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  • Interview question ranking FizzBuzz (1), implementing malloc (10)

    - by blrs
    I'd like to have your opinion on the difficulty of the following interview question: Find the subarray with maximum sum in an array of integers in O(n) time. This trivial sounding problem was made famous by Jon Bentley in his Programming Pearls where he uses it to demonstrate algorithm design techniques. On a scale of 1-10, 1 being the FizzBuzz (or HoppityHop) test and 10 being implement the C stdlib function malloc(), how would you rank the above problem? I think the people who can best answer this question are those who have read Programming Pearls and have tried to solve this problem on their own. To motivate those who haven't, 'Programming Pearls' gets featured many times in the 'Top 10 programming books' list.

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  • Why does everyone dislike PHP? [closed]

    - by SomeKittens
    I'm primarily a Java/Python programmer, but I just picked up an entry-level job doing web development. I had to learn PHP, and several of my CS friends told me that it would stunt my coding ability/be terrible to program in/murder me in the middle of the night. So far, there have been annoying moments with the language (one particular thing that bugs me is the syntax for calling functions...), but nothing living up to the statements of my friends. I still haven't learned very much about the language. Is their hate justified? Why or why not? A few quotes I've seen about PHP: Haskell is faster than C++, more concise than Perl, more regular than Python, more flexible than Ruby, more typeful than C#, more robust than Java, and has absolutely nothing in common with PHP. Audrey Tang "PHP is a minor evil perpetrated and created by incompetent amateurs, whereas Perl is a great and insidious evil, perpetrated by skilled but perverted professionals." Jon Ribbens. Programmer.

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  • Un chercheur informe Google d'une faille dans l'Android Market et le regrette, il aurait pu gagner le concours de hacking Pwn2Own

    Un chercheur informe Google d'une faille dans l'Android Market Et le regrette, il aurait pu gagner le concours de hacking Pwn2Own Un chercheur en sécurité a signalé à Google une vulnérabilité pouvant toucher son OS mobile Android. Une faille qu'il aurait pu utiliser lors du concours de hacking Pwn2Own qui se déroule actuellement et auquel il participe. Jon Oberheide, a découvert une vulnérabilité critique touchant l'Android Market ui pouvait être exploitée par un pirate pour installer à distance des applications malveillantes sur les terminaux Android en incitant les utilisateurs à cliquer sur un lien malveillant. Pensant que l'utilisation de cette vulnérabilité lors de la compéti...

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  • Dynamic Fields/Columns

    - by DanMark
    What is the best way to allow for dynamic fields/database columns? For example, let's say we have a payroll system that allows a user to create unique salary structures for each employee. How could/should one handle this scenario? I thought of using a "salary" table that hold the salary component fields and joining these columns to a "salary_values" table that hold the actual values. Does this make sense? Example Salary Structures: Notice how the components of the salary can be shared or unique. -- Jon's Salary -- Basic 100 Annual Bonus 25 Tel. Allowances 15 -- Jane's Salary -- Basic 100 Travel Allowances 10 Bi-annual Bonus 30

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  • Restricted Flow Of Power

    - by user13827
    I'm sure all is fine, but i need some reassurance. Last month my company launched consolidated two of their websites into one new website. www.fdmgroup.com and www.fdmacademy.com into a newly designed www.fdmgroup.com. Because the FDM Academy grew as it's own brand we decided not to just forward the domain to the fdmgroup website, but instead just mirror the new FDM Group website and use a canonical tags to the FDM Group domain (so the link juice will pass to the FDM Group domain pages) The website has be live for nearly a month and i don't believe any power has passed down through the FDM Group website to it's deeper pages even though 301 redirects from the legacy group and academy domains in place. I am also seeing the same problem on the FDM Academy domain, but i expect to see this as every page has a canonical to the same page on the Is there anything which is restricting the flow of power through the site, or am i just being impatient. Thanks in advance Jon

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  • As a minor, how can I make programming profitable? [closed]

    - by lesderid
    Possible Duplicate: Can I be “too young” to get a programming job? I’m 15 and I want to Freelance I've always loved programming. I started when I was about 8 with making some silly WinForms applications in VB.Net that basically did nothing. Now, I'm 15 and I would say I'm quite good C# and I'm reading through Jon Skeet's C# In Depth. I also have some experience with VB, C++ and Assembler (mostly reverse engineering). I really love coding, which got me wondering about college, what I can study to get into the software business. However, I would like to earn some money now, so I can spend it on better hardware, on development tools or on other hobbies. This is hard because I don't have any work experience nor have I done any programming-related studies. It's also not legal for me to do any freelancing jobs as I'm under the age of 18. How can I use my current experience at my age to earn some money?

