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<h2 id="链表（上）：如何实现LRU缓存淘汰算法"><a href="#链表（上）：如何实现LRU缓存淘汰算法" class="headerlink" title="链表（上）：如何实现LRU缓存淘汰算法?"></a>链表（上）：如何实现LRU缓存淘汰算法?</h2><blockquote>
<p>链表（Linked list）这个数据结构。<br>学习链表有什么用呢？为了回答这个问题，我们先来讨论一个经典的链表应用场景，那就是 LRU 缓存淘汰算法。</p>
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<p>缓存是一种提高数据读取性能的技术，在硬件设计、软件开发中都有着非常广泛的应用，比如常见的CPU缓存、数据库缓存、浏览器缓存等等。</p>
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<h2 id="数组：为什么很多编程语言中数组都从0开始编号"><a href="#数组：为什么很多编程语言中数组都从0开始编号" class="headerlink" title="数组：为什么很多编程语言中数组都从0开始编号"></a>数组：为什么很多编程语言中数组都从0开始编号</h2><h3 id="一：什么是数组"><a href="#一：什么是数组" class="headerlink" title="一：什么是数组"></a>一：什么是数组</h3><p>数组（Array）是一种线性表数据结构。它用一组连续的内存空间，来存储一组具有相同类型的数据。</p>
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<h2 id="四个复杂度"><a href="#四个复杂度" class="headerlink" title="四个复杂度"></a>四个复杂度</h2><ul>
<li>最坏情况时间复杂度 代码在最理想情况下执行的时间复杂度。</li>
<li>最好情况时间复杂度：代码在最坏情况下执行的时间复杂度。</li>
<li>平均时间复杂度：用代码在所有情况下执行的次数的加权平均值表示。</li>
<li>均摊时间复杂度：在代码执行的所有复杂度情况中绝大部分是低级别的复杂度，个别情况是高级别复杂度且发生具有时序关系时，可以将个别高级别复杂度均摊到低级别复杂度上。基本上均摊结果就等于低级别复杂度。</li>
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<a class="post-title-link" href="/2018/12/26/Mac的一些命令/" itemprop="url">Mac的一些命令</a></h1>
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<h2 id="mac命令"><a href="#mac命令" class="headerlink" title="mac命令"></a>mac命令</h2><p>总结一些常用的命令行，用于熟练和记忆</p>
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<li>查看文件MD5：</li>
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">md5[空格][拖曳要检测的文件到此处]</span><br><span class="line"></span><br><span class="line">命令 md5 -s 123455667</span><br><span class="line"></span><br><span class="line">MD5 ("123455667") = aa8145f5aba38263cebc4038d0ebe849</span><br></pre></td></tr></table></figure>
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<h2 id="Mac上Gradle安装与安装其他版本"><a href="#Mac上Gradle安装与安装其他版本" class="headerlink" title="Mac上Gradle安装与安装其他版本"></a>Mac上Gradle安装与安装其他版本</h2><p>报错：==org.gradle.api.tasks.compile.CompileOptions.setBootClasspath(Ljava/lang/String;)V==</p>
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