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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 do i change everything behind a certain point in a Jagged array?

  - by Jack Null

  Say I have a jagged array, and position 2,3 is taken by int 3. Every other spot is filled with int 0. How would I fill all the positions behind 2,3 with a 4? 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 to this: 4 4 4 4 4 4 4 4 4 4 4 4 4 3 0 0 0 0 0 0 0 Ive tried variations of this: int a = 2; int b = 3; for (int x = 0; x < a; x++) { for (int y = 0; y < board.space[b].Length; y++) { board.space[x][y] = 4; } }

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• How to strip debug code during compile time in C++?

  - by juvenis

  Say I have a C++ function debugPrint(int foo). How can I most conveniently strip that from release builds? I do not want to surround every call to debugPrint with #ifdefs as it would be really time consuming. On the other hand, I want to be 100% sure that the compiler strips all the calls to that function, and the function itself from release builds. The stripping should happen also, if it's called with a parameter that results from a function call. E.g., debugPrint(getFoo());. In that case I want also the getFoo() call to be stripped. I understand that function inlining could be an option, but inlining is not guaranteed to be supported.

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• C# matching two text files, case sensitive issue

  - by Mike

  What i have is two files, sourcecolumns.txt and destcolumns.txt. What i need to do is compare source to dest and if the text doesnt match write out to a new file. The code below works except i have case sensitive issues like this: CPI Cpi These say they dont match because of captial letters, any help is always thanked! string[] sourcelinestotal = File.ReadAllLines(@"C:\testdirectory\" + "sourcecolumns.txt"); string[] destlinestotal = File.ReadAllLines(@"C:\testdirectory\" + "destcolumns.txt"); foreach (string sline in sourcelinestotal) { if(destlinestotal.Contains(sline)) { } else { File.AppendAllText(@"C:\testdirectory\" + "missingcolumns.txt", sline); } }

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• Persistent Logins

  - by Trido

  I am following this article on creating persistent login cookies with my ASP.NET site: http://msdn.microsoft.com/en-us/library/system.web.security.formsauthentication.encrypt.aspx The issue is that when I navigate to the page, I get the following compiler error: Compiler Error Message: CS1061: 'ASP.administration_login_aspx' does not contain a definition for 'Login_Click' and no extension method 'Login_Click' accepting a first argument of type 'ASP.administration_login_aspx' could be found (are you missing a using directive or an assembly reference?) Can anyone tell me why this is. The error message doesn't really say much and I don't believe I am missing a directive or assembly reference. The code builds without any problems. EDIT: I did not include code because I said I was following that link which includes code. I copy/pasted from the example.

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• Why does my Image stretch when I crop it?

  - by q234e

  I am using the following code snippet in order to crop a image? function crop($width,$height) { $new_image = imagecreatetruecolor($width, $height); imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $this->getWidth(), $this->getHeight(), $width, $height ); $this->image = $new_image; } Here, $this->image is the original image $this->getWidth() and $this->getHeight() holds the original dimensions of the picture, where as $width and $height, is the crop area. But for some reason, the crop image is resized(we can almost say it is resized). How to fix this?

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• How to override virtual function in good style? [C++]

  - by Knowing me knowing you

  Hi, guys I know this question is very basic but I've met in few publications (websites, books) different style of override virtual function. What I mean is: if I have base class: class Base { public: virtual void f() = 0; }; in some publications I saw that to override this some authors would just say: void f(); and some would still repeat the virtual keyword before void. Which form of overwriting is in good style? Thank you for your answers.

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• Debugging metaprograms [C++]

  - by atch

  Hi, Is there any way to check step by step what's going on in let's say template? I mean how it is instantiated step by step and so on? In book I've mentioned here , I found (2 minutes ago) quite interesting example of how binary could be implemented as a metafunction. template <unsigned long N> struct binary { static unsigned const value = binary<N/10>::value << 1 // prepend higher bits | N%10; // to lowest bit }; template <> // specialization struct binary<0> // terminates recursion { static unsigned const value = 0; }; and I think it could be quite useful to be able to see step by step what's been done during the instantiation of this template. Thanks for your replies.

