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  • How do we know the correct moves of Tower of Hanoi?

    - by Saqib
    We know that: In case of iterative solution: Alternating between the smallest and the next-smallest disks, follow the steps for the appropriate case: For an even number of disks: make the legal move between pegs A and B make the legal move between pegs A and C make the legal move between pegs B and C repeat until complete For an odd number of disks: make the legal move between pegs A and C make the legal move between pegs A and B make the legal move between pegs B and C repeat until complete In case of recursive solution: To move n discs from peg A to peg C: move n-1 discs from A to B. This leaves disc n alone on peg A move disc n from A to C move n-1 discs from B to C so they sit on disc n Now the questions are: How did we get this two solutions? Only by intuition? Or by logical/mathematical computation? If computation, how?

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  • Code snippets in interview

    - by Maddy
    Hi All, Recently I went to an interview for a C development position. Instead of asking me questions, they just gave me 20 code snippets to find out two logical errors on each one. I just couldn't complete all of the 20 since it took me time to go through each of these code snippets. My question is: Is this the right way to judge a candidate? If yes, how can I improve over my error detection skills so that I don't need to waste a lot of time in the next interview? If possible, please, suggest me some links where I could find lots of samples of such questions (mainly in C). Thanks and regards, Maddy

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  • Nesting forms in CakePHP

    - by Erik
    I am wondering if there's a way in CakePHP to nest multiple models in a form? What I'm trying to accomplish is to make a form for creating Posts that will also contain fields for adding Images (separate model) that will automatically be connected to the created post. Something similar to Ruby on Rails ** accept_nested_attributes_for**.

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  • ruby search drop down

    - by cesia
    I have a drop down list of Type in my Products model. I want to be able to search in the Products index.html.erb so a user selects a type from a drop down list, clicks search and all the products matching that type are returned. I can get normal search methods working where the user enters in their search in a text box but I cannot get it working when they just select from a dropdown. Can anyone help?

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  • How to increment a value using a C-Preprocessor in Objective-C?

    - by mystify
    Example: I try to do this: static NSInteger stepNum = 1; #define METHODNAME(i) -(void)step##i #define STEP METHODNAME(stepNum++) @implementation Test STEP { // do stuff... [self nextFrame:@selector(step2) afterDelay:1]; } STEP { // do stuff... [self nextFrame:@selector(step3) afterDelay:1]; } STEP { // do stuff... [self nextFrame:@selector(step4) afterDelay:1]; } // ... When building, Xcode complains that it can't increment stepNum. This seems logical to me, because at this time the code is not "alive" and this pre-processing substitution stuff happens before actually compiling the source code. Is there another way I could have an variable be incremented on every usage of STEP macro, the easy way?

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  • How can I detect if an iPhone OS device has a proximity sensor?

    - by Batgar
    The docs related to proximity sensing state that if the proximity sensing APIs are used on a device without a proximity sensor (i.e. iPod touch, iPad) they will just return as if the proximity sensor has fired. Aside from checking the [[UIDevice currentDevice].model] string and parsing for "iPhone", "iPod touch", or "iPad" is there a slicker way to determine if a proximity sensor is on a given device?

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  • Position of object in database

    - by fl00r
    Hi! I have got model Team and I've got (i.e.) team = Team.first :offset => 20. Now I need to get number of position of my team in db table. I can do it in ruby: Team.all.index team #=> 20 But I am sure that I can write it on SQL and it will be less expensive for me with big tables.

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  • Overriding an ActiveRecord attribute

    - by jspooner
    I have a model with a completed:boolean column that I'd like override so I can add some conditional code. I've never override an ActiveRecord attribute before and wanted to know if the method below is good practice? class Article < ActiveRecord::Base def completed=(b) write_attribute(:completed, b) # IF b is true then do something end end

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  • Scaffold is ignoring class file in CakePHP

    - by JoseMarmolejos
    Hi, when using scaffolding on a controller the views render fine and the app even attempts to insert the data; the problem is that the scaffold is completely ignoring the relations I'm defining in my model class, in fact it's ignoring the class entirely as I can delete the file and the controller still scaffolds and render the crud from the table. Has this ever happened to you?

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  • How can I override the attribute assignment in an active record object?

    - by ryeguy
    I know you can do this with virtual attributes, but what if the column actually exists? For example, my model has a raw_topic column. When raw_topic is set, I want artist and song_title to be set based off of raw_topic's contents. Ideally, I'd like to override the raw_topic= method, but rails doesn't seem to like that. What's the proper way of doing this? Is a callback the only way?

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  • Should I be using callbacks or should I override attributes?

    - by ryeguy
    What is the more "rails-like"? If I want to modify a model's property when it's set, should I do this: def url=(url) #remove session id self[:url] = url.split('?s=')[0] end or this? before_save do |record| #remove session id record.url = record.url.split('?s=')[0] end Is there any benefit for doing it one way or the other? If so, why? If not, which one is generally more common?

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  • Django 5 star Reviews

    - by firststepofthejourney
    Hello All, I am new to programming and I just jumped in to Django and I need a bit of help. I downloaded the generic reviews model off of Google code and I have no clue how to implement it. Can anyone pass along some guidance on how to make this work with a 5 star ratings system? I would appreciate it. Thanks.

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  • PHP codinh in real world

    - by user261002
    I know how to write program in PHP and implementation of MVC model. but I really want to practice coding like the coding in real world??? I was wondering is there any specific example or book which can show me the tricks or logic and the way professional programmers consider about coding???

