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  • Small questions on data structure

    - by John Graveston
    Hi, I'm trying to search the parent of a node with Kruskal's algorithm. My program works just fine, but I think I have heard of a method to improve the speed of the algorithm by reconstructing the tree while searching for the parent node and connecting it to the parent node. I'm pretty sure that I've heard of this somewhere, maybe in a lecture. Can anyone refresh my memory? And also, given a number of arrays, when searching for the minimum and the maximum value from a certain section of an array, what is the name of the tree that can calculate the minimum/maximum value from the array by making a binary tree that has the minimum/maximum value of each array in O(log N)?

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  • Some questions about focus on WPF

    - by ThitoO
    Hello, I've a little problem about focus on WPF. I whant to create a window, always on top, and that never get the focus (even if we click on it). Here's my solution : public partial class SkinWindow : Window { public SkinWindow() { InitializeComponent(); Loaded += ( object sender, RoutedEventArgs e ) => SetNoActiveWindow(); } private void SetNoActiveWindow() { WindowInteropHelper helper = new WindowInteropHelper( this ); SetWindowLong( helper.Handle, GWL_EXSTYLE, WS_EX_NOACTIVATE ); LockSetForegroundWindow( LSFW_LOCK ); } const int GWL_EXSTYLE = -20; const int WS_EX_NOACTIVATE = 134217728; const int LSFW_LOCK = 1; [DllImport( "user32" )] public static extern bool LockSetForegroundWindow( uint UINT ); [DllImport( "user32" )] public static extern IntPtr SetWindowLong( IntPtr hWnd, int nIndex, int dwNewLong ); } First problem : It's works, but I've to select an other window to "remove" the focus of my application (after the focus is not gave again, even if I click on my window). Second problem : When I move or resize the window, the modifications happens when I drop the window. Do you have any ideas / links / docs ? Thank you :)

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  • database encryption questions

    - by 5YrsLaterDBA
    We are using Sybase SQL Anywhere 11. We need to encrypt some of our tables in our database. I followed the instruction and did it. We selected the "strong" option with encryptionKey and AES256_FIPS algorithm. But there are something I am not clear about them. It will require encryptonKey when we create the database, remove the database and start the database server but it will NOT require encryptionKey when we stop the database server and connect to the server to create tables and add data. Why there is NO encryptionKey asked when we connect to it or try to stop the server? I am doing something wrong? don't know how to test the encryption? I still can see all plain text in the encrypted tables when I use Sybase Central tool. If somebody knows the database user name and password, he/she can connect to the database and read the content without the encryptionKey. is this right?

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  • Very simple mod_rewrite questions

    - by Camran
    1- Does mod_rewrite means that if I make this url: domain.com/ad.php?id=8498292 INTO domain.com/8498292 that all links on my website will have to be changed to the later above? example the link: domain.com/ad.php?id=8498292 wont work now, unless I replace it with domain.com/8498292 ? Or will the server know that they are the same still? 2- Will the rewritten link appear rewritten in the browsers adress bars also, so if I enter domain.com/ad.php?id=8498292 it will actually appear as domain.com/8498292 in the adress bar itself? 3- Will images and all other related links and material on the page whose link is rewritten remain intact? ie will pictures and links still work FROM that page which are relative? Thanks

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  • 2 basic but interesting questions about .NET

    - by b-gen-jack-o-neill
    Hi, when I first saw C#, I thought this must be some joke. I was starting with programming in C. But in C# you could just drag and drop objects, and just write event code to them. It was so simple. Now, I still like C the most, becouse I am very attracted to the basic low level operations, and C is just next level of assembler, with few basic routines, so I like it very much. Even more becouse I write little apps for microcontrollers. But yeasterday I wrote very simple control program for my microcontroller based LED cube in asm, and I needed some way to simply create animation sequences to the Cube. So, I remembered C#. I have practically NO C# skills, but still I created simple program to make animation sequences in about hour with GUI, just with help of google and help of the embeded function descriptions in C#. So, to get to the point, is there some other reason then top speed, to use any other language than C#? I mean, it is so effective. I know that Java is a bit of similiar, but I expect C# to be more Windows effective since its directly from Microsoft. The second question is, what is the advantage of compiling into CIL, and than run by CLR, than directly compile it into machine code? I know that portability is one, but since C# is mainly for Windows, wouldn´t it be more powerfull to just compile it directly? Thanks.

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  • Makefile: couple syntax questions

    - by Michael
    package_version := $(version)x0d$(date) what is the x0d part between version and date vars? is it just string? What $(dotin_files:.in=) does below code dotin_files := $(shell find . -type f -name \*.in) dotin_files := $(dotin_files:.in=) what this means $(dotin_files:=.in) code $(dotin_files): $(dotin_files:=.in) $(substitute) [email protected] > $@ can target contain multiple files? what is the meaning of declaring target variable as PHONY? code .PHONY: $(dotin_files) In the regex replacement code below code substitute := perl -p -e 's/@([^@]+)@/defined $$ENV{$$1} ? $$ENV{$$1} : $$&/ge' what are $$ENV{$$1} and $$&? I guess it's Perl scope... thanks for your time

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  • mktime and date questions..

