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3.4 字符编码 *
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序
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序
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第 0 章 前言
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第 0 章 前言
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0.1 关于本书
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0.2 如何使用本书
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< a href = "../../chapter_preface/summary/" class = "md-nav__link" >
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0.3 小结
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第 1 章 初识算法
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第 1 章 初识算法
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1.1 算法无处不在
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1.2 算法是什么
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1.3 小结
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第 2 章 复杂度分析
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第 2 章 复杂度分析
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2.1 算法效率评估
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2.2 迭代与递归
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2.3 时间复杂度
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5.3 双向队列
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5.4 小结
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第 6 章 哈希表
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第 6 章 哈希表
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6.1 哈希表
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6.2 哈希冲突
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6.3 哈希算法
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6.4 小结
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第 7 章 树
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7.5 AVL 树 *
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第 8 章 堆
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< a href = "../../chapter_heap/heap/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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8.1 堆
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< / span >
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../chapter_heap/build_heap/" class = "md-nav__link" >
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8.2 建堆操作
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< / span >
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< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../chapter_heap/top_k/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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8.3 Top-k 问题
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< / span >
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< / a >
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< li class = "md-nav__item" >
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< a href = "../../chapter_heap/summary/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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8.4 小结
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< / span >
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< / a >
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< li class = "md-nav__item md-nav__item--nested" >
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< div class = "md-nav__link md-nav__container" >
< a href = "../../chapter_graph/" class = "md-nav__link " >
< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "m12 5.37-.44-.06L6 14.9c.24.21.4.48.47.78h11.06c.07-.3.23-.57.47-.78l-5.56-9.59-.44.06M6.6 16.53l4.28 2.53c.29-.27.69-.43 1.12-.43.43 0 .83.16 1.12.43l4.28-2.53H6.6M12 22a1.68 1.68 0 0 1-1.68-1.68l.09-.56-4.3-2.55c-.31.36-.76.58-1.27.58a1.68 1.68 0 0 1-1.68-1.68c0-.79.53-1.45 1.26-1.64V9.36c-.83-.11-1.47-.82-1.47-1.68A1.68 1.68 0 0 1 4.63 6c.55 0 1.03.26 1.34.66l4.41-2.53-.06-.45c0-.93.75-1.68 1.68-1.68.93 0 1.68.75 1.68 1.68l-.06.45 4.41 2.53c.31-.4.79-.66 1.34-.66a1.68 1.68 0 0 1 1.68 1.68c0 .86-.64 1.57-1.47 1.68v5.11c.73.19 1.26.85 1.26 1.64a1.68 1.68 0 0 1-1.68 1.68c-.51 0-.96-.22-1.27-.58l-4.3 2.55.09.56A1.68 1.68 0 0 1 12 22M10.8 4.86 6.3 7.44l.02.24c0 .71-.44 1.32-1.06 1.57l.03 5.25 5.51-9.64m2.4 0 5.51 9.64.03-5.25c-.62-.25-1.06-.86-1.06-1.57l.02-.24-4.5-2.58Z" / > < / svg >
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第 9 章 图
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< / span >
< / a >
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< span class = "md-nav__icon md-icon" > < / span >
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第 9 章 图
