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• Given a string of red and blue balls, find min number of swaps to club the colors together

  - by efficiencyIsBliss

  We are given a string of the form: RBBR, where R - red and B - blue. We need to find the minimum number of swaps required in order to club the colors together. In the above case that answer would be 1 to get RRBB or BBRR. I feel like an algorithm to sort a partially sorted array would be useful here since a simple sort would give us the number of swaps, but we want the minimum number of swaps. Any ideas? This is allegedly a Microsoft interview question according to this.

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• jQuery.keypad Performance Issues

  - by John Duff

  I am working on a Kiosk Touch Screen application and using the JQuery.keypad plugin and noticing some major performance issues. If you click a number of buttons in rapid succession the CPU gets pegged, the button clicks don't keep up with the clicking and some button presses even get lost. On my dev machine this isn't as noticeable, but on the Kiosk itself with 1 gig of ram it's painful. Trying the demo keypad at http://keith-wood.name/keypad.html#inline the one with multiple targets (which is the case with mine) has the exact same issues. Does anyone have any suggestions on how we might be able to improve this? The Kiosk runs in Firefox only so something specific to that would work. I'm using v1.2.1 of jquery.keypad and just upgraded to v1.4.2 of jquery.

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• Can I access the function body of an event listener using nodeJS jsdom

  - by Zhami

  I am using jsdom with nodeJS. I load in a large HTML document, and am using jQuery to navigate the DOM. I have a case where I have an element, and I need to access the function body of an event listener (onclick). The event listener was added in the source HTML: <a href="#" onclick="javascript:window.open('http://<rest-of-url>'); return false;"></a> The onclick attribute of the DOM element is undefined. btw: what I really want to do is get the URL (please note that <rest-of-url> is not what is in the source, a real URL spec is there) that is specified in the source.

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• IWebBrowser2: how to force links to open in new window?

  - by Rob McAfee

  The MSDN documentation on WebBrowser Customization explains how to prevent new windows from being opened and how to cancel navigation. In my case, my application is hosting an IWebBrowser2 but I don't want the user to navigate to new pages within my app. Instead, I'd like to open all links in a new IE window. The desired behavior is: user clicks a link, and a new window opens with that URL. A similar question was asked and answered here and rather than pollute that answered post, it was suggested I open a new discussion. The members on the related post suggested I should be able to do this by trapping DISPID_BEFORENAVIGATE2, setting the cancel flag, and writing code to open a new window, but I've found out that the browser control gets lots of BeforeNavigate2 events that seem to be initiated by scripts on the main page. For example, amazon.com fires BeforeNavigate2 events like crazy, and they are not a result of link invocation. Replies appreciated!

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• How to substr html entities properly?

  - by Emily

  Hi everyone. I have like this : $mytext="that&#039;s really &quot;confusing&quot; and &lt;absolutly&gt; silly"; echo substr($mytext,0,6); The output in this case will be : that&# instead of that's What i want is to count html entities as 1 character then substr, because i always end up with breaked html or some obscure characters at the end of text. Please don't suggest me to html decode it then substr then encode it, i want a clean method :) Thanks

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• Preventing EF4 ConstraintException when invoking TryUpdateModel

  - by twk

  Given following ASP.NET MVC controller code: [HttpPost] public ActionResult Create(FormCollection collection) { string[] whitelist = new []{ "CompanyName", "Address1", "Address2", ... }; Partner newPartner = new Partner(); if (TryUpdateModel(newPartner, whitelist, collection)) { var db = new mainEntities(); db.Partners.AddObject(newPartner); db.SaveChanges(); return RedirectToAction("Details/" + newPartner.ID); } else { return View(); } } The problem is with the Entity Framework 4: the example Partner entity is mapped to a database table with it's fields NOT ALLOWED to be NULL (which is ok by design - they're required). Unfortunately, invoking TryUpdateModel when some of the properties are nulls produces ConstraintException which is not expected! I do expect that TryUpdateModel return false in this case. It is ok that EF wouldn't allow set a property value to null if it should not be, but the TryUpdateMethod should handle that, and add the error to ModelState errors collection. I am wrong, or somebody screwed the implementation of TryUpdateModel method?

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• Python: Repeat elements in a list comprehension?