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• If item not in the lst in scheme

  - by ms. sakura

  I'm working on context-free grammars, and I have a function that returns the (terminal values of grammar) for example: i have non-terminal function that results in (A B) , from calling say ((A cat) (B happy np) (A B sad)) so technically A and B are non terminals of the grammar. Now I want to be able to get the terminals (cat happy np sad) (define terminals (lambda (lsts) (cond ((null? lsts) lsts) ((not(member? (car(car lsts)) (n-terminals lsts))) (cons (car(car lsts)) (terminals (car (cdr lsts))))) (else (terminals (cdr lsts)))))) PS: functionality of n-terminals is described above. member? is a boolean function that returns true if an item is a member of the list, false otherwise. My function returns an empty lst. What am I missing here?

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• Rsync module path needs to be a home directory

  - by Malfist

  I'm trying to use rsync to backup windows servers to an rsync server. I'm having problems with rsync on the linux side though, it doesn't like symlinks. Currently I'm trying to use the module path of ~/backup, but rsync says that the chroot failed. I looked up what to do and saw that I needed to add the option use chroot = no and munge symlinks = no. That fixed the @ERROR: chroot failed but now it's telling me @ERROR: chdir failed and the log files say that there is no ~/backup directory. I know the user I'm authenticating with has a backup folder in his directory. How can I fix this? For reference I'm using a .NET port of rsync called NetSync and tunneling it over a port forwarded SSH connection generated with granados.

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• How animate stacking divs in javascript/css?

  - by Teiviere

  Say I have 2 divs with the same CSS class that are stacked on top of each other: div { width:100px; height: 100px; background: red; } How do I make it so that when I click a button at the top of the page, a new div is created from off the screen at the bottom and moves upwards stopping where the 2nd div is.. When the button is clicked again, a 4th div moves in from the bottom of the screen and stops where the 3rd div is... etc creating a "stacked" divs effect? I know about position:fixed and adjusting values for top, but I am not sure how to dynamically calculate where to stop the animation to achieve this effect.

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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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• Shell job control

  - by user1535672

  For my school project I am implementing a shell and I need help with job control. If we type a command, say cat &, then because of the & it should run in background, but it's not working. I have this code: { int pid; int status; pid = fork(); if (pid == 0) { fprintf(stderr, "Child Job pid = %d\n", getpid()); execvp(arg1, arg2); } pid=getpid(); fprintf(stderr, "Child Job pid is = %d\n", getpid()); waitpid(pid, &status, 0); }

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• Get Network type

  - by Moshik

  hello, ive been trying to retrive the current network type, but no success when i say network type: i refer to know this info: if the type is: NETWORK_TYPE_IDEN or NETWORK_TYPE_UMTS.. and so on.. i tried to use: NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo(); or NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo (ConnectivityManager.TYPE_MOBILE); but no success.. i am doing this coz i wanna know if the current network is IDEN, or if the current network is connected through wifi.. any other suggestions will be welcome, thanks!

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• Select distinct ... inner join vs. select ... where id in (...)

  - by Tonio

  I'm trying to create a subset of a table (as a materialized view), defined as those records which have a matching record in another materialized view. For example, let's say I have a Users table with user_id and name columns, and a Log table, with entry_id, user_id, activity, and timestamp columns. First I create a materialized view of the Log table, selecting only those rows with timestamp some_date. Now I want a materliazed view of the Users referenced in my snapshot of the Log table. I can either create it as select * from Users where user_id in (select user_id from Log_mview), or I can do select distinct u.* from Users u inner join Log_mview l on u.user_id = l.user_id (need the distinct to avoid multiple hits from users with multiple log entries). The former seems cleaner and more elegant, but takes much longer. Am I missing something? Is there a better way to do this?

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• Similar Sub-Classes

  - by praks5432

  Lets say I have a class A that is fairly simple like this - public class A{ private int randomField = 0; protected int key; protected double dmg; } Now I want to write a number of sub-classes that inherit the protected fields and only differ based on the initial values that are assigned to those fields - for example, if I wrote two subclasses B and C, the only difference between those two sub-classes would be that the values key and dmg would have different values. They would share a method, set, which would be exactly the same, in that it would affect the same variable. I find when I'm writing these sub-classes I'm repeating myself, as I just change the constructor to set different initial values to key and dmg, and simply copy and paste the set method. Is there a 'good' way to do this?

