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  • Is there any algorithm that can solve ANY traditional sudoku puzzles, WITHOUT guessing (or similar techniques)?

    - by justin
    Is there any algorithm that solves ANY traditional sudoku puzzle, WITHOUT guessing? Here Guessing means trying an candidate and see how far it goes, if a contradiction is found with the guess, backtracking to the guessing step and try another candidate; when all candidates are exhausted without success, backtracking to the previous guessing step (if there is one; otherwise the puzzle proofs invalid.), etc. EDIT1: Thank you for your replies. traditional sudoku means 81-box sudoku, without any other constraints. Let us say the we know the solution is unique, is there any algorithm that can GUARANTEE to solve it without backtracking? Backtracking is a universal tool, I have nothing wrong with it but, using a universal tool to solve sudoku decreases the value and fun in deciphering (manually, or by computer) sudoku puzzles. How can a human being solve the so called "the hardest sudoku in the world", does he need to guess? I heard some researcher accidentally found that their algorithm for some data analysis can solve all sudoku. Is that true, do they have to guess too?

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  • How is an AppDelegate instanciated?

    - by pwny
    I have an iOS application for which I want to create a ViewController programmatically. I started an empty XCode project and modified the main method so it looks like this int main(int argc, char *argv[]) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, @"MyAppDelegate_iPad"); [pool release]; return retVal; } The app is a Universal Application, MyAppDelegate_iPad is a subclass of MyAppDelegate, which is a subclass of NSObject <UIApplicationDelegate>. My problem is that the applicationDidFinishLoading method I've overridden in MyAppDelegate_iPad is never called (break point on the first line never hits). The method looks like this -(void) applicationDidFinishLaunching:(UIApplication *)application { window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; if(!window) { [self release]; return; } window.backgroundColor = [UIColor whiteColor]; rootController = [[MyViewController alloc] init]; [window addSubview:rootController.view]; [window makeKeyAndVisible]; [window layoutSubviews]; } I removed the line to link to a nib file from my plist file (I used to get the default "My Universal app on iPad" white screen) and now all that is displayed is a black screen. applicationDidFinishLoading is still not being called. Am I doing something wrong? How should I properly create my AppDelegate instance?

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  • Is std::move really needed on initialization list of constructor for heavy members passed by value?

    - by PiotrNycz
    Recently I read an example from cppreference.../vector/emplace_back: struct President { std::string name; std::string country; int year; President(std::string p_name, std::string p_country, int p_year) : name(std::move(p_name)), country(std::move(p_country)), year(p_year) { std::cout << "I am being constructed.\n"; } My question: is this std::move really needed? My point is that compiler sees that this p_name is not used in the body of constructor, so, maybe, there is some rule to use move semantics for it by default? That would be really annoying to add std::move on initialization list to every heavy member (like std::string, std::vector). Imagine hundreds of KLOC project written in C++03 - shall we add everywhere this std::move? This question: move-constructor-and-initialization-list answer says: As a golden rule, whenever you take something by rvalue reference, you need to use it inside std::move, and whenever you take something by universal reference (i.e. deduced templated type with &&), you need to use it inside std::forward But I am not sure: passing by value is rather not universal reference?

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  • Do I lose anything by coding in c# and using free online vb.net code convertors?

    - by Gullu
    The company I work for uses vb.net since there are many programmers who moved up from vb6 to vb.net. Basically more vb.net resources in the company for support/maintenance vs c#. I am a c# coder and was wondering if I could just continue coding in c# and just use the many online free c# to vb.net code convertors. That way, I will be more productive and also be more marketable since there are more c# jobs compared to vb.net jobs. I have done vb6 many years ago and I am comfortable debugging vb.net code. It's just the primary coding language. I am more comfortable in c#. Will I lose anything if I use this approach. (code conversion). Based on what i read online the future of vb.net is really "Dim". Please advise. thank you

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  • How to build a game like HaxBall?

    - by Cengiz Frostclaw
    I'm a coder interested in game development, and I want to build a very simple p2p (real time) game. The perfect example for this is haxball. The client/server model doesn't matter, it could be like haxball (i.e. the room creator is the host) or changing host, or the server is host (if there is such a thing) I just want to learn the basics to create a field where players can move their characters in real time. So where should I start? Please guide me into the right direction. And with examples please. I found out that RTMFP does what I seek, but how do I use it? I know ActionScript 3.0, but no idea how to setup a multiplayer game. Please help ! Thanks in advance.

