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• Algorithm for finding all paths in a NxN grid

  - by Periastron

  Imagine a robot sitting on the upper left hand corner of an NxN grid. The robot can only move in two directions: right and down. How many possible paths are there for the robot? I could find solution to this problem on Google, but I am not very clear with the explanations. I am trying to clearly understand the logic on how to solve this and implement in Java. Any help is appreciated. Update: This is an interview question. For now, I am trying to reach the bottom-right end and print the possible paths.

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• SQL Check Constraint cannot reference other column

  - by user1777711

  I trying to add this sql check in ALTER TABLE School add Role check_role CHECK (check_role IN ('Teaching Assistant', 'Lecturer', 'Professor')); I get the error below ERROR at line 3: ORA-02438: Column check constraint cannot reference other columns SQL> desc School; Name Null? Type ----------------------------------------- -------- ---------------------------- STAFFNUM NOT NULL VARCHAR2(12) NAME NOT NULL VARCHAR2(50) ADDRESS NOT NULL VARCHAR2(300) DOB DATE I am trying add a column call Role, with the check constraint check_role I am using Oracle SQL. Thanks for all help!

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• Python finding repeating sequence in list of integers?

  - by tijko

  I have a list of lists and each list has a repeating sequence. I'm trying to count the length of repeated sequence of integers in the list: list_a = [111,0,3,1,111,0,3,1,111,0,3,1] list_b = [67,4,67,4,67,4,67,4,2,9,0] list_c = [1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,0,23,18,10] Which would return: list_a count = 4 (for [111,0,3,1]) list_b count = 2 (for [67,4]) list_c count = 10 (for [1,2,3,4,5,6,7,8,9,0]) Any advice or tips would be welcome. I'm trying to work it out with re.compile right now but, its not quite right.

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• Image upload not functioning correctly

  - by PurpleSmurf

  I'm still trying to get to grips with PHP, and I'm trying to make a form that uploads a picture to a database. I don't have permissions for move_uploaded_file so I'm using the copy() as an alternative. Everywhere I've seen experiencing similar problems have all been with move_uploaded_file so I'm rather stuck. Trying to copy the image from the desktop doesn't seem to be working, it's not throwing up any more PHP errors but is displaying the error message for if something goes wrong. The form sends data to two tables in the database but I'm mainly concerned with the upload not working. There's over 200 lines so I'll post a snippet of the upload code, thank you in advance: function getExtension($str) { $i = strrpos($str,"."); if (!$i) { return ""; } $l = strlen($str) - $i; $ext = substr($str,$i+1,$l); return $ext; } //This variable is used as a flag. The value is initialized with 0 (meaning no error found) and it will be changed to 1 if an errro occures. If the error occures the file will not be uploaded. $errors=0; //checks if the form has been submitted if(isset($_POST['submitted'])) { //reads the name of the file the user submitted for uploading $image=$_FILES['image']['name']; //if it is not empty if ($image) { //get the original name of the file from the clients machine $filename = stripslashes($_FILES['image']['name']); //get the extension of the file in a lower case format $extension = getExtension($filename); $extension = strtolower($extension); //if it is unknown extension, class as an error and do not upload the file, otherwise continue if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) { //print error message echo '<h1>Unknown extension!</h1>'; $errors=1; } else { //get the size of the image in bytes //$_FILES['image']['tmp_name'] is the temporary filename of the file in which the uploaded file was stored on the server $size=filesize($_FILES['image']['tmp_name']); //give an unique name, for example the time in unix time format $image_name=time().'.'.$extension; //the new name will be containing the full path where will be stored (images folder) $newname="/home/k0929907/www/uploads/".$image_name; //verify if the image has been uploaded, and print error instead $copied = copy($_FILES['image']['tmp_name'], $newname); if (!$copied) { echo '<h1>Copy unsuccessfull!</h1>'; $errors=1; } } } }

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• Python - 2 Questions: Editing a variable in a function and changing the order of if else statements

