traversal | 易学教程

jQuery get parent sibling for this element only

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问题 I cant figure out how to write this. See my mark up structure, which is repeated multiple times on a page. <div class="module"> <div class="archive-info"> <span class="archive-meta"> open </span> </div> <div class="archive-meta-slide"> </div> </div> As you can see inside my mark-up, I have a <span> which is my $metaButton - when this is clicked, it runs the animation on the div.archive-meta-slide - this is simple enough, but I'm trying to run the animation only on the current div.module it

java array traversal in circular manner

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问题 I have an array which have 1 2 3 4 5 values. array a = [ 1 , 2, 3, 4, 5] Now i want to traverse it in circular manner. like i want to print 2 3 4 5 1 or 3 4 5 1 2 or 5 1 2 3 4 and so on. any algorithm on this? Edit: I want to print all the combination in circular manner. i don't want to state starting point at its initial phase. 回答1: int start = ... for (int i = 0; i < a.length; i++) { System.out.println(a[(start + i) % a.length]); } (If you want to iterate the array backwards from start ,

NAT traversal with Java

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问题 I want to connect to computers, each one of them behind a NAT router. I read that STUN only works with one computer behind a NAT router. Is that true? If so, how can I solve that double-NAT problem? Thanks, Thomas 回答1: UDP hole punching and TCP hole punching 回答2: TURN is a set of extensions to STUN that help to solve the double-NAT problem. You still need a server in the cloud, and the clients need to register. Source for some free servers is available. From the TURN internet draft: As

Scala cats, traverse Seq

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问题 I know I can traverse List s import cats.instances.list._ import cats.syntax.traverse._ def doMagic(item: A): M[B] = ??? val list: List[A] = ??? val result: M[List[B]] = list.traverse(doMagic) And I can convert a Seq back and forth to List val seq: Seq[A] = ??? val result: M[Seq[B]] = seq.toList.traverse(doMagic).map(_.toSeq) But can I also traverse Seq without the boilerplate? val seq: Seq[A] = ??? val result: M[Seq[B]] = seq.traverse(doMagic) Or what's an easy way to get an instance of

Structuring and Binding (ajax response)

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问题 One of the common patterns I've come across in my many years of coding is the structuring/binding of the data coming from the server response (XMLHttpRequest). This problem of creating elements and appending them in a particular order as well as binding (attributes,events,content) is what I'm am trying to achieve here. For example purposes and simplicity I am trying to create a tr --- td nested structure as well as bind the attributes from the var instructs object (table-row,table-data). JSON

Clojure data structure traversal/searching

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问题 I'd like to be able to do something like this: (search data list? (fn [x] (and (list? x) (= 4 (first x)))) (fn [x] (and (set? x) (contains x 3)))) And have it recursively search a nested data structure data : first for the shallowest lists (might be in a set of sets, for example). then within those lists for the shallowest lists who's first element is 4 . then in those lists for the shallowest sets that contain 3. finally returning a list of items found in step 3. Before I reinvent the wheel,

How to return a node, uniformly at random, from a binary search tree?

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问题 Given a BST (may or may not be balanced) how can one return "any" node uniformly at random? A constraint is you cannot use an external indexing data structure. You must traverse the tree in such a manner that every node has an equal chance of being visited. This question has me perplexed for quite a while. If we can indeed use an external hashtable/pointers we could just randomize on those and return the corresponding node. However, my colleague has put forth a rather complex variant of the

Network X , which depth searching option to select for this use?

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I am trying to ensure a global correct orientation of my normals. I.e make sure they point outwards everywhere. This is my method: I have a coordinate list x y c n . At each point in coordinate list I create edges from the point to its 5 nearest neighbours. I Weight each edge with ( 1-n1.n2 ). Compute a minimal spanning tree. Traverse this tree in depth first order. Start traversing at the point with the greatest z value, force the normal of this point to be orientated towards the positive z axis. Assign orientation to subsequent points that are consistent with their preceeding point, for

Algorithms for Directed Cyclic Graph Traversal (JavaScript)

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问题 I have a connected, directed, cyclic graph. The task is to discover every single node in the graph without falling into an infinite loop, as a regular tree traversal algorithm will do. You can assume that I already know what node to start at so as to reach all points in the directed graph, and that for each node I have a function that will return the nodes it directs to. Is there a known algorithm for finding all nodes? The main issue is really avoiding cycles, and I would love it if there

Get Repeater's Items

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问题 I am trying to get all repeater's selected checkboxes of repeater's item just before page movement (pagination), and store them in some place. foreach (RepeaterItem ri in rpt.Items) { CheckBox box = (CheckBox)ri.FindControl("chkBox"); if (box.Checked) { ... } } The problem is where do i call this function from? I've tried to call it from ObjectDataSource1_Selected (I use objectdatasource to populate repeater) and ObjectDataSource1_Selecting but rpt.Items.Count is also 0. rpt_PreRender() event