24" itemprop="dateCreated datePublished" datetime="2020-06-06T11:40:55+08:00">2020-06-06</time>
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<div class="post-description">删除链表中重复的结点，返回新的链表。</div>
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<h1 id="题目描述"><a href="#题目描述" class="headerlink" title="题目描述"></a>题目描述</h1><p>在一个排序的链表中，存在重复的结点，请删除该链表中重复的结点，重复的结点不保留，返回链表头指针。 例如，链表1->2->3->3->4->4->5 处理后为 1->2->5</p>
<h1 id="解题思路"><a href="#解题思路" class="headerlink" title="解题思路"></a>解题思路</h1><p>处理链表重复问题，一般使用三个指针：<code>pPre\pCur\pNext</code>分别指向当前结点的前一个结点，当前结点，当前结点的后一个结点。</p>
<p>具体思想请看代码部分。</p>
<h1 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h1><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><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">ListNode</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"> <span class="keyword">int</span> val;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">ListNode</span> *<span class="title">next</span>;</span></span><br><span class="line"> ListNode (<span class="keyword">int</span> x): val(x), next(<span class="literal">NULL</span>) {}</span><br><span class="line">};</span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span></span></span><br><span class="line"><span class="class">{</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line"> <span class="function">ListNode* <span class="title">deleteDuplication</span> <span class="params">(ListNode* pHead)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">if</span> (pHead == <span class="literal">NULL</span>)</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">NULL</span>;</span><br><span class="line"> </span><br><span class="line"> ListNode* pPre = <span class="literal">NULL</span>;</span><br><span class="line"> ListNode* pCur = pHead;</span><br><span class="line"> ListNode* pNext = <span class="literal">NULL</span>;</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">while</span> (pCur != <span class="literal">NULL</span>)</span><br><span class="line"> {</span><br><span class="line"> <span class="keyword">if</span> (pCur->next != <span class="literal">NULL</span> && pCur->val == pCur->next->val)</span><br><span class="line"> {</span><br><span class="line"> pNext = pCur->next;</span><br><span class="line"> <span class="comment">// 跳出循环的pNext就是重复的最后一个结点</span></span><br><span class="line"> <span class="keyword">while</span> (pNext->next != <span class="literal">NULL</span> && pCur->val == pNext->next->val)</span><br><span class="line"> {</span><br><span class="line"> pNext = pNext->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> (pCur == pHead)</span><br><span class="line"> {</span><br><span class="line"> pHead = pNext->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> pPre->next = pNext->next;</span><br><span class="line"> pCur = pNext->next;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> pPre = pCur;</span><br><span class="line"> pCur = pCur->next;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> pHead;</span><br><span class="line"> }</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<p>参考链接：<a href="https://cuijiahua.com/blog/2018/01/basis_56.html" target="_blank" rel="noopener">https://cuijiahua.com/blog/2018/01/basis_56.html</a></p>
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<p><span>文章作者:</span><a href="/" title="访问 zerofly 的个人博客">zerofly</a></p>
<p><span>发布时间:</span>2020年06月06日 - 11:06</p>
<p><span>原始链接:</span><a href="/348f314f.html" title="删除链表中重复的结点">http://zeroflycui.github.io/348f314f.html</a>
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