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<h1 id="_1">什么是算法和数据结构？</h1>
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<p>你可能会在一些教材上看到这句话：</p>
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<p>程序 = 算法 + 数据结构</p>
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<p>算法（Algorithm）是指解题方案的准确而完整的描述，是一系列解决问题的清晰指令，算法代表着用系统的方法描述解决问题的策略机制。也就是说，能够对一定规范的输入，在有限时间内获得所要求的输出。
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数据结构（Data Structures）：是计算机存储和组织数据的一种方式，可以用来高效地处理数据。</p>
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<p>举个例子：二分查找就是一个非常经典的算法，而二分查找经常需要作用在一个有序数组上。这里二分就是一种折半的算法思想，
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而数组是我们最常用的一种数据结构，支持根据下标快速访问。很多算法需要特定的数据结构来实现，所以经常把它们放到一块讲。</p>
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<p>实际上，在真正的项目开发中，大部分时间都是 从数据库取数据 -&gt; 数据操作和结构化 -&gt; 返回给前端，在数据操作过程中需要合理地抽象，
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组织、处理数据，如果选用了错误的数据结构，就会造成代码运行低效。这也是我们需要学习算法和数据结构的原因。</p>
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<h1 id="_2">笨方法学算法</h1>
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<p>这里我们用一种很原始的『笨』方法来学习算法：纸笔模拟。</p>
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<li>阅读资料了解算法思想</li>
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<h1 id="_3">小问题</h1>
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<li>你还知道哪些经典的算法和数据结构？</li>
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<li>学习算法你觉得需要哪些预备知识？</li>
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<li>你了解 redis 吗，你知道它有哪几个常用的数据结构吗？你知道它的底层实现方式吗？</li>
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