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  • Project Management, Developer being project managers manager

    - by marabutt
    I am in the planning stages of a project and am looking to hire a project manager. I want be doing some coding and keeping an eye on all parts of the project but feel a project manager will get better results than I could. I can project manage the project and not code and hire another coder or code myself and hire a project manager. I am worried that the project manager will fell impeded by having the project owner as part of the development team. If I run the project, the team might fall apart causing the project to fail. To stick within budget, I have to be involved in one capacity or another. Does anyone have experience with this situation or suggestions?

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  • Best PHP-based web development 'stack' of 2011

    - by Jens Roland
    I have been building PHP-based web sites for many years, and lately it seems I'm discovering another interesting new tool or method once every few weeks. This begs the question - what is the current state of the art in PHP development stacks for the seasoned coder? I'm specifically interested in the following: High-performance web server Database MVC framework Build tool Revision control Continuous Integration Automated testing Non-persistent caching I'd like to optimize my stack for scalability and rapid development. I'm not looking for personal preference here, I'm looking for real, quantifiable reasons to pick this-over-that.

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  • SOLVED - 'srcDomainMulti' is not declared. It may be inaccessible due to its protection level

    When converting a project from C# to VB I ran into this compiler error which stopped me in my tracks for about 15 minutes. Just when I gave up and decided to rebuild the page by hand inspiration hit and I found my solution... The scenario I had just put the finishing touches to a domain whois tool and I was ready to convert it over to a VB project. I'm not a very strong VB.net coder but the project required the final deliverable in VB so I opted to make it all in C# first and then convert it over...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • GWB | Contest Standings as of May 17th, 2010

    - by Staff of Geeks
    I want to officially let everyone know the 30 posts in 60 days contest has started.  The current standings as as followed for those in the “Top 10” (there are twelve due to ties now).  For those who don’t know about the contest, we are ordering custom Geekswithblogs.net t-shirts for those members who post 30 posts in the 60 days, starting May 15th, 2010.  The shirts will have the Geekswithblogs.net logo on the front and your URL on the back.    Top 12 Bloggers in the 30 in 60 Contest Christopher House (4 posts) - http://geekswithblogs.net/13DaysaWeek Robert May (3 posts) - http://geekswithblogs.net/rakker Stuart Brierley (3 posts) - http://geekswithblogs.net/StuartBrierley Dave Campbell (2 posts) - http://geekswithblogs.net/WynApseTechnicalMusings Steve Michelotti (2 posts) - http://geekswithblogs.net/michelotti Scott Klein (2 posts) - http://geekswithblogs.net/ScottKlein Robert Kokuti (2 posts) - http://geekswithblogs.net/robertkokuti Robz / Fervent Coder (2 posts) - http://geekswithblogs.net/robz Mai Nguyen (2 posts) - http://geekswithblogs.net/Maisblog Mark Pearl (2 posts) - http://geekswithblogs.net/MarkPearl Enrique Lima (2 posts) - http://geekswithblogs.net/enriquelima Frez (2 posts) - http://geekswithblogs.net/Frez I will be publishing updates throughout the contest on this blog.  Technorati Tags: Contest,Geekswithblogs,30 in 60

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  • Best Free software for hosting user guides

    - by Hippyjim
    Hi All After having to clean up spam from a MediaWiki install for the umpteenth time, despite a recaptcha plugin "preventing" automated signups, I'm wondering if MediaWiki is the right choice as a CMS for hosting user manuals and guides. I've always loved the way wikis can let the guides be edited and commented on collaboratively, but I'm getting tired of dealing with automated vandals. I've disabled edits & signups for now, but as I'm having to go through the pain of cleaning thousands of junk pages, I'm beginning to think I should cut my losses and look for a better alternative. Does anyone know of suitable a FOSS application (preferably PHP / MySQL based) that would be simple for a non-coder (our manual writer) to edit, but that has all the interconnectivity, and searchability of a wiki? Or should I just bite the bullet again and lock the wiki down even further?

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  • Working as Test Engineer and looking to move into Identity Management Technology. Possible?

    - by Aditi Bhatnagar
    I have been working as Test Engineer for past 2.5 year. The project is related to Identity Management and I am in love with the technology. I want to move into the same field. I don't aim to be a hard core coder but rather an analyst or an IDM architect. Is it realistically possible to do so? I see some possible issues, since the field is fairly new in India and for the time being I don't have coding/deployment experience at all. If it is nonetheless possible to switch into this new technology, what kind of effort I have to put in? What are the possible steps that you can suggest to try this switch?

