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<h1 id="162">16.2 &nbsp; 一起参与创作<a class="headerlink" href="#162" title="Permanent link">&para;</a></h1>
<p>由于笔者能力有限,书中难免存在一些遗漏和错误,请您谅解。如果您发现了笔误、链接失效、内容缺失、文字歧义、解释不清晰或行文结构不合理等问题,请协助我们进行修正,以给读者提供更优质的学习资源。</p>

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<h1 id="16">第 16 章 &nbsp; 附录<a class="headerlink" href="#16" title="Permanent link">&para;</a></h1>
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<h1 id="161">16.1 &nbsp; 编程环境安装<a class="headerlink" href="#161" title="Permanent link">&para;</a></h1>
<h2 id="1611-ide">16.1.1 &nbsp; 安装 IDE<a class="headerlink" href="#1611-ide" title="Permanent link">&para;</a></h2>

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<h1 id="163">16.3 &nbsp; 术语表<a class="headerlink" href="#163" title="Permanent link">&para;</a></h1>
<p>表 16-1 列出了书中出现的重要术语。建议你同时记住它们的中英文叫法,以便阅读英文文献。</p>

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<h1 id="41">4.1 &nbsp; 数组<a class="headerlink" href="#41" title="Permanent link">&para;</a></h1>
<p>「数组 array」是一种线性数据结构其将相同类型的元素存储在连续的内存空间中。我们将元素在数组中的位置称为该元素的「索引 index」。图 4-1 展示了数组的主要术语和概念。</p>

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<h1 id="4">第 4 章 &nbsp; 数组与链表<a class="headerlink" href="#4" title="Permanent link">&para;</a></h1>
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<h1 id="42">4.2 &nbsp; 链表<a class="headerlink" href="#42" title="Permanent link">&para;</a></h1>
<p>内存空间是所有程序的公共资源,在一个复杂的系统运行环境下,空闲的内存空间可能散落在内存各处。我们知道,存储数组的内存空间必须是连续的,而当数组非常大时,内存可能无法提供如此大的连续空间。此时链表的灵活性优势就体现出来了。</p>

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<p>「列表 list」是一个抽象的数据结构概念它表示元素的有序集合支持元素访问、修改、添加、删除和遍历等操作无须使用者考虑容量限制的问题。列表可以基于链表或数组实现。</p>

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<p>在本章的前两节中,我们探讨了数组和链表这两种基础且重要的数据结构,它们分别代表了“连续存储”和“分散存储”这两种不同的物理结构。</p>

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<h1 id="45">4.5 &nbsp; 小结<a class="headerlink" href="#45" title="Permanent link">&para;</a></h1>
<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<h1 id="131">13.1 &nbsp; 回溯算法<a class="headerlink" href="#131" title="Permanent link">&para;</a></h1>
<p>「回溯算法 backtracking algorithm」是一种通过穷举来解决问题的方法它的核心思想是从一个初始状态出发暴力搜索所有可能的解决方案当遇到正确的解则将其记录直到找到解或者尝试了所有可能的选择都无法找到解为止。</p>

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<h1 id="13">第 13 章 &nbsp; 回溯<a class="headerlink" href="#13" title="Permanent link">&para;</a></h1>
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<h1 id="132">13.2 &nbsp; 全排列问题<a class="headerlink" href="#132" title="Permanent link">&para;</a></h1>
<p>全排列问题是回溯算法的一个典型应用。它的定义是在给定一个集合(如一个数组或字符串)的情况下,找出其中元素的所有可能的排列。</p>

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<h2 id="1331">13.3.1 &nbsp; 无重复元素的情况<a class="headerlink" href="#1331" title="Permanent link">&para;</a></h2>

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<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<p>在算法中,重复执行某个任务是很常见的,其与复杂度分析息息相关。因此,在展开介绍时间复杂度和空间复杂度之前,我们先来了解如何在程序中实现重复执行任务,即两种基本的程序控制结构:迭代、递归。</p>