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  • how to use SQL wildcard % with Queryset extra>select?

    - by tylias
    I'm trying to add weights to search terms I'm using to filter a queryset. Using the '%' wildcard is causing me some problems. I'm using the extra() modifier to add a weight parameter to the queryset, which I will be using to inform a sort ordering. (See http://docs.djangoproject.com/en/1.1/ref/models/querysets/#extra-select-none-where-none-params-none-tables-none-order-by-none-select-params-none ) Here's the gist of the code: def viewname(request) ... exact_matchstrings="" exact_matchstrings.append("(accountprofile.first_name LIKE '" + term + "')") exact_matchstrings.append("(accountprofile.first_name LIKE '" + term + '\%' + "')") extraquerystring = " + ".join(exact_matchstrings) return_queryset = return_queryset.extra( select = { 'match_weight': extraquerystring }, ) The effect I'm going for is that if the search term matches exactly, the weight associated with the record is 2, but if the term merely starts with the search term and isn't an exact match, the weight is 1. (for example, if 'term' = 'Jon', an entry with first_name='Jon' gets a weight of 2 but an entry with an entry with first_name = 'Jonathan' gets a weight of 1.) I can test the statement in SQL and it seems to work well enough. If I make this SQL query from the mysql shell, no problem: select (first_name like "Carl") + (first_name like "Car%") from accountprofile; But trying to run it via the extra() modifier in my view code and evaluating the resulting queryset gives me the following error: Traceback (most recent call last): File "<console>", line 1, in <module> File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 68, in __repr__ data = list(self[:REPR_OUTPUT_SIZE + 1]) File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 83, in __len__ self._result_cache.extend(list(self._iter)) File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 238, in iterator for row in self.query.results_iter(): File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 287, in results_iter for rows in self.execute_sql(MULTI): File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/query.py", line 2369, in execute_sql cursor.execute(sql, params) File "/usr/local/lib/python2.6/dist-packages/django/db/backends/util.py", line 22, in execute sql = self.db.ops.last_executed_query(self.cursor, sql, params) File "/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 217, in last_executed_query return smart_unicode(sql) % u_params ValueError: unsupported format character ''' (0x27) at index 309 I've tried it escaping and not escaping % wildcard but that doesn't solve the problem. Doesn't seem to affect it at all, really. Any ideas?

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  • What Sorting Algorithm Is Used By LINQ "OrderBy"?

    - by Mystagogue
    Evidently LINQ's "OrderBy" had originally been specified as unstable, but by the time of Orca it was specified as stable. Not all documentation has been updated accordingly - consider these links: Jon Skeet on OrderBy stability Troy Magennis on OrderBy stability But if LINQ's OrderBy is now "stable," then it means it is not using a quicksort (which is inherently unstable) even though some documentation (e.g. Troy's book) says it is. So my question is: if not quicksort, then what is the actual algorithm LINQ's orderBy is using?

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  • ASP.NET MVC: Implementing an OpenID sign-in page ala NerdDinner v2

    - by pcampbell
    Consider the log in page on NerdDinner.com: http://www.nerddinner.com/Account/LogOn Some nice features: jQuery effects on the OpenID choice popups for the other major providers Is this revision of the NerdDinner AccountController and its View available for public download? How would you reinvent this implementation? Any code you can post would be fine. Calling Jon Galloway!

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  • "Push" linq vs reactive framework

    - by Benjol
    (Once again exposing the depths of my ignorance here by combining two concepts which I haven't grokked) I read here about the Reactive framework being a 'Push' model compared to Linq's 'Pull' model. This reminded me of reading an article about 'Push' Linq. Is there really any similarity between these two 'frameworks'? UPDATE Since I asked this question, Jon Skeet has asked it too, here are his first and second impressions.

