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‎PART_1_算法基础/README.md

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## PART I 算法基础
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## PART_1_算法基础
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[下载 XMIND 完整版](https://www.cxyhub.com/all/programming/12460/)
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‎PART_2_力扣图解/README.md

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## PART II 算法图解题典
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## PART_2_力扣图解
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| Title | 分类 | 难度 |
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|---|---|---|

‎PART_3_大厂面试/README.md

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## PART_3_大厂面试
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考虑到现在网上面经实在太杂，很多都冠以 “BAT” 之名，重复率、错误率都非常高。所以我尽可能的挑选出了我认为比较好的 50 篇面经（基本不重复），并对内容做了分类。
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建议大家把这个页面收藏起来，防止后面需要的时候找不到了。
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希望大家可以点个 star 支持一下~
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- [系统设计-长文（非常建议读，我自己也看了）](https://github.com/donnemartin/system-design-primer/blob/master/README-zh-Hans.md)
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- [后端-社招(两年): 蚂蚁 头条 PingCAP](https://github.com/aylei/interview)
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- [后端-京东-JAVA](https://www.cnblogs.com/wupeixuan/p/8908524.html#%E4%B8%80%E3%80%81java)
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- [后端-百度-高并发抢红包设计](https://github.com/xbox1994/Java-Interview/blob/master/MD/%E7%B3%BB%E7%BB%9F%E8%AE%BE%E8%AE%A1-%E9%AB%98%E5%B9%B6%E5%8F%91%E6%8A%A2%E7%BA%A2%E5%8C%85.md)
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- [NLP（机器学习）-百度](https://www.e-learn.cn/topic/95743)

‎PART_3_大厂面试/京东篇.zip renamed to ‎PART_3_大厂面试/汇总/京东篇.zip

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‎hello-algorithm.iml

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<?xml version="1.0" encoding="UTF-8"?>
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<module type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/03_01_DuplicationInArray" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/03_02_DuplicationInArrayNoEdit" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/04_FindInPartiallySortedMatrix" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/05_ReplaceSpaces" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/06_PrintListInReversedOrder" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/07_ConstructBinaryTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/08_NextNodeInBinaryTrees" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/09_01_QueueWithTwoStacks" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/09_02_StackWithTwoQueues" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/10_01_Fibonacci" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/10_02_JumpFloor" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/10_03_JumpFloorII" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/10_04_RectCover" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/11_MinNumberInRotatedArray" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/12_StringPathInMatrix" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/13_RobotMove" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/14_CuttingRope" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/15_NumberOf1InBinary" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/16_Power" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/17_Print1ToMaxOfNDigits" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/18_01_DeleteNodeInList" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/18_02_DeleteDuplicatedNode" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/19_RegularExpressionsMatching" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/20_NumericStrings" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/21_ReorderArray" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/22_KthNodeFromEnd" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/23_EntryNodeInListLoop" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/24_ReverseList" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/25_MergeSortedLists" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/26_SubstructureInTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/27_MirrorOfBinaryTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/28_SymmetricalBinaryTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/29_PrintMatrix" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/30_MinInStack" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/31_StackPushPopOrder" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/32_01_PrintTreeFromTopToBottom" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/32_02_PrintTreesInLines" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/32_03_PrintTreesInZigzag" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/33_SquenceOfBST" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/34_PathInTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/35_CopyComplexList" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/36_ConvertBinarySearchTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/37_SerializeBinaryTrees" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/38_StringPermutation" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/39_MoreThanHalfNumber" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/40_KLeastNumbers" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/41_StreamMedian" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/42_GreatestSumOfSubarrays" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/43_NumberOf1" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/44_DigitsInSequence" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/45_SortArrayForMinNumber" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/46_TranslateNumbersToStrings" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/47_MaxValueOfGifts" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/48_LongestSubstringWithoutDup" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/49_UglyNumber" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/50_01_FirstNotRepeatingChar" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/50_02_FristCharacterInStream" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/52_FirstCommonNodesInLists" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/53_01_NumberOfK" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/53_02_MissingNumber" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/53_03_IntegerIdenticalToIndex" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/54_KthNodeInBST" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/55_01_TreeDepth" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/55_02_BalancedBinaryTree" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/56_01_NumbersAppearOnce" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/56_02_NumberAppearingOnce" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/57_01_TwoNumbersWithSum" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/57_02_ContinuousSquenceWithSum" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/58_01_ReverseWordsInSentence" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/58_02_LeftRotateString" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/59_01_MaxInSlidingWindow" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/专栏/剑指offer/61_ContinousCards" isTestSource="false" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎other/designpattern/中介者模式.md

