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• Diophantine Equation

  - by swapnika

  Write an iterative program that finds the largest number of McNuggets that cannot be bought in exact quantity. Your program should print the answer in the following format (where the correct number is provided in place of n): "Largest number of McNuggets that cannot be bought in exact quantity: n" Hints: Hypothesize possible instances of numbers of McNuggets that cannot be purchased exactly, starting with 1 For each possible instance, called n, 1. Test if there exists non-negative integers a, b, and c, such that 6a+9b+20c = n. (This can be done by looking at all feasible combinations of a, b, and c) 2. If not, n cannot be bought in exact quantity, save n When you have found six consecutive values of n that in fact pass the test of having an exact solution, the last answer that was saved (not the last value of n that had a solution) is the correct answer, since you know by the theorem that any amount larger can also be bought in exact quantity

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• How do I sort a hash table in javascript?

  - by Colen

  I have a javascript hash table, like so: var things = [ ]; things["hello"] = {"name" : "zzz I fell asleep", "number" : 7}; things["one"] = {"name" : "something", "number" : 18}; things["two"] = {"name" : "another thing", "number" : -2}; I want to sort these into order by name, so if I iterate through the hash table it will go in order another thing something zzz I fell asleep I tried doing this: function compareThings(thing1, thing2) { var name1 = thing1["name"].toLowerCase(); var name2 = thing2["name"].toLowerCase(); if (name1 < name2) { return -1; } if (name1 > name2) { return 1; } return 0; } things.sort(compareThings); But it doesn't seem to work. Edit: it occurs to me that perhaps a sorted hash table is an oxymoron. If so, what's the best way to get access to a sorted list of the things here?

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• Change Call Screen

  - by vyana

  I need to change or customize the call screen when initiating a call on Android. After searching on google I do not find any way to do it. There is no way to send DTMF tones during a call, the idea is to send a specific number to the call screen. So when a call is made is possible to see the number to dial during a call to the PBX. I tried to putting the number in the "status bar", but the notification hide after seconds and it is not practical. I appreciate any other suggestion. Thanks

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• R heatmaps - non-text labels?

  - by Carl

  I am making a heatmap plot; currently the axes are labeled by index number. However, the index number corresponds to a series of 1/0s, which my group typically represents with a row of filled(1) or unfilled(0) boxes (think chessboard, though not strictly alternating colors). I'd like to use that representation instead of the index numbers. Any suggestions? I've considered simply making the labels as a plot, and positioning that adjacent to the heatmap, but I'm not finding a convenient way to do that either. I will also appreciate answers that are more generically applicable. edit - current code: map <- data.matrix(read.csv("./heatmap.out", header=F, sep=" ")) # ...some clean-up p<-heatmap(map, Rowv=NA, Colv=NA, col=grey(10:0 / 10)) this simply labels the heatmap rows/cols by index number. heatmap.out is raw numeric data.

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• jquery select iframe children

  - by Val

  I am using the editArea library and jquery to do what i need... http://www.cdolivet.com/index.php?page=editArea&sess=2b8243f679e0d472397bfa959e1d3841 so in my html there is an iframe tag that editArea uses what i need is to access something like so with jquery $('iframe textarea').keydown(function (e){ number = 17; //any number really :) if(e.which == number){ //do something... alert('Done...'); } }); I tried the above but it looks like it is not detecting that key. but it works if selector was $(document) therefore the rest of the function works it's just it's not picking up the iframes textarea keydown any ideas? Thanks

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• GMP variable's bit size..

  - by kishorebjv

  How to know the size of a declared variable in GMP??or how can we decide the size of an integer in GMP? mpz_random(temp,1); in manual it is given that this function allocates 1limb(=32bits for my comp) size to the "temp".... but it is having 9 digit number only.. SO i dont think that 32 bit size number holds only 9 digits number.. So please help me to know the size of integer variable in GMP .. thanks in adv..

