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• How to find the number of inversions in an array ?

  - by Michael

  This is an phone interview question: "Find the number of inversions in an array". I guess they mean O(N*log N) solution since O(N^2) is trivial. I guess it cannot be better than O(N*log N) since sorting is O(N*log N) I have checked a similar question from SO and can summarize the answers as follows: Calculate half the distance the elements should be moved to sort the array : copy the array and sort the copy. For each element of the original array a[i] find it's position j in the sorted copy (binary search) and sum abs(i - j)/2. Modify merge sort : modify merge to count inversions between two sorted arrays (it takes O(N)) and run merge sort with the modified merge. Does it make sense ? Are there other (maybe simpler) solution ? Isn't it too hard for a phone interview ?

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• Simple doubt related to strings in C (question in an interview)

  - by piemesons

  // The first example: char text[] = "henri"; char *p; p = text; *(p + 1) = 'E'; // Output = hEnri // Now If we want to remove the "e" ie hnri, we would go for????? *(p + 1)=????? Please dont say start copying the array. I am looking for the best solution. Its an interview question... EDIT I specially mentioned the question that i am not asking for the solution like start moving the element. I thought there must be some other good solution..

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• Zend Framework: My custom form filter is not filtering!

  - by Andrew

  So I have a form that is using a custom filter (which is really just a copy of Zend_Filter_Null). When I call it directly, it works: $makeZeroNull = new My_Filter_MakeZeroNull(); $null = $makeZeroNull->filter('0'); //$null === null However, when I try to add it to an element in my form, it doesn't filter the value when I call getValue(). class My_Form extends Zend_Form { public function init() { $makeZeroNull = new My_Filter_MakeZeroNull(); $this->addElement('text', 'State_ID', array('filters' => array($makeZeroNull))); } } //in controller if ($form->isValid($_POST)) { $zero = $form->State_ID->getValue(); //getValue() should return null, but it is returning 0 } What is going on? What am I doing wrong?

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• Reading data from a plist file

  - by K2Digital

  I'm trying to implement a Save State for my iPhone App. I've got a plist file called SaveData.plist and I can read it in via the following NSString *pListPath2 = [bundle pathForResource:@"SaveData" ofType:@"plist"]; NSDictionary *dictionary2 = [[NSDictionary alloc] initWithContentsOfFile:pListPath2]; self.SaveData = dictionary2; [dictionary release]; The Plist file has members SavedGame which is a Boolean to tell the app if there really is valid data here (if they did not exit the app in the middle of a game, I don't want their to be a Restore Point. Score which is an NSNumber. Time which is an NSNumber Playfield which is a 16 element array of NSNumbers How do I access those elements inside of the NSDictionary?

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• Jquery attach show event to select option

  - by John

  Hi, I have a select form element with 5 options. If option 2 is selected I want to display another form input box (this has a style of display:none initially). How can I attach an event to option 2 so that whenever it is selected the input box is shown otherwise it is hidden. I have this currently but this does not handle is option 2 is already selected when the page loads $('#type').change(function(){ var typeSelected = $(this).val(); if (typeSelected == 2) { $('#extraInput').show(); } }); I know I could add another bit of code which checks what is selected on page load but wondered if there was a neater way of doing this. Also something that could handle the hiding of the input box if option 2 is not selected at the start as currently I have just hard-coded style="display:none" onto the input box but I would prefer this to be dynamic. Thanks

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• How do I make the footer stretch vertically downward align to footer.

  - by text

  I am new to web design using tableless and I'm having problem positioning some elements on my page.. Here's the sample html: http://christianruado.comuf.com/sample.html As you can see from the screen shots I want my right div to be vertically stretched down to the same level of my footer and position my bottom element to the lowest part of the right container. #right { float:right; width: 19%; background:#FF3300; margin-left:2px; height: 100%; } #right .bottom { bottom:0; display:block; background-color:#FFCCFF; height:30px; }

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• AJAX form sections - how to pass url of next stage of form

  - by dan727

  Hi, I've got a multi-part form (in a PHP MVC setup) which I have working correctly without javascript enhancement. I'm starting to add the AJAX form handling code which will handle each stage of a form submission, validating/saving data etc, before using AJAX to load the next stage of the form. I'm wondering how best to pass the URL of the next stage to the current form being processed, so that my jQuery form handling code can process the current form, then load the next part via AJAX. The form "action" is different from what the url of the next stage of the form is - what do you think would be good practice here? I was thinking about either appending the url of the next stage to the form action url, via a query string - then just use javascript to extract this url when the form is successfully processed. The other option is via a hidden form element. Not sure what other client side options I have here Any thoughts?