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  • Do I need a degree in Computer Science to get a junior Programming job?

    - by t84
    Do I need to go to Uni to get a job as a Junior C# coder? I'm 26 and have been working in Games (Production) for 6 years and I am thinking of a change, I've had exposure to VB6, VBA, HTML, CSS, PHP, JavaScript over the past few years and did a web design NCFE at College, but other than that, nothing else! I'm teaching myself C# at the moment with books and I was wondering 'how much' I need to learn and also how I can improve my chances of getting a programming job! Am I a late started to learn coding? (I know many people who started at a very young age!) Thanks for the help :)

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  • How to convincing Programmers that 'being in the zone' [coding] isn't always beneficial for the project?

    - by hawkeye
    In this book review: http://books.slashdot.org/story/11/06/13/1251216/Book-Review-The-Clean-Coder?utm_source=slashdot&utm_medium=twitter Chapter 4 talks about the coding process itself. One of the hardest statements the book makes here is to stay out of "the zone" when coding. Bob asserts that you lose parts of the big picture when you go down to that level. While I may struggle with that assertion, I do agree with his next statement that debugging time is expensive, so you should avoid having to do debugger-driven development whenever possible. He finishes the chapter with examples of pacing yourself (walking away, taking a shower) and how to deal with being late on your projects (remembering that hope is not a plan, and being clear about the impact of overtime) along with a reminder that it is good to both give and receive help, whether it be small questions or mentoring others. they talk about how 'being in the zone' - can actually be detrimental to the project. How do you convince your team members that this is the case?

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  • Do I need a degree in Computer Science to get a Jr Programming job in the world? [closed]

    - by t84
    As above really, do I need to go to Uni to get a job as a Junior C# coder? I'm 26 and have been working in Games (Production) for 6 years and I am thinking of a change, I've had exposure to VB6, VBA, HTML, CSS, PHP, JavaScript over the past few years and did a web design NCFE at College, but other than that, nothing else! I'm teaching myself C# at the moment with books and I was wondering 'how much' I need to learn and also how I can improve my chances of getting a programming job! Am I a late started to learn coding? (I know many people who started at a very young age!) Thanks for the help :)

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  • Why do I have to choose between "management" and "technical" tracks in my career?

    - by Stephen Gross
    I was recently laid off, and although I found a new gig I'm a bit frustrated with how career tracks work in the land of software development. I really love doing a bit of everything: coding, testing, architect(ing), leadership/management, customer contact, requirements gathering, staff development, etc. Software companies, however, want me to fit into a niche: I'm either a coder, a tester, or a manager. When I try to explain to them that I'm best when I'm doing all of those at once, they seem very confused. I'm sympathetic to their interests, but at the same time frustrated that the industry works this way. Any advice? Do I just need to get with the program, so to speak?

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  • Would you make your website's source code public?

    - by Karpie
    Back story: My best friend is a self-taught coder for a community art site, written in PHP. Some time ago he mentioned he wanted to make the source code of the site public, to which my response was total horror - surely it was going to be full of security holes waiting to be found, and it was going to lead to hacking and errors on a huge scale. He never ended up doing it. Current story: I'm starting development of a community website built in Rails, and for ease of use I was going to use Github for version control. Then I realized it was pretty much exactly the same thing as my friend making his source code public - which made me stop and think. Would you make your website's completely-custom source code public? Or is this a case of open source gone too far? (note: I don't think this applies to people who run things like Wordpress. Or does it?)

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  • template for terms of condition for social media based website?

    - by Rubytastic
    Im looking for a template for a terms of usage text based on social media websites. Im actually a coder and not into the legal blabla in general. Ofcourse you could spend a thousand or 2 on a lawyer but just a 3/4 paper text shoulder;t be to hard to compile yourself with some help. Im not sure if this is the right spot to ask this question but I love stack overflow and none of the sites in stack exchange I could find matched better then this one. My first idea lets look at some social media websites and grab some of there text, rewrite it for own specific usage Are there templates on writing such document Same goes with a privacy policy actually.

