今天突然看到一个名词,游程编码.也叫行程编码. 简单理解就是,几个相同连续的字符,然后用数字统计表示. 举个例子: aaaabbbccc 用游程编码的表示就是4a3b3c 如果:连续字符只有一个 那么使用游程编码会增加存储空间,比如:a ===> 游程编码表示成1a 如果,连续字符只有两个,使用游程编码基本没什么意义.…

一.什么是游程编码 游程编码是一种比较简单的压缩算法,其基本思想是将重复且连续出现多次的字符使用(连续出现次数,某个字符)来描述. 比如一个字符串: AAAAABBBBCCC 使用游程编码可以将其描述为: 5A4B3C 5A表示这个地方有5个连续的A,同理4B表示有4个连续的B,3C表示有3个连续的C,其它情况以此类推. 原字符串需要12个字符才能描述,而使用游程编码压缩之后只需要6个字符就可以表示,还原回去的时候只需要将字符重复n次即可,这是个原理非常简单的算法. 再来分析一下这个编码的适用场…

游程编码(Run Length Coding, RLC)是串处理中常见的预处理方法.其写法是典型的双指针(Two-Pointer).下面总结其写法1.输入为一串整数可以不把整数存在数组里…

http://poj.org/problem?id=1782 Run Length Encoding Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 3907   Accepted: 1282 Description Your task is to write a program that performs a simple form of run-length encoding, as described by the…

How to run Python Code from Sublime,and How to run Python Code with input from sublime Using SublimeREPL To install it you need package control this lets you easily install plugins. Follow the instructions. Once thats done: in Sublime press Ctrl + Sh…

前言 其实我是不太愿意写这种工具使用博客的,因为实在没有营养,只是有些简单问题,搜索一番,却始终找不到答案,遂以博客记录下来,希望后面的人,可以省去搜索之苦. 相信你搜到这篇博客,肯定是已经安装好了PHP Code Sniffer,所以安装过程,我们就省略掉,这方面文章也挺多的,搜一下即可 此文仅对编译安装的php且只设置了环境变量,才能起效,如果不是就不要浪费时间看了 原因 phpstorm默认执行php脚本是/usr/bin/php 来执行的,如果你是编译安装,并且只设置了环境变量,那执行/…

点我看题目 题意 :将给定的字符串编码,编码的规则根据两条,1.如果字符串里有连续相等的字符,就变为两个字符,一个是这些连续相同的字符的个数,另一个是这个字符,但是如果数量超过了9个,那就输出9再输出这个字符,剩下的重新按照规则进行,例如AAAA,就输出4A,AAAAAAAAAAA输出9A2A,2.如果字符串里有连续不相等的字符,就将这些字符原样输出并且在前后各加一个1,如果字符串里有刚好有个1,就将这个1变为11,AAAABCCC输出4A1B13C,123444输出11123134,11111…

列式系统可提供的优势 对于查询内容之外的列,不必执行I/O和解压(若适用)操作 非常适合仅访问小部分列的查询.如果访问的列很多,则行存格式更为合适 相比由多行构成的数据块,列内的信息熵更低,所以从压缩角度来看,列式存储通常会非常高效.换句话说,同一列中的数据比行存数据块中的数据更为相似.当某一列的取值不多是,行存与列存在压缩效果上的差异尤为显著 数据仓库类型的应用需要在极大的数据集上对某些特定的列进行聚合操作,而列式存储格式通常很适合此类应用场景 显然,列式文件格式也常常出现在Hadoop的应用…

Chapter6 Controlling Database Location,Creation Process, and Seed Data 第6章 控制数据库位置,创建过程和种子数据 In previous chapters you have seen how convention and configuration can be used to affect the model and the resulting database schema. In this chapter you wi…

第7章 高级概念 The Code First modeling functionality that you have seen so far should be enough to get you up and running with most applications. However, Code First also includes some more advanced functionality that you may require as your needs advance.…

目录 . 漏洞的起因 . 漏洞原理分析 . 漏洞的影响范围 . 漏洞的利用场景 . 漏洞的POC.测试方法 . 漏洞的修复Patch情况 . 如何避免此类漏洞继续出现 1. 漏洞的起因 这次的CVE和windows的Secure Channel (Schannel)有关 The Secure Channel (Schannel) security package is a Security Support Provider (SSP) that implements the Secure Soc…

Parallel Performance Optimize Managed Code For Multi-Core Machines Daan Leijen and Judd Hall This article discusses: Task Parallel Library Parallel.For versus ThreadPool Static Work Distribution Futures This article uses the following technologies: P…

http://tools.android.com/tech-docs/instant-run N Developer Preview users: Instant Run is currently incompatible with the Jack toolchain. This new toolchain is required to use Java 8 language features supported by Android N. To learn more, read about…

