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  • Finding N contiguous zero bits in an integer to the left of the MSB position of another integer

    - by James Morris
    The problem is: given an integer val1 find the position of the highest bit set (Most Significant Bit) then, given a second integer val2 find a contiguous region of unset bits, with the minimum number of zero bits given by width to the left of the position (ie, in the higher bits). Here is the C code for my solution: typedef unsigned int t; unsigned const t_bits = sizeof(t) * CHAR_BIT; _Bool test_fit_within_left_of_msb( unsigned width, t val1, t val2, unsigned* offset_result) { unsigned offbit = 0; unsigned msb = 0; t mask; t b; while(val1 >>= 1) ++msb; while(offbit + width < t_bits - msb) { mask = (((t)1 << width) - 1) << (t_bits - width - offbit); b = val2 & mask; if (!b) { *offset_result = offbit; return true; } if (offbit++) /* this conditional bothers me! */ b <<= offbit - 1; while(b <<= 1) offbit++; } return false; } Aside from faster ways of finding the MSB of the first integer, the commented test for a zero offbit seems a bit extraneous, but necessary to skip the highest bit of type t if it is set. I have also implemented similar algorithms but working to the right of the MSB of the first number, so they don't require this seemingly extra condition. How can I get rid of this extra condition, or even, are there far more optimal solutions? Edit: Some background not strictly required. The offset result is a count of bits from the high bit, not from the low bit as maybe expected. This will be part of a wider algorithm which scans a 2D array for a 2D area of zero bits. Here, for testing, the algorithm has been simplified. val1 represents the first integer which does not have all bits set found in a row of the 2D array. From this the 2D version would scan down which is what val2 represents. Here's some output showing success and failure: t_bits:32 t_high: 10000000000000000000000000000000 ( 2147483648 ) --------- ----------------------------------- *** fit within left of msb test *** ----------------------------------- val1: 00000000000000000000000010000000 ( 128 ) val2: 01000001000100000000100100001001 ( 1091569929 ) msb: 7 offbit:0 + width: 8 = 8 mask: 11111111000000000000000000000000 ( 4278190080 ) b: 01000001000000000000000000000000 ( 1090519040 ) offbit:8 + width: 8 = 16 mask: 00000000111111110000000000000000 ( 16711680 ) b: 00000000000100000000000000000000 ( 1048576 ) offbit:12 + width: 8 = 20 mask: 00000000000011111111000000000000 ( 1044480 ) b: 00000000000000000000000000000000 ( 0 ) offbit:12 iters:10 ***** found room for width:8 at offset: 12 ***** ----------------------------------- *** fit within left of msb test *** ----------------------------------- val1: 00000000000000000000000001000000 ( 64 ) val2: 00010000000000001000010001000001 ( 268469313 ) msb: 6 offbit:0 + width: 13 = 13 mask: 11111111111110000000000000000000 ( 4294443008 ) b: 00010000000000000000000000000000 ( 268435456 ) offbit:4 + width: 13 = 17 mask: 00001111111111111000000000000000 ( 268402688 ) b: 00000000000000001000000000000000 ( 32768 ) ***** mask: 00001111111111111000000000000000 ( 268402688 ) offbit:17 iters:15 ***** no room found for width:13 ***** (iters is the count of iterations of the inner while loop)

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  • MapReduce for counting parameter values

    - by cnkt
    I have document like this: { "_id": ObjectId("4d17c7963ffcf60c1100002f"), "title": "Text", "params": { "brand": "BMW", "model": "i3" } } { "_id": ObjectId("4d17c7963ffcf60c1100002f"), "title": "Text", "params": { "brand": "BMW", "model": "i5" } } What i need is the count of every params values. like: brand --------- BMW (2) model --------- i3 (1) i5 (1) I think i have to write map/reduce functions. How can i do this? Thanks.

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  • Is derived table executed once or three times?

    - by AspOnMyNet
    Every time you make use of a derived table, that query is going to be executed. When using a CTE, that result set is pulled back once and only once within a single query. Does the quote suggest that the following query will cause derived table to be executed three times ( once for each aggregate function’s call ): SELECT AVG(OrdersPlaced),MAX(OrdersPlaced),MIN(OrdersPlaced) FROM ( SELECT v.VendorID, v.[Name] AS VendorName, COUNT(*) AS OrdersPlaced FROM Purchasing.PurchaseOrderHeader AS poh INNER JOIN Purchasing.Vendor AS v ON poh.VendorID = v.VendorID GROUP BY v.VendorID, v.[Name] ) AS x thanx

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  • DataGridView fails SelectedCells property

    - by ghiboz
    Hi! in my project I have 3 DataGridView and I need to retrieve the SelectedCells of the grid in 2 grids this works fine, but in one ( and the code is exactly the same of the other 2) the grid.SelectedCells.Count is 1 but If I go in the inspector to view which cell is selected, the result is 0,0... thanks

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  • python programme.

