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• How to start competitive programming?

  - by Vaibhav Agarwal

  I am practicing coding for a while but the problem is that it takes me a lot of time to write a solution for the problems. I want to ask if competitive programming can help me in improving this? If yes, then how should I start and from what site like TopCoder? I would obviously won't be able to solve very hard problems for now. What should I do? If no, what else should I do? I also have another problem that I want to learn coding but the thing is that I feel that I am not very good at it. What should I do? It's like bugging me from inside. I know some people may not find this question informative but please at least allow me to get an answer.

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• What are the downsides of implementing a singleton with Java's enum?

  - by irreputable

  Traditionally, a singleton is usually implemented as public class Foo1 { private static final Foo1 INSTANCE = new Foo1(); public static Foo1 getInstance(){ return INSTANCE; } private Foo1(){} public void doo(){ ... } } With Java's enum, we can implement a singleton as public enum Foo2 { INSTANCE; public void doo(){ ... } } As awesome as the 2nd version is, are there any downsides to it? (I gave it some thoughts and I'll answer my own question; hopefully you have better answers)

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• EBS Procurement - Approval Workflow

  - by Annemarie Provisero

  ADVISOR WEBCAST:  Approval Workflow PRODUCT FAMILY: EBS Procurement    February 15, 2011 at 14:00 UK Time, 9:00 am ET, 4:00 pm, Egypt Standard Time, 7:30 pm, India Time This one-hour session is recommended for technical and functional users who would like to know about APPROVAL WORKFLOW TROUBLESHOOTING. TOPICS WILL INCLUDE: Introduction Purchasing Approval Basics How to See the Workflow for a Purchasing Document Advanced Troubleshooting Helpful My Oracle Support Notes Conclusion A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services.  Click here to register for this session ------------------------------------------------------------------------------------------------------------- The above webcast is a service of the E-Business Suite Communities in My Oracle Support.For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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• Do Limited Wi-Fi Channels Restrict Network Availability?

  - by Jason Fitzpatrick

  Wi-Fi protocol supports 13 communication channels; how do these channels relate to the volume of devices you can have on the network and the quality of the connection? Read on learn more about Wi-Fi channel usage. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It How To Delete, Move, or Rename Locked Files in Windows

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• Will Unity allow users to change the color/appearance of the top-Panel?

  - by Sam

  I'm very excited by the functional design principles and keyboard shortcuts that are being implemented for Unity. And function of use is more important to me than looks. However, after experiencing the aesthetic beauty of the display of the top panel in gnome-shell, I was wondering if users would be able to alter the color of Unity's top panel? IMHO it does not look as good as the gnome-shell implementation (or mac OS X/iPad). I think if an alternate color/appearance were chosen for the panel, it would make a big difference aesthetically. Is there a way to make it Black like gnome-shell? Or are the color choices limited to theme-designs as pointed out in this answer? For efficiency and clarity, the Panel should be better differentiated from application controls. The panel should be a different color because it has a "constant (always present) state," unlike application controls. For contrast and easy-recognition, I would like to make the Panel black (like gnome-shell) but make the application controls (e.g., those of Firefox) "Inverted"

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• Immutable Method Java

  - by Chris Okyen

  In Java, there is the final keyword in lieu of the const keyword in c and c++. In the latter languages their is mutable and immutable methods such as stated in one answer by Johannes Schaub - litb the question how-many-and-which-are-the-uses-of-const-in-ce Use const to tell others methods won't change the logical state of this object. struct SmartPtr { int getCopies() const { return mCopiesMade; } }ptr1; ... int var = ptr.getCopies(); // returns mCopiesMade and is specified that to not modify objects state. How is this performed in Java?

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• What are the IEEE and ACM good for?

  - by Joshua Fox

  Membership in the IEEE and ACM is sometimes portrayed as a sign of professionalism. But all that is involved, as far as I can tell, is sending them your money. In return, besides the potential resume line, these organizations sponsor conferences and journals. I can always attend a conference or subscribe to or submit a paper to a journal, whether I am a member or not. If being a member makes some of that cheaper, or is a prerequisite for admission then OK, but I still don't see the purpose of these organizations. The answer, as far as I can gather, is that their most important value is to provide some reading material. I'd suggest that this is not worth the money given the wide availability of other valuable reading materials.