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<h1 id="21">2.1 &nbsp; 算法效率评估<a class="headerlink" href="#21" title="Permanent link">&para;</a></h1>
<p>在算法设计中,我们先后追求以下两个层面的目标。</p>

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<p>「空间复杂度 space complexity」用于衡量算法占用内存空间随着数据量变大时的增长趋势。这个概念与时间复杂度非常类似只需将“运行时间”替换为“占用内存空间”。</p>

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<h1 id="25">2.5 &nbsp; 小结<a class="headerlink" href="#25" title="Permanent link">&para;</a></h1>
<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<p>运行时间可以直观且准确地反映算法的效率。如果我们想准确预估一段代码的运行时间,应该如何操作呢?</p>

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<p>当谈及计算机中的数据时我们会想到文本、图片、视频、语音、3D 模型等各种形式。尽管这些数据的组织形式各异,但它们都由各种基本数据类型构成。</p>

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<p>在计算机中,所有数据都是以二进制数的形式存储的,字符 <code>char</code> 也不例外。为了表示字符,我们需要建立一套“字符集”,规定每个字符和二进制数之间的一一对应关系。有了字符集之后,计算机就可以通过查表完成二进制数到字符的转换。</p>

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<p>常见的数据结构包括数组、链表、栈、队列、哈希表、树、堆、图,它们可以从“逻辑结构”和“物理结构”两个维度进行分类。</p>

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<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<h1 id="122">12.2 &nbsp; 分治搜索策略<a class="headerlink" href="#122" title="Permanent link">&para;</a></h1>
<p>我们已经学过,搜索算法分为两大类。</p>

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<h1 id="121">12.1 &nbsp; 分治算法<a class="headerlink" href="#121" title="Permanent link">&para;</a></h1>
<p>「分治 divide and conquer」全称分而治之是一种非常重要且常见的算法策略。分治通常基于递归实现包括“分”和“治”两个步骤。</p>

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<h1 id="124">12.4 &nbsp; 汉诺塔问题<a class="headerlink" href="#124" title="Permanent link">&para;</a></h1>
<p>在归并排序和构建二叉树中,我们都是将原问题分解为两个规模为原问题一半的子问题。然而对于汉诺塔问题,我们采用不同的分解策略。</p>

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<h1 id="142">14.2 &nbsp; 动态规划问题特性<a class="headerlink" href="#142" title="Permanent link">&para;</a></h1>
<p>在上一节中,我们学习了动态规划是如何通过子问题分解来求解原问题的。实际上,子问题分解是一种通用的算法思路,在分治、动态规划、回溯中的侧重点不同。</p>

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<h1 id="143">14.3 &nbsp; 动态规划解题思路<a class="headerlink" href="#143" title="Permanent link">&para;</a></h1>
<p>上两节介绍了动态规划问题的主要特征,接下来我们一起探究两个更加实用的问题。</p>

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<h1 id="146">14.6 &nbsp; 编辑距离问题<a class="headerlink" href="#146" title="Permanent link">&para;</a></h1>
<p>编辑距离,也称 Levenshtein 距离,指两个字符串之间互相转换的最少修改次数,通常用于在信息检索和自然语言处理中度量两个序列的相似度。</p>

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<h1 id="14">第 14 章 &nbsp; 动态规划<a class="headerlink" href="#14" title="Permanent link">&para;</a></h1>
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<h1 id="141">14.1 &nbsp; 初探动态规划<a class="headerlink" href="#141" title="Permanent link">&para;</a></h1>
<p>「动态规划 dynamic programming」是一个重要的算法范式它将一个问题分解为一系列更小的子问题并通过存储子问题的解来避免重复计算从而大幅提升时间效率。</p>

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<h1 id="144-0-1">14.4 &nbsp; 0-1 背包问题<a class="headerlink" href="#144-0-1" title="Permanent link">&para;</a></h1>
<p>背包问题是一个非常好的动态规划入门题目,是动态规划中最常见的问题形式。其具有很多变种,例如 0-1 背包问题、完全背包问题、多重背包问题等。</p>