    - by siva
    hi, i am siva this is frist time taken the python programming language i have a small problem please help me the question is **Write two functions, called countSubStringMatch and countSubStringMatchRecursive that take two arguments, a key string and a target string. These functions iteratively and recursively count the number of instances of the key in the target string. You should complete definitions for def countSubStringMatch(target,key): and def countSubStringMatchRecursive (target, key): **

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  • What is faster in MySQL? WHERE sub request = 0 or IN list

    - by Nicolas Manzini
    Hello I was wondering what is better in MySQL. I have a SELECT querry that exclude every entry associated to a banned userID currently I have a subquerry clause in the WHERE statement that goes like AND (SELECT COUNT(*) FROM TheBlackListTable WHERE userID = userList.ID AND blackListedID = :userID2 ) = 0 Which will accept every userID not present in the TheBlackListTable Would it be faster to retrieve first all Banned ID in a previous request and replace the previous clause by AND creatorID NOT IN listOfBannedID Thank you!

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  • How can I read a binary string in C#?

    - by Sergey
    There is a php script which sends a binary string to the client application: $binary_string = pack('i',count($result_matrix)); foreach ($result_matrix as $row) { foreach ($row as $cell) { $binary_string .= pack('d',$cell); } } echo $binary_string; Silverlight application receives $binary_string via POST protocol. How can I parse this binary string? Or maybe there is a better way to send matrix from PHP to Silverlight?

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  • Expression Too Complex In Access 2007

    - by Jazzepi
    When I try to run this query in Access through the ODBC interface into a MySQL database I get an "Expression too complex in query expression" error. The essential thing I'm trying to do is translate abbreviated names of languages into their full body English counterparts. I was curious if there was some way to "trick" access into thinking the expression is smaller with sub queries, or if someone else had a better idea of how to solve this problem. I thought about making a temporary table and doing a join on it, but that's not supported in Access SQL. Just as an FYI, the query worked fine until I added the big long IFF chain. I tested the query on a smaller IFF chain for three languages, and that wasn't an issue, so the problem definitely stems from the huge IFF chain (It's 26 deep). Also, I might be able to drop some of the options (like combining the different forms of Chinese or Portuguese) As a test, I was able to get the SQL query to work after paring it down to 14 IFF() statements, but that's a far cry from the 26 languages I'd like to represent. SELECT TOP 5 Count( * ) AS [Number of visits by language], IIf(login.lang="ar","Arabic",IIf(login.lang="bg","Bulgarian",IIf(login.lang="zh_CN","Chinese (Simplified Han)",IIf(login.lang="zh_TW","Chinese (Traditional Han)",IIf(login.lang="cs","Czech",IIf(login.lang="da","Danish",IIf(login.lang="de","German",IIf(login.lang="en_US","United States English",IIf(login.lang="en_GB","British English",IIf(login.lang="es","Spanish",IIf(login.lang="fr","French",IIf(login.lang="el","Greek",IIf(login.lang="it","Italian",IIf(login.lang="ko","Korean",IIf(login.lang="hu","Hungarian",IIf(login.lang="nl","Dutch",IIf(login.lang="pl","Polish",IIf(login.lang="pt_PT","European Portuguese",IIf(login.lang="pt_BR","Brazilian Portuguese",IIf(login.lang="ru","Russian",IIf(login.lang="sk","Slovak",IIf(login.lang="sl","Slovenian","IIf(login.lang="fi","Finnish",IIf(login.lang="sv","Swedish",IIf(login.lang="tr","Turkish","Unknown")))))))))))))))))))))))))) AS [Language] FROM login, reservations, reservation_users, schedules WHERE (reservations.start_date Between DATEDIFF('s','1970-01-01 00:00:00',[Starting Date in the Following Format YYYY/MM/DD]) And DATEDIFF('s','1970-01-01 00:00:00',[Ending Date in the Following Format YYYY/MM/DD])) And reservations.is_blackout=0 And reservation_users.memberid=login.memberid And reservation_users.resid=reservations.resid And reservation_users.invited=0 And reservations.scheduleid=schedules.scheduleid And scheduletitle=[Schedule Title] GROUP BY login.lang ORDER BY Count( * ) DESC; @ Michael Todd I completely agree. The list of languages should have been a table in the database and the login.lang should have been a FK into that table. Unfortunately this isn't how the database was written, and it's not really mine to modify. The languages are placed into the login.lang field by the PHP running on top of the database.

