Source: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescriptionThere is a small reimbursement system, it has the following functions:(1) Statistics of the total amount of invoices submitted by each person(2) Statistics of total amount of each type of invoicesimplify the system to the follow
Source: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescriptionThe Beetle's "a Day" and "Tomorrow Never Knows" are popular, if you tell you A day in the life, will it really be tomorrow never knows? believe that after learning this is not a problem, and now come to realize it 。Reads a date
Programming Question # # #: Finding the greatest point on a planeSource: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescribeIn a plane, if there are two points (x, y), (A, B), if (x, y) is dominant (a, B), this refers to the x>=a,y>=b;Graphically, A (a, b) is located in an infinite area (x
Programming Question #: pairing the base chainSource: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescribeDNA (DNA) is made up of two complementary base chains that are combined in a two-helix manner. There were 4 bases of DNA, namely, adenosine (A), guanine (G), Thymic pyrimidine (T) and c
Programming Question #: operator determinationSource: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescribeAfter two integers a and b are calculated, the result is C. Expressed as: a? b = C, where,? may be addition +, subtraction-, multiplication *, divisible/or residual%. Determine the oper
Programming Question #: Number 2nd in a stringSource: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescribeEnter a string of no more than 500 symbols, the output appears in the string of the 2nd more English letters (uppercase and lowercase letters are considered the same) and the number of
Programming Question # #: Calculating the sum of the edge elements of matricesSource: POJ (Coursera statement: The exercises completed on POJ will not count against the final results of Coursera. )Note: Total time limit: 1000ms memory limit: 65536kBDescribeEnter an integer matrix to calculate the sum of the elements at the edge of the matrix. The elements of the so-called Matrix Edge are the elements of the
My project needs to import the crawled Coursera data into the database for future work, such as PHPNow that the data has been crawled, the format exists in the folder, the picture belongs to a directory, I am a data rookie, do not know how to design a database to the correct existence of the data in MySQL? (using navicat), I hope you master Liberal enlighten, younger brother grateful!
Reply content:
My project needs to import the crawled
I have climbed the URL of all the courses on Coursera and placed it in the All_url.txt file, about 2000 lines.
Then I want to use these URLs to crawl other information I want, to synthesize a. csv to facilitate the import of the database.
In the following code, I've only written a few things I want to crawl to test for implementation (such as the crawl of the course schedule, and so on, five of the information I need is not written in the code), but a
the rest planned to be migrated.
* In addition, wattzon has publicly announced that its entire platform has been written based on Scala infrastructure.
* The UBS Group uses Scala for general products.
* Coursera (famous educational video website) uses Scala as a server language.
Main features:
* Object-Oriented Programming: Scala is a pure object-oriented language. Every value is an object. Object Data Type and BehaviorClassAndCharacteristicsDescri
Academy
Khan Academy, one of the earliest free online coding resources, has been accompanied by many students for a long journey. The simple learning course section and the video tutorials are gradually deepened. It is very responsible to say that, khan Academy is a great place to help you start programming.
4. HTML5 Rocks
HTML5 Rocks is a Google Project. Under the guidance of Google's professional contributors, you can see the latest news, resource navigation, and all slides related to HTML5.
long journey. The simple learning course section and the video tutorials are gradually deepened. It is very responsible to say that, khan Academy is a great place to help you start programming.
4. HTML5 rocks
HTML5 rocks is a Google Project. Under the guidance of Google's professional contributors, you can see the latest news, resource navigation, and all slides related to HTML5. The status of HTML5 is constantly rising. As long as you have a little experience, this language is very suitable f
I posted my microblog two days ago, but Wu lide from Fudan Institute of Computer Science is running? The elements of statistical learning )? This course is still in Zhangjiang... how can I miss Daniel's class? I'm sure I have to ask for leave to join the class... in order to reduce the psychological pressure, I also pulled a bunch of colleagues to listen to it. A dozen of eBay's mighty people killed the past! We always feel that we have more than Fudan students, and the classrooms of 50 or 60 pe
The topic of machine learning techniques under this column (machine learning) is a personal learning experience and notes on the Machine Learning Techniques (2015) of Coursera public course. All the content is from Coursera public class machine learning techniques Hsuan-tien Lin Heights field Teacher's explanation. (https://class.coursera.org/ntumltwo-001/lecture)1th talk-------Linear support Vector Machine
! = "Object" typeof descriptor! = "Function") | descriptor === null ){Throw new TypeError (ERR_NON_OBJECT_DESCRIPTOR + descriptor );}// Make a valiant attempt to use the real defineProperty// For I8's DOM elements.If (definePropertyFallback ){Try {Return definePropertyFallback. call (Object, object, property, descriptor );} Catch (exception ){// Try the shim if the real one doesn't work}}
// If it's a data property.If (owns (descriptor, "value ")){//
) {
Try the shim if the real one doesn ' t work
}
}
If it ' s a data property.
if (Owns (descriptor, "value")) {
Fail silently if "writable", "enumerable", or "configurable"
are requested but not supported
/*
Alternate approach:
if (//can ' t implement features allow false but not true
! (Owns (descriptor, "writable")? descriptor.writable:true) | |
! (Owns
, and the configuration file is often carried out 2 coding, and even the results are 2-encoded, such as Doc, you need to use the Microsoft API to complete the modification. )
Because it is so simple to modify a text file, the Linux system itself must be regulated. This leads to the 2 concepts of users (groups) and permissions.
The introduction of these 2 concepts is a perfect guarantee for Linux security without adding complexity. Because everything is a document. So Linux introduced 2 files to
InitializeCriticalSection again. Precautions :1. The critical section allows only one thread to access at a time, and each thread must call the critical zone flag (that is, a critical_section global variable) before attempting to manipulate the critical zone data entercriticalsection. Other threads that want access are put to sleep, and the system stops allocating CPU time slices to them until they are awakened. In other words, a critical section can be owned by only one thread, and of course,
Critical sectionCritical section (critical section) is used to achieve "exclusive possession". Scope of application is a single processBetween the threads. It is:A local object, not a core object.Fast and efficient.Not be able to have more than one critical section at the same time being waited.Unable to detect whether a thread has been discarded.You can implement mutual exclusion between threads and cannot be used to implement synchronization.SemaphoreSemaphore is used to track limited resource
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