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• How can CopyOnWriteArrayList be thread-safe?

  - by Shooshpanchick

  I've taken a look into OpenJDK's sources of CopyOnWriteArrayList and it seems that all write operations are protected by the same lock and read operations are not protected at all. As I understand, under JMM all accesses to a variable (both read and write) should be protected by lock or reordering effects may occur. For example, set(int, E) method contains these lines (under lock): /* 1 */ int len = elements.length; /* 2 */ Object[] newElements = Arrays.copyOf(elements, len); /* 3 */ newElements[index] = element; /* 4 */ setArray(newElements); The get(int) method, on the other hand, only does return get(getArray(), index);. In my understanding of JMM, this means that get may observe the array in an inconsistent state if statements 1-4 are reordered like 1-2(new)-4-2(copyOf)-3. Do I understand JMM incorrectly or is there any other explanations on why CopyOnWriteArrayList is thread-safe?

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• jquery beginner: change background on click

  - by user1873217

  I'm trying to change the background of an element on click based on the current color. Here's the relevant html: <div id="rect" style="height: 100px; width:300px; background: red"> </div> and my jquery attempt: $("#rect").click(function() { if ($(this).css('background') == 'red') { $(this).css('background','blue');} else {$(this).css('background','yellow');} }); I'm always getting a yellow box; the 'true' condition never fires. What am I doing wrong?

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• Using new to allocate an array of class elements with an overloaded constructor in C++.

  - by GordoN

  As an example say I have a class foo that does not have a default constructor but one that looks like this foo:foo(int _varA,int _varB) { m_VarA = _varA; m_VarB = _varB; } How would I allocate an array of these. I seem to remember trying somthing like this unsuccessfully. foo* MyArray = new foo[100](25,14). I don't think this will work either. foo* MyArray = new foo[100](25,14) Can this be done? I typically do this by writing the default constructor using some preset values for _varA and _varB. Then adding a function to reset _varA and _varB for each element but that will not work for this case. Thanks for the help.

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• getting the value of a filter at an arbitrary time

  - by Andiih

  Context: I'm trying to improve the values returned by the iPhone CLLocationManager, although this is a more generally applicable problem. The key is that CLLocationManger returns data on current velocity as and when it feels like it, rather than at a fixed sample rate. I'd like to use a feedback equation to improve accuracy v=(k*v)+(1-k)*currentVelocity where currentVelocity is the speed returned by didUpdateToLocation:fromLocation: and v is the output velocity (and also used for the feedback element). Because of the "as and when" nature of didUpdateToLocation:fromLocation: I could calculate the time interval since it was last called, and do something like for (i=0;i<timeintervalsincelastcalled;i++) v=(k*v)+(1-k)*currentVelocity which would work, but is wasteful of cycles. Especially as I probably want timeintervalsincelastcalled to be measured as 10ths of a second. Is there a way to solve this without the loop ? i.e. rework (integrate?) the formula so I put an interval into the equation and get the same answer as I would have by iteration ?

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• Trouble with Canvas rendering in Safari/Opera

  - by Jon

  Been banging my head against this one for a while, and figured I'd turn to the experts for some advice. I've made a jQuery snippet that grabs the values from a table and plots them in a line graph on a canvas element (also generated by the JS). All's well in Firefox and Chrome, but Safari and Opera aren't displaying the plotted points. I've reviewed in Firebug, Web Inspector debugger, JSLint, and checked the markup with the w3 validator, but still can't find anything glaringly obvious. Any chance one of you guys could help me out? Here's a page with a simplified example: http://bit.ly/aAshPQ Thanks!

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• Creating triangles using borders

  - by Interstellar_Coder

  I recently needed to create speech bubbles. To create the little tip at the end of the speech bubble, i used a css technique where the element is given a 0 width and 0 height and given borders. Making certain borders transparent would create diagonals. This works great, and i am able to manipulate different borders to create triangles/shapes to my liking. The problem is, i don't fully understand why this works. I understand that it all starts out with a rectangle and as you set one or more of the borders to transparent it creates a diagonal. My question is how does this work ? And why does it create a diagonal in the first place ? EDIT: To clarify, i would like to know the theory behind why this technique works.