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  • Using FindAll on a List<List<T>> type

    - by Ken Foster
    Assuming public class MyClass { public int ID {get; set; } public string Name {get; set; } } and List<MyClass> classList = //populate with MyClass instances of various IDs I can do List<MyClass> result = classList.FindAll(class => class.ID == 123); and that will give me a list of just classes with ID = 123. Works great, looks elegant. Now, if I had List<List<MyClass>> listOfClassLists = //populate with Lists of MyClass instances How do I get a filtered list where the lists themselves are filtered. I tried List<List<MyClass>> result = listOfClassLists.FindAll (list => list.FindAll(class => class.ID == 123).Count > 0); it looks elegant, but doesn't work. It only includes Lists of classes where at least one class has an ID of 123, but it includes ALL MyClass instances in that list, not just the ones that match. I ended up having to do List<List<MyClass>> result = Results(listOfClassLists, 123); private List<List<MyClass>> Results(List<List<MyClass>> myListOfLists, int id) { List<List<MyClass>> results = new List<List<MyClass>>(); foreach (List<MyClass> myClassList in myListOfLists) { List<MyClass> subList = myClassList.FindAll(myClass => myClass.ID == id); if (subList.Count > 0) results.Add(subList); } return results; } which gets the job done, but isn't that elegant. Just looking for better ways to do a FindAll on a List of Lists. Ken

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  • SQL Server 2008 FTS CONTAINSTABLE Not Returning More Than Five Rows

    - by Elijah Glover
    I have a single table called "Indexes", it contains one nvarchar and three ntext columns (all Full Text Indexes). Index is up to date. CONTAINSTABLE(Indexes, *), 'test', 5) //5 results No matter what I change the above keyword too, it only returns the first 3-5 results. It should roughly return 90-120 results, for the above query. SELECT count(*) FROM Indexes WHERE [Description] like '%test%' //122 results How would I start to troubleshoot this problem?

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  • Android Notification Bar Number

    - by JonF
    I've been able to successfully display the notification number count on the Android emulator. However, it doesn't display anything when I use it on an actual Android phone. Any suggestions on why there might be a difference?

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  • Active User Tracking, PHP Sessions

    - by Nik
    Alright, I'm trying to work on a function for active user counting in an AJAX based application. I want to express the below SQL Query in correct syntax but I'm not sure how to write it. The desired SQL Query is below: SELECT count(*) FROM active WHERE timestamp > time() - 1800 AND nick=(a string that doesn't contain [AFK]) Now, I do understand that time() - 1800 can be assigned to a variable, but how is timestamp > variable and nick that doesn't contain a string written in SQL?

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  • auto complete asp.net

    - by lodun
    Why my autocomplete ajax script does not work: This is my WebService.cs: using System; using System.Data; using System.Web; using System.Collections; using System.Web.Services; using System.Web.Services.Protocols; using System.ComponentModel; using System.Data.SqlClient; using System.Collections.Generic; using System.Configuration; using System.Web.Script.Services; [ScriptService] [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. public class WebService : System.Web.Services.WebService { public WebService () { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod] public string[] GetCountryInfo(string prefixText, int count) { string sql = "Select * from questions Where username like @prefixText"; SqlDataAdapter da = new SqlDataAdapter(sql,"estudent_piooConnectionString"); da.SelectCommand.Parameters.Add("@prefixText", SqlDbType.VarChar, 50).Value = prefixText + "%"; DataTable dt = new DataTable(); da.Fill(dt); string[] items = new string[dt.Rows.Count]; int i = 1; foreach (DataRow dr in dt.Rows) { items.SetValue(dr["username"].ToString(),i); i++; } return items; } } my css: /*AutoComplete flyout */ .autocomplete_completionListElement { margin : 0px!important; background-color : inherit; color : windowtext; border : buttonshadow; border-width : 1px; border-style : solid; cursor : 'default'; overflow : auto; height : 200px; text-align : left; list-style-type : none;padding:0px; } /* AutoComplete highlighted item */ .autocomplete_highlightedListItem { background-color: #ffff99; color: black; padding: 1px; } /* AutoComplete item */ .autocomplete_listItem { background-color : window; color : windowtext; padding : 1px; } and textbox: <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" CompletionListCssClass="autocomplete_completionListElement" CompletionListItemCssClass="autocomplete_listItem" CompletionSetCount="20" CompletionInterval="1000" DelimiterCharacters=";,:" CompletionListHighlightedItemCssClass="autocomplete_highlightedList MinimumPrefixLength="1" ServiceMethod="GetCountryInfo" ShowOnlyCurrentWordInCompletionListItem="true" TargetControlID="TextBox2" ServicePath="WebService.asmx" runat="server"></cc1:AutoCompleteExtender>