The examples in this topic focus on the following Sync Framework types: FileSyncProvider FileSyncOptions FileSyncScopeFilter SyncOrchestrator SyncCallbacks Understanding File Synchronization   Sync Framework implements a synchronization provider that…

Developer deals with arrays every day. Being a collection, an important property to query is the number of items: Array.prototype.length. In JavaScript the length does not always indicate the number of existing elements (for sparse arrays) and modify…

本文转自:https://code.visualstudio.com/docs/languages/python Working with Python in Visual Studio Code, using the Microsoft Python extension, is simple, fun, and productive. The extension makes VS Code an excellent IDE, and works on any operating system…

转:http://www.sigvc.org/bbs/thread-72-1-1.html 一.特征提取Feature Extraction:   SIFT [1] [Demo program][SIFT Library] [VLFeat]   PCA-SIFT [2] [Project]   Affine-SIFT [3] [Project]   SURF [4] [OpenSURF] [Matlab Wrapper]   Affine Covariant Features [5] [Oxfo…

To perform object detection using ImageAI, all you need to do is Install Python on your computer system Install ImageAI and its dependencies 3. Download the Object Detection model file 4. Run the sample codes (which is as few as 10 lines) Now let’s g…

In this post, App Dev Manager Ed Tovsen spotlight the features and benefits of Code Maps in Visual Studio. Systems architects have long used modeling to design the structure, behavior, and interaction of systems within an organization. Modeling helps…

cd Documents cd PythonCode python3 hello.py Text Editor: Atom Atom 可以用来写 python 脚本 (文件后缀名 .py). 但是不用它也可以编写python程序., 然后用Terminal run the code.…

What is a code playground? Codepen, JSFiddle, JS Bin, Dabblet, CSS Deck, and Liveweave are HTML, CSS and JavaScript playgrounds, meaning that you can type in your HTML, CSS and JavaScript to troubleshoot, mess around with some code, or quickly write…

We will use npx to run a package using different versions of Node.js. This can become valuable when testing the various new features that are introduced in versions of Node.js. For example this code: let a = { one: , two: }; console.log( { ...a, thre…

PyCharm is a strong IDE for python programmer. Not only because it has a similar face with VS or some other IDEs, but also it provides a convenient way to remote manage codes. But... how to configure it to achieve this is a headache problem. Here I s…

1.1 实现一个算法,确定一个字符串的所有字符是否全都不同.不允许使用额外的数据结构. 解答:这里假定字符集为ASCII码,可以与面试官沟通确认字符串使用的字符集.由于字符集是有限的,建立一个数组模拟的Hash表记录每个字符是否出现,线性扫描一次字符串即可,复杂度O(len(s)).如果字符集较大,需要考虑空间开销,则可以用bitset来实现. bool isUnique(string s) { ]; memset(record, , sizeof(record)); size_t size =…

Improving Your Code with lint 1.See Also lint (reference) Using Android Annotations In addition to testing that your Android application meets its functional requirements, it's important to ensure that your code has no structural problems. Poorly str…

code::blocks很小,特别适合小型项目及家用旧电脑上MingW下编程,当然windows还是安装的Visual Studio办公用的,现把配置过程记录一遍. 1.在百度搜code::blocks到官网下载,地址为 https://www.fosshub.com/Code-Blocks.html?dwl=codeblocks-17.12-setup.exe 安装时候全选,网上也有详细安装步骤,这个是自带MingW编译器的.安装后打开Code::Blocks 2.下载glut,现在openg…

让你的vs code 跑在云服务器上 在B站上看到一个视频Run VS Code in the browser with massive computing resources(教你如何配置一个云IDE),视频里将vs Code部署在谷歌云上,这样就可以在任意的地方,使用浏览器在线编辑代码执行程序. 随后我自然是那我在腾讯云上的服务器进行了一番测试. 这是PC上的效果: 这是手机上的效果: 以下是准备阶段: 打开github地址:code-server 购买一台云服务器(腾讯云),2核4G 开始…

How to Improve Code Quality? Ref: https://www.perforce.com/blog/sca/what-code-quality-and-how-improve-it Measuring quality helps you understand where you’re at. After you’ve measured, you can take steps to improve overall quality. Here are four ways…

转载自:https://veerasundar.com/blog/2010/11/java-thread-local-how-to-use-and-code-sample/ Thread Local is an interesting and useful concept, yet most of the Java developers are not aware of how to use that. In this post, I’ll explain what is Thread Loca…

python程序运行中改变环境变量: Trying to change the way the loader works for a running Python is very tricky; probably OS/version dependent; may not work. One work-around that might help in some circumstances is to launch a sub-process that changes the environme…