  - by Eric

  First of all, I should explain what I'm trying to do first. I'm creating a dungeon crawler-like game, and I'm trying to program the movement of computer characters/monsters in the map. The map is basically a Cartesian coordinate grid. The locations of characters are represented by tuples of the x and y values, (x,y). The game works by turns, and in a turn a character can only move up, down, left or right 1 space. I'm creating a very simple movement system where the character will simply make decisions to move on a turn by turn basis. Essentially a 'forgetful' movement system. A basic flow chart of what I'm intending to do: Find direction towards destination Make a priority list of movements to be done using the direction eg.('r','u','d','l') means it would try to move right first, then up, then down, then left. Try each of the possibilities following the priority order. If the first movement fails (blocked by obstacle etc.), then it would successively try the movements until the first one that is successful, then it would stop. At step 3, the way I'm trying to do it is like this: def move(direction,location): try: -snip- # Tries to move, raises the exception Movementerror if cannot move in the direction return 1 # Indicates movement successful except Movementerror: return 0 # Indicates movement unsuccessful (thus character has not moved yet) prioritylist = ('r','u','d','l') if move('r',location): pass elif move('u',location): pass elif move('d',location): pass elif move('l',location): pass else: pass In the if/else block, the program would try the first movement on the priority on the priority list. At the move function, the character would try to move. If the character is not blocked and does move, it returns 1, leading to the pass where it would stop. If the character is blocked, it returns 0, then it tries the next movement. However, this results in 2 problems: How do I edit a variable passed into a function inside the function itself, while returning if the edit is successful? I have been told that you can't edit a variable inside a function as it won't really change the value of the variable, it just makes the variable inside the function refer to something else while the original variable remain unchanged. So, the solution is to return the value and then assign the variable to the returned value. However, I want it to return another value indicating if this edit is successful, so I want to edit this variable inside the function itself. How do I do so? How do I change the order of the if/else statements to follow the order of the priority list? It needs to be able to change during runtime as the priority list can change resulting in a different order of movement to try.

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• LibGDX: transform Texture to TextureRegion

  - by FeRo2991

  I am creating a TowerDefence Game in LibGDX and am now trying to replace the old Tile with a new StaticTiledMapTile. But to create a StaticTiledMapTile I need a TextureRegion, not a Texture. Now I'm trying to create a TextureRegion, which contains the whole Texture, but it doesn't seem to work. It always appears distorted. I have tried the following: TextureRegion region = new TextureRegion(new Texture("someImg.png"), 0, 0, 32, 32); StaticTileMapTile tile = new StaticTiledMapTile(region); getLayer().getCell(x,y).setTile(tile); //setting the new tile In my opinion this should work (if the image, as it is, is 32px wide and 32px high).

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• Calling inheriting class methods via interface.

  - by Stacey

  Given the scenario... interface IBase{ void Process(int value); } abstract class Base : IBase { public virtual void Process(int value){ throw new NotImplementedException(); } } class Implemented: Base, IBase { public void Process(int value) { // .. some code here.. } } I'm trying to write a loop similar to the following. foreach( Base b in CollectionOfImplemented ) { b.Process( // something will go here // ); } Trying this, it keeps calling Base.Process, instead of Implemented.Process; but the type in the collection is Implemented, not Base. Boxing it seems to work, but I was hoping to see if I could find a more intelligent approach to it, since the Collection will contain other types of objects that also inherit from Base.

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• Hovering Div Shows a Hidden Div - Prototype

  - by phil

  I have three divs set up in the following way: <div class="outer-div"> <div class="inner1"></div> <div class="inner2" style="display:none;"></div> </div> I have the second inner div hidden via the inline style. What I am trying to accomplish is that when the outer div, or basically any of the content is hovered over then the inner2 would appear. I am unfamilar with Prototype and having a terrible time trying to get my head around it. Missing jQuery but this time around Prototype is totally required. Thanks in advance for any help!!

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• Play/pause HTML 5 video using JQuery

  - by Barny83

  I am trying to control HTML5 videos using JQuery. I have two clips in a tabbed interface, there are six tabs in total, the others just have images. I am trying to make the video clips play when their tab is clicked and then stop when any of the others are clicked. This must be a simple thing to do but I cant seem to get it to work, the code I am using to play the video is: $('#playMovie1').click(function(){ $('#movie1').play(); }); I have read that the video element needs to be exposed in a function to be able to control it but can't find an example. I am able to make it work using JS: document.getElementById('movie1').play(); Any advice would be great. Thanks

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• Can anyone would provide me a example of reference-based linked list?

  - by Max

  I'm trying to create a reference based linked list anyone would be able to provide me an example of it??

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• PHP session token can be used multipletimes?