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  • How can I sum up the lines added/removed by a user in a git repo?

    - by Mike
    I am trying to find the total number of lines added and total number of lines removed by a user in a git repository. I looked at http://stackoverflow.com/questions/1265040/how-to-count-total-lines-changed-by-a-specific-author-in-a-git-repository, which had the command git log --author="<authorname>" --pretty=tformat: --numstat, but the answer failed to give a script(however simple) to total the lines changed. What's the simplest way to sum up the lines added/removed?

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  • how to retrieve distinct values from multiple columns

    - by ANIL MANE
    Hello Experts, I have a flat text file data which I import into MSSQL table. It creates and table with specified name along with multiple columns as per data file. now I need a query which will return the data and its count. e.g. data file : BREAD,MILK BREAD,DIAPER,BEER,EGGS MILK,DIAPER,BEER,COKE BREAD,MILK,DIAPER,BEER BREAD,MILK,DIAPER,COKE BREAD,ICE,MANGO JUICE,BURGER Result should be BREAD | 5 MILK | 4 DIAPER| 4 and so on.

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  • VBA Excel - Workbook_SheetChange

    - by user2947014
    Hopefully this question hasn't already been asked, I tried searching for an answer and couldn't find anything. This is probably a simple question, but I am writing my first macro in excel and am having a problem that I can't find out a solution to. I wrote a couple of macros that basically sum up columns dynamically (so that the number of rows can change and the formula moves down automatically) based on a value in another column of the same row, and I call those macros from the event Workbook_SheetChange. The problem I'm having is, I change a cell's value from my macro to display the result of the sum, and this then calls Workbook_SheetChange again, which I do not want. Right now it works, but I can trace it and see that Workbook_SheetChange is being called multiple times. This is preventing me from adding other cell changes to the macros, because then it results in an infinite loop. I want the macros to run every time a change is made to the sheet, but I don't see any way around allowing the macros to change a cell's value, so I don't know what to do. I will paste my code below, in case it is helpful. Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range) Dim Row As Long Dim Col As Long Row = Target.Row Col = Target.Column If Col <> 7 Then Range("G" & Row).Select Selection.Formula = "=IF(F" & Row & "=""Win"",E" & Row & ",IF(F" & Row & "=""Loss"",-D" & Row & ",0))" Target.Select End If Call SumRiskColumn End Sub Private Sub Workbook_SheetCalculate(ByVal Sh As Object) Call SumOutcomeColumn End Sub Sub SumOutcomeColumn() Dim N As Long N = Cells(Rows.Count, "A").End(xlUp).Row Cells(N + 1, "G").Formula = "=SUM(G2:G" & N & ")" End Sub Sub SumRiskColumn() Dim N As Long N = Cells(Rows.Count, "A").End(xlUp).Row Dim CurrTotalRisk As Long CurrTotalRisk = 0 For i = 2 To N If IsEmpty(ActiveSheet.Cells(i, 6)) And Not IsEmpty(ActiveSheet.Cells(i, 1)) And Not IsEmpty(ActiveSheet.Cells(i, 2)) And Not IsEmpty(ActiveSheet.Cells(i, 3)) Then CurrTotalRisk = CurrTotalRisk + ActiveSheet.Cells(i, 4).Value End If Next i Cells(N + 1, "D").Value = CurrTotalRisk End Sub Thank you for any help you can give me! I really appreciate it.

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  • How many books have Grady Booch foreworded?

