children

问题 The fan-out of a node in a tree is defined to be the number of children the node has. The fan-out of a tree is defined to be the maximum fan-out of any node in the tree. Assume tree T has n nodes and a fan-out f > 1. What is the minimum possible height of T? I have no idea how to begin this problem. I solved the first part which is to find the maximum number of nodes that can be T in terms of height h and fan-out f > 1. I got (f^(h+1) -1)/(f-1). I'm thinking you can use this to solve for the

问题 Say I have a Father class to be inherited by Children classes, later I want to add more stuff into the Father class without modifying the original Father class, please teach me how could I do it. Let me clarify my question. Any valuables and methods in Father will automatically accessible to all the Children classes, right? For example: public class Father { public int a; public int b; public int c() { return a+b; } } public class Child : Father { private int d=a*b+c(); } Now I want to add a

问题 I have a question and the answer is sure simple, but it just lacks of understanding from my side. I have a xml file with following look (short example) <item id="1234"> <property name="country_id"> <value>4402</value> </property> <property name="rc_maintenance_other"> </property> <property name="claim_right_shareholder"> </property> <property name="charges_other"> </property> <property name="other_expenses_heating"> </property> <property name="unpaid_bills_amount"> </property> <property name=

问题 Is there a better (quicker, shorter or neater) way to access a child sprite (object) 3 layers or more deep? If the children have all been given names and you know the names. Is there a better way to do it than the code I made below? var mySprite:DisplayObjectContainer = layerASprite.getChildByName(" layerA ") as DisplayObjectContainer; mySprite = mySprite.getChildByName(" layerB ") as DisplayObjectContainer; mySprite.getChildByName(" layerC ").y = 200; 回答1: If they are unique you can create a

问题 I've done this: <table id="tabla"> <tbody> <tr><th>row1</th><td>w</td></tr> <tr><th>row2</th><td>x</td></tr> </tbody> <tbody> <tr><th>row1</th><td>y</td></tr> <tr><th>row2</th><td>z</td></tr> </tbody> </table> <script type="text/javascript"> function iterate() { var table = document.getElementById("tabla").children; for (b=0; b<table.length(); b++) { var cells = table[b].children; if(cells[0].innerHtml == "row1") { if(cells[1].innerHtml == "w") { table[b].style.display="none"; } } } } <

问题 I use SlidingUpPanelLayout in my project and i have a problem with it. My SlidingUpPanelLayout has 2 children. 1) ListView for showing list of data - this is content 2) LinearLayout with his children (textvien, edittext, button) - this is slide up panel When SlidingUpPanelLayout is showing i try to click on my button, and my SlidingUpPanelLayout immediately close, and i can't click on my button and edittext. How can i get rid of this? how can i setup click/show up panel on some View? thanks!

问题 I'm having trouble getting a selector to work properly. I have this HTML: <div.wrapper> <div.ui-controlgroup-controls> <form> <div.ui-btn></div> </form> <div.ui-btn></div> <div.ui-btn></div> <div.ui-btn></div> <div.ui-btn></div> </div> </div> and I'm trying to select the div tags, which are children of ui-controlgroup-controls - which means excluding whats inside the form. This is what I'm trying: // el is my div.wrapper element el.children[0].getElementsByTagName("div"); However this does

问题 I need to check with jquery that a anchor element only has text in it and not any other tag (img, b) or any thing else. <a href="">TV</a> Should be found, but : <a href=""><img /></a> or: <a href=""><span>TV</span></a> or any other HTML tag, shouldn't be found. How do i do this? Thanks in advance. 回答1: We can use the filter() function to remove elements which have children (checked using the children() method). var emptyAs = $('a').filter(function () { return $(this).children().length == 0; }

问题 I'm attempting to loop through an HTMLCollection produced from JavaScript's .children property using the following code: var articles = data.children; var newsGrid = document.getElementById('js-news__grid'); for (var i = 0; i < articles.length; i++) { articles[i].classList.add('loading'); newsGrid.appendChild(articles[i]); }; The data variable is a fragment of a successful XHR. When I run the loop, it only appends the first child and the loop ends, and when running console.log(articles);

问题 I have a function which gets the ids of all children of a parent from my DB. So, if I looked up id 7, it might return an array with 5, 6 and 10. What I then want to do, is recursively find the children of those returned ids, and so on, to the final depth of the children. I have tried to write a function to do this, but I am getting confused about recursion. function getChildren($parent_id) { $tree = Array(); $tree_string; if (!empty($parent_id)) { // getOneLevel() returns a one-dimentional