coursera optimization

Topic 1: Minimum spanning tree three • Prim algorithm time limit for heap optimization:10000msSingle Point time limit:1000msMemory Limit:256MBDescribeBack two weeks ago, after the successful use of the kruscal algorithm to solve the problem, small Ho produced a question, on the sparse graph of such an algorithm than prim optimization where?Tip: No reason to optimize! InputEach test point (input file) has an

Database optimization and SQL optimization summary, SQL optimization SummaryDatabase Optimization Methods1. select the most suitable field attribute MySQL can support access to large data volumes, but generally, the smaller the table in the database, the faster the query will be executed on it. Therefore, when creating

Mysql Database SQL Optimization-subquery optimization and mysql Database SQL Optimization1. What are subqueries and table join queries:Subquery: The select statement is used in the select or where clause of the primary SQL statement; select. name, (select B. name from B where B. id =. id) from a where. name lik 'a %'Table join query: a joint query of multiple tables; select. name, B. name from a, B where. i

2 Index and Query Optimization Index type Ø normal index: This is the most basic index type and has no restrictions such as uniqueness. Ø unique index: It is basically the same as a normal index, but all index column values are unique. Ø primary key: The primary key is a unique index, but must be specified as "primary key ". Ø full-text indexing: MYSQL supports full-text indexing and full-text retrieval from 3.23.23. In MYSQL, the full-text index type

Texture Optimization in Cocos2d-x optimization, cocos2d-x optimization texture1. Texture pixel formatAnother important indicator of texture optimization is the texture pixel format. To maximize the user's fidelity requirements, select the appropriate pixel format, this greatly improves the processing speed of textures.

Performance Optimization-database optimization and performance optimization database This article optimizes the performance of databases. The principle applies to most databases, including Sqlite, Mysql, Oracle, and SQL server,The index (advantages and disadvantages, categories, scenarios, rules) and transactions are introduced in detail. Finally, some optimizati

As we all know, the new station on-line, especially in the face of Baidu SEO optimization, many times we seem very powerless, because Baidu for the new station of the examination cycle is very long, the content quality is better than at least 1 months, the content of low quality three months may not enter the top 100, So I think the optimization Baidu must follow its relevant rules, the author recently opti

result set type returned by the subquery is a simple value. b) Single-row sub-query. The result set type returned by the subquery is 0 or one unit group. Similar to the scalar subquery, but may return 0 tuples. c) Multiline single-row subquery. The result set type returned by a subquery is a multi-tuple but has only one simple column. d) Table sub-query. The result set type returned by a subquery is a tabl

modification. In addition, SQL server limits the number of indexes and the length of indexes. For more information, see 5) re-indexing as necessaryAfter running SQL server for a period of time, some index fragments will be formed. At this time, indexes need to be re-built. Sometimes re-indexing can have unexpected results. View the index fragmentation and re-create the index. You can use the SQL server Manager to re-create the index, or use the following SQL statement: -- Displays the index fra

, distance distance, large map2. Scene: More style changes3, many people with screen4, there are many interactions(see here, UE + The above is directly said Fortress night is good Bai)(because of the length of the road, the path is opened directly, you crossing)Memory 2 Texturestreaming The UV scale factor of the corresponding map used in the screen size x material of the object bounds on the CPU x a scalar value that can be tweak by the fine art

IOS25 performance optimization, memory optimization, and ios25 Performance Optimization 1. Use ARC to manage memory ARC (Automatic ReferenceCounting, Automatic reference counting) and iOS5 are released together to avoid Memory leakage, which is often caused by memory loss. It automatically manages retain and release processes for you, so you don't have to interve

Android Optimization-UI optimization (2), android ui OptimizationUseincludeTag reuse Layout-1.includeFunctions of tags What should I do if I use this layout on many interfaces? If every page is written, the code is too redundant and the maintenance difficulty increases. I will use this layout aboveincludeLabels, code is obviously more neat, and the layout is more reusable, reducing the memory usag

Android Optimization-UI optimization (1), android ui OptimizationOptimize layout level 1. Avoid layout mosaic depth (as shown below) We can remove the id as follows:main_ll_duoyuThe LinearLayout of can also achieve the desired effect (the effect is as follows) 2. Use tools to view the Layout Tool Path Sdk \ tools \ hierarchyviewer. bat | double-click to open View Layout Comparison Now we

fragmentation and re-create the index. You can use the SQL server Manager to re-create the index, or use the following SQL statement:Copy codeThe Code is as follows:-- Displays the index fragmentation of the testIndexOrder table.Dbcc showcontig (testIndexOrder)-- Re-create the index of the table-- The first parameter can be the table name or table ID.-- The second parameter. If it is '', it indicates that all indexes of the table are affected.-- The third parameter is the fill factor, that is,

1)group by group conversion (MySQL not supported ) ① group Operation Move Down GROUPBY operations may significantly reduce the number of relationship tuples, and if a relationship can be grouped before a connection between tables, it is likely to increase the efficiency of the connection. This optimization is done in advance of the grouping operation. The meaning of the move Down is that in the query tree, the grouping operatio

The author has done some optimization work in the iOS development process, has some superficial understanding to the iOS performance optimization, has been wanting to own these experiences, summarizes briefly.As the first of the series, I intend to summarize some of the general principles of iOS optimization. Because I think whether the list smoothness

You can access the Google drive containing all of the current and in-progress lecture slides for this course through the L Ink below. Lecture Slides You could find it helpful to either bookmark this page or download the slides for easy

You can access the Google drive containing all of the current and in-progress lecture slides for this course through the L Ink below. Lecture Slides You could find it helpful to either bookmark this page or download the slides for easy

This section describes the core of machine learning, the fundamental problem-the feasibility of learning. As we all know about machine learning, the ability to measure whether a machine learning algorithm is learning is not how the model behaves on

Extremely light of a semester finally passed, summer vacation intends to learn the big step down this machine learning techniques.The first lesson is the introduction of SVM, although I have learned it before, but I heard a feeling is very rewarding.