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  • Best jQuery rounded corners script?

    - by jonhobbs
    Hi, I've been looking at varios scripts for adding automatic rounded corners to a div using jQuery but there are loads of plugins available, none of which seem perfect. So, does anybody know of a script that is quick to render, supports IE6, anti-aliases and supports opacity? Any help would really be appreciated, Jon.

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  • gwt ext combobox

    - by usman
    hi, i am using gwt ext.i have a combo box.i want to set my own filter to display the value. Any idea please eg: combobox contain : jon , jockey jo, rock k, michle ken, jonty mark, if i enter k the combo box has to show rock k. condition is it has to check the starting letter word of the list

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  • Algorithm to compare people names to detect identicalness

    - by Pentium10
    I am working on address book synchronization algorithm. I would like to reuse some code if there exists, but couldn't find one yet. Does someone know about an algorithm that will tell me in numbers/float/procent how much two names are identical. Levenstein distance is not good in this approach, as names and our adddress books are matching the begining of each of the name sections. John Smith should match Smith Jon, Jonathan Smith, Johnny Smith

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  • What are guard methods/classes?

    - by Paul Sasik
    i just noticed the guard method/class mentioned in this question and i don't really get the concept from the answers. And alas, Jon Skeet's link to an MS site never loaded. A few quick Google searches seemed to yield only products, not software engineering concepts. Any explanation and/or samples would be appreciated. (Especially from the .Net side of things.)

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  • Tutorials on packaging a java application

    - by JCH
    Hi, Can somebody point me to some tutorials and best practices that show to make a build from source code for a java desktop / jee web application ? I want to learn what needs to be packaged as a war/jar from source and how it must be structured? br /jon

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  • Help me understand this "Programming pearls" bitsort program

    - by ardsrk
    Jon Bentley in Column 1 of his book programming pearls introduces a technique for sorting a sequence of non-zero positive integers using bit vectors. I have taken the program bitsort.c from here and pasted it below: /* Copyright (C) 1999 Lucent Technologies */ /* From 'Programming Pearls' by Jon Bentley */ /* bitsort.c -- bitmap sort from Column 1 * Sort distinct integers in the range [0..N-1] */ #include <stdio.h> #define BITSPERWORD 32 #define SHIFT 5 #define MASK 0x1F #define N 10000000 int a[1 + N/BITSPERWORD]; void set(int i) { int sh = i>>SHIFT; a[i>>SHIFT] |= (1<<(i & MASK)); } void clr(int i) { a[i>>SHIFT] &= ~(1<<(i & MASK)); } int test(int i){ return a[i>>SHIFT] & (1<<(i & MASK)); } int main() { int i; for (i = 0; i < N; i++) clr(i); /*Replace above 2 lines with below 3 for word-parallel init int top = 1 + N/BITSPERWORD; for (i = 0; i < top; i++) a[i] = 0; */ while (scanf("%d", &i) != EOF) set(i); for (i = 0; i < N; i++) if (test(i)) printf("%d\n", i); return 0; } I understand what the functions clr, set and test are doing and explain them below: ( please correct me if I am wrong here ). clr clears the ith bit set sets the ith bit test returns the value at the ith bit Now, I don't understand how the functions do what they do. I am unable to figure out all the bit manipulation happening in those three functions. Please help.

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  • 8bpp Bitmap format on the Compact Framework