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<h1 id="147">14.7 &nbsp; 小结<a class="headerlink" href="#147" title="Permanent link">&para;</a></h1>
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<h1 id="145">14.5 &nbsp; 完全背包问题<a class="headerlink" href="#145" title="Permanent link">&para;</a></h1>
<p>在本节中,我们先求解另一个常见的背包问题:完全背包,再了解它的一种特例:零钱兑换。</p>

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<h1 id="91">9.1 &nbsp;<a class="headerlink" href="#91" title="Permanent link">&para;</a></h1>
<p>「图 graph」是一种非线性数据结构由「顶点 vertex」和「边 edge」组成。我们可以将图 <span class="arithmatex">\(G\)</span> 抽象地表示为一组顶点 <span class="arithmatex">\(V\)</span> 和一组边 <span class="arithmatex">\(E\)</span> 的集合。以下示例展示了一个包含 5 个顶点和 7 条边的图。</p>

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<p>图的基础操作可分为对“边”的操作和对“顶点”的操作。在“邻接矩阵”和“邻接表”两种表示方法下,实现方式有所不同。</p>

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<h1 id="93">9.3 &nbsp; 图的遍历<a class="headerlink" href="#93" title="Permanent link">&para;</a></h1>
<p>树代表的是“一对多”的关系,而图则具有更高的自由度,可以表示任意的“多对多”关系。因此,我们可以把树看作图的一种特例。显然,<strong>树的遍历操作也是图的遍历操作的一种特例</strong></p>

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<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<h1 id="151">15.1 &nbsp; 贪心算法<a class="headerlink" href="#151" title="Permanent link">&para;</a></h1>
<p>「贪心算法 greedy algorithm」是一种常见的解决优化问题的算法其基本思想是在问题的每个决策阶段都选择当前看起来最优的选择即贪心地做出局部最优的决策以期获得全局最优解。贪心算法简洁且高效在许多实际问题中有着广泛的应用。</p>

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<p>前两节介绍了哈希表的工作原理和哈希冲突的处理方法。然而无论是开放寻址还是链式地址,<strong>它们只能保证哈希表可以在发生冲突时正常工作,而无法减少哈希冲突的发生</strong></p>

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<h1 id="62">6.2 &nbsp; 哈希冲突<a class="headerlink" href="#62" title="Permanent link">&para;</a></h1>
<p>上一节提到,<strong>通常情况下哈希函数的输入空间远大于输出空间</strong>,因此理论上哈希冲突是不可避免的。比如,输入空间为全体整数,输出空间为数组容量大小,则必然有多个整数映射至同一桶索引。</p>

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<p>「哈希表 hash table」又称「散列表」其通过建立键 <code>key</code> 与值 <code>value</code> 之间的映射,实现高效的元素查询。具体而言,我们向哈希表输入一个键 <code>key</code> ,则可以在 <span class="arithmatex">\(O(1)\)</span> 时间内获取对应的值 <code>value</code></p>

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<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<p>在某些情况下,我们希望使用一个列表的所有元素来构建一个堆,这个过程被称为“建堆操作”。</p>

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<p>「堆 heap」是一种满足特定条件的完全二叉树主要可分为两种类型如图 8-1 所示。</p>

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<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<p>当我们听到“算法”这个词时,很自然地会想到数学。然而实际上,许多算法并不涉及复杂数学,而是更多地依赖基本逻辑,这些逻辑在我们的日常生活中处处可见。</p>

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<h2 id="121">1.2.1 &nbsp; 算法定义<a class="headerlink" href="#121" title="Permanent link">&para;</a></h2>

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<p>本项目旨在创建一本开源、免费、新手友好的数据结构与算法入门教程。</p>

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<p>[1] Thomas H. Cormen, et al. Introduction to Algorithms (3<sup>rd</sup> Edition).</p>