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• Grammatically correct double-noun identifiers, plural versions

  - by Michal Czardybon

  Consider compounds of two nouns, which in natural English would most often appear in the form "noun of noun", e.g. "direction of light", "output of a filter". When programming we usually write "LightDirection" and "FilterOutput". Now, I have a problem with plural nouns. There are two cases: 1) singular of plural e.g. "union of (two) sets", "intersection of (two) segments" Which is correct, SetUnion and SegmentIntersection or SetsUnion and SegmentsIntersection? 2) plural of plural There are two subcases: (a) Many elements, each having many related elements, e.g. "outputs of filters" (b) Many elements, each having single related element, e.g. "directions of vectors" Shell I use FilterOutputs and VectorDirections or FiltersOutputs and VectorsDirections? I suspect correct is the first version (FilterOutupts, VectorDirections), but I think it may lead to ambiguities, e.g. FilterOutputs - many outputs of a single filter or many outputs of many filters? LineSegmentProjections - projections of many segments or many projections of a single segment?

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• Can JAXB store the class name in the XML so that the the deserialize code doesn't need knowledge of the class?

  - by Andrew

  It seems the standard approach for deserializing JAXB XML is to specify the package name when creating the context. Then, JAXB looks up the class based on the root element: JAXBContext jc = JAXBContext.newInstance("com.foo"); Unmarshaller u = jc.createUnmarshaller(); Object o = u.unmarshal(new StringReader("...")); I'm looking for a more flexible approach where I don't have to specify the package name and could still deserialize any object. This would be as simple as JAXB storing the package in the XML, but I can't seem to find out how to do this. I can write the code to do it myself but that would be unpleasant. It would like JAXB to do it, if possible. BTW, I am not using schemas, just Annotations and marshal/unmarshal. Any ideas?

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• What is the best way to pass server side variables to JavaScript on the client side?

  - by steve_c

  Our application uses a lot of configuration options. Those options need to be reflected on the client side in the form of User preferences, site wide preferences, etc. Currently, we pass server side settings down to the client side in the form of JSON that is stored in custom attributes in the markup for a specific element (and no, our application currently doesn't worry about W3C validation). We then retrieve the data from the custom attribute, and parse it into a JSON object for use in script using jQuery. One drawback to this is referencing attributes on elements from within event handlers. I know this is frowned upon, as it can create circular references, and subsequently memory leaks. I would much prefer to use jQuery's data function, but you can't invoke this from the server side at page render time. What does everyone else do in this type of scenario?

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• Wrapping 3 objects or less inside a while / foreach in PHP

  - by DarkGhostHunter

  Simple question. I have an array of 21 elements, and show every three of them inside a <div> block. The code is something like this: <?php $faces= array( 1 => 'happy', 2 => 'sad', (sic) 21 => 'angry' ); $i = 1; foreach ($faces as $face) { echo $face; $i++; } ?> The problem lies when this array doesn't have 21 elements, sometimes it gets 24, an other times 17. How I wrap every three of them, and wrap alone the rest? I came up with using switch and case, but that works only when there are 21 elements only. I think I could count them beforehand and put a closing in the last one (even if it is a group of one element).

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• Accessing "current class" from WPF custom MarkupExtension

  - by chaiguy

  I'm attempting to write a custom MarkupExtension to make my life easier by giving me a better way to specify bindings in XAML. However I would like to know if there is any way I can access the object that represents the file the MarkupExtension is used in. In other words, suppose I have a UserControl that defines a particular rendition of a data model of my program. This control has lots of visual stuff like grids, borders and general layout. If I use my MarkupExtension on a particular property of some element in this UserControl, I want to access the instance of the UserControl, without knowing what type it is (I plan on using reflection). Is this at all possible?

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• jQuery pagination go to page on input value change

  - by JV10

  I'm creating some pagination for my website, and want to use an input-element to navigate between pages. Like the following example: The input would require the "return" key to be hit for the script to trigger. If the value entered is not within range and alert would trigger. e.g. If there was 32 pages, "Please enter a value between 1 and 32" Can this be done using jQuery or javascript, by detecting the value change within the range of pages and redirecting to that page? I'm trying to create the same device on Getty Images: http://www.gettyimages.com.au/Search/Search.aspx?contractUrl=2&language=en-US&family=creative&p=ball&assetType=image&clarification=ball%3A60847

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• how to get dynamically created elements width and apply style to that?