  - by kornesh

  I got page A which is a normal HTML page and page which is an AJAX response page. And I want to prevent CSRF attacks by tokens. Lets say I use this method for an autocomplete form, is it possible to use same token multiple times (of course the session is only set one time) because i tired this method but the validation keep failing after the first suggestion (obviously the token has changed, somehow) page A <?php session_start(); $token = md5(uniqid(rand(), TRUE)); $_SESSION['token'] = $token; ?> <input id="token" value="<?php echo $token; ?>" type="hidden"></input> <input id="autocomplete" placeholder="Type something"></input> .... The form is autosubmitted every time theres a change using Jquery. page B <?php session_start(); if($_REQUEST['token'] == $_SESSION['token']){ echo 'Im working fine'; } ?>

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• How To Write Selenium Xpath

  - by user3690563

  I am Struck here. I am Trying a write Xpath for the Code in the image. I am Trying to click Browse TAB. Where the ID is changing every time. Help me guys. Thanks you in Advance I have tried this as my Xpath //*[@id='ext-gen43']/em/span/span <a id="ext-gen43" class="x-tab-right" href="#"> <em class="x-tab-left"> <span class="x-tab-strip-inner"> <span class="x-tab-strip-text ">Browse</span> </span> </em> </a>

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• Visual Website Optimizer and Code Igniter

  - by absentx

  We are trying to integrate visual website optimizer into a site of ours that uses Code Igniter. The problem is when we go into the VWO control panel to look at stats and previews nothing seems to be working. In the previews panel, all of them come up as code igniter error pages that say "The URI you submitted has disallowed characters." I have researched some solutions to this and have tried changing the regex in system/config to allow more characters, all characters etc and I am still having the problem. Any known issues or problems trying to integrate VWO and Code Igniter? This definitely seems to be a url issue but I can't nail it down.

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• mootools 1.11 .setHTML not working in IE

  - by moleculezz

  Hello, I am trying to make a form dynamic using mootools 1.11, for specific reasons I cannot upgrade atm. I'm trying to manipulate a select field to have dynamic options. This works in Firefox & Chrome but not IE8. Hope there's a fix for this. bits of the code: myOptions(hrs+1, 23, 'uur'); $('vertrektijd_uur').setHTML('<option value="">Kies uur</option>'+options_uur); $('vertrektijd_uur').addEvent('change', function() { hrsChanged = $('vertrektijd_uur').getValue(); hrsChanged = parseInt(hrsChanged); if(hrs+1 == hrsChanged) { myMinutes(parseInt(min)); myOptions(minChanged, 55, 'min'); $('vertrektijd_min').setHTML('<option value="">Kies minuten</option>'+options_min); } else { myOptions(0, 55, 'min'); $('vertrektijd_min').setHTML('<option value="">Kies minuten</option>'+options_min); } });

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• Basic iphone timer example

  - by Rob

  Okay, I have searched online and even looked in a couple of books for the answer because I can't understand the apple documentation for the NSTimer. I am trying to implement 2 timers on the same view that each have 3 buttons (START - STOP - RESET). The first timer counts down from 2 minutes and then beeps. The second timer counts up from 00:00 indefinitely. I am assuming that all of the code will be written in the methods behind the 3 different buttons but I am completely lost trying to read the apple documentation. Any help would be greatly appreciated.

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• Wordpress Custom Type permalink containing Taxonomy slug

  - by treznik

  I'm trying to create a permalink pattern for a Custom Type, that includes one of its taxonomies. The taxonomy name is known from the start (so I'm not trying to add or mix all of its taxonomies, just a specific one), but the value will by dynamic, of course. Normally, the Custom Type permalink is built using the rewrite arg with the slug param, but I don't see how I could add a dynamic variable in there. http://codex.wordpress.org/Function_Reference/register_post_type I'm guessing a custom solution is required, but I'm not sure what the best unintrusive approach would be. Is there a known practice for this or has anyone built something similar recently? I'm using WP 3.2.1 btw.

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• How to ask questions to an obstructionist?

  - by Rob Wells

  This is not related to my other recently posted question about "working with a star developer". In a similar vein, how do you work with someone who will only answer the specific question that you ask. I worked with someone who, when you asked a question on a specific aspect of the system, would give you the answer just related to the specific bit you'd asked about. For example, when processing radar messages I'd ask about an aspect of message number RJ546 and he would answer just about that specific part of RJ546. He wouldn't mention anything about the other freaky parts of the message, or mention any related aspects of the other messages. Then you'd go off and work on the processing and all of a sudden all this other freakiness would pop up. What's a good technique when working with this type of person? BTW I later found out that the person who I'd come in to replace had quit because he got sick and tired of having these surprises pop up due to the lack of information provided by this person. Edit: I forgot to add that the person was deliberately obstructionist and believed that job security came from hoarded knowledge not being disseminated.

