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• algorithm to find the three majority elements in an array

  - by Qiang Li

  Let's say there are three elements in a non-sorted array all of which appear more than one-fourth times of the total number of elements. What is the most efficient way to find these elements? Both for non-online and online versions of this question. Thank you! Edit The non-online version I was referring to is: this array is specified in full. The online version means the array elements are coming one at a time. I require the space in addition to time complexity to be tight. disclaimer: THIS IS NOT HOMEWORK! I consider this as research-level question.

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• How Similar are Java, C#, and Python?

  - by Alex

  I know it is a kind of broad question but any answer are appreciated.

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• How do database servers decide which order to return rows without any "order by" statements?

  - by Chris

  Kind of a whimsical question, always something I've wondered about and I figure knowing why it does what it does might deepen my understanding a bit. Let's say I do "SELECT TOP 10 * FROM TableName". In short timeframes, the same 10 rows come back, so it doesn't seem random. They weren't the first or last created. In my massive sample size of...one table, it isn't returning the min or max auto-incrementing primary key value. I also figure the problem gets more complex when taking joins into account. My database of choice is MSSQL, but I figure this might be an interesting question regardless of the platform.

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• Asp.net with MVC multiple model in one view (create, update)

  - by Abdalmohaymen

  I have problem in asp.ne Mvc with multiple model in one view on create and update I 'm work on exams system class Questions and class Answers Question is aparent class and Answers is a child class [Bind(exclude("id"))] class Quesions { public string question{get; set;} public Datetime Timepostquestion{get; set;} } [Bind(exclude("id"))] class Answers { public string answer{get; set;} public Datetime Timepostanswer{get; set;} public questionId {get; set;} } in a view I use two classes how to use classes in insert and update what a way which I have to solve my problem

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• php validate integer [updated]

  - by George Garchagudashvili

  Read B A: I'll give quick example: $a = "\n \t 34 3"; // string(9) $aint = intval($a); // int(34) var_dump($a == $aint); result: bool(true) call me noob but can you tell me why/how does these variables do pass equalization test? What I want to achieve is to check if '1989' equals 1989 would be true, but not any other case. ex: '1989 ' should not pass the test. Also I don't want to use regex. B: I need to validate if variable is integer, I've tried all the available built-in functions or helpful tips, but the only best solution would be regex which I don't want to use this time. also filter_var is not best because it also filters data, but I want to only validate it. 123 -123 '123' '-123' these inputs to be only true, false otherwise I've tried many different options: ctype_digit("-123"); // false - doesn't work is_int('123'); // false filter_var(' 123 ', FILTER_VALIDATE_INT) !== false; // true - doesn't work

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• Pointers and collection of pointers in C++. How to properly delete.

  - by Julen

  Hello, This is a newbe question but I have alwasy doubts with pointers in C++. This is the situation. I have a class A which as a collection (a vector actually) of pointers of class B. This same class A has another collection of pointers to class C. Finally the objects of class B have also a collection to pointers to class C which point to the same instances the class A points to. My question is, if I delete a member of class-C-type pointer in class B, what happens to the pointer in class A that points to the deleted instance of class C? How this situation has to be treated? Thanks a lot in advance! Julen.

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• rewrite condition for directory along with file

  - by RHR

  Any one please help me.I am new to .htaccess I want to check the following condition RewriteCond : IF !index.html AND !app/facebookapp/{[a-zA-Z0-9-/]}.html RewriteRule : ..... My code is RewriteCond %{REQUEST_URI} !index\.html RewriteCond %{REQUEST_URI} app/facebookapp/^([a-zA-Z0-9-/]+).html$ RewriteRule ...... its not working And one more question if the request url is header.html RewriteCond %{REQUEST_URI} header.html$ RewriteRule ^([a-zA-Z0-9-/]+).html$ position.php?position=$1 [L] $l will return header. if the request url is app/facebookapp/header.html we write the same above condition $l will return app/facebookapp/header.my question is how to get only the filename ?? thanks

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• java:25: '.class' expected error while merging arrays

  - by user3677712

  Here is my code, it is asking me to call a class, I am confused as to do this. Noob to java, so any help would be greatly appreciated. line 25 is where the error occurs. This program is merging two arrays together into a new array. public class Merge{ public static void main(String[] args){ int[] a = {1, 1, 4, 5, 7}; int[] b = {2, 4, 6, 8}; int[] mergedArray = merge(a, b); for(int i = 0; i < mergedArray.length; i++){ System.out.print(mergedArray[i] + " "); } } public static int[] merge(int[] a, int[] b){ // WRITE CODE HERE int[] mergedArray = new int[a.length[] + b.length[]]; int i = 0, j = 0, k = 0; while (i < a.length() && j < b.length()) //error occurs at this line { if (a[i] < b[j]) { mergedArray[k] = a[i]; i++; } else { mergedArray[k] = b[j]; j++; } k++; } while (i < a.length()) { mergedArray[k] = a[i]; i++; k++; } while (j < b.length()) { mergedArray[k] = b[j]; j++; k++; } return mergedArray; } } This program is merging two arrays together into a new array.

