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List of fundamental data structures - what am I missing?

- by jboxer

I've been studying my fundamental data structures a bunch recently, trying to make sure I've got them down cold. By "fundamental", I mean the real basic ones. Fancy ones like Red-Black Trees and Bloom Filters are clearly worth knowing, but they're usually either enhancements of fundamental ones (Red-Black Trees are binary search trees with special properties to keep them balanced) or they're only useful in very specific situations (Bloom Filters). So far, I'm "fluent" in the following data structures: Arrays Linked Lists Stacks/Queues Binary Search Trees Heaps/Priority Queues Hash Tables However, I feel like I'm missing something. Are there any fundamental ones that I'm forgetting about? EDIT: Added these after posting the question Strings (suggested by catchmeifyoutry) Sets (suggested by Peter) Graphs (suggested by Nick D and aJ) B-Trees (Suggested by tloach) I'm a little on-the-fence about whether these are too fancy or not, but I think they're different enough from the fundamental structures (and important enough) to be worth studying as fundamental.

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Changing the color of a Rebol button

- by Dave Matuszek

I want to ask multiple choice questions in Rebol. Possible answers will be on buttons. I want to turn a button red when it is clicked and it is the wrong answer. When the correct button is pressed, I want to proceed to the next question. I can change the color of a box (mybox/color: red show mybox). I can set up a toggle with two colors (but I can't change it based on the result of an arbitrary test (is the answer correct?). It seems like there is probably a simple way to change the color of a button, without having to create my own button-like face objects. Isn't there?

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Color blindness: Are you aware of it? Do you design for it?

- by User

I'm curious whether many of us who do design or take design decisions have ever heard of this problem. I'm aware there are dangerous color combinations, like green + red. This is probably one of the most popular cases of color blindness. If you have green text on a red background and vice versa some people won't see anything. I've also seen in practice that green text on a blue background was not seen by one guy. What other color compositions should be avoided, and how often these cases are to be expected? Let us make some ranging by encounter probability who has the numbers. Addition: I've just remembered one very bad example that causes problems to just about everyone - blue text on a black background. It's unreadable for all intents and purposes. Never could understand what could possibly compel a web master to use this color combination...

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How to create a clip region from a path that includes the 'outline'?

- by mackenir

I am creating a rounded rectangle GraphicsPath (see red outline image below), and then using this as a clip region both when drawing graphics, and as the Region of a Form. Unfortunately, although the path looks good, it doesn't work well as a region (see solid black image below) Is there a way that I can generate a clipping region from the path that includes all the 'outline' pixels of the path? Do I need to generate a bitmap and then process this to create a region? The rounded rectangle path: When used as a clip region: The discrepancy (red pixels are in the path outline, but outside the region. blue pixels are in both):

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Isolate HTML Div from Javascript/CSS

- by Neb

Is there any way to isolate a div from the rest of the page javascript and css? Something like an iframe but without the iframe(because I dont want any extra requests to the server). Here is an example: <html> <head> <style> a{ color:red; } </style> </head> <body> <div> <----- I want the link inside here not to be red <a href="#">test</a> </div> </body> </html>

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Windows desktop gadget RSS Feed colour coding items

- by padjo

I have a desktop gadget that pulls RSS Feeds from a website. The Feed contains information about issues - ie. Priority, Time, Description. The Feed items are displayed on the desktop - however I need to colour code them according to their priority ie 1 = red etc. using the substr function - is there a better way to do this using JavaScript / HTML? At the moment I've hacked together this - but is there a more elegant solution? if (feed.item.description.substr(10,1) == "1") { document.write "<a href colour="red"" + item + ">"; else if (feed.item.description.substr(10,1) == "2") { document.write "<a href colour="yellow"" + item + ">"; else { document.write "<a href colour="green"" + item + ">";

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Best way to auto-restore a database every hour

- by aron

I have a demo site where anyone can login and test a management interface. Every hour I would like to flush all the data in the SQL 2008 Database and restore it from the original. Red Gate Software has some awesome tools for this, however they are beyond my budget right now. Could I simply make a backup copy of the database's data file, then have a c# console app that deletes it and copies over the original. Then I can have a windows schedule task to run the .exe every hour. It's simple and free... would this work? I'm using SQL Server 2008 R2 Web edition I understand that Red Gate Software is technically better because I can set it to analyze the db and only update the records that were altered, and the approach I have above is like a "sledge hammer".