  - by User

  I have the following list comprehension which returns a list of coordinate objects for each location. coordinate_list = [Coordinates(location.latitude, location.longitude) for location in locations] This works. Now suppose the location object has a number_of_times member. I want a list comprehension to generate n Coordinate objects where n is the number_of_times for the particular location. So if a location has number_of_times = 5 then the coordinates for that location will be repeated 5 times in the list. (Maybe this is a case for a for-loop but I'm curious if it can be done via list comprehensions)

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• When compiling programs to run inside a VM, what should march and mtune be set to?

  - by Russ

  With VMs being slave to whatever the host machine is providing, what compiler flags should be provided to gcc? I would normally think that -march=native would be what you would use when compiling for a dedicated box, but the fine detail that -march=native is going to as indicated in this article makes me extremely wary of using it. So... what to set -march and -mtune to inside a VM? For a specific example... My specific case right now is compiling python (and more) in a linux guest inside a KVM-based "cloud" host that I have no real control over the host hardware (aside from 'simple' stuff like CPU GHz m CPU count, and available RAM). Currently, cpuinfo tells me I've got an "AMD Opteron(tm) Processor 6176" but I honestly don't know (yet) if that is reliable and whether the guest can get moved around to different architectures on me to meet the host's infrastructure shuffling needs (sounds hairy/unlikely). All I can really guarantee is my OS, which is a 64-bit linux kernel where uname -m yields x86_64.

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• Can this be done with single SQL query

  - by Ghostrider

  I'm using MySQL. I have a table Type SubType 1 1 1 5 1 6 1 8 2 2 2 3 3 1 3 2 3 3 For each type there is some number of subtypes. For every subtype in a type there is a corresponding subtype in the next type: (1,1) => (2,2) (1,5) => (2,3) (1,6) => (2,2) (1,8) => (2,3) (2,2) => (3,1) (2,3) => (3,2) In case you haven't seen the pattern, here it is: you sort both current and next types by subtype, then in the next type you get subtype in the same position as your current subtype in current type is. If there are more subtypes in the current type that in the next one, you warp around and start from the first subtype in the next type. Is it possible to construct a query that takes current type and subtype and returns corresponding subtype in the next type?

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• how to create a new variant in bjam

  - by steve jaffe

  I've tried reading the documentation but it is rather impenetrable so I'm hoping someone may have a simple answer. I want to define a new 'variant', based on 'debug', which just adds some macro definitions to the compiler command line, eg "-DSOMEMACRO". I think I may be able to do this as a "sub-variant" of debug, or else just define a new variant copying 'debug', but I'm not even sure where to do this. It looks like feature.jam in $BOOST_BUILD_DIR/build may be the place. Perhaps what I really want is simply a new 'feature' but it's still not clear to me exactly what I need to do and where, and I don't know if a 'feature' allows me to direct the build products to a different directory to the 'debug' build. Any suggestions will be appreciated. (In case you're wondering, I have to use bjam since it has been adopted as our corporate standard.)

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• Set Java Application's virtual machine max memory without access to VM parameters because of custom

  - by Tom

  I'm using a Java application which allows you to import custom files. On import, these files are loaded into memory. The problem is that the files I want to import are very big, this causes an OutOfMemory exception. The crash log also informs me that the VM was started with the java parameter "-Xmx512m", I want to alter this to "-Xmx1024m" so that I got double the memory available. The problem is that this application is using it's own JRE folder and that there's a launcher written in C which is calling the jvm.dll file. In any way, java.exe or javaw.exe are never called and thus I cannot set these parameters myself (if I delete these executables it doesn't matter, can still run the application - this is not the case with the dll). So, my question is, can I set this VM parameter in an other way? I'm even willing to alter the JRE files if there is no other way.

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• Microsoft sublanguage string to locale identifier

  - by Jacob

  I can't seem to find a way to convert, or find, a local identifier from a sublanguage string. This site shows the mappings: http://msdn.microsoft.com/en-us/library/dd318693(v=VS.85).aspx I want the user to enter a sublanguage string, such as "France (FR)" and to get the local identifier from this, which in this case would be 0x0484. Or the other way around, if a user enters 0x0480 then to return French (FR). Has anyone encountered this problem before and can point me in the right direction? Otherwise I'm going to be writing a few mapping statements to hard code it and maintain future releases if anything changes. BTW, I'm coding in C++ for Windows platform. Cheers

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• When to use Vanilla Javascript vs. jQuery?