    - by Monis Iqbal
    I knew of two very popular books foreworded by the great software engineer himself: Design Patterns by GoF and J2EE Design Patterns. But when I googled about forewords written by Grady Booch then there were quite a few more books than I anticipated. Do we know the exact count? is he the leading foreword writer in the IT world?

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  • SaveFileDialog problem (C#) (VS2008)

    - by typoknig
    Hi all, I am having an issue with SaveFileDialog for some reason. All I want to do is extract data from a text box line by line and write it to a text file, then save that text file to the desktop. The first bit of code works fine (though it doesn't save to the desktop). The second bit of code is what I want to use, but when it creates the text file the text file is empty. What did I do wrong in my second bit of code? This code works, but it does not save to the desktop and it isn't as nice as the second code. //When the Save button is clicked the contents of the text box will be written to a text file. private void saveButton_Click(object sender, EventArgs e) { int textBoxLines = textBox.Lines.Count(); if (File.Exists(saveFile)) { result = MessageBox.Show("The file " + saveFile + " already exists.\r\nDo you want to replace it?", "File Already Exists!", MessageBoxButtons.YesNo); if (result == DialogResult.Yes) { TextWriter tw1 = new StreamWriter(saveFile); for (int i = 0; i < textBoxLines; i++) { tw1.WriteLine(textBox.Lines.GetValue(i)); } tw1.Close(); } if (result == DialogResult.No) { MessageBox.Show("Please move or rename existing " + saveFile + "\r\nBefore attempting to save again.", "Message"); } } else { TextWriter tw2 = new StreamWriter(saveFile); for (int i = 0; i < textBoxLines; i++) { tw2.WriteLine(textBox.Lines.GetValue(i)); } tw2.Close(); } } This code does not work, but it is what I want to use. //When the Save button is clicked the contents of the text box will be written to a text file. private void saveButton_Click(object sender, EventArgs e) { int textBoxLines = textBox.Lines.Count(); Stream saveStream; SaveFileDialog saveDialog = new SaveFileDialog(); saveDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"; saveDialog.FilterIndex = 2; saveDialog.RestoreDirectory = true; saveDialog.FileName = (saveFile); saveDialog.InitialDirectory = (Environment.GetFolderPath(Environment.SpecialFolder.Desktop)); if (saveDialog.ShowDialog() == DialogResult.OK) { if ((saveStream = saveDialog.OpenFile()) != null) { StreamWriter tw = new StreamWriter(saveStream); for (int i = 0; i < textBoxLines; i++) { tw.WriteLine(textBox.Lines.GetValue(i)); } saveStream.Close(); } } }

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  • Can I somehow know which replacement is taking place from within a callback of preg_replace_callback

    - by jayarjo
    I'm using preg_replace_callback to substitute particular tokens within the string. But apart from actual token I need to know as well whether that token was first, second or third in a subject string. Is there any way to access that info? I found an argument $count in preg_replace_callback definition (http://php.net/manual/en/function.preg-replace-callback.php), which counts replacements, but I'm not sure if it is accessible from within callback. Any example of the usage in described context?

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  • Counting words in a collection using LINQ

    - by icemanind
    Guys, I have a StringCollection object with 5 words in them. 3 of them are duplicate words. I am trying to create a LINQ query that will count how many unique words are in the collection and output them to to the console. So, for example, if my StringCollection has 'House', 'Car,'House','Dog', 'Cat', then it should output like this: House -- 2 Car -- 1 Dog -- 1 Cat -- 1 any ideas on how to create a LINQ query to do this?

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  • RichEdit control: Determine when text is changed?

    - by Rosarch
    I'm trying to count the number of times that text is changed in a given RichEdit control. I considered using events like key down, but that gets messy when you consider keys that don't change the text (like arrows, page up, etc). And how do you make sure you get all of those keys? It seems it would be simpler to register a callback for a onTextChanged event, if one exists. Is there any way to do something like that?

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  • Please Help me to create a replace function in vb.net

    - by Rajesh Rolen- DotNet Developer
    Please Help me in creating a replace function. Problem: Their is a alfanumeric value of any lenght (string) and i want to replace its all characters with 'X' except right four characters Like : Value : 4111111111111111 Result Should be: XXXXXXXXXXXX1111 I have created a function but got stuck: public function myfunction(str as string) str.Replace(str.Substring(0, str.Length - 5), 'X') 'but here i want no of x to be equvals to count of lenght of str - 4 end function please tell me a better fuction to perform such a operation

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