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<p>「链表 Linked List」是一种线性数据结构其中每个元素都是单独的对象各个元素一般称为结点之间通过指针连接。由于结点中记录了连接关系因此链表的存储方式相比于数组更加灵活系统不必保证内存地址的连续性。</p>
<p>链表的「结点 Node」包含两项数据一是结点「值 Value」二是指向下一结点的「指针 Pointer」或称「引用 Reference」</p>
<p><img alt="linkedlist_definition" src="../linked_list.assets/linkedlist_definition.png" /></p>
<p align="center"> Fig. 链表定义与存储方式 </p>
<p><img alt="链表定义与存储方式" src="../linked_list.assets/linkedlist_definition.png" /></p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:10"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><input id="__tabbed_1_3" name="__tabbed_1" type="radio" /><input id="__tabbed_1_4" name="__tabbed_1" type="radio" /><input id="__tabbed_1_5" name="__tabbed_1" type="radio" /><input id="__tabbed_1_6" name="__tabbed_1" type="radio" /><input id="__tabbed_1_7" name="__tabbed_1" type="radio" /><input id="__tabbed_1_8" name="__tabbed_1" type="radio" /><input id="__tabbed_1_9" name="__tabbed_1" type="radio" /><input id="__tabbed_1_10" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Java</label><label for="__tabbed_1_2">C++</label><label for="__tabbed_1_3">Python</label><label for="__tabbed_1_4">Go</label><label for="__tabbed_1_5">JavaScript</label><label for="__tabbed_1_6">TypeScript</label><label for="__tabbed_1_7">C</label><label for="__tabbed_1_8">C#</label><label for="__tabbed_1_9">Swift</label><label for="__tabbed_1_10">Zig</label></div>
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<h2 id="421">4.2.1. &nbsp; 链表优点<a class="headerlink" href="#421" title="Permanent link">&para;</a></h2>
<p><strong>在链表中,插入与删除结点的操作效率高</strong>。比如,如果我们想在链表中间的两个结点 <code>A</code> , <code>B</code> 之间插入一个新结点 <code>P</code> ,我们只需要改变两个结点指针即可,时间复杂度为 <span class="arithmatex">\(O(1)\)</span> ,相比数组的插入操作高效很多。</p>
<p><img alt="linkedlist_insert_node" src="../linked_list.assets/linkedlist_insert_node.png" /></p>
<p><img alt="链表插入结点" src="../linked_list.assets/linkedlist_insert_node.png" /></p>
<div class="tabbed-set tabbed-alternate" data-tabs="3:10"><input checked="checked" id="__tabbed_3_1" name="__tabbed_3" type="radio" /><input id="__tabbed_3_2" name="__tabbed_3" type="radio" /><input id="__tabbed_3_3" name="__tabbed_3" type="radio" /><input id="__tabbed_3_4" name="__tabbed_3" type="radio" /><input id="__tabbed_3_5" name="__tabbed_3" type="radio" /><input id="__tabbed_3_6" name="__tabbed_3" type="radio" /><input id="__tabbed_3_7" name="__tabbed_3" type="radio" /><input id="__tabbed_3_8" name="__tabbed_3" type="radio" /><input id="__tabbed_3_9" name="__tabbed_3" type="radio" /><input id="__tabbed_3_10" name="__tabbed_3" type="radio" /><div class="tabbed-labels"><label for="__tabbed_3_1">Java</label><label for="__tabbed_3_2">C++</label><label for="__tabbed_3_3">Python</label><label for="__tabbed_3_4">Go</label><label for="__tabbed_3_5">JavaScript</label><label for="__tabbed_3_6">TypeScript</label><label for="__tabbed_3_7">C</label><label for="__tabbed_3_8">C#</label><label for="__tabbed_3_9">Swift</label><label for="__tabbed_3_10">Zig</label></div>
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<p>在链表中删除结点也很方便,只需要改变一个结点指针即可。如下图所示,虽然在完成删除后结点 <code>P</code> 仍然指向 <code>n2</code> ,但实际上 <code>P</code> 已经不属于此链表了,因为遍历此链表是无法访问到 <code>P</code> 的。</p>
<p><img alt="linkedlist_remove_node" src="../linked_list.assets/linkedlist_remove_node.png" /></p>
<p><img alt="链表删除结点" src="../linked_list.assets/linkedlist_remove_node.png" /></p>
<div class="tabbed-set tabbed-alternate" data-tabs="4:10"><input checked="checked" id="__tabbed_4_1" name="__tabbed_4" type="radio" /><input id="__tabbed_4_2" name="__tabbed_4" type="radio" /><input id="__tabbed_4_3" name="__tabbed_4" type="radio" /><input id="__tabbed_4_4" name="__tabbed_4" type="radio" /><input id="__tabbed_4_5" name="__tabbed_4" type="radio" /><input id="__tabbed_4_6" name="__tabbed_4" type="radio" /><input id="__tabbed_4_7" name="__tabbed_4" type="radio" /><input id="__tabbed_4_8" name="__tabbed_4" type="radio" /><input id="__tabbed_4_9" name="__tabbed_4" type="radio" /><input id="__tabbed_4_10" name="__tabbed_4" type="radio" /><div class="tabbed-labels"><label for="__tabbed_4_1">Java</label><label for="__tabbed_4_2">C++</label><label for="__tabbed_4_3">Python</label><label for="__tabbed_4_4">Go</label><label for="__tabbed_4_5">JavaScript</label><label for="__tabbed_4_6">TypeScript</label><label for="__tabbed_4_7">C</label><label for="__tabbed_4_8">C#</label><label for="__tabbed_4_9">Swift</label><label for="__tabbed_4_10">Zig</label></div>
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<p><img alt="linkedlist_common_types" src="../linked_list.assets/linkedlist_common_types.png" /></p>
<p><img alt="常见链表种类" src="../linked_list.assets/linkedlist_common_types.png" /></p>
<p align="center"> Fig. 常见链表类型 </p>