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• Array sum of difference of first smallest k elment

  - by prateeak ojha

  Hi i come across this challenge on an online programing challange the task is so simple for ex WE have to variable N and K where N is where N is lenght of array and we have to find sum of duiffrence of K smallest element of array as Sample Input 10 4 1 2 3 4 10 20 30 40 100 200 Sample Output 10 Explanation #0 We have 10 as N size of array and K is 4 here the next N values are array's elments in order to find sum of diffrences we will takek smallest values from array which are 1,2,3,4 then will perform operation(sum of difference) as |1-2| + |1-3| + |1-4| + |2-3| + |2-4| + |3-4| = 10 I tried solving the problem and found a way through which i can solve the problem wit N^3 complexity but my solution is rejected i need a approach to solve the problem with n complexity i still can't figure out a way .. looked at some solution but coud'nt find the exact way to approach. if anybody have a better idea and would like to share it would be appreciable thanks in advance

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• AHCI, Power Mode S3 and HPET 64bit - please help with these settings!

  - by thetattoo

  my problem is the that for a Hackintosh (unofficial PC running OS X) I needed to set AHCI, Power Mode S3 and HPET 64bit. Now, I want to install Ubuntu (when 12.04 comes out) and was wondering if these settings will be right to use for Ubuntu. I read that AHCI is how the hard disks are accessed, Power Mode S3 is how suspend works with the RAM but couldn't figure out if using HPET 64bit makes any difference than HPET 32bit. What I would like is an explanation of what these BIOS settings do and what is best for Ubuntu. Thank you very much

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• Predicate in Java

  - by srikanth

  I am going through the code which uses Predicate in Java. I have never used predicate. Can someone guide me to any tutorial or conceptual explanation of predicate and their implementation in java ? Google didnt help much...

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• How to use Android GradientDrawable

  - by Janusz

  I try to use the GradientDrawable to set a gradient to some backgrounds and buttons. Sadly the documentation is not very detailed. What are the main attributes to configure the gradient? I understand start and endcolor but some of the other attributes could need some explanation. At the moment I used images as the background for the buttons but a drawable defined in XML would be much nicer. I try to get a look like this (It is a very light gradient):

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• WIX HeatDirectory Task - Setting the preprocessorVariable

  - by Stuart

  I'm trying to set the preprocessor variable in wix and i'm unable to find an example of this or explanation on how to do it anywhere on the internet, i'm hoping somebody here can explain or show me where im going wrong! I have tried the example shown here regarding setting var values http://www.ageektrapped.com/blog/setting-properties-for-wix-in-msbuild/ The documentation for using the HeatDirectory taks in wix can be found here and is not very useful at all! How do i set the preprocessorVariable to substitute the SourceDir for another variable name?

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• Floating point inaccuracy examples

  - by David Rutten

  How do you explain floating point inaccuracy to fresh programmers and laymen who still think computers are infinitely wise and accurate? Do you have a favourite example or anecdote which seems to get the idea across much better than an precise, but dry, explanation? How is this taught in Computer Science classes?

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• Private constructor and public parameter constructor -C#

  - by Amutha

  I heard that private constructor prevent object creation from outside world. When i have a code public class Product { public string Name { get;set;} public double Price {get;set;} Product() { } public Product(string _name,double _price) { } } here still i can declare public constructor(parameter),won't it spoil the purpose of private constructor? When do we need both private and public constructor(parameter) in code? I need detailed explanation please.

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• fft understanding

  - by maximus

  Can somebody give a good explanation of FFT image transform How the FFT transformed image and it's Re^2+Im^2 image can be analyzed? I just want to understand something when loiking to the image and it's frequency.

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• Custom UITableViewCell rounded corners (grouped style)

  - by Urizen

  When creating a custom UITableViewCell I notice that it looks as expected in 'plain' style but that the corners of the cells are not rounded if the table view is displayed in 'grouped' style: i.e. the corners are square. I have searched but cannot find any real explanation of why this happens and, more importantly, how to remedy this effect.

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• Problem in getting UnprocessedDocuments and CurrentDatabase using C# (domino.dll)

  - by Preeti

  Hi, I trying below code: NotesSession = _lotesNotesSession.GetDatabase("", NsfFile, false); _NewDatabase = _NotesSession.CurrentDatabase; ( Note : Showing "Not Implemented" exception.) _UnreadDocCollection = _NewDatabase.UnprocessedDocuments; Here i am trying to get list of Read and Unread Mails From Nsf File. Regards, Preeti Explanation: When i am using _NotesSession.CurrentDatabase it's trowing "Not implemented" Exception for CurrentDatabase.

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• what is programming paradigm in haskell

  - by Pradeep

  im preparing for my exam. i got this question and i read several articles about this. but still i cant get a proper idea about this question what Paradigm means is that different programming styles ( as far as i think) in the question they ask explain it by taking two paradigms so this explanation should be done using two styles of programming "List Comprehnsions or Primitive Recursion, Higher order functions " is these styles are programming paradigms?? please help me

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• .net thread safety

  - by george9170

  Why is locking a type considered very bad? For example, lock(typeof(DateTime)) I understand that static methods of any class in .net is considered thread safe, and that instance members are not. So it isn't necessary to lock DateTime while you are using it. The book I am reading doesn't explain why it is bad it just says it is. Any explanation will be great.