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  • Oracle sequence but then in MS SQL Server

    - by Raymond
    In Oracle there is a mechanism to generate sequence numbers e.g.; CREATE SEQUENCE supplier_seq MINVALUE 1 MAXVALUE 999999999999999999999999999 START WITH 1 INCREMENT BY 1 CACHE 20; And then execute the statement supplier_seq.nextval to retrieve the next sequence number. How would you create the same functionality in MS SQL Server ? Edit: I'm not looking for ways to automaticly generate keys for table records. I need to generate a unique value that I can use as an (logical) ID for a process. So I need the exact functionality that Oracle provides.

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  • rails: running a method on create only

    - by bandhunt
    I want to run a paperclip method on create only has_attached_file :file This method doesn't seem to accept the :on = :create that some other rails methods do. I tried: before_create after_create etc, but those didn't work. I also did: if :create How can I test if the controller is using the create method from the model? Thanks!

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  • Learning Objective-C 2.0 and ASP.NET 4.0 simultaneously?

    - by Sahat
    (HOBBY) I own a Macbook Pro and iPod Touch so developing iPhone/iPod/iPad apps seems like a logical thing to do in order to get some experience in the programming field. Besides I want to write a new application similar to the Capsuleer (Character skills monitor app for EVE Online MMO) but with more features. It's something I'd love to have on my own iPod Touch and I am sure other people will welcome a new EVE Online app for their iPhone or iPod Touch. (CAREER) I want to learn ASP.NET (and possibly Silverlight later on) for my potential future job. I plan to work in the .NET field, so it's a good idea for me to start learning C# and ASP.NET ASAP. Is it a good idea to learn completely unrelated technologies at the same time? Or would it be better to learn one thing at a time? Objective-C first, and ASP.NET second. Or vice versa. Thanks, Sahat

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  • iPhone UI: No edit button for UITableView, bad idea?

    - by Nic Hubbard
    I have a UITableViewController which lets the user drill down into different records. On the second level/view, the user can add and edit new records. But, I am not sure what to do, since the back button is on the top left, and I need to put the "Add" button on the top right, so there is no room (keeping to HIG) for the edit button, which would normally go where the back button is. (I am using a tab bar, so can't put it at the bottom.) Do you think that it is logical, to expect users to know to swipe to delete a record? Or, do I need to have an edit button? If I DO need an edit button, where should I put it if I am following HIG?

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  • get renamed file names of multiple upload form [js array] in codeigniter

    - by artmania
    Hi friends, I use codeigniter. I have a multiple image upload form. The code below is working well for uploading, but I also need to save file names to database. How can I get the names in here? I spent hours & hours :/ but could not sort it :/ Appreciate helps!!! uploadform.php echo form_open_multipart('gallery/upload'); <input type="file" name="photo" size="50" /> <input type="file" name="thumb" size="50" /> <input type="submit" value="Upload" /> </form> I have a controller between form view and model load model (of course : )) but didnt post here because of no need. gallery_model.php function multiple_upload($upload_dir = 'uploads/', $config = array()) { /* Upload */ $CI =& get_instance(); $files = array(); if(empty($config)) { $config['upload_path'] = realpath($upload_dir); $config['allowed_types'] = 'gif|jpg|jpeg|jpe|png'; $config['max_size'] = '2048'; } $CI->load->library('upload', $config); $errors = FALSE; foreach($_FILES as $key => $value) { if( ! empty($value['name'])) { if( ! $CI->upload->do_upload($key)) { $data['upload_message'] = $CI->upload->display_errors(ERR_OPEN, ERR_CLOSE); // ERR_OPEN and ERR_CLOSE are error delimiters defined in a config file $CI->load->vars($data); $errors = TRUE; } else { // Build a file array from all uploaded files $files[] = $CI->upload->data(); } } } // There was errors, we have to delete the uploaded files if($errors) { foreach($files as $key => $file) { @unlink($file['full_path']); } } elseif(empty($files) AND empty($data['upload_message'])) { $CI->lang->load('upload'); $data['upload_message'] = ERR_OPEN.$CI->lang->line('upload_no_file_selected').ERR_CLOSE; $CI->load->vars($data); } else { return $files; } /* ------------------------------- Insert to database */ // problem is here, i need file names to add db. // if there is already same names file at the folder, it rename file itself. so in such case, I need renamed file name :/ } }

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  • Disable link with the prototype observe method...

    - by enyo
    I want to create a link like this: <a href="http://example.com">text</a> and replace the behavior so that the link downloads the content with Ajax instead when clicking. It is important for me not to replace the href attribute (so copying the link still works). One solution would be to do: $('link').onclick = function() { return false; }; but I would like to use the .observe method. But this doesn't work: $('link').observe('click', function() { return false; }); (which is quite logical). Any ideas on how I could achieve this? Thanks.

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  • How to make Subversion use Linux system accounts for authentication?

    - by Alejandro García Iglesias
    Hi all, I've set up a Ubuntu Server for Subversion with Apache/WebDAV interface to share repositories with other developers. My question is, how can I make Subversion use the linux system accounts for authentication? This would lead to very easy Subversion account management. Subversion with Apache/WebDAV is currently working with this configuration: Contents of /etc/apache2/mods-available/dav_svn.conf: <Location /svn> DAV svn SVNParentPath /home/svn SVNListParentPath On AuthType Basic AuthName "Subversion Repository" AuthUserFile /etc/apache2/dav_svn.passwd Require valid-user </Location> I have tried changing AuthUserFile /etc/apache2/dav_svn.passwd with AuthUserFile /etc/shadow with no success. This makes the server to respond with a error 500 internal server error. It's logical, why the Web service should have access to system authentication file? Thanks a lot in advance!

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