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<h1 id="101">10.1 &nbsp; 二分查找<a class="headerlink" href="#101" title="Permanent link">&para;</a></h1>
<p>「二分查找 binary search」是一种基于分治策略的高效搜索算法。它利用数据的有序性每轮缩小一半搜索范围直至找到目标元素或搜索区间为空为止。</p>

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<h2 id="1031">10.3.1 &nbsp; 查找左边界<a class="headerlink" href="#1031" title="Permanent link">&para;</a></h2>

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<p>二分查找不仅可用于搜索目标元素,还可用于解决许多变种问题,比如搜索目标元素的插入位置。</p>

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<h1 id="10">第 10 章 &nbsp; 搜索<a class="headerlink" href="#10" title="Permanent link">&para;</a></h1>
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<h1 id="104">10.4 &nbsp; 哈希优化策略<a class="headerlink" href="#104" title="Permanent link">&para;</a></h1>
<p>在算法题中,<strong>我们常通过将线性查找替换为哈希查找来降低算法的时间复杂度</strong>。我们借助一个算法题来加深理解。</p>

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<h1 id="105">10.5 &nbsp; 重识搜索算法<a class="headerlink" href="#105" title="Permanent link">&para;</a></h1>
<p>「搜索算法 searching algorithm」用于在数据结构例如数组、链表、树或图中搜索一个或一组满足特定条件的元素。</p>

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<p>「冒泡排序 bubble sort」通过连续地比较与交换相邻元素实现排序。这个过程就像气泡从底部升到顶部一样因此得名冒泡排序。</p>

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<h1 id="118">11.8 &nbsp; 桶排序<a class="headerlink" href="#118" title="Permanent link">&para;</a></h1>
<p>前述几种排序算法都属于“基于比较的排序算法”,它们通过比较元素间的大小来实现排序。此类排序算法的时间复杂度无法超越 <span class="arithmatex">\(O(n \log n)\)</span> 。接下来,我们将探讨几种“非比较排序算法”,它们的时间复杂度可以达到线性阶。</p>

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<h1 id="119">11.9 &nbsp; 计数排序<a class="headerlink" href="#119" title="Permanent link">&para;</a></h1>
<p>「计数排序 counting sort」通过统计元素数量来实现排序通常应用于整数数组。</p>

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<h1 id="11">第 11 章 &nbsp; 排序<a class="headerlink" href="#11" title="Permanent link">&para;</a></h1>
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<h1 id="114">11.4 &nbsp; 插入排序<a class="headerlink" href="#114" title="Permanent link">&para;</a></h1>
<p>「插入排序 insertion sort」是一种简单的排序算法它的工作原理与手动整理一副牌的过程非常相似。</p>

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<h1 id="116">11.6 &nbsp; 归并排序<a class="headerlink" href="#116" title="Permanent link">&para;</a></h1>
<p>「归并排序 merge sort」是一种基于分治策略的排序算法包含图 11-10 所示的“划分”和“合并”阶段。</p>

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<p>「快速排序 quick sort」是一种基于分治策略的排序算法运行高效应用广泛。</p>

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<h1 id="1110">11.10 &nbsp; 基数排序<a class="headerlink" href="#1110" title="Permanent link">&para;</a></h1>
<p>上一节介绍了计数排序,它适用于数据量 <span class="arithmatex">\(n\)</span> 较大但数据范围 <span class="arithmatex">\(m\)</span> 较小的情况。假设我们需要对 <span class="arithmatex">\(n = 10^6\)</span> 个学号进行排序,而学号是一个 <span class="arithmatex">\(8\)</span> 位数字,这意味着数据范围 <span class="arithmatex">\(m = 10^8\)</span> 非常大,使用计数排序需要分配大量内存空间,而基数排序可以避免这种情况。</p>

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<h1 id="112">11.2 &nbsp; 选择排序<a class="headerlink" href="#112" title="Permanent link">&para;</a></h1>
<p>「选择排序 selection sort」的工作原理非常简单开启一个循环每轮从未排序区间选择最小的元素将其放到已排序区间的末尾。</p>