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Can I find out which thread is running using Eclipse?

- by Roman

I close my application by pressing a "Close" button. But in the Eclipse I see a red square indicating that something is still running. When I press this red square, I kill my application completely. Is it possible to find out what is still running (which method, which loop) using Eclipse? P.S. I am a newbie. So, it would be nice to have a simple solution. I also might not understand your answer if you use "technical" words which I do not know.

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Float over two elements

- by eWolf

My problem is rather complex to explain, so I'll show you an example: http://ewolf.bplaced.de/misc/float.htm I want to have a floated element (the blue box) to be be placed over two other elements (red and green) and I want the whole thing to be fixed-width and centered (done by the box with the black border) while the background of the red and green box should fill the whole width. I'm actually not quite sure if the way I've done it now is XHTML/CSS valid, but it works - at least in Firefox. In IE6, the green box expands to fit the whole blue box - how can I fix this in IE6 or find another solution to show it correctly in all browsers?

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jquery hover menu question

- by vondip

Hi all, I am developing a small web app that uses jquery quite a lot. In my app a user can hover an image, which becomes bigger after a few seconds, giving him more details. The problem is that when the image enlarges the image, it takes over the area of the nearby images as well. Now, if the user goes over the second red square (numbered as 2) I would like the currently enlarged image to disappear and instead enlarge the image pictured below as square two. I am not much of a painter, but I have attached a small image to help illustrate the problem. In short, How can I tell jquery to detect when the mouse is over red square number two, yet not raising the event if the mouse is over green square. [in my demo picture, hovering on point]

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In PHP is faster to get a value from an if statement or from an array?

- by Vittorio Vittori

Maybe this is a stupid question but what is faster? <?php function getCss1 ($id = 0) { if ($id == 1) { return 'red'; } else if ($id == 2) { return 'yellow'; } else if ($id == 3) { return 'green'; } else if ($id == 4) { return 'blue'; } else if ($id == 5) { return 'orange'; } else { return 'grey'; } } function getCss2 ($id = 0) { $css[] = 'grey'; $css[] = 'red'; $css[] = 'yellow'; $css[] = 'green'; $css[] = 'blue'; $css[] = 'orange'; return $css[$id]; } echo getCss1(3); echo getCss2(3); ?> I suspect is faster the if statement but I prefere to ask!

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Object initializers not working in List<T>.

- by Jebli

List<Car> oUpdateCar = new List<Car>(); oUpdateCar.Add(new Car()); oUpdateCar[0].name = "Color"; oUpdateCar[0].value = "red"; oUpdateCar.Add(new Car()); oUpdateCar[1].name = "Speed"; oUpdateCar[1].value = "200"; The above code is working but i want to initialize it when i create the list as below, List<Car> oUpdateCar = new List<Car> { new Car{ name = "Color"; value = "red";} new Car{ name = "Speed"; value = "200";} } The above code is not working. What am i missing. I am using c# .NET 2.0. Please help.

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ActiveX doesn't show up in Browser

- by Boller

Hi, i'm trying to put an activeX object on an asp-webpage. it already worked good a week ago, but now the object isn't showing up anymore. already made a little asp testing-project....just an asp-page and a activex control, containing a button and a label. but when i call up the page in the browser, there is only a white area with a little icon in the upper left corner, showing a red dot, a green triangle and a blue rectangle.... what does that mean? object not found? object blocked by IE? or what exactly does this icon stand for? i always thoght that an missing object is represented by an empty area with a little red cross in it. =/

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Jquery row css problem

- by oraclee

Hi all; Html Code: <table> <tr> <td>test</td> </tr> </table> Jquery Code: $(document).ready(function(){ $('table tr:eq(0)').after('<tr><td>bla</td></tr>').css({'color':'red'}); }); i need after append add css <tr><td>bla</td></tr> >>> color red How to make ?

