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<title>6.1. 哈希表(Hash Map) - Hello 算法</title>
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<title>6.1. 哈希表 - Hello 算法</title>
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<div data-md-component="skip">
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<a href="#61-hash-map" class="md-skip">
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<a href="#61" class="md-skip">
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跳转至
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</a>
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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6.1. 哈希表(Hash Map)
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6.1. 哈希表
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</div>
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<li class="md-nav__item">
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<a href="../../chapter_array_and_linkedlist/array/" class="md-nav__link">
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4.1. 数组(Array)
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4.1. 数组
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</a>
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<li class="md-nav__item">
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<a href="../../chapter_array_and_linkedlist/linked_list/" class="md-nav__link">
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4.2. 链表(Linked List)
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4.2. 链表
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</a>
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<li class="md-nav__item">
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<a href="../../chapter_array_and_linkedlist/list/" class="md-nav__link">
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4.3. 列表(List)
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4.3. 列表
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<a href="../../chapter_stack_and_queue/stack/" class="md-nav__link">
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5.1. 栈(Stack)
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5.1. 栈
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<li class="md-nav__item">
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<a href="../../chapter_stack_and_queue/queue/" class="md-nav__link">
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5.2. 队列(Queue)
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5.2. 队列
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../chapter_stack_and_queue/deque/" class="md-nav__link">
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5.3. 双向队列(Deque)
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5.3. 双向队列
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</a>
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</li>
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<label class="md-nav__link md-nav__link--active" for="__toc">
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6.1. 哈希表(Hash Map)
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6.1. 哈希表
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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6.1. 哈希表(Hash Map)
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6.1. 哈希表
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</a>
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<label class="md-nav__link" for="__nav_8" id="__nav_8_label" tabindex="0">
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7. 二叉树
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7. 树
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_8_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_8">
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<span class="md-nav__icon md-icon"></span>
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7. 二叉树
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7. 树
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../chapter_tree/binary_tree/" class="md-nav__link">
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7.1. 二叉树(Binary Tree)
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7.1. 二叉树
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../chapter_heap/heap/" class="md-nav__link">
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8.1. 堆(Heap)
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8.1. 堆
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../chapter_graph/graph/" class="md-nav__link">
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9.1. 图(Graph)
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9.1. 图
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</a>
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</li>
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<h1 id="61-hash-map">6.1. 哈希表(Hash Map)<a class="headerlink" href="#61-hash-map" title="Permanent link">¶</a></h1>
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<h1 id="61">6.1. 哈希表<a class="headerlink" href="#61" title="Permanent link">¶</a></h1>
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<p>哈希表通过建立「键 key」和「值 value」之间的映射,实现高效的元素查找。具体地,输入一个 key ,在哈希表中查询并获取 value ,时间复杂度为 <span class="arithmatex">\(O(1)\)</span> 。</p>
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<p>例如,给定一个包含 <span class="arithmatex">\(n\)</span> 个学生的数据库,每个学生有“姓名 <code>name</code> ”和“学号 <code>id</code> ”两项数据,希望实现一个查询功能:<strong>输入一个学号,返回对应的姓名</strong>,则可以使用哈希表实现。</p>
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<p><img alt="哈希表的抽象表示" src="../hash_map.assets/hash_map.png" /></p>
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