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## 中介者（Mediator）
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### 介绍
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中介者模式（Mediator Pattern）是用来降低多个对象和类之间的通信复杂性。这种模式提供了一个中介类，该类通常处理不同类之间的通信，并支持松耦合，使代码易于维护。中介者模式属于行为型模式。
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### Intent
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集中相关对象之间复杂的沟通和控制方式。
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### Class Diagram
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- Mediator：中介者，定义一个接口用于与各同事（Colleague）对象通信。
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- Colleague：同事，相关对象
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/30d6e95c-2e3c-4d32-bf4f-68128a70bc05.png"/> </div><br>
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### Implementation
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Alarm（闹钟）、CoffeePot（咖啡壶）、Calendar（日历）、Sprinkler（喷头）是一组相关的对象，在某个对象的事件产生时需要去操作其它对象，形成了下面这种依赖结构：
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/82cfda3b-b53b-4c89-9fdb-26dd2db0cd02.jpg"/> </div><br>
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使用中介者模式可以将复杂的依赖结构变成星形结构：
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/5359cbf5-5a79-4874-9b17-f23c53c2cb80.jpg"/> </div><br>
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```java
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public abstract class Colleague {
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public abstract void onEvent(Mediator mediator);
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}
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```
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```java
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public class Alarm extends Colleague {
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@Override
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public void onEvent(Mediator mediator) {
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mediator.doEvent("alarm");
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}
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public void doAlarm() {
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System.out.println("doAlarm()");
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}
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}
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```
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```java
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public class CoffeePot extends Colleague {
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@Override
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public void onEvent(Mediator mediator) {
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mediator.doEvent("coffeePot");
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}
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public void doCoffeePot() {
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System.out.println("doCoffeePot()");
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}
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}
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```
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```java
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public class Calender extends Colleague {
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@Override
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public void onEvent(Mediator mediator) {
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mediator.doEvent("calender");
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}
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public void doCalender() {
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System.out.println("doCalender()");
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}
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}
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```
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```java
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public class Sprinkler extends Colleague {
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@Override
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public void onEvent(Mediator mediator) {
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mediator.doEvent("sprinkler");
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}
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public void doSprinkler() {
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System.out.println("doSprinkler()");
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}
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}
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```
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```java
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public abstract class Mediator {
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public abstract void doEvent(String eventType);
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}
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```
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```java
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public class ConcreteMediator extends Mediator {
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private Alarm alarm;
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private CoffeePot coffeePot;
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private Calender calender;
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private Sprinkler sprinkler;
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public ConcreteMediator(Alarm alarm, CoffeePot coffeePot, Calender calender, Sprinkler sprinkler) {
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this.alarm = alarm;
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this.coffeePot = coffeePot;
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this.calender = calender;
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this.sprinkler = sprinkler;
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}
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@Override
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public void doEvent(String eventType) {
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switch (eventType) {
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case "alarm":
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doAlarmEvent();
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break;
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case "coffeePot":
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doCoffeePotEvent();
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break;
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case "calender":
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doCalenderEvent();
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break;
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default:
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doSprinklerEvent();
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}
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}
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public void doAlarmEvent() {
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alarm.doAlarm();
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coffeePot.doCoffeePot();
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calender.doCalender();
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sprinkler.doSprinkler();
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}
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public void doCoffeePotEvent() {
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// ...
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}
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public void doCalenderEvent() {
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// ...
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}
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public void doSprinklerEvent() {
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// ...
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}
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}
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```
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```java
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public class Client {
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public static void main(String[] args) {
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Alarm alarm = new Alarm();
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CoffeePot coffeePot = new CoffeePot();
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Calender calender = new Calender();
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Sprinkler sprinkler = new Sprinkler();
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Mediator mediator = new ConcreteMediator(alarm, coffeePot, calender, sprinkler);
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// 闹钟事件到达，调用中介者就可以操作相关对象
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alarm.onEvent(mediator);
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}
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}
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```
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```java
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doAlarm()
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doCoffeePot()
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doCalender()
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doSprinkler()
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```
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### JDK
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- All scheduleXXX() methods of [java.util.Timer](http://docs.oracle.com/javase/8/docs/api/java/util/Timer.html)
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- [java.util.concurrent.Executor#execute()](http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html#execute-java.lang.Runnable-)
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- submit() and invokeXXX() methods of [java.util.concurrent.ExecutorService](http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html)
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- scheduleXXX() methods of [java.util.concurrent.ScheduledExecutorService](http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledExecutorService.html)
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- [java.lang.reflect.Method#invoke()](http://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Method.html#invoke-java.lang.Object-java.lang.Object...-)
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你可以通过下方扫码回复【进群】，加入我们的高端计算机学习群！以及下载超过 100 张高清思维导图！
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<div align="center">
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<a href="https://www.geekxh.com/code.png" style="box-shadow: rgb(210, 210, 210) 0em 0em 0.5em 0px; font-size: 17px;"><img src="https://www.geekxh.com/code.png" width="250px"></a>
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</div>
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‎other/designpattern/享元模式.md