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Powershell Replace Regex

- by Brad

I have a select-string which is seaching an IIS log for a particular string and returning the 2 lines above and one line below. So results look like this: 2012-06-15 18:26:09 98.138.206.39 OutboundConnectionResponse SMTPSVC1 WEB10 - 25 - - 220+mta1083.sbc.mail.ne1.yahoo.com+ESMTP+YSmtp+service+ready 0 0 60 0 218 SMTP - - - - 2012-06-15 18:26:09 98.138.206.39 OutboundConnectionCommand SMTPSVC1 WEB10 - 25 EHLO - WEB10.DOMAINCOM 0 0 4 0 218 SMTP - - - - 2012-06-15 18:26:09 74.125.244.10 OutboundConnectionResponse SMTPSVC1 WEB10 - 25 - - 550+IP+Authorization+check+failed+-+psmtp 0 0 41 0 218 SMTP - - - - 2012-06-15 18:26:09 74.125.244.10 OutboundConnectionCommand SMTPSVC1 WEB10 - 25 RSET - - 0 0 4 0 218 SMTP - - - - Note the third line begins with denoting thats the line that select-string matched upon. I am trying to do a -replace on the to replace it with < font color="red"$1< /font but my replace doesn't seem to work. Here's my code: $results = $results -replace "(^ )(.*)$", "< font color='red'$1< font" Can any powershell regex guru's out there tell me why my regular expression isn't matching? Thanks Brad

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SQL Query Help Please

- by DaveC

Hello, I have an addition SQL question, hopefully someone here can give me a hand. I have the following mysql table: ID Type Result 1 vinyl blue, red, green 1 leather purple, orange 2 leather yellow and i am seeking the following output: ID Row One Row Two 1 vinyl blue, red, green leather purple, orange 2 leather yellow the thing is... type is not static... there are many different types and not all of them have the same ones. They need to follow in order. Any help is greatly appreciated.

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Style all anchors except those that contain images, without adding class or id to the image tag?

- by Deca

With the example below, I need to add padding and background-color properties to the text anchor. I then need to exclude padding and background-color from anchors that contain images. <p> <a href="#">this is a text link that needs to be styled</a> <a href="#"><img src="image/name.jpg" alt="this needs to be excluded from styling" /></a> </p> If I have a red background and padding on my text links, I do not want that same red background and padding to appear on my linked images. The images will always be in their own anchors, not mixed with text within the same anchor. The rub is that I can not add classes or IDs to the img tags - I do not have edit control of that data. So how can I add CSS attributes to all anchors, while excluding anchors that contain images?

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how to add a color to a line in sharepoint 2007 list that has a specific text ?

- by gadym

hello there, I would like to know how to add a color to a line in sharepoint 2007 list if in one field there is a specific text contained ? for example : I have a list that have three fields: list1 1.id 2.name 3.full description now i want to show only the first and the second field to the user. list1 id name 1 abc 2 edv second thing, i want to give a color (let say red) to a row that contains in the hidden field - "full description", a text with the word for example 'color'. I found a javascript code that i can add to the aspx page : (document).ready(function(){ $Text = $("td .ms-vb2:contains('color')"); $Text.parent().css("background-color", "red"); }); but it's only works if the the "full description" is shown. can someone give me an idea ? thanks, gadym

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Flex Panel Content Background Color

- by Jerry

Hello guys. I am trying to set the gradient background color for my panel via skins. I try to change my code but nothing seems to change. Not sure what to do. Thanks for any reply. My skin file / <s:Rect id="background" left="1" top="1" right="1" bottom="1"> <s:fill>  <s:SolidColor id="backgroundFill" color="red"/> //Change to red but //nothing happen.... </s:fill> </s:Rect>

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SQL Query Question ROW_CONCAT

- by DaveC

Hello Guy, I have been stuck on this problem for quite awhile... I hope someone out there can give me a hand. The following table is in my database: Product_ID Color Type 1 Red Leather 1 Silver Metal 1 Blue Leather 2 Orange Metal 2 Purple Metal I am trying to get the following output: Product_ID Type Color 1 Leather Red, Blue 1 Metal Silver 2 Metal Orange, Purple I know it has to do with some kind of double group by and a group_concat.... have been looking at this for an hour without figuring it out. Any help is much appreciated!!!

