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Fastjson meet the problem or project to optimize the problem, see source code can be solved

operation, because the Jsonarray default underlying use of ArrayList storage, so there is a performance problem, So is it possible to use LinkedList? The answer can be:Jsonarray arr = new Jsonarray (new LinkedList ());  3: Can we replace the underlying stored ArrayList with LinkedList when we query the interface to get a jsonarray string to deserialize? Answer: Yes, modify the source code or add an overloaded method.public static Jsonarray Parsearray

Hang electric OJ question 1393 Weird clock problem report _ACM problem report

Weird Clock time limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) Total submission (s): 1771 accepted submission (s): 643 Problem Description a weird clock marked from 0 to the has only a minute hand. It won ' t move until a special coin are thrown into its box. There are different kinds of coins as your options. However Once you do your choice, you cannot use the any other kind. There are infinite number of coins of each

Solve the garbled problem of Ubuntu uncompressed Windows generated zip files by __ garbled problem

Reference URL: http://forum.ubuntu.org.cn/viewtopic.php?t=175405 Files that are compressed on windows are compressed by the system's default encoding Chinese. Because the zip file does not declare its code, so Linux unzip generally with the default encoding decompression, Chinese file name will appear garbled.Although it was reported as a bug in 2005, Info-zip's official website did not include the automatic Identification code, which may not be considered a

BYTE order problem--size end problem

byte order problem--The small End method Turn from: http://blog.csdn.net/sunjiajiang/article/details/7163338Category: ARM 2011-12-29 21:21 2003 people read Comments (2) Collection report Definition of a byte order byte order, as the name implies byte order, say two more words is greater than a byte type of data in the memory of the order (a byte of the data of course there is no need to talk about the order of the

How to troubleshoot the refresh button problem in asp.net and the SQL injection problem in the URL.

asp.net| Button | solve | refresh | problem All along, asp,php the processing of submitting data to another page, because it takes a lot of effort to deal with the decision in the page. This makes it possible to implement a small function with a lot of files, while benefiting from repeated submissions when submitting forms or deleting data.The introduction of ASP.net makes this issue a reverse change, asp.net events and event delegates, the program ca

How to troubleshoot the refresh button problem in asp.net and the SQL injection problem in the URL

asp.net| Button | solve | refresh | Problem all the time, asp,php to process submitting data to another page, because it takes a lot of effort to handle the decision on this page. This makes it possible to implement a small function with a lot of files, while benefiting from repeated submissions when submitting forms or deleting data. The introduction of ASP.net makes this issue a reverse change, asp.net events and event delegates, the program can eas

0-1 algorithm Problem of knapsack problem thought

not on the line?! "When ~ ~ ~" Vegetable worm: (hand holds eight centimeters diameter wok, tendon) ... Are you an idiot?-_-## (we're going to have to keep the guards.) How many tables do we have, three missing ones? Input The first line of a positive integer N (1 Output The sum of the greatest "likes". Ideas for solving problems My first reaction was to backtrack and then tle--| | | In fact, this is a very typical 0-1 knapsack problem, and t

The design problem from the problem of the precision of floating point numbers

This article by Ruby-china a post "by the decimal point of precision problem lead to design problems" lead, the post is also my hair, in view of the reply when learned a lot of content, have a little sentiment, so want to sum up. First declare the programming language selected in this article is Ruby and the operating environment is Ubuntu. In the preparation of finance, E-commerce and other applications, often encounter decimals, decimal multiplica

[Problem] Database MySQL and navicat garbled problem

The characters stored in the computer need to use the encoding set, early ASCII set, but with the development of technology, the ASCII set can not meet the requirements, there are more and more characters, such as Chinese character. Later developed the Unicode, GB2312, UTF8 and other character sets. After the character set, the problem arises, if the runtime environment and the corresponding use of the character set is not the same as garbled or "? "A

Problem simulation and problem analysis of library cache pin in Oracle Single instance case

Problem simulation and problem analysis of library cache pin in Oracle Single instance caseReference from:Waitevent: "Library cache Pin" Reference Note (document ID 34579.1)How do I Find the blocker of the ' Library cache pin ' in a RAC environment? (Document ID 780514.1)Native environment: Oracle 10.2.0.5 x86-64bit for RHEL5.8 x86-64bitFirst session:[[emailprotected] ~]$ sqlplus/as sysdbasql*plus:release 1

About the problem of Android hibernation re-connected, problem solved another Xie!!