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• Regex split into overlapping strings

  - by polygenelubricants

  I'm exploring the power of regular expressions, so I'm just wondering if something like this is possible: public class StringSplit { public static void main(String args[]) { System.out.println( java.util.Arrays.deepToString( "12345".split(INSERT_REGEX_HERE) ) ); // prints "[12, 23, 34, 45]" } } If possible, then simply provide the regex (and preemptively some explanation on how it works). If it's only possible in some regex flavors other than Java, then feel free to provide those as well. If it's not possible, then please explain why.

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• Ambiguous function/constructor call in C#

  - by Ahmed Said

  The following code causes a compiler error, as it is ambiguous call but the problem if we use object instead of ArrayList no error happens and the string version works fine; Do you have an explanation for that? class A { public A(string x) { Console.WriteLine("string"); } public A(ArrayList x) { Console.WriteLine("ArrayList"); } } static void Main(string[] args) { A o = new A(null); }

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• Validating String Characters as Numeric w/ Pascal (FastReport 4)

  - by user2525015

  I'm new to Pascal and FastReport. This question can probably be answered without knowledge of FastReport. Pascal is Delphi. FastReport4. I have a text box accepting an 8 character string as input. Each character should be numeric. I'm attempting to validate each character as numeric. I've tried using the val function... Procedure Val(S : String; var R: Real; Code : Integer); begin end; procedure thisinputOnChange(Sender: TfrxComponent); var S : String; error : Integer; R : Real; begin S := thisinput.lines.text; Val (S, R, error); If error > 0 then Button2.enabled := False; end; I got this code online. The explanation says that the function will return an error with a code greater than zero if the character cannot be converted to an integer. Is that explanation correct? Am I misinterpreting? Right now I am trying to set a button's enabled property to false if the validation fails. I might change that to a message. For now, I would like to get it to work by setting the button property. I'm not sure if I should be using the onChange event or another event. I'm also not sure if I need to send the input to the val function in a loop. Like I said, I'm just learning how to use this function. I am able to validate the length. This code works... procedure thisinputOnChange(Sender: TfrxComponent); begin if length(thisinput.lines.text) = 8 then Button2.enabled := True; end; Any suggestions? Should I use the val function or something else? Let me know if I need to provide more info. I might not be able to check back until later, though. Thanks for any help.

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• Why does Python output a string and a unicode of the same value differently?

  - by Thierry Lam

  I'm using Python 2.6.5 and when I run the following in the Python shell, I get: >>> print u'Andr\xc3\xa9' André >>> print 'Andr\xc3\xa9' André >>> What's the explanation for the above? Given u'Andr\xc3\xa9', how can I display the above value properly in an html page so that it shows André instead of André?

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• sql raiseerror error.number wrong in VB

  - by Melody Friedenthal

  I wrote a T-SQL query which includes a test for valid EmployeeNo. If the EmployeeNo is not valid, I do the following: RAISERROR(5005, 10, 1, N'Invalid Employee No') return @@Error Back in VB.Net I test the sql exception and found that when the Employee No is invalid the error.number is not 5005 as I would expect, but 2732. What is the explanation for this? Thank you.

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• Proper Commit Messages

  - by wowus

  What are commit messages for? I've always been writing them as an explanation of what I did, but I've recently gotten into a discussion about it with a colleague who writes commit messages explaining why he did. Which one is right, or is there another answer entirely?

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• Wait for function to finish before starting again.

  - by Matthew Brown

  Good Morning, I am trying to call the same function everytime the user presses a button. Here is what happens at the moment.. User clicks button - Calls function - function takes 1000ms+ to finish (due to animation with jQuery and AJAX calls) What I want to happen is every time the user presses the button it adds the function to the queue, waits for the previous call to finish, and then starts.. Is this possible? Sorry if my explanation is a bit confusing.. Thanks Matthew

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• ereg to preg conversion

  - by musoNic80

  I'm a complete novice when it comes to regex. Could someone help me convert the following expression to preg? ereg('[a-zA-Z0-9]+[[:punct:]]+', $password) An explanation to accompany any solution would be especially useful!!!!

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• semantics in perl

  - by clb

  i am new to perl and was asked to do a documentation on the semantics of perl.i did find some information but i cannot understand them.can some one explain it to me ion a simple way?a very simple explanation is enough.no need to go to deapth. explain how axiomatic,operatioonal and denotational semantics are implemented in perl thank you very much:)

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• Jboss Messaging JMS

  - by Gandalf StormCrow

  I successfully managed to send the message to queue name ReceiverQueue on my localhost Jboss server, how can I retrieve message I sent to it or how do I check if there is any messages in the queue if any retrieve them .. or can I get an explanation of some sort what is the best way to do this. Thank you

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• ViewData.* and TModel in asp.net MVC

  - by Quintin Par

  After a week of asp.net mvc2, I still haven’t understood the advantages of ViewData.model or rather how I can properly utilize Viewdata. Can some teach me how to use Viewdata properly? Also what’s TModel that’s associated with viewdata? How does one utilize TModel? The viewdata explanation in spark view engine talks about TModel and I couldn’t get a clue of how I can use it in my projects. Can someone help me?

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• What is the difference between a segmentation fault and a stack overflow?

  - by AruniRC

  For example when we call say, a recursive function, the successive calls are stored in the stack. However, due to an error if it goes on infinitely the error is 'Segmentation fault' (as seen on GCC). Shouldn't it have been 'stack-overflow'? What then is the basic difference between the two? Btw, an explanation would be more helpful than wikipedia links (gone through that, but no answer to specific query).

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• What is a formal programming language?

  - by Orjanp

  Hello! What does it mean that a programming language is a formal programming language? And which languages are formal programming languages? And which are informal programming languages? I haven't found a good explanation yet.

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