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• If I write a framework that gets information from the Internet, should I make a degelate or use blocks?

  - by Time Machine

  Say I'm writing a publicly available framework for the Vimeo API. This framework needs to get information from the Internet. Because this can take some time, I need to use threadin to prevent the UI from hanging. Foundation uses delegates for this, like NSURLConnectionDelegate. However, Game Kit uses blocks as callback functions. What is the recommended way of doing this? I know blocks aren't supported in standard GCC versions, but they require less, much less code for the one that uses my framework. Delegates, on the other hand, are real methods and when protocols are used, I'm sure the methods are implemented. Thanks.

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• What is the best practise for relational database tables in mysql?

  - by George

  Hi, I know, there is a lot of info on mysql out there. But I was not really able to find an answer to this specific and actually simple question: Let's say I have two tables: USERS (with many fields, e.g. name, street, email, etc.) and GROUPS (also with many fields) The relation is (I guess?) 1:n, that is ONE user can be a member of MANY groups. What I dis, is create another table, named USERS_GROUPS_REL. This table has only two fields: us_id (unique key of table USERS) and gr_id (unique key of table GROUPS) In PHP I do a query with join. Is this "best practice" or is there a better way? Thankful for any hint!

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• PHP arrays & keys - fetching particular ones

  - by Rohan

  Hi Lets say I have an array with a structure like this: $arr= Array( array( "id"=>"a" "type">"apple"), array( "id"=>"b"), array( "id"=>"c"), array( "id"=>"c" "type"=>"banana") ); now I want to have a foreach loop which fetches all the array elements which have a key in them named "type". Something like foreach(all arrays which have type in them as $item) How would I do that? many thanks.

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• Why Do try ... catch Blocks Require Braces?

  - by Bidou

  Hello. While in other statements like if ... else you can avoid braces if there is only one instruction in a block, you cannot do that with try ... catch blocks: the compiler doesn't buy it. For instance: try do_something_risky(); catch (...) std::cerr << "Blast!" << std::endl; With the code above, g++ simply says it expects a '{' before do_something_risky(). Why this difference of behavior between try ... catch and, say, if ... else ? Thanks!

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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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• SQL query to get lowest 2 values of a counted query selection (using db2)?

  - by jNoob

  Hi, Imagine I already have a query that returns the following: Col1 | Col2 ------------ A | 2 B | 3 C | 3 D | 4 E | 8 ... Say I used something like this: select Col1, count ( * ) as Col2 \ from ... where ... order by Col2 \ group by Col1 \ So now, all I want to select are (Col1, Col2) such that it returns the selections (a, b) and (c, d) where (b >= all (Col2)) and (d >= ((all (Col2)) - a)). So for the above example, it would return {(A, 2), (B, 3), (C, 3)}. How do I go about doing this? Any help would be highly appreciated. Thanks.

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• Do I put ninject in my project that contains my service layer as well?

  - by chobo2

  Hi I have 3 project files(webui,framework that contains service layers and repos and unit tests). Most of my unit testing will be done in the service layer as this will contain all the business logic. So I will be mocking out the repo. In some cases I will query my a repo from my controller(say I just need all users in the database and I am not doing any business logic for it). So I am thinking that I need to have ninject used in my framework project. Where is the best place to put it so I can use them against my repos in my service layers?

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• Shedule tasks question

  - by gabac

  Hi everyone I have a though question :) Let's say you get some data which is due at a certain point int the future. You get A saying my task is due in 1h and other which says his task is due in 1.5h. The information is collected on your server. In which programming language or even how would solve that? So task a will be executed in 1h, task B in 1.5h. I read something about java scheduler but I'm not yet sure if this is the right way. What are ur ideas? Cheers

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• How can I pad part of a string with spaces, in Perl?

  - by sid_com

  Hello! Which version would you prefer? #!/usr/bin/env perl use warnings; use strict; use 5.010; my $p = 7; # 33 my $prompt = ' : '; my $key = 'very important text'; my $value = 'Hello, World!'; my $length = length $key . $prompt; $p -= $length; Option 1: $key = $key . ' ' x $p . $prompt; Option 2: if ( $p > 0 ) { $key = $key . ' ' x $p . $prompt; } else { $key = $key . $prompt; } say "$key$value"

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