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• Can Dust Actually Damage My Computer?

  - by Jason Fitzpatrick

  Thousands of hours per year of fan-driven air movement combined with electrostatic charges make computers veritable dust magnets. Is all that dust simply a nuisance or is it actually harmful? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It?

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• Good sites for sharing code snippets & pastes that you can share links to?

  - by acidzombie24

  I know there are site tools to check if your webpage is alive, has compression, etc but lets not get into that. What are useful sites to paste code in and to share links to it? The three i know are http://codepad.org/ shows source and runs code online http://www.pastie.org/ share source with syntax highlighting http://jsfiddle.net/ great for JS help or for the occasional test. What else do you know of? One answer per question. I'll let lints and validators slide since you do paste code into them. Mention a weakness if you do know one so others wont be surprised or disappointed.

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• Would you use UML if it kept stakeholders from requesting changes frequently?

  - by Huperniketes

  As much as programmers hate to document their code/system and draw UML (especially, Sequencing, Activity and State machine diagrams) or other diagramming notation, would you agree to do it if it kept managers from requesting a "minor change" every couple of weeks? IOW, would you put together visual models to document the system if it helped you demonstrate to managers what the effect of changes are and why it takes so long to implement them? (Edited to help programmers understand what type of answer I'm looking for.) 2nd edit: Restating my question again, "Would you be willing to use some diagramming notation, against your better nature as a programmer, if it helped you manage change requests?" This question isn't asking if there might be something wrong with the process. It's a given that there's something wrong with the process. Would you be willing to do more work to improve it?

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• Screen Lag/Running Slow

  - by Nick M

  I am having trouble with Ubuntu 12.10. Everything is working fine, although there is a slight problem. It seems to lag every once in a while, as in I will move the mouse, then about two seconds later the cursor will actually move on the screen. Is there any way to fix this? This is my first day using Ubuntu and I put it on a computer I built myself. I don't have much experience so a detailed answer would be very much appreciated.

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• Future of a ServiceStack based Solution in the Context of Licensing

  - by Harindaka

  I just want someone to clarify the following questions as Demis Bellot had announced a couple of weeks ago that ServiceStack would go commercial. Refer link below. https://plus.google.com/app/basic/stream/z12tfvoackvnx1xzd04cfrirpvybu1nje54 (Please note that when I say ServiceStack or SS I refer to all associated SS libraries such as ServiceStack.Text, etc.) If I have a solution already developed using ServiceStack today will I have to purchase a license once SS goes commercial even if I don't upgrade the SS binaries to the commercial release version? Will previous versions of SS (prior to commercial licensing) always be opensource and use the same license as before? If I fork SS today (prior to commercial licensing) on Github, would it be illegal to maintain that after SS goes commercial? If the answer to question 2 is yes, then would I still be able to fork a previous version after SS goes commercial without worrying about the commercial license (all the while maintaining and releasing the source to the public)?

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• Checking is sides of cubes are solid

  - by Christian Frantz

  In relation to this question: http://gamedev.stackexchange.com/a/28524/31664 And a question I asked earlier: Creating a DrawableGameComponent And also because my internet is too slow to get on chat. I'm wondering how to check if the sides of a cube are solid. I've created 12 methods, each one creating indices and vertices for sides of a cube. Now when I use these methods, the cube creates how it should. All 6 sides show up and its like I didnt change a thing. How can use if statements to check if the side of a cube is solid? The pseudocode from the question above shows this: if(!isSolidAt(x+1,y,z)) verticesToDraw += AddXPlusFace(x,y,z) But in my case is would be: if(!sideIsSolid) SetUpFrontFaceIndices(); My method simply takes these index and vertex values and adds them to a list indicesToDraw and verticesToDraw, as shown in the answer above

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• design pattern for unit testing? [duplicate]

  - by Maddy.Shik

  This question already has an answer here: Unit testing best practices for a unit testing newbie 4 answers I am beginner in developing test cases, and want to follow good patterns for developing test cases rather than following some person or company's specific ideas. Some people don't make test cases and just develop the way their senior have done in their projects. I am facing lot problems like object dependencies (when want to test method which persist A object i have to first persist B object since A is child of B). Please suggest some good books or sites preferably for learning design pattern for unit test cases. Or reference to some good source code or some discussion for Dos and Donts will do wonder. So that i can avoid doing mistakes be learning from experience of others.