==================== Problem Description ====================Android CPU hibernation lock has been obtained in the case of mobile phone app network long connection, when the screen went down to meet the network anomaly, the app needs to reconnect the server, but as long as the screen turned black the app will not do anything. The light screen app immediately performs a re-connect. Who knows add me qq:2974239258, p

Visual Studio 2017 Installation failed. Do you have such a problem? How to solve this problem, studio2017

Visual Studio 2017 Installation failed. Do you have such a problem? How to solve this problem, studio2017 The listed workload and components cannot be installed due to one or more package faults. Incomplete workloadMobile development using JavaScript (Microsoft. VisualStudio. Workload. WebCrossPlat, version = 15.0.26208.0) Incomplete ComponentsCordova 6.3.1 tool set (Component. CordovaToolset.6.3.1, version

HDU 5832 A water problem (a water problem)

HDU 5832A Water Problem(a water problem)Time Limit: 5 000/ - xx MS (java/others) Memory limit:65536/65536 K (java/others)Problem Description-Topic descriptionThe planets named Haha and Xixi in the universe and they were created with the universe beginning.There is the year of Xixi A and 137 days in Haha a. Now your know the day N after Big Bang, you need to answ

[Mysql] Select not, insert error problem, field encoding problem

The Mysql 5.5 table structure is: CREATE TABLE `account` ( `name` varchar(20) NOT NULL, PRIMARY KEY (`name`)) ENGINE=InnoDB DEFAULT CHARSET=gbk; nameThe current encoding of the field: CharacterSet:gbkCollation:gbk_chinese_ci At the moment my program logic is: First of all: select * from `account` where `name`=? If NULL is returned, the name is inserted: insert into `account` (`name`) values(?) Now in my background there are several error records: Com.mysql.jdbc.exceptions.MySQLIntegrity

Nyoj 216 A problem is easy "math problem"

Just a little bit of simplicity.A problem is easy time limit: +Ms | Memory Limit:65535KB Difficulty:3 Describe When Teddy is a child, he is always thinking on some simple math problems, such as "what it ' s 1 cup of water plus 1 Pile of dough., "Yuan buy pig". etc.. One day Teddy met a-a-man-in-his-dream, in-Dream the man whose name is "Rulai" gave Teddy a problem:

HDU2101 A + B problem Too "water problem"

A + B problem TooTime limit:3000/1000 MS (java/others) Memory limit:32768/32768 K (java/others) total submission (s): 12745 Accepted Submission (s): 9499Problem DescriptionThis problem was also a + B problem,but it has a little difference,you should determine does (A+B) could being divided with 86.For example, if (a+b) =98,you should output no for result.InputEac

An IFRAME implementation of long polling, through PHP query database and JS Update page content of the program, the problem is not every MySQL insert message can be displayed to the page, ask to help analyze where there is a problem

This post was last edited by stneo1990 on 2013-08-08 11:45:06 First of all, this is a real-time customer service consulting system, the main purpose is to simulate the foreground user sent messages (through the manual insert into the MySQL database implementation) by the server real-time push to the front desk customer Service page, the approximate structure is as follows: 1, in the foreground kefu.html page has an IFRAME, this IFRAME request background query.php Query program (IFRAME hidden on

Hihocoder 1430:a boring problem (a complex problem)

Hihocoder #1430: A boring problem (a complex topic) time limit: 1000ms single point time limit: 1000ms memory Limit: 256MBDescription-topic description as a student of the School of Electronics Engineering and computer science in Peking Un Iversity, Kyle took the course named Advanced Algebra in his freshman year, which, Unluckily, became he nightmare. His teacher, Mr. X, have an approximately paranoid requirements in the ability of calculation, fro

Socket solves the problem of sticking packets. 1. socket solves the problem of sticking packets.

Socket solves the problem of sticking packets. 1. socket solves the problem of sticking packets. A sticky Package refers to the phenomenon that the sender sends packets too quickly and sends multiple packets to the receiver end to form a package. For example, the sender sends one character 'a' for 10 consecutive times ', because the sending speed is very fast, the receiving end may receive 10 characters 'aa

Uva oj 101-the blocks problem (block problem)

Time Limit: 3.000 secondTime Limit: 3.000 seconds Background Background Using areas of computer science use simple, abstract domains for both analytical and empirical studies. for example, an early AI Study of planning and Robotics (strips) used a block world in which a robot arm timed med tasks involving the manipulation of blocks.Simple and abstract methods are used in many aspects of computer science for analysis and experimental research. For example, in the early days of planning and

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