    - by mjboggess
    Hello SO! I am working on a small project and am playing with date() and mktime() in PHP. Compare the two code blocks and their output, notice the second sample adds one to the month in it's first mktime. $monthis = 5; echo date('F', mktime(0,0,0,$monthis,0,0)) . " 1, 2010 is on a " . date("l F", mktime(0, 0, 0, $monthis, 1, 2010)); puts out April 1, 2010 is on a Saturday May but if I change it to $monthis = 5; echo date('F', mktime(0,0,0,$monthis + 1,0,0)) . " 1, 2010 is on a " . date("l F", mktime(0, 0, 0, $monthis, 1, 2010)); puts out May 1, 2010 is on a Saturday May Why do I have to add one to the month in the first mktime so that both emit the same month? Any help or clarity would be appreciated. Thanks :)

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  • Singleton rule questions (do not allow to create copy and deserialization)

    - by Petr
    Hi, Reading some article about singleton, I stopped at the point saying: "Do not allow to crate copy of existing instance". I realized that I do not know how would I do that! Could you tell me, please, how could I copy existing instance of class? And the second one: deserializaition. How it could be dangerous? And for both - how to deny creating copies or deserialization? Thanks

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  • Questions regarding databases MS Access [on hold]

    - by user2977751
    Good day! I am using MS Access 2007. I was wondering, how can I link a specific item on a table to another item in another table? For example, if I search for a particular product, all the suppliers of that product will be displayed. I want to connect my supply field to different suppliers field in different tables so that when I search for a particular supply, all the suppliers for that supply will be shown. And if it is also possible to link the records into a pre-set template in excel. THANKS!

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  • Two quick Mathematica questions

    - by sciguy
    How do I remove the numbers on the x-axis only not the y-axis? Is it possible to shift the y-axis without shifting the functions? What I mean is, instead of having the y-axis at x = 0, could I have it at x = -5?

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  • C++ help and questions

    - by user267237
    I need help making an c++ program with a function that uses int Disc(int A, int B, int C) and calculates returns B*B-4*A*C and use the function Disc in the program..... i have this so far. void main(){ cout << Disc(a,b,c); }

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  • Where can I ask web design questions of a more amateur nature?

    - by Warren van Rooyen
    I don't want to bother pro web designers with simple questions as I see most of the questions here are quite technical. An example would be, 'I have a template I've downloaded. The folder contains a css folder and PHP files. How would I bring this into Dreamweaver?' It's unfortunately in a space between what I'd be able to find on Google and asking here without feeling like a hinderance for those who don't want to answer such simple questions. Thanks, Warren.

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  • "Je suis un ingénieur, pas un compilateur", les questions d'entretiens sont-elles trop orientées vers la maîtrise des instructions et concepts ?

    « Je suis un ingénieur, pas un compilateur » les questions d'entretiens sont-elles trop orientées vers la maitrise des instructions et concepts des langages De nos jours, les offres d'emplois sont de plus en plus orientées vers des langages bien définis. Conséquence : les questions d'entretiens abordent beaucoup plus les aspects liés aux concepts du langage. C'est en tout cas le constat d'un développeur au pseudo de clements, dans un billet de blog intitulé « je suis un ingénieur, pas un compilateur ». Celui-ci s'est rendu compte lors de plusieurs entretiens que des questions standards comme : qu'est-ce que le polymorphisme ? Quelle est la différence entre « List » et « S...

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  • Can Questions be Reopened After They've Been Closed by Some Self Appointed Gestapo Moderators? [migrated]

    - by GenericJam
    This is obviously begging to be shut down right away and have all my privileges revoked or whatever but why do some people feel they have the right to shut down legitimate discussion? Who decides what is a "real" question or topic of interest? If you don't think it's valid, just click somewhere else but it is really getting to me on this site and StackOverflow how many really useful questions are shut down because people are asking opinions not textbook facts. Questions like this one are genuinely useful. Don't shut them down. You are making this site less useful for everyone else. Do people get their kicks by just wandering around the site closing questions? It seems many of the same names appear on the "closed down" box. Just go to a different page, don't ruin everyone else's education the way they choose it.

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  • An interview question

    - by maddy
    Hi, The questions shown below is an interview question Q)You are given have a datatype, say X in C. The requirement is to get the size of the datatype, without declaring a variable or a pointer variable of that type, And, of course without using sizeof operator ! I am not sure if this question was asked before in SO. Thanks and regards Maddy

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  • What is "null pointer assignment error"?

    - by sharptooth
    One of job interview questions on C pointer here is the following: what is null pointer assignment error? I've googled for a while and don't see any reasonable explanation. What is that? Trying to write through a null pointer? Something architecture- or environment-specific? What exactly is that error?

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