roomba tips

A few tips before java programming, and a few tips for java programming 1. First, let's look at the meanings of the abbreviations. JavaSE Standard Edition Java EE Enterprise Edition javaME Micro Edition Sdk: soft developement kit, a development kit, including jdk: java developement kit jre: java runtime environment jvm: java Virtual Machine 2. Install jdk with jre. Install jre to run jvm. 3. When configurin

Some useful tips/small formulas/Xuan Xue optimization (fog, tips/Xuan Xue) 1. There are gcd (x1-x2, y1-y2)-1 points on the line segment (excluding the endpoint) consisting of (x1, y1) (x2, y2. 2. After two longlong values are multiplied, % of a number can be used in the following ways to avoid high precision: Ll mu (ll a, ll B) {ll r = 0; for (; B; a = (a 3. $ \ sum \ limits _ {I = 1} ^ n I ^ 2 = \

Python tips (keep updated) and python tips 1. view the class attributes and methods of import/export warehouse Python is a little inconvenient. Unlike C ++, when a type is specified, a "." error is prompted for the method or attribute it contains. Previously, it was solved by checking the official documents corresponding to the database. This time I found a new method help, which can list methods and attrib

SQL tips: WHERE 1 = 1, SQL tips Due to project requirements, you need to manually splice SQL statements (do not know what leaders think ......), And then return to the original age, append (SQL ). However, the subsequent query involves multiple dynamic conditions. if mybatis Is, You can directly splice dynamic SQL statements with the Later, a friend told me a way to easily solve this problem, that is, d

A few Ruby tips and Ruby tips Sequential call of code blocksCopy codeThe Code is as follows:Def touch_downYield [3, 7]Puts "touchdown! "EndTouch_down do | (first_down, second_down) |Puts "# {first_down} yards on the run"Puts "# {second_down} yards passed"End=> "3 yards on the run"=> "7 yards passed"=> "Touchdown! " It mainly refers to the use of array in block Retrieve elements from arrayCopy codeThe Code i

the API interface. In fact, many of the Java API is relative, in this way to learn, and soon you will find that you know a lot.public class stringtest{public static void Main (string[] args) { StringBuilder sb = new StringBuilder (); for (int i = 0; I 　　The above is just a small knowledge of my skills to tell you that in the study should learn more extrapolate, Master learning method is you learn programming a shortcut. You are welcome to have a better learning method, learning

tagDocument.stylesheets[0].rules[0]When you prevent clicking on an empty link, the page is often reset to the top end of the page.Previous page SourceAsp:Request.ServerVariables ("Http_referer")Javascript:Document.referrerFreeing memoryCollectGarbage ();Disable Right-clickDocument.oncontextmenu = function () {return false;}Prohibit saveDisable selection of Prohibit pasteAddress bar iconFavicon.ico name Best not change 16*16 16 colors, put the virtual directory under the root directoryFavorites

Programming tips: four tips for making C language efficient-general Linux technology-Linux programming and kernel information. For details, see the following. Writing efficient and concise C language code is the goal pursued by many software engineers. This article describes some experiences and experiences in programming. First move: Change Time with Space The biggest contradiction in computer programs i

Css background image tips and pitfalls, css background image tips Background Image settings of the body First: In this case, the background image can be scaled but not completely proportional. Background: url (imgs/1.jpg) no-repeat; Background-position: center 0; Positioning origin of the background image, due to the high body uncertainty Background-attachment: fixed; the background image remains fixed and

Some tips-refactoring, tips-refactoring Use box-shadow to create relief effects Simple background modification using box-shadow Insufficient background image for long pages ...... 01 UseBox-shadowManufacturing embossed Effect Demo example: The sample html structure: Css: .box { position: relative; border-radius: rem(40px); overflow: hidden; box-shadow: rem(4px) rem(14px) rem(23px

CSS style setting tips and css style tips In-Row Element center setting: If the set element is a text, image, or other in-Row ElementParent ElementSettext-align:center. The sample code is as follows: HTML code Centered setting of fixed width block elements: the elements that meet the conditions of fixed width and block can be centered by setting the "Left and right margin" value to "auto. The sample code i

+, winphone8+================== ========================================== */.flex{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox ;d Isplay:flex;}. Flex-v{-webkit-box-orient:vertical;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction: Column;}. Flex-1{-webkit-box-flex:1;-webkit-flex:1;-ms-flex:1;flex:1;}. Flex-align-center{-webkit-box-align:center;-webkit-align-items:center;-ms-flex-align:center;align-items:center ;}. Flex-pack-center{-webkit-box-pack:center;-we

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Git should save more developers ' jobs than other technologies. As long as you often use Git to save your work, you'll always have the opportunity to return the code to the previous state, so you can undo the mistakes you made in the middle of the night. In spite of that, Git's command-line interface is a tricky one to grasp. Next, give you 7 tips to maximize the role of Git. Typically, most of the time we use only add, commit, Branch, and Push/pull

attention.His works are short, gorgeous costumes, beautiful music, dialogue humorous, sophisticated ideas. Today, scientific and technological innovation and rapid development of civilization, however, now the audience, still have no patience, just as the audience in Shakespeare's time. A few tips for building focus Attention is a very abstract noun, and capture attention is like "Tiger Eat Day" like, no way, like other media, users browsing web

Tags: SQL development data rem BST concat statements Col Mon create First, the ranks of the conversion Basic ideas: 1. Conversion of data into tender data, 　　　　　　 2. Use Cartesian product for row and column conversion Selectsum ( Case whenChildr='Dining' Then Money End) as 'Dining', SUM ( Case whenChildr='Communication' Then Money End) as 'Communication', SUM ( Case whenChildr='Entertainment' Then Money End) as 'Entertainment' from (SelectChildr,Convert(sum( Money),decimal(Ten,2)

Numpy usage tips: array filtering instance code, numpy usage tips This article focuses on the array filtering related to numpy usage techniques, as detailed below. When Boolean array B is used as the subscript to access elements in array x, all elements in array x corresponding to the subscript True in array B are collected. The array obtained using a Boolean array as the subscript does not share data space

17 tips for Python and 17 tips for Python 1. Exchange Variables Copy codeThe Code is as follows:X = 6Y = 5 X, y = y, x Print x>>> 5Print y>>> 6 2. The if statement is in the row Copy codeThe Code is as follows:Print "Hello" if True else "World">>> Hello 3. Connection The last method below looks cool when binding two different types of objects. Copy codeThe Code is as follows:Nfc = ["Packers", "49ers"]Afc =

Tips and notes for using mysql indexes, and tips for using mysql Indexes I. Functions of Indexes In general application systems, the read/write ratio is around, and insert operations and general update operations rarely encounter performance problems. The most common problems are also the most common problems. They are also complicated query operations, therefore, the optimization of query statements is obv

Smart tips for NhibernateNhibernate.dll on the following pathC:\Program Files (x86) \reference Assemblies\microsoft\framework\. Netframework\v4.0\profile\clientNhibernate.xml on the following pathC:\Program Files (x86) \reference Assemblies\microsoft\framework\. Netframework\v4.0\profile\client\zh-hansThis two folder is actually a hint file for. NET class libraries and class librariesNot just nhibernate, but other class library files are the same.Nhib