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• Help needed inorder to avoid recursion

  - by Srivatsa

  Hello All I have a method, which gives me the required number of Boxes based on number of devices it can hold.Currently i have implemented this logic using recursion private uint PerformRecursiveDivision(uint m_oTotalDevices,uint m_oDevicesPerBox, ref uint BoxesRequired) { if (m_oTotalDevices< m_oDevicesPerBox) { BoxesRequired = 1; } else if ((m_oTotalDevices- m_oDevicesPerBox>= 0) && (m_oTotalDevices- m_oDevicesPerBox) < m_oDevicesPerBox) { //Terminating condition BoxesRequired++; return BoxesRequired; } else { //Call recursive function BoxesRequired++; return PerformRecursiveDivision((m_oTotalDevices- m_oDevicesPerBox), m_oDevicesPerBox, ref BoxesRequired); } return BoxesRequired; } Is there any better method to implement the same logic without using recursion. Cos this method is making my application very slow for cases when number of devices exceeds 50000. Thanks in advance for your support Constant learner

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• 500px.com Ranking Algorithm

  - by alex

  I was recently wondering how http://500px.com calculates their "Pulse" rating. The "Pulse" is a score from 1..100 based on the popularity of the photo. I think it might use some of the following criteria: Number of likes Number of "favorites" Number of comments Total views maybe the time since the photo has been uploaded maybe some other non-obvious criteria like the users follower count, user rank, camera model or similar How would I achieve some sort of algorithm like this? Any advice on how to implement an algorithm with this criteria (and maybe some code) would be appreciated too.

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• Why does does my stack overflow error occur after 518669 specifically?

  - by David

  I created a java program to count up toward infinity: class up { public static void up (int n) { System.out.println (n) ; up (n+1) ; } public static void main (String[] arg) { up (1) ; } } i didn't actually expect it to get there but the thing that i noticed that was a bit curious was that it stopped at the same number each time: 518669 what is the significance of this number? (or of this number +1 i suppose). (also as a bit of an aside question, I've been told that the way i format my code is bad [indentation and such] what am i doing that isn't desirable?)

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• PHP PDO bindValue() weird problem

  - by TheMagician

  <?php try { $db = new PDO("mysql:host=localhost;dbname=DBNAME", "USER", "PASSWD"); $stmt = $db->prepare("SELECT id, name FROM testdb ORDER BY time DESC LIMIT :index, 10"); $stmt->bindValue(":index", $_GET['index'], PDO::PARAM_INT); $stmt->execute(); while( $r = $stmt->fetch(PDO::FETCH_ASSOC) ) { echo var_dump($r); } } catch( PDOException $e ) { die("Exception"); } The problem is on this line: $stmt-bindValue(":index", $_GET['index'], PDO::PARAM_INT); And the specific parameter is the second one. The code as it is above doesn't work, it doesn't return anything so the while loop isn't executed. If I replace $_GET['index'] with a number, like 10, it works just fine, it returns 10 rows. Echoing $_GET['index'] displays a number, so it should pass a number. I've also tried bindParam, but the result is same. Why isn't this working?

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• autoLink for map not working

  - by OceanBlue

  I have the following TextView in my XML layout file:- <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/autolink_test" android:autoLink="all" /> The string autolink_test contains a phone number, an email address, a website address and a physical geographical address. While the first three are showing up correctly as clickable autolinks, the address does not. Only the zipcode part shows up as an autolink... and that too as a phone number! (When I click it, the phone dialer starts up with that number). Any help would be appreciated.

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• How to store a numeric value which can have other statuses in a database?

  - by Jiho Han

  I need to store a set of numbers in a database which are imported from a spreadsheet. Sometimes a number is just a number. But in other times, a value can be "missing", "N/A", or blank and these all represent different things. What would be a good approach to store these numbers in the database? Originally I only had to account for N/A. So I made it -1 as I imported them (this only works if the number can never be negative obviously). I could use other negative numbers for other statuses. However, that seems clunky to me. Should I store the numbers as string then apply conversion at use time? Should I create a matching table that stores different statuses of each value?

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• Accessing and binding events to an ASP.NET Grid view using Jquery

  - by Sayem Ahmed

  I have an ASP page which displays a text box when it loads. It takes an input number, send it to the server through post back, and then displays some record in a grid view. After a number is input into the box, the server fetches some data from a database and add records to the grid view. It also contains a link column, whose URL is set to "#", so that the page isn't redirected when it is clicked. Now I want to bind a jquery "click" event to that link. How can I do that ? I have tried that to do myself but failed, because it is not available when the DOM is loaded (since it only contains rows when a number is input through the box), and is being modified through ASP.NET Ajax post back.

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• String Field Sizes for unicode database fields using different data access components

  - by Serg

  mjustin in his question 1 and question 2 says that TWideStringField.Size property for UTF8 fields in Delphi 2009 dbExpress is 4 times larger than the logical field size (max number of characters in the field). I inclined to consider this a dbExpress bug. That is what Delphi 2009 Help says: The interpretation of Size depends on the data type. The meaning of Size for data types that use it is given in the following table. For all other data types, Size is not used and its value is always 0. ftString - Size is the maximum number of characters in the string. I am using FibPlus 6.9.9 and it follows the above documentation - the string field size is the maximum number of characters, not bytes. So the question also implies the following question: Are DbExpress drivers in Delphi 2009 unusable for unicode databases?