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• Filtering across two ManyToMany fields

  - by KVISH

  I have a User model and an Event model. I have the following for both: class Event(models.Model): ... timestamp = models.DateTimeField() organization_map = models.ManyToManyField(Organization) class User(AuthUser): ... subscribed_orgs = models.ManyToManyField('Organization') I want to find all events that were created in a certain timeframe and find the users who are subscribed to those organizations. I know how to write SQL for this (it's very easy), but whats the pythonic way of doing this using Django ORM? I'm trying as per below: orgs = Organization.objects.all() events = Event.objects.filter(timestamp__gt=min_time) # Min time is the time I want to start from events = events.filter(organization_map__in=orgs) But from there, how do I map to users who have that organization as a subscription? I'm trying to map it like so: users = User.objects.filter(subscribed_orgs__in=...

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• A way to search form table in MySQL database.

  - by Eugene

  I looked for a way to scan database for a specific table. For example i have: Database: system_ultimate Table: system_settings And let us say, that one doesn't know precise name of the table. He only knows, that it is some how connected to word settings. How could he search for that table name then? I understand, that usually people who develop know, what they develop, but I'm trying to get hang of MVC and I'm trying to stay as far away as possible from direct communication with table using the name. I know, that to see all tables I could use SHOW TABLES;

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• running jar file with multiple arguments in perl

  - by compiler9999

  Hi All, Im trying to run a jar file. this jar file will output multiple question in console manner, i want to eliminate the console and i need to input a value in order to proceed. e.g : A. Choose value 1 : [1] Windows [2] Unix Input : 2 B. Choose value 2 : [1] Oracle [2] DB2 Input : 1 Im trying : "java -jar program.jar < abc.txt" where abc.txt has a value of : 2 1 3 etc. but its not working its only getting the first value. please help. thanks. btw, ive also try : OPEN PIPE, "| java -jar program.jar"; open (FH, /abc.txt) print PIPE "$res"; close FH; close PIPE; Regards

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• I am not able to inlcude NTDDk header!

  - by kiddo

  hello all,I am trying to include the header but its unreconized..Do I need to change any project settings..help me please!!

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• Rails - Sending XML or JSON

  - by timWhit

  I'm new to Rails and trying to send a request to Chargify to cancel a subscription. Their API says I need to send the method DELETE to a xml URL. This isn't a Chargify based question but rather... how would I have a user click a button that then generates this request and sends it within my Rails app? You can view this url to see what I"m trying to do - http://docs.chargify.com/api-subscriptions#cancel. Also it's working fine when I run a command-line test so I know my code works, just now sure how to put it into my Rails app (view/controller). Thanks

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• Purpose of front() and back() in assigning values in a Queue? (C++)

  - by kevin

  I have declared: queue<int, list<int> > Q After a series of calls: Q.push(37); Q.pop(); Q.push(19); Q.push(3); Q.push(13); Q.front(); Q.push(22); Q.push(8); Q.back(); I get: 19-3-13-22-8-NULL What I don't get is what the calls to Q.front() and Q.back() do. From what I understand, they return a reference to the first or last elements respectively, but I dont see how my list would be any different had those calls not been made. Do they have any effect? Sorry if this seems trivial, but I'm trying to figure out of those calls have a purpose, or of my professor is just trying to screw with me.

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• Sending some byte at time

  - by user1417815

  I'm trying to figure out way to send some amount of text from the string ech time until it reach the end of the string, example: const char* the_string = "hello world, i'm happy to meet you all. Let be friends or maybe more, but nothing less" Output: hello world Output: , i'm happy to meet you all. Output: Let be friends or maybe more Output: , but nothing less stop: no more bytes to send. the problem i have searched google, but didn't understand the examples, i spent 4 days trying find a good way, also that sendt 5 bytes at time, but in case there is less, then send them until you are at the end of the string. please help me out guys, i will accept a C or C++ way, as long it works and well explained.

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• How can I start XServer in Linux through apache user triggered by Perl script running in background?

  - by Nikhil

  I am trying to launch MS Office through WINE using a PERL script hosted by apache and and triggered by other application. I am getting the following error message in log files "Application trying to create a window but no driver could not be loaded. Make sure that your X server is running and that $DISPLAY is set correctly". If I run the script directly on shell prompt using root user then WINE starts XServer properly and execute MS MSoffice in addition to that if I set xhost +local:apache on shell prompt then also it works fine. How can I start the XServer from apache user?

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