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• c++: at what point should I start using "new char[N]" vs a static buffer "char[Nmax]"

  - by dan

  My question is with regard to C++ Suppose I write a function to return a list of items to the caller. Each item has 2 logical fields: 1) an int ID, and 2) some data whose size may vary, let's say from 4 bytes up to 16Kbytes. So my question is whether to use a data structure like: struct item { int field1; char field2[MAX_LEN]; OR, rather, to allocate field2 from the heap, and require the caller to destroy when he's done: struct item{ int field1; char *field2; // new char[N] -- destroy[] when done! Since the max size of field #2 is large, is makes sense that this would be allocated from the heap, right? So once I know the size N, I call field2 = new char[N], and populate it. Now, is this horribly inefficient? Is it worse in cases where N is always small, i.e. suppose I have 10000 items that have N=4?

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• Is there any way around the Chrome 5 breakage of Ajax for local files?

  - by nikow

  The recent Chrome 5.0 release completely blocks XMLHTTPRequest requests for local files comming from a local file. Here is just one of the many related bug reports and here is the code change (there is also a SO question caused by this). This breaks a lot of production code, e.g. for documentation systems. Users must be able to browse local documentation without the need to install anything or run executables. My question is if there is any way around this restriction? I'm only interested in solutions that don't require any fancy actions on the users side (nothing beyond a confirmation dialog). Is there any way the HTML5 File API could be used, or maybe postMessage()? Of course this whole issue is very frustrating for many people. Firefox takes a fare more reasonable approach and allows requests inside the directory. So it seems unlikely that other browser vendors will follow Chrome.

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• Why in C++ do we use DWORD rather than unsigned int?

  - by byte

  I'm not afraid to admit that I'm somewhat of a C++ newbie, so this might seem like a silly question but.... I see DWORD used all over the place in code examples. When I look up what a DWORD truly means, its apparently just an unsigned int (0 to 4,294,967,295). So my question then is, why do we have DWORD? What does it give us that the integral type 'unsigned int' does not? Does it have something to do with portability and machine differences?

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• Does /boot safe on top of a lvm LV (logical volume)?

  - by fantoman

  Title already asked the question. More specifically, I read in some documents that logical volumes are nice in general but not for /boot in a linux system. They say that bootloaders don't understand LVM volumes, so create a separate partition for /boot out of lvm. I recently installed Ubuntu server (9.10) for my home server, but by default /boot is created in the LVM. Everything is fine now, but I am not sure it is safe to use /boot in LVM. Second question is do I really need a physical partition (volume)(pv) for /boot or is it equally fine if I put it into a logical volume (lv) on top of a single shared volume group. Thanks in advance.

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• Redis suggesstion for selecting data type

  - by PHP Connect

  We have questions based where in home page we were showing 2 list Questions by date modified Question have bigger views and ans count. And in this both listing if question have same views or ans count then sorting is based on date. Previously i am directly quiring to MySQL database and fetching the values so it's easy. But each page request hitting to MySQL it's bit expensive then start doing caching. I started using Redis. Following is the cases when i use redis cache Issues is On second listing i have to display questions by votes and not answered combine. How can i stored this type of data in redis to load faster with sorting based by 2 conditions votes with time and ans count with time?

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• Trouble with ID in NSString

  - by useboot

  I am trying to create something interesting in my application. So, I created an UILabel and I want to output new value. So, my code. NSString *test = @"13"; self.UserAge.text = @"Your age is %@", test; But it doesn't work. In Console-Command Mode I can do it with NSLog(); My result is "Your age is %@". But I need to output "Your age is 13". What do I should do with name? Sorry, if my question is easy for you. I am beginner. :) Thank you everyone who will answer on my question.

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• PHP / XHTML. Should I place everything in echo tags?

  - by 110175914651386975417

  A quick question involving PHP development, I seem to be wondering about this more and more as I develop more complex sites. Basically say we have a basic PHP / XHTML inbox (messaging system). I perform checks at the top (check if user is logged in, check if user has correct permissions etc). Then use the 'header('location:www.abc.com)' function if the authentication fails. The question is do I write the rest of the inbox code in a huge 'else' block or just use standard html. I read somewhere about about it being bad to put any code after using the 'header' function.

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• iPhone:Can binaries developed in Xcode 3.1.3 be deployable on iPhone 3.1.3 device?

  - by user187532

  Hi, Sorry to ask you such a basic question. I am facing some problem here, so that is why asking this question. I have Xcode 3.1.3 and developed an application. I am trying to install this binary with proper provisional profile onto iPhone 3G 3.1.3 device on another windows computer. But i'm unable to install on the device through iTunes. Can binaries developed using Xcode 3.1.3 be able to install on iPhone 3.1.3 version devices right? Please advise. Thanks.

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• C / C++ / C#: Howto do "mount -a"

  - by Quandary

  Question: In C/C++/C#. (I need it for C#, but C and C++ is also fine). How can I do a mount -a on Linux. I mean programmatically, without starting a process like system("mount -a"); Edit: Note the "-a". My question is not actually about how to mount A mountpoint. It's about how to mount ALL mountpoints in /etc/fstab. That means parsing the file, extracting the mountpoints, check if already mounted, and only if not already mounted, mount...