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• Is using value converters to generate GUI-friendly strings a misuse of value converters?

  - by tempy

  Currently, I use value converters to generate user-friendly strings for the GUI. As an example, I have a window that displays the number of available entities in the status bar. The Viewmodel simply has an int dependency property that the calling code can set, and then on the binding for the textbox that displays the number of entities, I specify the int dependency property and a value converter that changes "x" into "x entities available". My code is starting to become littered with these converters, and I have a large number of annoying resource declarations in my XAML, and yet I like them because all the GUI-specific string formatting is being isolated in the converters and the calling code doesn't have to worry about it. But still, I wonder if this is not the purpose that value converters were made for.

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• I am getting exception in main thread...even when i am handling the exception

  - by fari

  public KalaGame(KeyBoardPlayer player1,KeyBoardPlayer player2) { //super(0); int key=0; try { do{ System.out.println("Enter the number of stones to play with: "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); key = Integer.parseInt(br.readLine()); if(key<0 || key>10) throw new InvalidStartingStonesException(key); } while(key<0 || key>10); player1=new KeyBoardPlayer(); player2 = new KeyBoardPlayer(); this.player1=player1; this.player2=player2; state=new KalaGameState(key); } catch(IOException e) { System.out.println(e); } } when i enter an invalid number of stones i get this error Exception in thread "main" InvalidStartingStonesException: The number of starting stones must be greater than 0 and less than or equal to 10 (attempted 22) why isn't the exception handled by the throw i defined at KalaGame.<init>(KalaGame.java:27) at PlayKala.main(PlayKala.java:10)

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• An interview question.

  - by SysAdmin

  I recently came across a question somewhere Suppose you have an array of 1001 integers. The integers are in random order, but you know each of the integers is between 1 and 1000 (inclusive). In addition, each number appears only once in the array, except for one number, which occurs twice. Assume that you can access each element of the array only once. Describe an algorithm to find the repeated number. If you used auxiliary storage in your algorithm, can you find an algorithm that does not require it? what i am interested to know is the second part. i.e without using auxiliary storage . do you have any idea?

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• accepts_nested_attributes_for and has_many :through relations.

  - by antiarchitect

  I want to make a simple examing application on RoR 2.3. The problem area is to make an exam_session in a one form with only one submit action. For the exam session there are selected some number of questions from the question pool in random order. For these questions there are selected some number of alternatives (to check is this a single answer question or multi answer question I use the number of correct alternatives: if only 1 - single, 1 - multi. Radiobuttons or checkboxes in form to answer depends on it). I have models: Questions ---< Alternative and ExamSession. I think there must be has_many :through relations between ExamSession and Questions and has_many :through relation between the intermediate table (for example QuestionsExamSession) and Alternative to point what alternatives are answers of the student on this Question. So the questions are: Is this scheme is too complicated and there is a way to do it simple and clear? Is there any way to organize models in such a way to make the form I want to work?

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• Hold i ajax call in every minute calling section

  - by gowri

  i am calling ajax every second in page.. Here the server page returns randomly generated number,using this number(converted into seconds) i am triggering another function in ajax success .it works My problem suppose random number = 5 means trigger() function called after 5 seconds using setTimeout,but rember ajax call is triggering every 1 second so trigger function also called many time. i want to make ajax call wait untill trigger function execution.Which means i wanna pause that ajax call untill 5 seconds after that resume How can i do this ? My coding //this ajax is called every minute $.ajax({ type: "POST", url: 'serverpage', data: ({pid:1}), success: function(msg) { var array = msg.split('/'); if(array[0]==1){ setTimeout(function() { trigger(msg); },array[1]+'000'); } } }); //and my trigger function function trigger(value) { alert("i am triggered !"); } server response maybe 1/2 or 1/5 or 1/ 10 or 1/1 here 1/3(this is converted into seconds)

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• Decimal Base Conversion using PYTHON

  - by Butinyane More

  PROBLEM DESCRIPTION Given a decimal number, and a new base to represent it in. If the base is larger than 10, use capital letters for the digits(that is, A is 10, B is 11 and so forth). The decimal number given, and the new base, will both be integer values, separated by a space. The base to convert to will always be smaller than or equal to 30. Please create a program that will convert a decimal number to any base in this instance. When evaluating the program the sample input must something like: 18 2 and the program must output the following: 10010 Please i beg of you to send me a solution to this problem as soon as possible.