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  • The clean coders videos [closed]

    - by Sebastian
    As many others, I have been reading Uncle Bob Martins books. More specifically, clean code and then "the clean coder". Now, over the last year he has been producing "code casts" that you can buy for ~20USD a piece. I bought the first episode sometime in mid 2011 and wasnt that impressed, as I really learned nothing new after reading his books. Last night I bought the first episode of test driven development with more or less the same result as last time. Now tonight I gave it one more go and bought TDD part 2 and this one was, IMO, really good. With this post I would like to tip others about his videos and would also like to know what others think. BR Sebastian

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  • Unity 3D coding language, C# or JavaScript [on hold]

    - by hemantchhabra
    Hello to the gaming community. I am a budding game designer, learning to code for the first time in my life. I did learned c++ in school, 8 years back, so I sort of understand the logic when people are doing coding and I can suggest them the right route also, but to an extent I can't code. I am beginning to learn coding for Unity 3D. Which one do you suggest is more versatile and easier to work on for future, because I am a game designer not a coder, I would do coding until I don't have anyone else to code for me. It should be easy and fast to learn, functional and universal to apply, and innovative at the same time. C# or JavaScript ? Thank you for your time Ps- if you could suggest me steps to learn and tutorials to look for, that would be just awesome.

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  • Avoiding duplicate bug reports

    - by Jaakko Seppälä
    I use Linux and other open source software in my home. As I'm not a professional coder, I usually report bugs to developers as my skills are not enough to solve problems on my own. What kind of things you want me to check before I send a bug report? I mean, once I thought I found a bug in Gedit and I couldn't find similar bug in Bugzilla. But after I sent the report, some developer said that the bug is already in Bugzilla as the bug was in GTK+, not in Gedit. Sometimes it might be hard for an amateur to guess whether some previously known bug would solve the issue I found.

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  • Suggestions on Calculating Advertising Rates [closed]

    - by Jonathan Wood
    Possible Duplicate: How do I set a price for advertising on my website? I recently launched a new developer website, Black Belt Coder. The site is only seeing about 150 visitors per day but, given that it's only been live two months, I feel I'm off to a good start. I'd like to start monetizing the site as soon as possible but consider AdSense and other programs largely a waste of time. I'd like to deal directly with the advertisers but have no idea what to charge. Are there any guidelines for determining advertising rates based on visitors or page views? I don't expect to do PPC. I want to charge a the time period for banner ads, knowing that advertisers will be keeping an eye on the number of clicks.

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  • What's the best way to get up to speed with Java?

    - by Kosta
    I'm a software developer that just switched teams so I shall write code in Java now. Last time I wrote something in the language was in programming 101 at uni (I was already an amateur coder back then). So what is the best book/tutorial to get up to speed with Java? Where's the Java - the good parts? Learn you some Java for great good? Learn Java the hard way? Or is it too enterprisey for that kind of passion...?

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  • Just being hired as a senior developer, never even been a junior developer, what should I expect?

    - by Mark James
    I've been a freelancer and a coder by night for a while, and recently, I've been hired after several levels of interviews in a nice NY company, even though I've some lacks in specific fields. Is this common for companies to hire seniors with less experience? Will they wait some weeks to respect a certain learning curve? I don't know anything about working in a company, so that's why I worry. After one week, I'm still checking and exploring sources, but after one week of work, it seems that some coworkers are considering that I'm slow. I'm good in maths, physics, algorithms, but still I need to learn about all the templates used in this company. Anyone here already received a less-experienced senior member in his team? Is this acceptable? I'm planing on having a meeting with my boss to stop worrying about that. Sounds like a good idea?

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  • View Frustum Alternative

    - by Kuros
    I am working on a simulation project that requires me to have entities walking around in a 3D world. I have all that working, matrix transformations, etc. I'm at the point where I need what is essentially a view frustum, so I can give each entity a visible area. However, when looking over the calculations required to do it, it seems like a perspective frustum is only required to be able to project it onto a 2D screen. Is there another, easier to code solution, that would function better, such as an orthogonal perspective? Could I just define a shape mathematically and test wether the coordinates of the objects are inside or out? I am not really a 3D coder (and I am doing this all from scratch, not using an engine or anything), so I would like the simplest solution possible for my needs. Thank you!

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  • I'm Sick of Web Development - What avenues are open to me ...?

    - by 5arx
    I've been working as a web developer since 1998, mostly with ASP/ASP.Net/C# but began as a Java coder (JSP mostly). Its been fun but now I'm feeling jaded and can see the need for a change. I've considered iOS/Cocoa development and Android development recently (Objective-C looks hard while I'm a former Java developer) but I'm not sure of Career opportunities being proficient in either would afford The incline of the learning curve - I just turned 40 and I know I'm not as sharp or as quick as I once was. Does anyone have any experiences/ opinions/ advice for me? Thanks.

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