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< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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9.1 图
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< / span >
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< / a >
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< li class = "md-nav__item" >
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< a href = "../../chapter_graph/graph_operations/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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9.2 图基础操作
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< / span >
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../chapter_graph/graph_traversal/" class = "md-nav__link" >
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9.3 图的遍历
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< / span >
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< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../chapter_graph/summary/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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9.4 小结
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< / span >
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< / a >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle " type = "checkbox" id = "__nav_12" >
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< div class = "md-nav__link md-nav__container" >
< a href = "../../chapter_searching/" class = "md-nav__link " >
< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "m19.31 18.9 3.08 3.1L21 23.39l-3.12-3.07c-.69.43-1.51.68-2.38.68-2.5 0-4.5-2-4.5-4.5s2-4.5 4.5-4.5 4.5 2 4.5 4.5c0 .88-.25 1.71-.69 2.4m-3.81.1a2.5 2.5 0 0 0 0-5 2.5 2.5 0 0 0 0 5M21 4v2H3V4h18M3 16v-2h6v2H3m0-5V9h18v2h-2.03c-1.01-.63-2.2-1-3.47-1s-2.46.37-3.47 1H3Z" / > < / svg >
< span class = "md-ellipsis" >
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第 10 章 搜索
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< / span >
< / a >
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< / div >
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< nav class = "md-nav" data-md-level = "1" aria-labelledby = "__nav_12_label" aria-expanded = "false" >
< label class = "md-nav__title" for = "__nav_12" >
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< span class = "md-nav__icon md-icon" > < / span >
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第 10 章 搜索
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< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../chapter_searching/binary_search/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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10.1 二分查找
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< / span >
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< / a >
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< li class = "md-nav__item" >
< a href = "../../chapter_searching/binary_search_insertion/" class = "md-nav__link" >
< span class = "md-ellipsis" >
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10.2 二分查找插入点
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< / span >
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< li class = "md-nav__item" >
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< a href = "../../chapter_searching/binary_search_edge/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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10.3 二分查找边界
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< / span >
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< / a >
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< li class = "md-nav__item" >
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< a href = "../../chapter_searching/replace_linear_by_hashing/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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10.4 哈希优化策略
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< / span >
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< li class = "md-nav__item" >
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< a href = "../../chapter_searching/searching_algorithm_revisited/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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10.5 重识搜索算法
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< / span >
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< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../chapter_searching/summary/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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10.6 小结