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## 享元（Flyweight）
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### 介绍
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享元模式（Flyweight Pattern）主要用于减少创建对象的数量，以减少内存占用和提高性能。这种类型的设计模式属于结构型模式，它提供了减少对象数量从而改善应用所需的对象结构的方式。
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享元模式尝试重用现有的同类对象，如果未找到匹配的对象，则创建新对象。我们将通过创建 5 个对象来画出 20 个分布于不同位置的圆来演示这种模式。由于只有 5 种可用的颜色，所以 color 属性被用来检查现有的 Circle 对象。
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### Intent
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利用共享的方式来支持大量细粒度的对象，这些对象一部分内部状态是相同的。
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### Class Diagram
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- Flyweight：享元对象
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- IntrinsicState：内部状态，享元对象共享内部状态
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- ExtrinsicState：外部状态，每个享元对象的外部状态不同
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<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/5f5c22d5-9c0e-49e1-b5b0-6cc7032724d4.png"/> </div><br>
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### Implementation
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```java
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public interface Flyweight {
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void doOperation(String extrinsicState);
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}
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```
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```java
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public class ConcreteFlyweight implements Flyweight {
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private String intrinsicState;
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public ConcreteFlyweight(String intrinsicState) {
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this.intrinsicState = intrinsicState;
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}
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@Override
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public void doOperation(String extrinsicState) {
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System.out.println("Object address: " + System.identityHashCode(this));
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System.out.println("IntrinsicState: " + intrinsicState);
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System.out.println("ExtrinsicState: " + extrinsicState);
43+
}
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}
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```
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```java
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public class FlyweightFactory {
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private HashMap<String, Flyweight> flyweights = new HashMap<>();
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Flyweight getFlyweight(String intrinsicState) {
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if (!flyweights.containsKey(intrinsicState)) {
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Flyweight flyweight = new ConcreteFlyweight(intrinsicState);
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flyweights.put(intrinsicState, flyweight);
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}
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return flyweights.get(intrinsicState);
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}
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}
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```
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```java
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public class Client {
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public static void main(String[] args) {
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FlyweightFactory factory = new FlyweightFactory();
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Flyweight flyweight1 = factory.getFlyweight("aa");
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Flyweight flyweight2 = factory.getFlyweight("aa");
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flyweight1.doOperation("x");
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flyweight2.doOperation("y");
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}
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}
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```
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```html
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Object address: 1163157884
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IntrinsicState: aa
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ExtrinsicState: x
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Object address: 1163157884
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IntrinsicState: aa
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ExtrinsicState: y
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```
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### JDK
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Java 利用缓存来加速大量小对象的访问时间。
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- java.lang.Integer#valueOf(int)
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- java.lang.Boolean#valueOf(boolean)
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- java.lang.Byte#valueOf(byte)
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- java.lang.Character#valueOf(char)
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你可以通过下方扫码回复【进群】，加入我们的高端计算机学习群！以及下载超过 100 张高清思维导图！
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<div align="center">
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<a href="https://www.geekxh.com/code.png" style="box-shadow: rgb(210, 210, 210) 0em 0em 0.5em 0px; font-size: 17px;"><img src="https://www.geekxh.com/code.png" width="250px"></a>
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</div>
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