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an operation object. The so-called 0 inputs indicate that the algorithm determines the initial conditions;4. Output) An algorithm has one or more outputs to reflect the results of input data processing. Algorithms without output are meaningless;5. Feasibility) Any computing step executed in an algorithm can be divided into basic executable operation steps, that is, each computing step can be completed within a limited time; (also known as validity) 　

PrefaceSliced ant Among the gregarious species, the leaf ants exhibit a highly complex behavior of the species. However, each ant individual in the community simply follows some simple rules of social interaction and chemical odor (i.e. pheromone) exchange. Wikipedia says: "The leaf ants form the largest and most complex animal society on earth after humans." "In fact, the leaf ants do not eat leaves, but instead use leaves to make a fungus that ser

people.There have been many people in the software design community who think that function is the most important, form must obey the function. Similarly, in architectural circles, one of the pioneers of modernist architecture, Louis Sullivan, also believes that form should be subject to function (forms follows function).Almost all software design concepts can find far more distant historical echoes in the

This article is mainly about why Apple launched iOS 5 in August 2011 to reject the Udid of the app acquisition device and the Udid replacement program, especially to remind developers that Apple App Store prohibits access to the Udid app shelves (recommended: app is Apple app Store rejected for n reasons), the following first to understand the next udid.What is U

Software applications are like icebergs. Users see only part of the application--in most cases--most of the applications are invisible. This is an elusive and mysterious "back end." In the Web development chapter, we discuss Web development primarily because it involves direct interaction with end users-what we can call "front-end Web development." In most applications, the non-user interface code

This may be a deep topic. What is Asynchronization? In general, asynchronous execution is delayed in javascript. Strictly speaking, the asynchronous programming capabilities in javascript are provided by BOM and DOM, such as setTimeout, XMLHttpRequest, DOM event mechanism, newly added webwork and postMessage in html5. These things share a common feature: they hav

"disease", resulting in a low retention rate. Homogeneous competition Because of the low development threshold and the saturation of the entire app market, homogeneous applications are flooding the market. And the homogeneity of one of the biggest reasons is that at present, a lot of app development, positioning is not clear, the need for confusion, can be summed up as the following "illness." Forum

immutable, but the message may be variable, separating the easily changing message from the logic that is not easily changed. 3. Separation of mechanism and strategy. Like the 2nd, many places in this book refer to mechanisms and strategies. In the example above, my understanding is that the mechanism is the processing logic of the message, and the strategy

noticeable as the screen grows larger and more diverse.But it doesn't make any sense to dwell on "no gaps", "function and content cannot be separated." There are some usability principles and there is no room for challenge. It's like the doors in public places have to be opened outward. 9. For this issue, designers should consider more beneficial ways for users. Rather than listening to users say what the

What is the difference between compilation and interpretation? The compiler compiles every statement of the source program into machine language and saves it as a binary file, so that the computer can run the program directly in machine language, which is very fast. And the interpreter is only in the execution of the

Shuttleworth is serious about Ubuntu's development goals at Ubuntu's first release, don't forget that the first version of Ubuntu is codenamed "warty warthog"(a lump of wart pig), any new company in the release of its products are not molded in their products have such a nickname. These seemingly comical, foolish, strange naming habits have continued to this day (the newly released version

site few. But we want to enhance the weight of the site, we later an important means is to promote the brand of our website, improve the user community, more important is the performance in the key role in the right to fall. If your site has a lot of fixed user groups, and the habit of using search engines to find your site, this time

mobile phone system. We should work together and develop it together. Why do we need to fight in the dark? What are the contradictions that cause the Linux Kernel team to remove Android code? Greg Kroah-Harman wrote a detailed article explaining this decision. Let's take a look at what he said and what kind of system Android