  - by 3gwebtrain

  Hi, I am creating an li element dynamically like this: $(data).find('slide').each(function(numSlide){ var slideLink = $(this).attr('link'); var slideimage = $(this).children('slideimage').text(); var slidedesc = $(this).children('slidedesc').text(); $('.slider ul').append('<li><a href="'+slideLink+'"><img src="'+root+"images/top-slider-image/"+slideimage+'" alt="welcome to Burger Davis Blog" /></a><div class="note">'+slidedesc+'</div></li>'); }) But I'd like to calculate the width of the li, and I need to apply some style to it -- how can I do that? If I add styles via the css method, it does not work for dynamically created elements... Please help me to get dynamic elements' width and how to apply styles into that? I know we can use the live function, but I can't get even by that..

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• XForms: set default selection in dropdown in binding

  - by Purni

  I have a main instance named 'myinstance' which has the element . Color can be 'Red', 'Blue', 'Green' or ''Yellow'. The colors are populated in a drop-down from another instance called 'colorsinstance'. When my form loads, I want the default in the dropdown to be set to 'Green' in the nodeset binding. <instance id="colorsinstance"> <items> <item label="Color1" value="Red"/> <item label="Color2" value="Blue"/> <item label="Color3" value="Green"/> <item label="Color4" value="Yellow"/> </items> </instance> Main instance binding is as follows: <xforms:bind nodeset="instance('myinstance')"> <xforms:bind nodeset="./color" required="true()"/> </xforms:bind>

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• Can I set a style for the content of an iframe from the main page?

  - by Joel Coehoorn

  We have a page the embeds a Google Calendar in an iframe. Recently, a warning box div began appearing on the calendar that looks like this: <div id="warningBox" style="color:#aa0000;">Events from one or more calendars could not be shown here because you do not have the permission to view them.</div> Obviously the best solution here is to find the private events and remove them, but so far the search for those events has proved fruitless. This calendar is an aggregate of several calendars, including a few we don't control (ie weather). We're still looking, but in the meantime, I would like to try to hide that div. I know that iframes enforce the separation between the pages, such that the child page is pretty much a law unto itself. But surely there must be some way to set a style on an element inside the frame?

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• Many-to-one relationship in SQLAlchemy

  - by Arrieta

  This is a beginner-level question. I have a catalog of mtypes: mtype_id name 1 'mtype1' 2 'mtype2' [etc] and a catalog of Objects, which must have an associated mtype: obj_id mtype_id name 1 1 'obj1' 2 1 'obj2' 3 2 'obj3' [etc] I am trying to do this in SQLAlchemy by creating the following schemas: mtypes_table = Table('mtypes', metadata, Column('mtype_id', Integer, primary_key=True), Column('name', String(50), nullable=False, unique=True), ) objs_table = Table('objects', metadata, Column('obj_id', Integer, primary_key=True), Column('mtype_id', None, ForeignKey('mtypes.mtype_id')), Column('name', String(50), nullable=False, unique=True), ) mapper(MType, mtypes_table) mapper(MyObject, objs_table, properties={'mtype':Relationship(MType, backref='objs', cascade="all, delete-orphan")} ) When I try to add a simple element like: mtype1 = MType('mtype1') obj1 = MyObject('obj1') obj1.mtype=mtype1 session.add(obj1) I get the error: AttributeError: 'NoneType' object has no attribute 'cascade_iterator' Any ideas?

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• JS DOM: Get elements by text content.

  - by hristo

  Hello! I am looking for a way to perform fulltext search on the DOM tree with JS. In two words, I would like to retrieve the list of text nodes which contain a given string. I've tried mootools' Element.getElements ( ':contains[string]' ) but I can't get it to work with strings containing whitespace. I'm thinking about simply indexing all text nodes and checking against each node for the string being searched for, but, in my project, there's no way of telling when the DOM updates in order to maintain such an index up-to-date. Any better ideas? Thanks

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• Basic help needed with pointers

  - by sbsp

  Hi, i asked some time ago on an account i cant remember how to manipulate basic pointers and someone gave me a really good demo for example char *ptr = hello (hello = a char array) so now *ptr is pointing at h ptr++ = moves the ptr to point at the next element, to get its value i do *ptr and that gives me e ok so far i hope :D but now i need to manipulate a char **ptr and was wondering how i do this in a way that mimmicks the effects of a 2d array? some basic tips would be much appreciated as i need to do an assignment that has a **ptr to immitate a 2d array and without knowing how it does this first means i cant even solve it on paper (for example, how do you dereference a **ptr, how do you get [x][y] values etc) thanks

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