    - by Kieran
    Hi friends. I am messing around with Conway's Game of Life - http://en.wikipedia.org/wiki/Conway's_Game_of_Life I started out coding algorithmns for winforms and now want to port my work onto windows mobile 6.1 (compact framework). I came across an article by Jon Skeet where he compared several different algorithmns for calculating next generations in the game. He used an array of bytes to store a cells state (alive or dead) and then he would copy this array to an 8bpp bitmap. For each new generation, he works out the state of each byte, then copies the array to a bitmap, then draws that bitmap to a picturebox. void CreateInitialImage() { bitmap = new Bitmap(Width, Height, PixelFormat.Format8bppIndexed); ColorPalette palette = bitmap.Palette; palette.Entries[0] = Color.Black; palette.Entries[1] = Color.White; bitmap.Palette = palette; } public Image Render() { Rectangle rect = new Rectangle(0, 0, Width, Height); BitmapData bmpData = bitmap.LockBits(rect, ImageLockMode.ReadWrite, bitmap.PixelFormat); Marshal.Copy(Data, 0, bmpData.Scan0, Data.Length); bitmap.UnlockBits(bmpData); return bitmap; } His code above is beautifully simple and very fast to render. Jon is using Windows Forms but now I want to port my own version of this onto Windows Mobile 6.1 (Compact Framework) but . . . .there is no way to format a bitmap to 8bpp in the cf. Can anyone suggest a way of rendering an array of bytes to a drawable image in the CF. This array is created in code on the fly (it is NOT loaded from an image file on disk). I basically need to store an array of cells represented by bytes, they are either alive or dead and I then need to draw that array as an image. The game is particularly slow on the CF so I need to implement clever optimised algoritmns but also need to render as fast as possible and the above solution would be pretty dam perfect if only it was available on the compact framework. Many thanks for any help Any suggestions?

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  • How to do the processing and keep GUI refreshed using databinding?

    - by macias
    History of the problem This is continuation of my previous question How to start a thread to keep GUI refreshed? but since Jon shed new light on the problem, I would have to completely rewrite original question, which would make that topic unreadable. So, new, very specific question. The problem Two pieces: CPU hungry heavy-weight processing as a library (back-end) WPF GUI with databinding which serves as monitor for the processing (front-end) Current situation -- library sends so many notifications about data changes that despite it works within its own thread it completely jams WPF data binding mechanism, and in result not only monitoring the data does not work (it is not refreshed) but entire GUI is frozen while processing the data. The aim -- well-designed, polished way to keep GUI up to date -- I am not saying it should display the data immediately (it can skip some changes even), but it cannot freeze while doing computation. Example This is simplified example, but it shows the problem. XAML part: <StackPanel Orientation="Vertical"> <Button Click="Button_Click">Start</Button> <TextBlock Text="{Binding Path=Counter}"/> </StackPanel> C# part (please NOTE this is one piece code, but there are two sections of it): public partial class MainWindow : Window,INotifyPropertyChanged { // GUI part public MainWindow() { InitializeComponent(); DataContext = this; } private void Button_Click(object sender, RoutedEventArgs e) { var thread = new Thread(doProcessing); thread.IsBackground = true; thread.Start(); } // this is non-GUI part -- do not mess with GUI here public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string property_name) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(property_name)); } long counter; public long Counter { get { return counter; } set { if (counter != value) { counter = value; OnPropertyChanged("Counter"); } } } void doProcessing() { var tmp = 10000.0; for (Counter = 0; Counter < 10000000; ++Counter) { if (Counter % 2 == 0) tmp = Math.Sqrt(tmp); else tmp = Math.Pow(tmp, 2.0); } } } Known workarounds (Please do not repost them as answers) Those two first are based on Jon ideas: pass GUI dispatcher to library and use it for sending notifications -- why it is ugly? because it could be no GUI at all give up with data binding COMPLETELY (one widget with databinding is enough for jamming), and instead check from time to time data and update the GUI manually -- well, I didn't learn WPF just to give up with it now ;-) and this is mine, it is ugly, but simplicity of it kills -- before sending notification freeze a thread -- Thread.Sleep(1) -- to let the potential receiver "breathe" -- it works, it is minimalistic, it is ugly though, and it ALWAYS slows down computation even if no GUI is there So... I am all ears for real solutions, not some tricks.

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  • How do I make a table from a List MVC?

    - by user54197
    I have a List(Name, Item, Group#) that I would like to display in a table. How do I display this data with all the names in the 1st row, item in the 2nd, and group number in the 3rd row. Name: | Jon | Tom | Kate | Brian | Item: | Cup | Hat | Door | Store | Group#:| 2 | 8 | 10 | 154 |

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  • Android - getting data from a server

    - by jonhobbs
    I've read lots about using local storage for android but how would I connect to an SQL database online to send and get data? For example, if I was making a game and wanted to create a worldwide high score table, how would I store that online and make sure it was only available to that app? Thanks, Jon

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