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<p><img alt="链表定义与存储方式" src="../linked_list.assets/linkedlist_definition.png" /></p>
<p align="center"> Fig. 链表定义与存储方式 </p>
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<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="cm">/* 链表节点类 */</span>
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<p>在编程语言中,数组整体就是一个变量,例如数组 <code>nums</code> ,包含各个元素 <code>nums[0]</code> , <code>nums[1]</code> 等等。而链表是由多个节点对象组成,我们通常将头节点当作链表的代称,例如头节点 <code>head</code> 和链表 <code>head</code> 实际上是同义的。</p>
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<p><strong>链表初始化方法</strong>。建立链表分为两步,第一步是初始化各个节点对象,第二步是构建引用指向关系。完成后,即可以从链表的头节点(即首个节点)出发,通过指针 <code>next</code> 依次访问所有节点。</p>
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<div class="highlight"><span class="filename">linked_list.java</span><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="cm">/* 初始化链表 1 -&gt; 3 -&gt; 2 -&gt; 5 -&gt; 4 */</span>
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<p><img alt="链表插入节点" src="../linked_list.assets/linkedlist_insert_node.png" /></p>
<p align="center"> Fig. 链表插入节点 </p>
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<div class="highlight"><span class="filename">linked_list.java</span><pre><span></span><code><a id="__codelineno-24-1" name="__codelineno-24-1" href="#__codelineno-24-1"></a><span class="cm">/* 在链表的节点 n0 之后插入节点 P */</span>
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<p><img alt="链表删除节点" src="../linked_list.assets/linkedlist_remove_node.png" /></p>
<p align="center"> Fig. 链表删除节点 </p>
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<div class="highlight"><span class="filename">linked_list.java</span><pre><span></span><code><a id="__codelineno-36-1" name="__codelineno-36-1" href="#__codelineno-36-1"></a><span class="cm">/* 删除链表的节点 n0 之后的首个节点 */</span>
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<h2 id="422">4.2.2. &nbsp; 链表缺点<a class="headerlink" href="#422" title="Permanent link">&para;</a></h2>
<p><strong>链表访问节点效率较低</strong>。如上节所述,数组可以在 <span class="arithmatex">\(O(1)\)</span> 时间下访问任意元素。然而,链表无法直接访问任意节点,这是因为系统需要从头节点出发,逐个向后遍历直至找到目标节点。例如,若要访问链表索引为 <code>index</code>(即第 <code>index + 1</code> 个)的节点,则需要向后遍历 <code>index</code> 轮。</p>
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<div class="highlight"><span class="filename">linked_list.java</span><pre><span></span><code><a id="__codelineno-48-1" name="__codelineno-48-1" href="#__codelineno-48-1"></a><span class="cm">/* 访问链表中索引为 index 的节点 */</span>
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<p><strong>链表的内存占用较大</strong>。链表以节点为单位,每个节点除了保存值之外,还需额外保存指针(引用)。这意味着在相同数据量的情况下,链表比数组需要占用更多的内存空间。</p>
<h2 id="423">4.2.3. &nbsp; 链表常用操作<a class="headerlink" href="#423" title="Permanent link">&para;</a></h2>
<p><strong>遍历链表查找</strong>。遍历链表,查找链表内值为 <code>target</code> 的节点,输出节点在链表中的索引。</p>
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<div class="highlight"><span class="filename">linked_list.java</span><pre><span></span><code><a id="__codelineno-60-1" name="__codelineno-60-1" href="#__codelineno-60-1"></a><span class="cm">/* 在链表中查找值为 target 的首个节点 */</span>
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<p><strong>单向链表</strong>。即上述介绍的普通链表。单向链表的节点包含值和指向下一节点的指针(引用)两项数据。我们将首个节点称为头节点,将最后一个节点成为尾节点,尾节点指向空 <span class="arithmatex">\(\text{None}\)</span></p>
<p><strong>环形链表</strong>。如果我们令单向链表的尾节点指向头节点(即首尾相接),则得到一个环形链表。在环形链表中,任意节点都可以视作头节点。</p>
<p><strong>双向链表</strong>。与单向链表相比,双向链表记录了两个方向的指针(引用)。双向链表的节点定义同时包含指向后继节点(下一节点)和前驱节点(上一节点)的指针。相较于单向链表,双向链表更具灵活性,可以朝两个方向遍历链表,但相应地也需要占用更多的内存空间。</p>
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<div class="highlight"><pre><span></span><code><a id="__codelineno-72-1" name="__codelineno-72-1" href="#__codelineno-72-1"></a><span class="cm">/* 双向链表节点类 */</span>