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• Be a better programmer or an irreplacable employee?

  - by mahen23

  Before I worked for a web development company, I asked a lot of questions of friends who were working as developers for tips about being good at your job. One answer I got was: "Always make the employers beg for your competencies. Prove to them that you are the best and you cannot be replaced. While keeping the status quo, hold your employers hostage where if one day they remove your from the job or task, no one else will be able to do your job." How true is this statement?

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• Global menu not showing in Ubuntu 12.10 with Unity

  - by William

  I am on Ubuntu 12.10 with Unity shell. I am not quite sure what happened, but today I noticed that the menubar (containing 'File, Edit, etc...') is not appearing on the panel as it used to (i.e. the global application menu), but on the application window under the title bar. The only application that still uses global menu is Chromium. Any ideas what settings may have changed? Also, when I right click on the desktop and select "Change Desktop Background", System Settings opens, instead of the "Appearance" settings. Apparently, here is a related question, with no answer: Global menu and HUD suddenly broken EDIT: I noticed this behavior on three of my computers after an update (I do not remember exactly which packages were updated). Now when I try to run apt-get upgrade, I get: The following packages have been kept back: gnome-control-center gnome-control-center-data I guess something is going on with updates. Any info would be appreciated.

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• Hands-On Course Requirement: Applicability

  - by Paul Sorensen

  Hi Everyone,Recently there has been some confusion regarding the need for partner-related candidates to meet the hands-on course requirement for tracks that require it. I thought it would be wise to clarify this point on the blog. A recurring question that we have been getting is:Question: Do partner candidates need to meet a hands-on course requirement?Answer: Yes. In order for a person to become certified they must meet the certification requirements for the track that they are pursuing (as listed on the Oracle certification web site). Regardless of candidate type - partner, customer, employee, etc. - all of the certification requirements for a track must be met. Partner-related certification candidates must therefore meet the hands-on course requirement if the track requires it (i.e. they are not exempt from any of the requirements for any given certification).Thanks!QUICK LINKSOracle certification web siteHands-on Course Attendance Requirements

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• Is there a shell-independent search tool like the Unity's Dash?

  - by Bucic

  The only thing I will miss after moving to LXDE from Unity will be the Unity Dash. Its functionality, not the piss-poor performance that is. So here's my question. I know there is synapse but AFAIK it only returns text, without multiple large-sized thumbnails of files etc. ** I'm looking for a tool with thumb ailing capability. Immediate presentation of recently used files and apps is also a must.** Please don't be afraid of the NO answer. Related question: Any search tool for LXDE menu?

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• Should I provide fallbacks for HTML5/CSS3 elements in a web page at this point?

  - by Abluescarab

  I'm wondering if I should bother providing a fallback for HTML5 tags and attributes and CSS3 styling at this point in time. I know that there's probably still a lot of people out there who use older versions of browsers and HTML5/CSS3 are still fairly new. I read this article: Should I use non-standard tags in a HTML page for highlighting words? and one answer mentioned that people kind of "cheat" with older browsers by using the new tags and attributes, but styling them in CSS to ensure they show up right. This question: Relevance of HTML5: Is now the time? was asked about two years ago and I don't know how relevant it is anymore. For example, I want to use the placeholder and required attributes in a web form I'm building and it has no labels to show what each <input> is. How do I handle this, or do I bother?

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• Google not recognizing microdata? [duplicate]

  - by user1795832

  This question already has an answer here: How long for data highlighter mark up to appear in structured data tool? 2 answers I put in microdata to one page of a site I help manage using schema.org. Using the Google webmaster tool test, the page checks out and displays what it sees as the microdata properly. But when I go to the Structured Data page in webmaster tools, it keeps saying the site does not have any. I put it in 2 weeks ago. Us it just something that take a while for it to recognize? Or does microdata have to be on every page for it to be recognized or something?