  - by jondavidjohn

  I have noticed while monitoring/attempting to answer common jQuery questions, that there are certain practices using javascript, instead of jQuery, that actually enable you to write less and do ... well the same amount. And may also yield performance benefits. A specific example $(this) vs this Inside a click event referencing the clicked objects id jQuery $(this).attr("id"); Javascript this.id; Are there any other common practices like this? Where certain Javascript operations could be accomplished easier, without bringing jQuery into the mix. Or is this a rare case? (of a jQuery "shortcut" actually requiring more code) EDIT : While I appreciate the answers regarding jQuery vs. plain javascript performance, I am actually looking for much more quantitative answers. While using jQuery, instances where one would actually be better off (readability/compactness) to use plain javascript instead of using $(). In addition to the example I gave in my original question.

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• problem using ant move task

  - by user315228

  I have a directory structure like this client/lib a.jar b-4.3.jar c-1.2.jar d-4.3.jar e.jar I need to copy some jars without version and some with version. The only information that i have is version number, and that is stored in a variable. Problem is version number that i have in variable is 4.3.1 and version that jars have is just first two digits from the variable value (i.e. 4.3 in my case). I need all the jars that has starting two digits that my variable has and some of the jars without version. For e.g. from above directory structure i need: b-4.3.jar d-4.3.jar e.jar Can somebody please help?

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• Query multiple models with one value

  - by swoei

  I have multiple models which all have a FK to the same model. All I know is the FK how can I determine which of the models has the FK attached? Below an example to clearify: class ModelA(models.Model): title = models.CharField("title", max_length=80) class ModelB(models.Model): fk = models.ForeignKey(ModelA) class ModelC(models.Model): fk = models.ForeignKey(ModelA) How can I figure out without using a try/except on each model whether B or C has the FK? (The FK can only be in one of them, for the record in this case I only added two models but in the real world app there are multiple possible x amount of models which have the FK to modelA)

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• setting a timeout for an InputStreamreader variable

  - by Noona

  I have a server running that accepts connections made through client sockets, I need to read the input from this client socket, now suppose the client opened a connection to my server without sending anything through the server's socket outputstream, in this case, while my server tried to read the input through the client socket's inputstream, an exception will be thrown, but before the exception is thrown i would like a timeout say of 5 sec, how can I do this? currently here's how my code looks like on the server side: try { InputStreamReader clientInputStream = new InputStreamReader(clientSocket.getInputStream()); int c; StringBuffer requestBuffer = new StringBuffer(); while ((c = clientInputStream.read()) != -1) { requestBuffer.append((char) c); if (requestBuffer.toString().endsWith(("\r\n\r\n"))) break; } request = new Request(requestBuffer.toString(), clientSocket); } catch (Exception e) // catch any possible exception in order to keep the thread running { try { if (clientSocket != null) clientSocket.close(); } catch (IOException ex) { ex.printStackTrace(); } System.err.println(e); //e.printStackTrace(); }

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• How to index a date column with null values?

  - by Heinz Z.

  How should I index a date column when some rows has null values? We have to select rows between a date range and rows with null dates. We use Oracle 9.2 and higher. Options I found Using a bitmap index on the date column Using an index on date column and an index on a state field which value is 1 when the date is null Using an index on date column and an other granted not null column My thoughts to the options are: to 1: the table have to many different values to use an bitmap index to 2: I have to add an field only for this purpose and to change the query when I want to retrieve the null date rows to 3: locks tricky to add an field to an index which is not really needed What is the best practice for this case? Thanks in advance Some infos I have read: Oracle Date Index When does Oracle index null column values?

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• Accept-Encoding headers being sent by browser but not received by server

  - by Daniel Jacobs

  I have been trying to debug this for weeks. All of the browsers on all of the clients on my home network are sending 'Accept-Encoding: gzip,deflate'. However, that header is somehow, somewhere being dropped before the request makes it to a web server. For example, http://www.whatsmyip.org/http_compression/ says 'No, your browser is not requesting compressed content'. I've used Fiddler to make sure that all of my browsers are indeed sending the header. I've swapped out my router. I've turned off all anti-virus software. Brighthouse/Roadrunner (the local cable ISP) says they are not doing any filtering (and I can't see why they would in this case). Any suggestions would be most welcome!