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< / span >
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< / a >
< / li >
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< / ul >
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< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle " type = "checkbox" id = "__nav_13" >
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< div class = "md-nav__link md-nav__container" >
< a href = "../../chapter_sorting/" class = "md-nav__link " >
< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "M19 17h3l-4 4-4-4h3V3h2M2 17h10v2H2M6 5v2H2V5m0 6h7v2H2v-2Z" / > < / svg >
< span class = "md-ellipsis" >
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第 11 章 排序
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< / span >
< / a >
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< label class = "md-nav__link " for = "__nav_13" id = "__nav_13_label" tabindex = "0" >
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< / label >
< / div >
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< nav class = "md-nav" data-md-level = "1" aria-labelledby = "__nav_13_label" aria-expanded = "false" >
< label class = "md-nav__title" for = "__nav_13" >
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< span class = "md-nav__icon md-icon" > < / span >
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第 11 章 排序
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< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../chapter_sorting/sorting_algorithm/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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11.1 排序算法
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< / span >
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< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../chapter_sorting/selection_sort/" class = "md-nav__link" >
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< span class = "md-ellipsis" >
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11.2 选择排序
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11.3 冒泡排序
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11.4 插入排序
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11.5 快速排序
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11.6 归并排序
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11.7 堆排序
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11.8 桶排序
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11.9 计数排序
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11.10 基数排序
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11.11 小结
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第 12 章 分治
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第 12 章 分治
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12.1 分治算法
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12.2 分治搜索策略
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12.3 构建树问题
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12.4 汉诺塔问题
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12.5 小结
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第 13 章 回溯
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第 13 章 回溯
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13.1 回溯算法
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13.2 全排列问题
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13.3 子集和问题
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13.4 N 皇后问题
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13.5 小结
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14.3 DP 解题思路
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14.5 完全背包问题
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15.1 贪心算法
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第 16 章 附录
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16.1 编程环境安装
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3.4.1 ASCII 字符集
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3.4.2 GBK 字符集
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3.4.3 Unicode 字符集
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3.4.4 UTF-8 编码
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3.4.5 编程语言的字符编码
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< h1 id = "34" > 3.4 字符编码 *< a class = "headerlink" href = "#34" title = "Permanent link" > ¶ < / a > < / h1 >
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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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< h2 id = "341-ascii" > 3.4.1 ASCII 字符集< a class = "headerlink" href = "#341-ascii" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > < u > ASCII 码< / u > 是最早出现的字符集，其全称为 American Standard Code for Information Interchange（ ） ， ， （ ） < / p >
