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<time class="post-time" title="2020-02-17 14:29:27" datetime="2020-02-17T06:29:27.796Z" itemprop="datePublished">2020-02-17</time>
<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/categories/Data-Science/">Data Science</a></li></ul>
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<a class="post-title-link" href="/2020/02/17/DataCleaning(2)/">Data transformation pipeline - Data Cleaning(2)</a>
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Data Cleaning(2)Creating a deployable artifact The next job we need to do is to package our application after cleaning data. If my code consists of many modules, I must package them in the zip...
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<time class="post-time" title="2020-02-16 22:20:38" datetime="2020-02-16T14:20:38.112Z" itemprop="datePublished">2020-02-16</time>
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<a class="post-title-link" href="/2020/02/16/DataCleaning/">Data transformation pipeline - Data Cleaning(1)</a>
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Data Cleaning(1)Why we should clean data? Most data sources people work with are not ready for analytics. Hence, the second step in the data transformation pipeline is cleaning the data.
How t...
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<article id="post-一些递归算法的总结"
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<time class="post-time" title="2020-02-07 22:42:55" datetime="2020-02-07T14:42:55.941Z" itemprop="datePublished">2020-02-07</time>
<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/categories/Algorithm/">Algorithm</a></li></ul>
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<h3 class="post-title" itemprop="name">
<a class="post-title-link" href="/2020/02/07/%E4%B8%80%E4%BA%9B%E9%80%92%E5%BD%92%E7%AE%97%E6%B3%95%E7%9A%84%E6%80%BB%E7%BB%93/">一些关于递归算法的总结</a>
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简述  递归是函数调用函数本身，并且每一次都做相同的动作。因此在看待递归时，只需要将子问题解决（解决子问题的时候需要使用到当前解），合并到当前的解中，然后去递归的求解下一个子问题，直到最大的问题的解被解决。  下面两个问题虽然都和反转链表有关，虽然我都使用了递归求解，但是仔细品味，两者递归的使用，虽然都是正确的，但是它们表达出的思想是不同的。
第一题：...
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<time class="post-time" title="2020-02-05 12:17:22" datetime="2020-02-05T04:17:22.469Z" itemprop="datePublished">2020-02-05</time>
<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/categories/Algorithm/">Algorithm</a></li></ul>
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<a class="post-title-link" href="/2020/02/05/leetcode_%E6%9C%80%E9%95%BF%E5%9B%9E%E6%96%87%E5%AD%90%E4%B8%B2/">最长回文子串</a>
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题目描述给定一个字符串 s，找到 s 中最长的回文子串。你可以假设 s 的最大长度为 1000。例如123输入: "babad"输出: "bab"注意: "aba" 也是一个有效答案。12输入: "cbbd"输出: "bb"
实现思路方法一：暴力算法枚举所有字串，花费为 $ O(n^2) $ ...
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<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/dp/" rel="tag">dp</a></li><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/%E4%B8%AD%E5%BF%83%E6%89%A9%E5%B1%95-Manacher%EF%BC%88%E6%9A%82%E6%9C%AA%E5%AE%9E%E7%8E%B0%EF%BC%89/" rel="tag">中心扩展/Manacher（暂未实现）</a></li></ul>
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<time class="post-time" title="2020-02-04 14:17:54" datetime="2020-02-04T06:17:54.951Z" itemprop="datePublished">2020-02-04</time>
<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/categories/Algorithm/">Algorithm</a></li></ul>
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<a class="post-title-link" href="/2020/02/04/leetcode_%E6%97%A0%E9%87%8D%E5%A4%8D%E5%AD%97%E7%AC%A6%E7%9A%84%E6%9C%80%E9%95%BF%E5%AD%90%E4%B8%B2/">无重复字符的最长子串</a>
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题目描述给定一个字符串，请你找出其中不含有重复字符的 最长子串 的长度[注]子串是连续的，子序列是可以不连续的
例如:123输入: "abcabcbb"输出: 3 解释: 因为无重复字符的最长子串是 "abc"，所以其长度为 3。1234输入: "pwwkew"输出: 3解释: 因为无重复字符的最长子串是 "wke&quo...
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<article id="post-JVM垃圾收集器小结（一）"
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<time class="post-time" title="2020-01-23 16:08:51" datetime="2020-01-23T08:08:51.936Z" itemprop="datePublished">2020-01-23</time>
<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/categories/Java%E5%AD%A6%E4%B9%A0/">Java学习</a></li></ul>
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<a class="post-title-link" href="/2020/01/23/JVM%E5%9E%83%E5%9C%BE%E6%94%B6%E9%9B%86%E5%99%A8%E5%B0%8F%E7%BB%93%EF%BC%88%E4%B8%80%EF%BC%89/">JVM垃圾收集器小结（一）</a>
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JVM垃圾收集器小结（一）一、可达性分析算法  在可达性分析算法中一个核心概念是 GC Root。  垃圾收集器通过从GC Root对象开始，根据引用关系，向下搜索，搜索过程所走过的路径称为“引用链”(Reference Chain)。如果某个对象到GC Root是有引用链相连的，那么这个对象就是可达的。  在垃圾收集执行过程中，第...
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<article id="post-构造器调用顺序"
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<time class="post-time" title="2020-01-22 14:30:11" datetime="2020-01-22T06:30:11.799Z" itemprop="datePublished">2020-01-22</time>
<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/categories/Java%E5%AD%A6%E4%B9%A0/">Java学习</a></li></ul>
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<a class="post-title-link" href="/2020/01/22/%E6%9E%84%E9%80%A0%E5%99%A8%E8%B0%83%E7%94%A8%E9%A1%BA%E5%BA%8F/">构造器调用顺序</a>
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Java构造器调用顺序继承关系图：Meal->Lunch->PortableLunch->SandWich
递归的调用基类构造器。首先构造继承结构中的根类，然后是下一层导出类，直到当前类
按声明顺序调用成员的初始化方法
调用导出类构造器的主体123456789101112131415161718192021222324252627282930313233343536373...
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<time class="post-time" title="2020-01-18 22:33:23" datetime="2020-01-18T14:33:23.906Z" itemprop="datePublished">2020-01-18</time>
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MySQL索引及底层实现一、什么是索引
“A database index is a data structure that improves the speed of operations in a table”–MySQL Tutorial
将以上索引定义翻译成中文，即 索引是用来提高操作数据表速度的数据结构
二、为什么要使用索引  在对数据表进行查询时，若所查询的...
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<time class="post-time" title="2020-01-16 11:44:02" datetime="2020-01-16T03:44:02.283Z" itemprop="datePublished">2020-01-16</time>
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JDK动态代理实现与原理一、代理模式  代理模式(Proxy Pattern) 是程序设计中的一种设计模式，结构如下图。代理类为委托（实现）类提供代理，以控制对委托类对象的访问。代理类负责为委托类预处理消息，过滤并转发消息，以及进行消息被委托类执行后的后续处理。  为了保持行为的一致，代理类和委托类通常实现同样的接口，通过代理类可以对委托类对象进行访问...
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Java虚拟机——自动内存管理第二章 Java内存区域与内存溢出异常
2.3 HotSpot 虚拟机对象探秘2.3.1 对象的创建在JVM中，一个对象（普通JAVA对象）被创建过程如下：
当Java虚拟机遇到一条字节码new指令时，首先检查此参数是否能在常量池中定位到一个类的符号引用
检查符号引用代表的类是否已经被加载、解析和初始化过，若没有则执行类加载过程。
给新生对象在Java堆中分配...
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