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<h1 id="111">11.1 &nbsp; 排序算法<a class="headerlink" href="#111" title="Permanent link">&para;</a></h1>
<p>「排序算法 sorting algorithm」用于对一组数据按照特定顺序进行排列。排序算法有着广泛的应用因为有序数据通常能够被更高效地查找、分析和处理。</p>

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<h1 id="1111">11.11 &nbsp; 小结<a class="headerlink" href="#1111" title="Permanent link">&para;</a></h1>
<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<p>在队列中,我们仅能删除头部元素或在尾部添加元素。如图 5-7 所示,「双向队列 double-ended queue」提供了更高的灵活性允许在头部和尾部执行元素的添加或删除操作。</p>

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<h1 id="5">第 5 章 &nbsp; 栈与队列<a class="headerlink" href="#5" title="Permanent link">&para;</a></h1>
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<p>「队列 queue」是一种遵循先入先出规则的线性数据结构。顾名思义队列模拟了排队现象即新来的人不断加入队列尾部而位于队列头部的人逐个离开。</p>

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<p>「栈 stack」是一种遵循先入后出的逻辑的线性数据结构。</p>

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<h3 id="1">1. &nbsp; 重点回顾<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>

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<h1 id="73">7.3 &nbsp; 二叉树数组表示<a class="headerlink" href="#73" title="Permanent link">&para;</a></h1>
<p>在链表表示下,二叉树的存储单元为节点 <code>TreeNode</code> ,节点之间通过指针相连接。上一节介绍了链表表示下的二叉树的各项基本操作。</p>

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<p>在“二叉搜索树”章节中,我们提到,在多次插入和删除操作后,二叉搜索树可能退化为链表。在这种情况下,所有操作的时间复杂度将从 <span class="arithmatex">\(O(\log n)\)</span> 恶化为 <span class="arithmatex">\(O(n)\)</span></p>

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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M441 58.9 453.1 71c9.4 9.4 9.4 24.6 0 33.9L424 134.1 377.9 88 407 58.9c9.4-9.4 24.6-9.4 33.9 0zM209.8 256.2 344 121.9l46.1 46.1-134.3 134.2c-2.9 2.9-6.5 5-10.4 6.1L186.9 325l16.7-58.5c1.1-3.9 3.2-7.5 6.1-10.4zM373.1 25 175.8 222.2c-8.7 8.7-15 19.4-18.3 31.1l-28.6 100c-2.4 8.4-.1 17.4 6.1 23.6s15.2 8.5 23.6 6.1l100-28.6c11.8-3.4 22.5-9.7 31.1-18.3L487 138.9c28.1-28.1 28.1-73.7 0-101.8L474.9 25c-28.1-28.1-73.7-28.1-101.8 0zM88 64c-48.6 0-88 39.4-88 88v272c0 48.6 39.4 88 88 88h272c48.6 0 88-39.4 88-88V312c0-13.3-10.7-24-24-24s-24 10.7-24 24v112c0 22.1-17.9 40-40 40H88c-22.1 0-40-17.9-40-40V152c0-22.1 17.9-40 40-40h112c13.3 0 24-10.7 24-24s-10.7-24-24-24H88z"/></svg>
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<h1 id="74">7.4 &nbsp; 二叉搜索树<a class="headerlink" href="#74" title="Permanent link">&para;</a></h1>
<p>如图 7-16 所示,「二叉搜索树 binary search tree」满足以下条件。</p>

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<h1 id="71">7.1 &nbsp; 二叉树<a class="headerlink" href="#71" title="Permanent link">&para;</a></h1>
<p>「二叉树 binary tree」是一种非线性数据结构代表“祖先”与“后代”之间的派生关系体现了“一分为二”的分治逻辑。与链表类似二叉树的基本单元是节点每个节点包含值、左子节点引用和右子节点引用。</p>

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