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< p > < a class = "glightbox" href = "../character_encoding.assets/ascii_table.png" data-type = "image" data-width = "100%" data-height = "auto" data-desc-position = "bottom" > < img alt = "ASCII 码" class = "animation-figure" src = "../character_encoding.assets/ascii_table.png" / > < / a > < / p >
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< p align = "center" > 图 3-6 ASCII 码 < / p >
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< p > 然而，< strong > ASCII 码仅能够表示英文< / strong > 。随着计算机的全球化，诞生了一种能够表示更多语言的 < u > EASCII< / u > 字符集。它在 ASCII 的 7 位基础上扩展到 8 位，能够表示 256 个不同的字符。< / p >
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< p > 在世界范围内，陆续出现了一批适用于不同地区的 EASCII 字符集。这些字符集的前 128 个字符统一为 ASCII 码，后 128 个字符定义不同，以适应不同语言的需求。< / p >
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< h2 id = "342-gbk" > 3.4.2 GBK 字符集< a class = "headerlink" href = "#342-gbk" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > 后来人们发现，< strong > EASCII 码仍然无法满足许多语言的字符数量要求< / strong > 。比如汉字有近十万个，光日常使用的就有几千个。中国国家标准总局于 1980 年发布了 < u > GB2312< / u > 字符集，其收录了 6763 个汉字，基本满足了汉字的计算机处理需要。< / p >
< p > 然而， < u > GBK< / u > 字符集是在 GB2312 的基础上扩展得到的，它共收录了 21886 个汉字。在 GBK 的编码方案中， < / p >
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< h2 id = "343-unicode" > 3.4.3 Unicode 字符集< a class = "headerlink" href = "#343-unicode" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > 随着计算机技术的蓬勃发展，字符集与编码标准百花齐放，而这带来了许多问题。一方面，这些字符集一般只定义了特定语言的字符，无法在多语言环境下正常工作。另一方面，同一种语言存在多种字符集标准，如果两台计算机使用的是不同的编码标准，则在信息传递时就会出现乱码。< / p >
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< p > 那个时代的研究人员就在想：< strong > 如果推出一个足够完整的字符集，将世界范围内的所有语言和符号都收录其中，不就可以解决跨语言环境和乱码问题了吗< / strong > ？在这种想法的驱动下，一个大而全的字符集 Unicode 应运而生。< / p >
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< p > < u > Unicode< / u > 的中文名称为“统一码”，理论上能容纳 100 多万个字符。它致力于将全球范围内的字符纳入统一的字符集之中，提供一种通用的字符集来处理和显示各种语言文字，减少因为编码标准不同而产生的乱码问题。< / p >
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< p > 自 1991 年发布以来， ， < / p >
< p > Unicode 是一种通用字符集，本质上是给每个字符分配一个编号（称为“码点”），< strong > 但它并没有规定在计算机中如何存储这些字符码点< / strong > 。我们不禁会问：当多种长度的 Unicode 码点同时出现在一个文本中时，系统如何解析字符？例如给定一个长度为 2 字节的编码，系统如何确认它是一个 2 字节的字符还是两个 1 字节的字符？< / p >
< p > 对于以上问题，< strong > 一种直接的解决方案是将所有字符存储为等长的编码< / strong > 。如图 3-7 所示， < / p >
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< p > < a class = "glightbox" href = "../character_encoding.assets/unicode_hello_algo.png" data-type = "image" data-width = "100%" data-height = "auto" data-desc-position = "bottom" > < img alt = "Unicode 编码示例" class = "animation-figure" src = "../character_encoding.assets/unicode_hello_algo.png" / > < / a > < / p >
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< p align = "center" > 图 3-7 Unicode 编码示例 < / p >
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< p > 然而 ASCII 码已经向我们证明，编码英文只需 1 字节。若采用上述方案，英文文本占用空间的大小将会是 ASCII 编码下的两倍，非常浪费内存空间。因此，我们需要一种更加高效的 Unicode 编码方法。< / p >
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< h2 id = "344-utf-8" > 3.4.4 UTF-8 编码< a class = "headerlink" href = "#344-utf-8" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > 目前， < strong > 它是一种可变长度的编码< / strong > ，使用 1 到 4 字节来表示一个字符， < / p >
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< p > UTF-8 的编码规则并不复杂，分为以下两种情况。< / p >
< ul >
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< li > 对于长度为 1 字节的字符，将最高位设置为 < span class = "arithmatex" > \(0\)< / span > ，其余 7 位设置为 Unicode 码点。值得注意的是， < strong > UTF-8 编码可以向下兼容 ASCII 码< / strong > 。这意味着我们可以使用 UTF-8 来解析年代久远的 ASCII 码文本。< / li >
< li > 对于长度为 < span class = "arithmatex" > \(n\)< / span > 字节的字符（其中 < span class = "arithmatex" > \(n > 1\)< / span > ），将首个字节的高 < span class = "arithmatex" > \(n\)< / span > 位都设置为 < span class = "arithmatex" > \(1\)< / span > ，第 < span class = "arithmatex" > \(n + 1\)< / span > 位设置为 < span class = "arithmatex" > \(0\)< / span > ；从第二个字节开始，将每个字节的高 2 位都设置为 < span class = "arithmatex" > \(10\)< / span > ；其余所有位用于填充字符的 Unicode 码点。< / li >
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< / ul >
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< p > 图 3-8 展示了“Hello算法”对应的 UTF-8 编码。观察发现，由于最高 < span class = "arithmatex" > \(n\)< / span > 位都设置为 < span class = "arithmatex" > \(1\)< / span > ，因此系统可以通过读取最高位 < span class = "arithmatex" > \(1\)< / span > 的个数来解析出字符的长度为 < span class = "arithmatex" > \(n\)< / span > 。< / p >
< p > 但为什么要将其余所有字节的高 2 位都设置为 < span class = "arithmatex" > \(10\)< / span > 呢？实际上，这个 < span class = "arithmatex" > \(10\)< / span > 能够起到校验符的作用。假设系统从一个错误的字节开始解析文本，字节头部的 < span class = "arithmatex" > \(10\)< / span > 能够帮助系统快速判断出异常。< / p >
