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Title Description: A n*n matrix is given, which is required to find the largest and most sub-matrices.For example:Such a matrix, the maximum sub-matrix of the and is 15;This problem can be reminiscent of the maximum contiguous subarray, and the maximum subarray is http://www.cnblogs.com/tz346125264/p/7560708.html in the previous article.Analysis: The maximal sub-

Tags: blog http java using OS IO file dataThis article reproduced: http://www.cnblogs.com/olartan/archive/2009/12/02/1615131.htmlChapter 1th IntroductionWhen the amount of data is large, the multiple tables are divided into different db first, then the data is distributed to different databases according to the key columns. After the library distribution, the system query, IO and other operations can have a group of multiple machines together to complete. This article is mainly aimed at, the mas

MysqlWhy divide a table into a libraryCan be used to say where the MySQL, as long as the amount of data a large, immediately encounter a problem, to be divided into the database table. Why do you want to divide the table with a question? Can't mysql handle big tables? In fact, it is a large table that can be processed. I have experienced projects in which the single table physical file size is more than 80G, the number of single-table records is more than 500 million, and this table belongs to a

Label:Table is a good way to distribute the pressure of the database.Table, the most straightforward meaning, is to divide a table structure into multiple tables, and then, can be in the same library, can also be placed in different libraries.Of course, the first thing you need to know is how to divide the table. Individuals think that the number of single-table records to reach the million to tens the use of the table.Classification of sub-tables: 1.

1. Install the UBUNTU14, enter the desktop, ctrl+alt+t into the terminal.To get root privileges:$sudo passwd RootEnter password(Note: The input does not appear as it does under Windows, although the input is OK.) Check whether the NumLock light is on or off, press, and digital input)Set PasswordConfirm PasswordUpdated successfully?$su//Get root permission to display "[Email protected]:home/mrwang#"? Note that this is the last # number.or $su root.or Su-root pay attention to the difference oh.2.

the article information in the 1~10000 into the article table in DB1, user_id all the article information in 10001~20000 into the DB2 table, and so on, until article. In this way, the article data is naturally divided into various databases, to achieve the purpose of data segmentation.The next problem to solve is how to find a specific database? In fact, the problem is simple and obvious, since the Sub-Library when we use the distinction between the

the article information in the 1~10000 into the article table in DB1, user_id all the article information in 10001~20000 into the DB2 table, and so on, until article. In this way, the article data is naturally divided into various databases, to achieve the purpose of data segmentation.The next problem to solve is how to find a specific database? In fact, the problem is simple and obvious, since the Sub-Library when we use the distinction between the

such data to tables in different databases? We can do this by putting user_id all the article information in the 1~10000 into the article table in DB1, user_id all the article information in 10001~20000 into the DB2 table, and so on, until article. In this way, the article data is naturally divided into various databases, to achieve the purpose of data segmentation. The next problem to solve is how to find a specific database? In fact, the problem is simple and obvious, since the

Label:Why do you want to divide tables First of all to know what the situation, only need to divide the table of individuals feel that the number of single-table records to the million to tens to use the sub-table, the purpose of the table is this, reduce the burden of the database, shorten the query time. There are two ways of table partitioning: 1 Horizontal split: Places data rows into two separate tables based on the values of one or more columns

The maximum and sub-arrays are the array and the largest subarray, aka the largest and the subsequence. A subarray is a contiguous n-element in an array, such as A2,A3,A4, which is a 3-length sub-array. As the name implies, the maximum and sub-arrays are required and the largest sub-array.　　An array of n elements conta

CentOS learning notes-vi program editor, centos learning notes-viVi program editor In Linux, you often need to modify some configuration files. In this case, you need an editor. Almost all Linux versions provide the vi editor.File Content Check cat command What should we do if we want to check the content of a file? There are quite a few interesting commands to share: the most commonly used commands for dis

Linux Study Notes (4)-Use of the text editor vi and Study Notes vi Three editing modes of vi Command mode)In this mode, you can control the movement of the cursor, delete characters, delete rows, and copy and move a paragraph. Insert mode)Only in this mode can you enter characters Last line mode)In this mode, you can save the file or exit

The traditional sub-database sub-tableThe traditional sub-database is implemented by Application layer logic, which is common tables and libraries for the database level.Sub-LibraryWhy the library is dividedFirst, in the case of a single database server with sufficient performance, the library has no effect on database performance. Database has only one namespace

Maximum sub-sequence and algorithm analysis, sub-sequence algorithm analysis Problem Description: Given n integer sequence {a1,a2,..., an}, function f (i,j) =max{0,σak} (k: Continuous from I to j); The problem is the maximum value of the continuous sub-columns, if the maximum is negative, take 0, such as 8 number sequence { -1,2,-3,4,-2,5, -8,3}, the maximum sub

In. in the discuz project of net, the background management module is discuze. web. admin is a separate module. However, the folder for opening the solution cannot find the folder for separate modules, but is stored in discuz. in the admin folder of the web project. After analysis, the original administrator module is a sub-website, just to build the website in the discuz. web folder, and finally, include the discuz. Web project. What are the advant

Problem description: An array with a length of N. the array elements have positive values, such as {-1, 4, 6,-3, 7,-3,-3, 9 }; we can clearly know that the largest sub-array should be 4 to 9, that is, subscript 1 to subscript 7, and the sum is 17.Solution: the first method: We can use Definition 1 and two numbers ThisSum and MaxSum to record the sum of the current array and the largest sum of the array. 2. We can use two for loops to traverse the arra

There are many ways: Exit VI When you are finished editing a file, you are ready to exit VI when you return to the shell, you can use one of the following methods. In command mode, even press two Capitals Z, if the currently edited file has been modified, vi save the file exit, return to the shell, if the current edited file has not been modified, then

The sub-database, as the name implies, is stored in a library of a table of data chunked stored in multiple libraries on several tables. For large-scale Internet applications, when the amount of data in a single table reaches tens of millions, the database spends more time per query, and the database faces very high concurrent accesses. through the Sub-database table, so that the data evenly distributed acr

For large-scale Internet applications, the amount of data in a single table can reach tens of millions or even billions of dollars, while facing this high level of concurrency pressure. Master-slave structure can only extend the read ability of the database, write operation or centralized in master, Master does not have the unrestricted hook slave Library, if need to further expand the throughput capacity of the database, you can consider the strategy of using the

When designing the parent object, you will encounter the situation where the parameter of the object method is the class itself, and then the sub-object will implement this method, for example, compare whether the object is equal. In this scenario, it is usually designed to write the following example, first performing transformation and comparison in the sub-object. This is a design that can work normally