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• How to prove worst-case number of inversions in a heap is O(nlogn)?

  - by Jacques

  I am busy preparing for exams, just doing some old exam papers. The question below is the only one I can't seem to do (I don't really know where to start). Any help would be appreciated greatly. Use the O(nlogn) comparison sort bound, the theta(n) bound for bottom-up heap construction, and the order complexity if insertion sort to show that the worst-case number of inversions in a heap is O(nlogn).

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• In Emacs, how can I see which slime version is being used?

  - by Michiel Borkent

  I just upgraded my slime using elpa in Emacs. But I wonder if things are like they should be now, because when I removed the old version using elpa, it complained it could not remove a certain folder. So, when I start up Emacs (I know, I shouldn't have closed it), how I can see which slime version actually gets used? Is there a command like M-x slime-version ?

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• How do you copy VB6 user settings/preferences from one PC to another?

  - by Clay Nichols

  Where are all of the VB6 user preferences (like custom edits to the toolbar, etc.) stored? I'd like to copy all of those from an old PC to my new one.

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• How can I make my password fields always empty?

  - by ggfan

  I have a form field where users can change their passwords, but if they set their settings to remember passwords, their password shows up. Is there a way to make the field always empty? So that they always have to type their password. <label for="oldpassword" class="styled">Old password:</label> <input type="password" id="oldpassword" name="oldpassword"/><br />

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• C#, why does Convert.ToBoolean("0") fail?

  - by JL

  I know that trying to convert string "0" to boolean will fail, I also know how to fix this, thanks to Jon Skeets answers on other questions. What I would like to know is WHY does C# not recognise "0" as a valid input for a boolean conversion, surely you could look at it like 0 = false, 1 = true, or even -1 = false and 0 = true, anyways, my logic tells me that it could be a valid input, so is there a very good reason why its not? My bet is old vb6 would be able to recognize the string input "0" as valid.

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• What are the relevant classes / frameworks when I want to write / read stuff to / from disk?

  - by mystify

  Which classes / frameworks must I look at? I don't want to use 3rd party libs, so just plain old, boring default solutions to read / write text files and stuff like that... Is there something like a File IO framework?

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• snmp and platform specific information

  - by reza

  I need to come with a strategy to use gather information about the health of my linux platform, hardware health such as high CPU temperature and may be disk space usage, etc... I know my examples are not very good ones. Essentially, I have an SNMP agent running on Linux and I need it to provide platform specific health and state information. Are there any Linux packages that do this, what MIBs to use, Dell Open Manager functionality??? Any thoughts and comments are appreciated.

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• Prompting for user confirmation before upgrading previous version

  - by bizmark

  Using WiX, we would like to be able to uninstall a previous version if it is already installed. I am able to do this automatically based on the thread here. But how does one go about prompting the user if they actually want to uninstall the old version first, before running the RemoveExistingProducts action? ie. through a custom menu item that only launches if FindRelatedProducts returns 1, for example?

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• Operating System Development

  - by j-t-s

  Hi All I'm looking for any website(s) devoted and/or related to Operating System Development, and would love for you to kindly share any links you may have. I have searched myself, but keep winding up at the same old sites, and am wondering if there are others that just don't get noticed by the major search engines or something. I've put this as a community wiki, simply because I don't think it's very fair to judge an answer based on a single link. Thank you.

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• perforce connect history of two different files

  - by dacwe

  Hi everyone! I have a problem, in a refactoring attempt I have copied files from one place to another and added them in my scm (perforce). When I was done and everything was working I deleted the old (moved) files. Can I connect the file histories with each other? The best would be to se the "move" like it should have been done.. Thankful for any help!

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• {Microsoft CRM 4.0} How to send e-mail to some users who has salesperson security role.

  - by erdogan uslu

  Hi, I created a workflow . My workflow sends e-mails to users who has salesperson security role. But I have big problem. After I export and import customizations in different company users of old company are shown on the e-mail template. How can I create a worflow which sends e-mail to users who has selected security role. Regards, Erdogan Uslu

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• How can I gain root access on a Mac OS X system without wiping the OS?

  - by Richard T

  My father died recently and I've inherited his Mac. I'd love to put it to use in my own life, but I don't want to wipe its brains out just so I can reconfigure it to use in my network, etc. His old files are historically important to me—I trust you can understand my desire to keep them. I can log in as I had an account on the machine before he passed, but that's about it.

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• sending full form data to back end using jquery

  - by pradeep

  i have a form that is dynamically built. so the number of form elements arr not fixed. I wnat to send whole of $_POSt data from the form using jquery to back end for processing .i cant use jquery form plugin as the jquery version i am using is old. any other way ? i tied to do like this $.post('all_include_files/update_save.php',{variable:"<?php echo json_encode($_POST) ?>"},function(data) { alert(data); }) but did not work

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• Error on MulticastSocket.joinGroup()

  - by Pedro Ghilardi

  I'm trying to execute a simple example of Multicast sockets on Java. MulticastSocket s = new MulticastSocket(6789); InetAddress group = InetAddress.getByName("230.1.1.1"); s.joinGroup(group); This code generates the error: IP_ADD_MEMBERSHIP failed (out of hardware filters?) Any idea? Thanks

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• Increase the length of Xcode's "recent project" list?

  - by Bogatyr

  I switch in Xcode between working on a lot of different projects frequently (some I'm actively working on, some are old projects where I'm looking up code I want to re-use or quote in SO answers :)), so that part of my "working set" of projects invariably ends up falling off the recent project list. I do use finder tabs for the full working set of current project folders, but I really like the fast switching available using the recent projects list. Is there a way to increase the length of this list so that I can see more recently opened projects?