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• What php programmer should know?

  - by emchinee

  I've dig the database here and didn't found any answer for my question. What is a standard for a php programmer to know? I mean, literally, what group of language functions, mechanisms, variables should person know to consider oneself a (good) php programmer? (I know 'being good' is beyond language syntax, still I'm considering syntax of plain php only) To give an example what I mean: functions to control http sessions, cookies functions to control connection with databases functions to control file handling functions to control xml etc.. I omit phrases like 'security' or 'patterns' or 'framework' intentionally as it applies to every programming language. Hope I made myself clear, any input appreciated :) Note: Michael J.V. is right claiming that databases are independent from language, so to put my question more precisely and emphasise differences: Practises or security, are some ideas to implement (there is no 'Pattern' object with 'Decorator()' method, is there?) while using databases means knowing a mysqli and a set of its methods.

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• Dell Inspiron touchpad not working

  - by Bobby

  I own a Dell Inspiron on which I installed 12.04 on. Everything was working great up until a couple of weeks ago when the Touchpad stopped working. It doesn't show up in mouse/touchpad settings either. I was wondering if anyone has had the same problem with 12.04 and was able to fix it. I am a noob when it comes to computer code and stuff like that, so please try to keep the answer noob proof. Also, does anyone know if the guys behind Ubuntu will have an update to fix this problem?

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• GConf Error: No D-BUS daemon running?! How to reinstall or fix?

  - by v2r

  After installing Konquerer and restarting my laptop i got the following error while trying to open, edit or access files as root from within Terminal (which is existencial for me). root@linuxBox:/home/v2r# gnome-open /home/ (gnome-open:2686): GConf-WARNING **: Client failed to connect to the D-BUS daemon: //bin/dbus-launch terminated abnormally with the following error: No protocol specified Autolaunch error: X11 initialization failed. GConf Error: No D-BUS daemon running root@linuxBox:/home/v2r# No protocol specified Could not parse arguments: Cannot open display: Also it seems, that dbus is not installed properly anymore in /bin/ and /usr/bin/ See screenshot: How would i go about fixing this problem and thank you in advance?!!! Thank you for your answer SirCharlo! It does not resolve the problem at all. Please note, that it only happens while beeing root! root@linuxBox:/home/v2r# gnome-open /home/ (gnome-open:5170): GConf-WARNING **: Client failed to connect to the D-BUS daemon: Failed to connect to socket /tmp/dbus-2RdCUjrZ9k: Connection refused GConf Error: No D-BUS daemon running root@linuxBox:/home/v2r# No protocol specified Could not parse arguments: Cannot open display:

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• Is there a phrase or word to describe an algorithim or programme is complete in that given any value for its arguments there is a predictable outcome?

  - by Mrk Mnl

  Is there a phrase to describe an algorithim or programme is complete in that given any possible value for its arguments there is a predicatable outcome? i.e. all the ramifications have been considered whatever the context? A simple example would be the below function: function returns string get_item_type(int type_no) { if(type_no < 10) return "hockey stick" else if (type_no < 20) return "bulldozer" else return "unknown" } (excuse the dismal pseudo code) No matter what number is supplied all possibiblites are catered for. My question is: is there a word to fill the blank here: "get_item_type() is ______ complete" ? (The answer is not Turing Complete - that is something quite different - but I annoyingly always think of something as "Turing Complete" when I am thinking of the above).

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• Transformation matrix that maps a window

  - by gbhall

  I'm currently learning OpenGL at uni, and they give us questions to help us learn (these are not worth anything), however I'm stuck on this one question and would have to travel over an hour and a half to uni for an answer. How do I do this question? Please include as many steps as you can, I want to be able to follow exactly how to do this. Find the transformation that maps a window whose lower left corner is at (1,1) and upper right corner is at (3,5) onto: The entire device screen whose dimension is (600, 500) A viewport that has lower left corner at (100,100) and upper right corner at (400,400) Edit: Damn sorry I should have added I am meant to find the matrix, so no code.

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