dataquest review

the strong connected component and the-tarjan algorithm of the contraction point in the review of graph theoryby Rtpyh------------------------------------------------------------------------------------------------"strongly connected components and connected sub-graphs"#define #In a graph's sub-diagram, any two points can reach each other, that is, there is an interoperability path, then the sub-graph is a strong connected component. (if any two point

Recently ready to move, but also to review the basic knowledge. After a year, the front just contact with the Springboot can only be released first. Just review what you have listed.the elements in Set cannot be duplicated , So what is the way to distinguish between duplicates or not? is to use == or is equals ()? What difference do they have ? ? with contains to distinguish whether there are duplicate obj

1. Today basically class is to review the previous OHJob Joseph Ring, 30 people in a circle, starting from a person to count 1, the next number of 2, count to 9 on (^_^)/~~ bye, out, the next person continues to count 1 .... Ask the remaining 15 people to be Christians? The amount ... Wrong...... The rest of the 15 people are standing in a position. Use an array to solve the ... The initialization is 0, the outgoing is assigned a value of 1, the loop

A review of 1.php string functionsPHP Lookup function to locate the location where the string you are looking for appearsStrpos (string position) string Locator functionStrpos ($strA, $strB) is used to query the position of the string $strb in the string $str, which is strictly case-sensitive. Stripos () is the same as the above function, when one of the distinctions is that this method is case-insensitive;Strrpos () uses the same method as the above

stingy with beautiful ideas. As a full-time consultant, he seems to be willing to add some breadth to his lack of depth of work. "The fun of patterns" dabbled in almost all the fashionable topics in the Circle: code review/Design Review, James Coplien's commonalities/change point analysis, component technology, William Opdyke's PhD thesis, Martin Fowler's refactoring, XP ... Nature, in the most abbreviated

"Reprint" ILSVRC2016 Target Detection task review: Video target detection (VID) Reproduced from: http://geek.csdn.net/news/detail/133792The task of image target detection has made great progress in the past three years, and the detection performance has been greatly improved. But in the field of video surveillance, vehicle aided driving and so on, the target detection based on video has more extensive demand. Because of the problems of motion blur, oc

place to express, but if it is a bad experience, the user will need to find a place to vent, the evaluation of the entrance is used, which is why in the review review most of the complaints, but few praise, Even to close the evaluation function of departments such as government agencies, to avoid becoming a way of complaining, reporting, petitioning, but the domestic user is very easy to be encouraged, onl

Article Description: understand the Product review module. The comment module is very important for the electric business. In the world of E-commerce, the user is faced with a picture of a product, can not see touch, has been the buyer's comments on whether the user to buy the goods, plays a great role. How to design a good comment module, so that the evaluation can intuitively reflect the true quality of the goods, three-dimensional goods

Daily--SPRINGMVC system architecture and process Review of program apes Web development has been going on for a long time, and it's almost more than 10 years in the country. From the very beginning of the process level to the present MVC has undergone a lot of improvements and optimizations, this article mainly review the knowledge of spring MVC.Development History first stage CGI process response At this

Summary of the review of database principlesdatabase technology is the main research on how to organize and store data, efficient acquisition and processing of data, and can meet the needs of a variety of users of information technology, because the requirements of the database technology is very large, so learning this course of knowledge and technology is very necessary, should be skilled to understand, master Data , data management, database, data

Label:Database Review ④ June 15, 2016 21:34 Main Logical Data Model (LDM) logical 1. Three elements of the logical data model: Data Structure data structure Data Operation manipulation Data Constraints constraints 2. History of the relational model E.f.codd, a researcher of IBM company, proposed relational model in 1970 Proposed the Relational-algebra Propose relational algebra Defined the 1st, 2nd, and 3rd Normal Forms

Database Review ⑩June 19, 201613:40Main Transactions TransactionThe concept of 1.Transaction Concept transactionsA transaction is a unit of program execution that accesses and possibly updates various data items.A transaction is a unit of concurrency control and is a user-defined sequence of operations. These operations are either done or not, and are an inseparable unit of work. With transactions, SQL Server can bind a logically related set of operat

Label:Database Review ⑨ June 19, 2016 12:45 Main Database Programming 1. Introduction of Transact-SQL Transact-SQL is the language used by the application to interact with SQL Serverdbms. Transact-SQL = high-level programming language can apply Transact-SQL to database programming to realize data processing function Variables in the 2.transact-sql Local variables: A local variable is a user-defined variable whose scope is limited to the inside of the

Tags: varchar uniq review weight Zhang Mowgli add PNG code CREATE databaseAfter the cmd command to enter the database, you need to manually do some operations on the database Create a database plus a semicolon MySQL>Createdatabase myfirstdatabase; View the database you created plus s and semicolons MySQL>show Databases; Select the database plus semicolon to use MySQL> use myfirstdatabase; Create a database table plus a semicolon, and add character fo

Originally learned time, quite smooth, did not expect to use again, or encountered a lot of problems, resulting in the failure of the update, so, can only reconstruct the migration, so as not to look at the chaos.First, delete the migration, restore the data to the (a) End state1. Delete Folder2. Delete a table3. Delete Columns4. Comment out the newly added attributesSecond, re-operation EF6 in the original database using Codefirst Total review (secon

Tags: name login list Practice COM label Message Info user A bit with the original database in the use of codefirst far, but always review it, must be comprehensive point. One, insert two users in the user table (users) Second, generate the Post interface MVC generates a lot of interfaces and doesn't use Ajax, which is rarely used in real-world development, just for demonstration purposes. But no matter what the build, attributes, entity objects, etc

This is my second blog in 51, mainly to review my it career, first after graduation I engaged in ERP development, involving large enterprises of human resources management, logistics management, production management, finance and other fields, the front desk will make form, report. The background will write stored procedures and so on. In the software development process I participated in the whole process of software including: Demand research, summa

Disclaimer: This article is for the author to review the database course with a simple record of notes, if there are errors, please point out, thank you.First, the theoretical basis1. non-destructive connectivity (Lossless join): Set relationship mode R (u,f) is decomposed into several relational patterns R1 (U1,F1), R2 (U2,F2), ..., Rn (UN,FN), where u=u1u2 ... Un, and there is no Unuj, FI is the projection of F on the UJ, if R is equal to the result

Review database Connection pool: C3P0, DBCP1, the advantages of database connection pooling technology:• Resource reuse:Due to the reuse of database connections, there is a high performance overhead associated with frequent creation and release of connections. On the basis of reducing the system consumption, on the other hand, it also increases the stability of the system operating environment.• Faster system response Speed:Database connection pooling

"Cleanmymac" and run to clean up binary code, system cache, logs, language, garbage, garbage, etc. CLEANMYMAC also has device management, fast and permanent erase and extension manager, while allowing for custom appearance modifications. Currently, the clean My mac contains more than 50 features in maintenance, monitoring, cleaning, utilities and feedback categories.Cleanmymac and MacKeeperAny good "Cleanmymac" commentary will compare it to its biggest competitor, MacKeeper, and that's why I'm