Programmer Think

Strongly Connected Components brief introduction Before reading the following, be sure to understand Graph Theory Basis Part. The definition of strong connectivity is: strong connectivity of digraph G means that any two nodes in G are connected. Strongly Connected Components (SCC) is defined as a large strongly connected subgraph. What I ...

RunLoop concept A run loop is a cycle of event handling, which is used to schedule work and process events continuously. Effect Keep the program running continuously Monitor and process various events in App (touch events, timer events, selector events) Save CPU resources and improve program performance: do things while doing, rest when doing ...

After concluding the animation overview above, let's take a look at another part of Core Animation, Layer. As one of the core contents of the framework, CALayer and its subclasses, as the cornerstone of the view interface, are not only powerful in drawing, but also functional. Of course, the content of the Layer section is very complicated. It ...

Write in the front: if...else nesting, multiple options (Switch statement), for loop, while loop and do...while, break, continue knowledge points related introduction and demo summary. It's been five or six days since we finished this part of Mucho.com. Many of them are not proficient enough, and then the demo and related introductions are su ...

Algorithmic Training Tricky and Clever Password Time limit: 2.0s memory limit: 256.0MB Problem Description When we were young, the hero in our story, King Copa, had his personal data not completely hidden.This is unacceptable to him.As a result, he developed a password that was ...

JavaScript strings are used to store and process text. So when you write JS code, she always goes hand in hand, when you process user's input data, when you read or set the attributes of DOM objects, when you operate Cookie, when you convert different Date s, and so on, countless; and her many API s, there are always some impulses that people d ...

Preface Recently, in learning the source code of vue2.0, I just started to look at the source code of vdom, but I really can't find the direction, because it is added to the implementation of vdom.Many hooks of vue2.0 itself make reading more difficult. So I saw the first line saying that vdom of vue2.0 is snabbdom.On the basis of that, snabbdo ...

Scene Restoration Sometimes in pages containing input boxes, clicking on input boxes will block part of the input boxes because the keyboard pops up, affecting the user experience. iOS does not deal with this problem by default, but we can achieve the effect of automatically uploading the keyboard pop-up input box by ourselves. Test Page Idea ...

Recently, cluster storage has been skewed, with individual node storage exceeding 85%. After balancer is started, the effect is obvious, but sometimes balancer startup can not solve the problem. From the operation and maintenance stage, we know that there is such a balancer. Today, we finally hold our breath to see what happened to the balance ...

Short Book Occupy the wolfPlease note the origin of the original, thank you! background Before introducing TLAB, consider a question:When creating objects, you need to request memory of a specified size on the heap. If there are a large number of threads requesting memory at the same time, you can ensure that the same block of memory will not b ...