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• sort list(of string()) using a variable index into string() as key - vb.net

  - by tullynyguy

  I have a List(of String()). I have written a custom comparer (implements IComparer(of string)) to do an alphanumeric sort. Is there a way to sort the List using a given index to determine which position in the String() to sort by? In other words one time I might sort by Index = 0 and another time by Index = 3. The length of all String() in the list is the same. For reference this question is similar to Sort List<String[]> except I am using VB.net and that question is hardwired to Index=0.

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• Is there any c++ class that can't be used in STL?

  - by skydoor

  Just come up with this question. Any hint?

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• private virtual function in derived class

  - by user1706047

  class base { public: virtual void doSomething() = 0; }; class derived : public base { **private:** virtual void doSomething(){cout<<"Derived fn"<<endl;} }; now if i do the following: base *b=new child; b->doSomething(); //it calls the derived class fn even if that is private. Question: 1.its able to call the derived class fn even if that is private.How is it possible? Now if i change the inheritance access specifier from public to protected/private then i get compilation error as "'type cast' : conversion from 'Derived *' to 'base *' exists, but is inaccessible" Notes: I am aware on the concepts of the inheritance access specifiers.So in second case as its derived private/protected, its inaccessible. But here it confuses me for the first question. Any input will be highly appreciated

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• Javascript Image object without instantiating

  - by user276027

  This question is about javascript performance. Consider 3 examples for illustration: function loadImgA() { new Image().src="http://example.com/image.gif" } function loadImgA1() { Image().src="http://example.com/image.gif" } function loadImgB() { var testImg = new Image(); testImg.src="http://example.com/image.gif" } Now the point is I don't really need to manipulate the the image object after it was created, hence loadImgA(). The question is, what happens if nothing is assigned to the return value of the new Image() constructor - in that case I can actually skip the 'new' keyword as in loadImgA1()? Does the object then live outside the function or somehow affects memory usage? Other implications, differences? I reckon not, as no real instance was actually created? To put this into perspective, I only need to get the http request for image through. No preloading or other advanced image manipulation. What would be the preferred method from the above?

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• What is the right way to modify a wordpress query in a plugin?

  - by starepod

  Basically i am playing with a plugin that allows future-dated posts on archive pages. My question is broader than this specific functionality, but everyone likes some context. I have my head around many of the plugin development concepts, but must be missing something very basic. I can successfully rewrite a query that gives me the results i want like this: function modify_where( $where ) { global $wp_query; // define $year, $cat, etc if( is_archive() ) { $where = " AND YEAR(wp_posts.post_date)='".$year."' AND wp_term_taxonomy.taxonomy = 'category' AND wp_term_taxonomy.term_id IN ('".$cat."') AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'future')"; } return $where; } add_filter('posts_where', 'catCal_where' ); However, if i attempt to create a new WP_Query('different_query_stuff') after the main loop the new query uses the same WHERE statement outlined above. The question is : What am I missing? Thanks.

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• AS3 - Can I have access to the object (or function) who call me?

  - by lk

  I've asked this same question with Python. Now I like to know if this can be done in AS3. If I have something like this: package { public class SomeClass { private function A():void { C() } private function B():void { C() } private function C():void { // who is the caller, A or B ??? } public function SomeClass() { A() B() } } } Despite the design or other issues, this is only a question of an inquiring mind. Note: This has to be done without changing C signature Note 2: I like to have an access to an instance of the caller function so I can call that caller function (if I want to)

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• Control.Invoke() vs. Control.BeginInvoke()

  - by user590088

  First of all, I would like to apologize for my bad grammar since English is not my native tongue. This is my understanding: Control.Invoke(delegated_method) // Executes on the thread wich the control was created on witch holds its handle ,typically this would be the main thread of a winform application . Control.BeginInvoke(delegated_method // Executes asynchronously on a threadPool Thread . According to MSDN, it says Executes a delegate asynchronously on the thread that the control's underlying handle was created on. My QUESTION : Am I to understand that beginInvoke treats the main thread in this matter as it would the thread pool, and execute the delegated method on the main thread when it "gets a chance" ? Another question which is raised, is it possible to create a control not on the main thread ? if so could someone give me an example?

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• how to use javascript to download a file on Chrome without Chrome auto renaming file to "download"? [duplicate]

  - by user3688566

  This question already has an answer here: Is there any way to specify a suggested filename when using data: URI? 11 answers I use javascript to generate a file and download. It seems that depending on the version of chrome, the download file names can be auto renamed to 'download'. is there a way to avoid it? this is my code: var link = document.createElement("a"); link.setAttribute("href", 'data:application/octet-stream,' + 'file content here'); link.setAttribute("download", 'file1.txt'); link.click(); This is not a duplicated question because i am using the latest chrome and the previously suggested hyperlink is exactly what i am using. I think chrome v34 works fine. but once my chrome autoupdated to v35, it went back to 'download' file name.

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