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• Masked Edit Extender Format Issue

  - by Kumar

  I am using an ASP.NET AJAX Masked Edit Extender to format phone numbers <asp:TextBox ID="tbPhoneNumber" runat="server" /> <ajaxToolkit:MaskedEditExtender TargetControlID="tbPhoneNumber" Mask="(999)999-9999" MaskType="Number" InputDirection="LeftToRight" ClearMaskOnLostFocus="false" ClearTextOnInvalid="false" runat="server" AutoComplete="false" /> On the page load event I am trying to populate the phone textbox as follows: protected void Page_Load(object sender, EventArgs e) { tbPhoneNumber.Text = "(394)456-310"; } So there is one number which is missing at the end to make it a valid phone number. When the page loads I expected the value in the textbox to be (394)456-310_ But it displays (_39)445-6310 Why is this happening?

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• "Mem Usage" higher than "VM Size" in WinXP Task Manager

  - by Frederick

  In my Windows XP Task Manager, some processes display a higher value in the Mem Usage column than the VMSize. My Firefox instance, for example shows 111544 K as mem usage and 100576 K as VMSize. According to the help file of Task Manager Mem Usage is the working set of the process and VMSize is the committed memory in the Virtual address space. My question is, if the number of committed pages for a process is A and the number of pages in physical memory for the same process is B, shouldn't it always be B = A? Isn't the number of pages in physical memory per process a subset of the committed pages? Or is this something to do with sharing of memory among processes? Please explain. (Perhaps my definition of 'Working Set' is off the mark). Thanks.

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• To find first N prime numbers in python

  - by Rahul Tripathi

  Hi All, I am new to the programming world. I was just writing this code in python to generate N prime numbers. User should input the value for N which is the total number of prime numbers to print out. I have written this code but it doesn't throw the desired output. Instead it prints the prime numbers till the Nth number. For eg.: User enters the value of N = 7. Desired output: 2, 3, 5, 7, 11, 13, 19 Actual output: 2, 3, 5, 7 Kindly advise. i=1 x = int(input("Enter the number:")) for k in range (1, (x+1), 1): c=0 for j in range (1, (i+1), 1): a = i%j if (a==0): c = c+1 if (c==2): print (i) else: k = k-1 i=i+1

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• What is the regular expression for valdating a 'price' in a jtextfield

  - by wniroshan

  I want to validate a jtextfield as user inputs a price of some item. I have a perfectly working code which beeps and discard if user inputs some character that doesnt match the regular expression.(for regular expression "[0-9]+" it accepts any number of digits and beeps if a letter is given as input) But the problem is I want to validate an input like "12500.00". Format should be any number of digits before decimal point and two digits after the decimal point. eg: ddd.dd I tried the following regular expression. But the i doesnt allow user to input "." character. It allows user to input any number of digits but when "." key is pressed input is not accepted. here is the regular expression I used. "[0-9]+ | [0-9]+. | [0-9]+.[0-9]{1} | [0-9]+{2}" important: user input is validated character by character as the user inputs them to the jtextfield.

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• ASP.NET MaskedEditExtender issue

  - by Eyla

  I have asp.net textbox with MaskedEditExtender. I set ClearTextOnInvalid property to ture so when invalid text is entered should clear the text. in my case I have mask=(999)999-9999, when I enter forexample 4 number should then the focus lost should clear the text because i did not enter complete number that fit the mask?? what I want to clear the text when the focus lost if no complete number has entered!! here is my code: <asp:TextBox ID="txtHomePhone" runat="server" Style="top: 147px; left: 543px; position: absolute; height: 22px; width: 128px" ></asp:TextBox> <cc1:MaskedEditExtender ID="txtHomePhone_MEE" runat="server" CultureAMPMPlaceholder="" CultureCurrencySymbolPlaceholder="" CultureDateFormat="" CultureDatePlaceholder="" CultureDecimalPlaceholder="" CultureThousandsPlaceholder="" CultureTimePlaceholder="" Enabled="True" Mask="(999)999-9999" TargetControlID="txtHomePhone" AutoComplete="False" ClearMaskOnLostFocus="true" ClearTextOnInvalid="True"> </cc1:MaskedEditExtender>

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