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• How can I make an iPhone OS 2.1 project with the new Xcode?

  - by Thanks

  Problem: I want to make iPhone OS 2.1 apps, but Xcode now always makes automatically an iPhone OS 3.0 project. I forgot about it and now I have an app which I want to test on my iPod touch, but I need to build OS 2.1. Is there a way to get this working? The dropdown from top left in Xcode only offers to build for OS 3.0 device. However, when I open old projects, there I have OS 2.1 available.

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• How compliant is SIP VoIP software on the net?

  - by rusbi

  I developed a SIP stack for my company. It's far from perfect, a it's lacking a lot of things from the RFCs, but it's functional and work well with a lot of tested softphones and other SIP hardware and software. My question is: How much of SIP software can truly say that they are entirely SIP compliant? (Of the softphones you can find on the internet...)

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• Using // in a <script>'s source

  - by Dan Beam

  Hello fellow front-end web h4X0|2s, I was wondering if anyone had any resources, proof, or personal experience in using the age-old http/https JavaScript hack: <script src="//someserver.com/js/script.js"></script> Has anyone encountered issues in any of these browsers (IE 5.5+, FF2+, Chrome, Opera 9+, Safari 3+)? Has anybody had success stories? Thank you for your help.

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• cancel typing on form

  - by ntan

  Hi, i have a dialog box with 2 text inputs.Dialog has 2 buttons ok/cancel What i want is when open the dialog and input 1 has a value of "pets" and change it to "animals" when click ok holds the new value (animals) but when click the cancel return to old value (pets). Any help appreciated

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• MYSQL - Query to check against other table (hard to explain...)

  - by Sam

  I have a query that gets a list of emails who have subscribed for a newsletter trial which lasts 30 days.. $thirty = time() - 3024000; SELECT c.email FROM tbl_clients AS c JOIN tbl_clientoptions AS o ON o.client = c.id WHERE o.option = 'newsletter' AND c.datecreated $thirty What I want to do is do a check in that same query so it also returns clients OVER 30 days old if they have the tbl_clientoptions.option = 'trialoverride' (ie; a row in the client options table with the value "trialoverride") basic columns are: TBL_CLIENTS id,name,email,datecreated TBL_CLIENTOPTIONS id,client,option

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• Random Int in VB.Net

  - by brendan

  I need to generate random integer between 1-n (where n is a positive whole number) to use for a unit test. I don't need something overly complicated to ensure true randomnesses - just an old fashioned random number. How would I do that?

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• How to test an iPhone application update?

  - by sfkaos

  I already have an iPhone application (version 1.0) available in the App Store and am ready to submit a newer version (version 1.1). How do I test the new upgrade to make sure that the current sqlite database and property list files on the earlier version do not get deleted/overwritten etc? The new version assumes the old data in both the sqlite database and property lists remain. Or better yet, is there a resource I can use to walk me through what to watch for when developing an application update?

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• dlopen and global variables in C/C++

  - by mjn12

  Due to some restrictions I am being forced to load a library written in C at runtime. A third party provides two library to me as static archives which we turn into shared objects. The application I'm working with loads one of the libraries at runtime based on some hardware parameters. Unfortunately one of the libraries is configured largely with global variables. I am already using dlsym to load function references but can I used dlsym to load references to these global variables as well?

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• Extend base class properties

  - by user1888033

  I need your help to extend my base class, here is the similar structure i have. public class ShowRoomA { public audi AudiModelA { get; set; } public benz benzModelA { get; set; } } public class audi { public string Name { get; set; } public string AC { get; set; } public string PowerStearing { get; set; } } public class benz { public string Name { get; set; } public string AC { get; set; } public string AirBag { get; set; } public string MusicSystem { get; set; } } //My Implementation class like this class Main() { private void UpdateDetails() { ShowRoomA ojbMahi = new ShowRoomA(); GetDetails( ojbMahi ); // this works fine } private void GetDetails(ShowRoomA objShowRoom) { objShowRoom = new objShowRoom(); objShowRoom.audi = new audi(); objShowRoom.audi.Name = "AUDIMODEL94CD698"; objShowRoom.audi.AC = "6 TON"; objShowRoom.audi.PowerStearing = "Electric"; objShowRoom.benz= new benz(); objShowRoom.audi.Name = "BENZMODEL34LCX"; objShowRoom.audi.AC = "8 TON"; objShowRoom.audi.AirBag = "Two (1+1)"; objShowRoom.audi.MusicSystem = "Poineer 3500W"; } } // Till this cool. // Now I got requirement for ShowRoomB with replacement of old audi and benz with new models and new other brand cars also added. // I don't want to modify GetDetails() method. by reusing this method additional logic i want to apply to my new extended model. // Here I struck in designing my new model of ShowRoomB (base of ShowRoomA) ... I have tried some thing like... but not sure. public class audiModelB:audi { public string JetEngine { get; set; } } public class benzModelB:benz { public string JetEngine { get; set; } } public class ShowRoomB { public audiModelB AudiModelB { get; set; } public benzModelB benzModelB { get; set; } } // My new code to Implementation class like this class Main() { private void UpdateDetails() { ShowRoomB ojbNahi = new ShowRoomB(); GetDetails( ojbNahi ); // this is NOT working! I know this object does not contain base class directly, still some what i want fill my new model with old properties. Kindly suggest here } } Can any one please give me solutions how to achieve my extending requirement for base class "ShowroomA" Really appreciated your time and suggestions. Thanks in advance,

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• Webservice for Watching a Table in SQL server and populating it.

  - by GayaMani

  Can we write a web service to watch a table in sql server. whenever the corresponding table is populated with new records, the new records should appended to the another table which has the same structure of the old one. Is this is possible using webservices if not how to perform this.

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