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• Stream classes ... design, pattern for creating views over streams

  - by ToxicAvenger

  A question regarding the design of stream classes - I need a pattern to create independent views over a single stream instance (in my case for reading). A view would be a consecutive part of the stream. The problem I have with the stream classes is that the state (reading or writing) is coupled with the underlying data/storage. So if I need to partition a stream into different segments (whether segments overlap or not doesn't matter), I cannot easily create views over the stream, the views would store start and end position. Because reading from a view - which would translate to reading from the underlying stream adjusted based on the start/end positions - would change the state of the underlying stream instance. So what I could do is take a read on a view instance, adjust the Position of the stream, read the chunks I need. But I cannot do that concurrently. Why is it designed in such a way, and what kind of pattern could I implement to create independet views over a single stream instance which would allow to read/write independently (and concurrently)?

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• Anything wrong with this code?

  - by Scott B

  Do I actually have to return $postID in each case, in the code below? This is code required for capturing the values of custom fields I've added to the WP post and page editor. Got the idea from here: http://apartmentonesix.com/2009/03/creating-user-friendly-custom-fields-by-modifying-the-post-page/ add_action('save_post', 'custom_add_save'); function custom_add_save($postID){ if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) { return $postID; } else { // called after a post or page is saved if($parent_id = wp_is_post_revision($postID)) { $postID = $parent_id; } if ($_POST['my_customHeader']) { update_custom_meta($postID, $_POST['my_customHeader'], 'my_customHeader'); } else { update_custom_meta($postID, '', 'my_customHeader'); } if ($_POST['my_customTitle']) { update_custom_meta($postID, $_POST['my_customTitle'], 'my_customTitle'); } else { update_custom_meta($postID, '', 'my_customTitle'); } } return $postID; //IS THIS EVEN NECESSARY? } function update_custom_meta($postID, $newvalue, $field_name) { // To create new meta if(!get_post_meta($postID, $field_name)){ add_post_meta($postID, $field_name, $newvalue); }else{ // or to update existing meta update_post_meta($postID, $field_name, $newvalue); } }

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• Possible to use Javascript to get data from other sites?

  - by Xavier

  Is it possible for a web page using Javascript to get data from another website? In my case I want to get it for calculations and graphing a chart. But I'm not sure if this is possible or not due to security concerns. If it is considered a no no but there is a work around I would appreciate being told the work around. I don't want to have to gather this information on the server side if possible. Any and all help is appreciated.

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• Is it valid to replace http:// with // in a <script src="http://...">?

  - by Darryl Hein

  I have the following tag: <script type="text/javascript" src="https://cdn.example.com/js_file.js"></script> In this case the site is HTTPS, but the site may also be just HTTP. (The JS file is on another domain.) I'm wondering if it's valid to do the following for convenience sake: <script type="text/javascript" src="//cdn.example.com/js_file.js"></script> I'm wondering if it's valid to remove the http: or https: ? It seems to work everywhere I have tested, but are there any cases where it doesn't work?

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• IE to show Full URL path in the Title bar as in Status Bar

  - by Slavin

  Windows XP and IE8. Tabbed Browsing is OFF. So every single web page has its own title. I want to see in the title the same as I see in the Status bar i.e. I want the full URL of the web page I am viewing to be displayed in the Title bar, and so in the Task bar button too. How to achieve this? Thanks for all the answers in advance. Looks like this is rare case.

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• ActionScript: Determine wether superclass implements a particular interface?

  - by David Wolever

  Is there any non-hacky way to determine wether a class' superclass implements a particular interface? For example, assume I've got: class A extends EventDispatcher implements StuffHolder { private var myStuff = someKindOfStuff; public function getStuff():Array { if (super is StuffHolder) // <<< this doesn't work return super['getStuff']().concat([myStuf]); return [myStuff]; } class B extends A { private var myStuff = anotherKindOfStuff; } How could I perform that super is StuffHolder test in a way that, well, works? In this case, it always returns true.

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• Plone, behaviour of URLs

  - by jpet

  The situation is the following: I created a site with Plone, developed, used, but behind a test URL. Now it has to be published, but the test URL is not appropriate and I don't want to move the site. I think, if I use a redirect, it won't be appear in the URL-bar, only in the case of site start page. Am I wrong? (The test URL should not be used, because it will be a "semi-official" site.) What do you suggest to do? As far as I can see Plone uses absolute URLs everywhere. I can add relative URLs, but if I create a new page, a new event, etc., then they have absolute URLs on other automatically generated inner pages. Is there any way to convert these URLs to relative paths? Is there any setting possibilty where only a checkbox changes this default setting?

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