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7.1. &nbsp; 二叉树
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7.2. &nbsp; 二叉树遍历
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7.3. &nbsp; 二叉树数组表示
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7.4. &nbsp; 二叉搜索树
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7.5. &nbsp; AVL 树 *
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8. &nbsp;
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8. &nbsp;
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8.2. &nbsp; 建堆操作
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9. &nbsp;
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9.1. &nbsp;
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9.2. &nbsp; 图基础操作
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<h1 id="12">1.2. &nbsp; 算法是什么<a class="headerlink" href="#12" title="Permanent link">&para;</a></h1>
<h2 id="121">1.2.1. &nbsp; 算法定义<a class="headerlink" href="#121" title="Permanent link">&para;</a></h2>
<p>「算法 Algorithm」是在有限时间内解决特定问题的一组指令或操作步骤。算法具有以下特性</p>
<ul>
<li>问题是明确的,包含清晰的输入和输出定义。</li>
<li>具有可行性,能够在有限步骤、时间和内存空间下完成。</li>
<li>各步骤都有确定的含义,相同的输入和运行条件下,输出始终相同。</li>
</ul>
<h2 id="122">1.2.2. &nbsp; 数据结构定义<a class="headerlink" href="#122" title="Permanent link">&para;</a></h2>
<p>「数据结构 Data Structure」是计算机中组织和存储数据的方式。为了提高数据存储和操作性能数据结构的设计目标包括</p>
<ul>
<li>空间占用尽量减少,节省计算机内存。</li>
<li>数据操作尽可能快速,涵盖数据访问、添加、删除、更新等。</li>
<li>提供简洁的数据表示和逻辑信息,以便使得算法高效运行。</li>
</ul>
<p>数据结构设计是一个充满权衡的过程,这意味着要在某方面取得优势,往往需要在另一方面作出妥协。例如,链表相较于数组,在数据添加和删除操作上更加便捷,但牺牲了数据访问速度;图相较于链表,提供了更丰富的逻辑信息,但需要占用更大的内存空间。</p>
<h2 id="123">1.2.3. &nbsp; 数据结构与算法的关系<a class="headerlink" href="#123" title="Permanent link">&para;</a></h2>
<p>「数据结构」与「算法」高度相关且紧密结合,具体表现在:</p>
<ul>
<li>数据结构是算法的基石。数据结构为算法提供了结构化存储的数据,以及用于操作数据的方法。</li>
<li>算法是数据结构发挥的舞台。数据结构本身仅存储数据信息,通过结合算法才能解决特定问题。</li>
<li>特定算法通常有对应最优的数据结构。算法通常可以基于不同的数据结构进行实现,但最终执行效率可能相差很大。</li>
</ul>
<p><img alt="数据结构与算法的关系" src="../what_is_dsa.assets/relationship_between_data_structure_and_algorithm.png" /></p>
<p align="center"> Fig. 数据结构与算法的关系 </p>
<p>我们可以把数据结构与算法类比为拼装积木。一套积木,除了包含许多零件之外,还附有详细的组装说明书。我们按照说明书一步步操作,就能组装出精美的积木模型。</p>
<p><img alt="拼装积木" src="../what_is_dsa.assets/assembling_blocks.jpg" /></p>
<p align="center"> Fig. 拼装积木 </p>
<p>两者的详细对应关系如下表所示。</p>
<div class="center-table">
<table>
<thead>
<tr>
<th>数据结构与算法</th>
<th>LEGO 乐高</th>
</tr>
</thead>
<tbody>
<tr>
<td>输入数据</td>
<td>未拼装的积木</td>
</tr>
<tr>
<td>数据结构</td>
<td>积木组织形式,包括形状、大小、连接方式等</td>
</tr>
<tr>
<td>算法</td>
<td>把积木拼成目标形态的一系列操作步骤</td>
</tr>
<tr>
<td>输出数据</td>
<td>积木模型</td>
</tr>
</tbody>
</table>
</div>
<p>值得注意的是,数据结构与算法独立于编程语言。正因如此,本书得以提供多种编程语言的实现。</p>
<div class="admonition tip">
<p class="admonition-title">约定俗成的简称</p>
<p>在实际讨论时,我们通常会将「数据结构与算法」简称为「算法」。例如,众所周知的 LeetCode 算法题目,实际上同时考察了数据结构和算法两方面的知识。</p>
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