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Global variables that can be used in multiple jQuery functions

- by YouBook

Can you be able to contain variables that can be used in multiple functions in jQuery, example: var self = $(this); var box = self.parents('.box'); $('#title').click(function() { self.css('background', 'red'); box.slideDown('slow'); }).dblclick(function() { self.css('background', 'green'); box.slideUp('slow'); }); So that self and box can be used within these event functions so I don't have to keep doing this: $('#title').click(function() { var self = $(this); var box = self.parents('.box'); self.css('background', 'red'); }).dblclick(function() { var self = $(this); var box = self.parents('.box'); self.css('background', 'green'); }); But question is, is it possible, if so, how can you do that?

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How To Query Many-to-Many Table (one table's values becomes column headers)

- by CRice

Given this table structure, I want to flatten out the many-to-many relationships and make the values in the Name field of one table into column headers and the quantities from the same table into column values. The current idea which will work is to put the values into a Dictionary (hashtable) and represent this data in code but im wondering if there is a SQL way to do this. I am also using Linq-to-SQL for data access so a Linq-to-SQL solution would be ideal. [TableA] (int Id) [TableB] (int id, string Name) [TableAB] (int tableAId, int tableBId, int Quantity) fk: TableA.Id joins to TableAB.tableAId fk: TableB.Id joins to TableAB.tableBId Is there a way I can query the three tables and return one result for example: TableA [Id] 1 TableB [Id], [Name] 1, "Red" 2, "Green" 3, "Blue" TableAB [TableAId], [TableBId], [Quantity] 1 1 5 1 2 6 1 3 7 Query Result: [TableA.Id], [Red], [Green], [Blue] 1, 5, 6, 7

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Python modules import error

- by Choor

Very strange for me: # uname -a Linux localhost.localdomain 2.6.18-194.3.1.el5 #1 SMP Thu May 13 13:09:10 EDT 2010 i686 i686 i386 GNU/Linux # pwd /root # python Python 2.6.5 (r265:79063, Apr 11 2010, 22:34:44) [GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on linux2 Type "help", "copyright", "credits" or "license" for more information. import dns [3]+ Stopped python # cd /home/user/dev/dns [root@localhost dns]# python Python 2.6.5 (r265:79063, Apr 11 2010, 22:34:44) [GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on linux2 Type "help", "copyright", "credits" or "license" for more information. import dns Traceback (most recent call last): File "", line 1, in File "dns.py", line 1, in import dns.resolver ImportError: No module named resolver [4]+ Stopped python # Summary: I can't import same python module from different path. Any ideas? 0_o P.S. SELINUX=disabled

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Can we paint a JTable cell partially?

- by Harish

Is it possible to paint a JTable cell alone partially?Like 40% of it is green remaining is red?

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SQL Find duplicate sets

- by Aheho

given this Schema: table tblSET SetID int PK SetName nvarchar(100) Table tblSetItem SetID int PK ItemID int PK tblSetItem.SetID is a FK into the tblSet Table. Some data: tblSet SetID SetName 1 Red 2 Blue 3 Maroon 4 Yellow 5 Sky tblSetItem SetID ItemID 1 100 1 101 2 100 2 108 2 109 3 100 3 101 4 101 4 108 4 109 4 110 5 100 5 108 5 109 I'd like a way to identify which sets contain the same items. In the example above Red and Maroon contain the same items (100,101) and Blue and Sky contain the same values (100,108,109) Is there a sql query which would provide this answer?

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