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< p > 之所以将 < span class = "arithmatex" > \(10\)< / span > 当作校验符，是因为在 UTF-8 编码规则下，不可能有字符的最高两位是 < span class = "arithmatex" > \(10\)< / span > 。这个结论可以用反证法来证明：假设一个字符的最高两位是 < span class = "arithmatex" > \(10\)< / span > ，说明该字符的长度为 < span class = "arithmatex" > \(1\)< / span > ，对应 ASCII 码。而 ASCII 码的最高位应该是 < span class = "arithmatex" > \(0\)< / span > ，与假设矛盾。< / p >
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< p > < a class = "glightbox" href = "../character_encoding.assets/utf-8_hello_algo.png" data-type = "image" data-width = "100%" data-height = "auto" data-desc-position = "bottom" > < img alt = "UTF-8 编码示例" class = "animation-figure" src = "../character_encoding.assets/utf-8_hello_algo.png" / > < / a > < / p >
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< p align = "center" > 图 3-8 UTF-8 编码示例 < / p >
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< p > 除了 UTF-8 之外，常见的编码方式还包括以下两种。< / p >
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< ul >
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< li > < strong > UTF-16 编码< / strong > ：使用 2 或 4 字节来表示一个字符。所有的 ASCII 字符和常用的非英文字符，都用 2 字节表示；少数字符需要用到 4 字节表示。对于 2 字节的字符， < / li >
< li > < strong > UTF-32 编码< / strong > ：每个字符都使用 4 字节。这意味着 UTF-32 比 UTF-8 和 UTF-16 更占用空间，特别是对于 ASCII 字符占比较高的文本。< / li >
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< / ul >
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< p > 从存储空间占用的角度看，使用 UTF-8 表示英文字符非常高效，因为它仅需 1 字节；使用 UTF-16 编码某些非英文字符（例如中文）会更加高效，因为它仅需 2 字节，而 UTF-8 可能需要 3 字节。< / p >
< p > 从兼容性的角度看， < / p >
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< h2 id = "345" > 3.4.5 编程语言的字符编码< a class = "headerlink" href = "#345" title = "Permanent link" > ¶ < / a > < / h2 >
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< p > 对于以往的大多数编程语言，程序运行中的字符串都采用 UTF-16 或 UTF-32 这类等长编码。在等长编码下，我们可以将字符串看作数组来处理，这种做法具有以下优点。< / p >
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< ul >
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< li > < strong > 随机访问< / strong > ： < span class = "arithmatex" > \(i\)< / span > 个字符，我们需要从字符串的开始处遍历到第 < span class = "arithmatex" > \(i\)< / span > 个字符，这需要 < span class = "arithmatex" > \(O(n)\)< / span > 的时间。< / li >
< li > < strong > 字符计数< / strong > ：与随机访问类似，计算 UTF-16 编码的字符串的长度也是 < span class = "arithmatex" > \(O(1)\)< / span > 的操作。但是，计算 UTF-8 编码的字符串的长度需要遍历整个字符串。< / li >
< li > < strong > 字符串操作< / strong > ：在 UTF-16 编码的字符串上，很多字符串操作（如分割、连接、插入、删除等）更容易进行。在 UTF-8 编码的字符串上，进行这些操作通常需要额外的计算，以确保不会产生无效的 UTF-8 编码。< / li >
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< / ul >
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< p > 实际上，编程语言的字符编码方案设计是一个很有趣的话题，涉及许多因素。< / p >
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< ul >
< li > Java 的 < code > String< / code > 类型使用 UTF-16 编码，每个字符占用 2 字节。这是因为 Java 语言设计之初，人们认为 16 位足以表示所有可能的字符。然而，这是一个不正确的判断。后来 Unicode 规范扩展到了超过 16 位，所以 Java 中的字符现在可能由一对 16 位的值（称为“代理对”）表示。< / li >
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< li > JavaScript 和 TypeScript 的字符串使用 UTF-16 编码的原因与 Java 类似。当 1995 年 Netscape 公司首次推出 JavaScript 语言时， < / li >
< li > C# 使用 UTF-16 编码，主要是因为 .NET 平台是由 Microsoft 设计的，而 Microsoft 的很多技术（包括 Windows 操作系统）都广泛使用 UTF-16 编码。< / li >
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< / ul >
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< p > 由于以上编程语言对字符数量的低估，它们不得不采取“代理对”的方式来表示超过 16 位长度的 Unicode 字符。这是一个不得已为之的无奈之举。一方面，包含代理对的字符串中，一个字符可能占用 2 字节或 4 字节，从而丧失了等长编码的优势。另一方面，处理代理对需要额外增加代码，这提高了编程的复杂性和调试难度。< / p >
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< p > 出于以上原因，部分编程语言提出了一些不同的编码方案。< / p >
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< ul >
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< li > Python 中的 < code > str< / code > 使用 Unicode 编码，并采用一种灵活的字符串表示，存储的字符长度取决于字符串中最大的 Unicode 码点。若字符串中全部是 ASCII 字符，则每个字符占用 1 字节；如果有字符超出了 ASCII 范围， （ ） ， < / li >
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< li > Go 语言的 < code > string< / code > 类型在内部使用 UTF-8 编码。Go 语言还提供了 < code > rune< / code > 类型，它用于表示单个 Unicode 码点。< / li >
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< li > Rust 语言的 < code > str< / code > 和 < code > String< / code > 类型在内部使用 UTF-8 编码。Rust 也提供了 < code > char< / code > 类型，用于表示单个 Unicode 码点。< / li >
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< / ul >
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< p > 需要注意的是，以上讨论的都是字符串在编程语言中的存储方式，< strong > 这和字符串如何在文件中存储或在网络中传输是不同的问题< / strong > 。在文件存储或网络传输中，我们通常会将字符串编码为 UTF-8 格式，以达到最优的兼容性和空间效率。< / p >
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