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1.2.1. &nbsp; 算法定义
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1.2.2. &nbsp; 数据结构定义
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<a href="https://github.com/krahets/hello-algo/tree/main/docs/chapter_introduction/what_is_dsa.md" title="编辑此页" class="md-content__button md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4v-2m10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1 2.1 2.1Z"/></svg>
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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,需要拥有明确的输入和输出定义。</li>
<li>解具有确定性,即给定相同输入时,输出一定相同。</li>
<li>具有可行性,可在有限步骤、有限时间、有限内存空间下完成。</li>
<li>独立于编程语言,即可用多种语言实现。</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」是在计算机中组织与存储数据的方式。为了提高数据存储和操作性能数据结构的设计原则有</p>
<ul>
<li>空间占用尽可能小,节省计算机内存。</li>
<li>数据操作尽量快,包括数据访问、添加、删除、更新等。</li>
<li>提供简洁的数据表示和逻辑信息,以便算法高效运行。</li>
</ul>
<p>数据结构的设计是一个充满权衡的过程,这意味着如果获得某方面的优势,则往往需要在另一方面做出妥协。例如,链表相对于数组,数据添加删除操作更加方便,但牺牲了数据的访问速度;图相对于链表,提供了更多的逻辑信息,但需要占用更多的内存空间。</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」是高度相关、紧密嵌合的,体现在:</p>
<ul>
<li>数据结构是算法的底座。数据结构为算法提供结构化存储的数据,以及操作数据的对应方法。</li>
<li>算法是发挥数据结构优势的舞台。数据结构仅存储数据信息,结合算法才可解决特定问题。</li>
<li>算法有对应最优的数据结构。给定算法,一般可基于不同的数据结构实现,而最终执行效率往往相差很大。</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>如果将「LEGO 乐高」类比到「数据结构与算法」,那么可以得到下表所示的对应关系。</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>
<div class="admonition tip">
<p class="admonition-title">约定俗成的简称</p>
<p>在实际讨论中,我们通常会将「数据结构与算法」直接简称为「算法」。例如,我们熟称的 LeetCode 算法题目,实际上同时考察了数据结构和算法两部分知识。</p>
</div>
<h2 id="__comments">评论</h2>
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