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  • How to find pythagorean triplets in an array faster than O(N^2)?

    - by SS
    Can someone suggest an algorithm that finds all Pythagorean triplets among numbers in a given array? If it's possible, please, suggest an algorithm faster than O(n2). Pythagorean triplet is a set {a,b,c} such that a2 = b2 + c2. Example: for array [9, 2, 3, 4, 8, 5, 6, 10] the output of the algorithm should be {3, 4, 5} and {6, 8, 10}.

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  • Why is my RAID /dev/md1 showing up as /dev/md126? Is mdadm.conf being ignored?

    - by mmorris
    I created a RAID with: sudo mdadm --create --verbose /dev/md1 --level=mirror --raid-devices=2 /dev/sdb1 /dev/sdc1 sudo mdadm --create --verbose /dev/md2 --level=mirror --raid-devices=2 /dev/sdb2 /dev/sdc2 sudo mdadm --detail --scan returns: ARRAY /dev/md1 metadata=1.2 name=ion:1 UUID=aa1f85b0:a2391657:cfd38029:772c560e ARRAY /dev/md2 metadata=1.2 name=ion:2 UUID=528e5385:e61eaa4c:1db2dba7:44b556fb Which I appended it to /etc/mdadm/mdadm.conf, see below: # mdadm.conf # # Please refer to mdadm.conf(5) for information about this file. # # by default (built-in), scan all partitions (/proc/partitions) and all # containers for MD superblocks. alternatively, specify devices to scan, using # wildcards if desired. #DEVICE partitions containers # auto-create devices with Debian standard permissions CREATE owner=root group=disk mode=0660 auto=yes # automatically tag new arrays as belonging to the local system HOMEHOST <system> # instruct the monitoring daemon where to send mail alerts MAILADDR root # definitions of existing MD arrays # This file was auto-generated on Mon, 29 Oct 2012 16:06:12 -0500 # by mkconf $Id$ ARRAY /dev/md1 metadata=1.2 name=ion:1 UUID=aa1f85b0:a2391657:cfd38029:772c560e ARRAY /dev/md2 metadata=1.2 name=ion:2 UUID=528e5385:e61eaa4c:1db2dba7:44b556fb cat /proc/mdstat returns: Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md2 : active raid1 sdb2[0] sdc2[1] 208629632 blocks super 1.2 [2/2] [UU] md1 : active raid1 sdb1[0] sdc1[1] 767868736 blocks super 1.2 [2/2] [UU] unused devices: <none> ls -la /dev | grep md returns: brw-rw---- 1 root disk 9, 1 Oct 30 11:06 md1 brw-rw---- 1 root disk 9, 2 Oct 30 11:06 md2 So I think all is good and I reboot. After the reboot, /dev/md1 is now /dev/md126 and /dev/md2 is now /dev/md127????? sudo mdadm --detail --scan returns: ARRAY /dev/md/ion:1 metadata=1.2 name=ion:1 UUID=aa1f85b0:a2391657:cfd38029:772c560e ARRAY /dev/md/ion:2 metadata=1.2 name=ion:2 UUID=528e5385:e61eaa4c:1db2dba7:44b556fb cat /proc/mdstat returns: Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc2[1] sdb2[0] 208629632 blocks super 1.2 [2/2] [UU] md127 : active (auto-read-only) raid1 sdb1[0] sdc1[1] 767868736 blocks super 1.2 [2/2] [UU] unused devices: <none> ls -la /dev | grep md returns: drwxr-xr-x 2 root root 80 Oct 30 11:18 md brw-rw---- 1 root disk 9, 126 Oct 30 11:18 md126 brw-rw---- 1 root disk 9, 127 Oct 30 11:18 md127 All is not lost, I: sudo mdadm --stop /dev/md126 sudo mdadm --stop /dev/md127 sudo mdadm --assemble --verbose /dev/md1 /dev/sdb1 /dev/sdc1 sudo mdadm --assemble --verbose /dev/md2 /dev/sdb2 /dev/sdc2 and verify everything: sudo mdadm --detail --scan returns: ARRAY /dev/md1 metadata=1.2 name=ion:1 UUID=aa1f85b0:a2391657:cfd38029:772c560e ARRAY /dev/md2 metadata=1.2 name=ion:2 UUID=528e5385:e61eaa4c:1db2dba7:44b556fb cat /proc/mdstat returns: Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md2 : active raid1 sdb2[0] sdc2[1] 208629632 blocks super 1.2 [2/2] [UU] md1 : active raid1 sdb1[0] sdc1[1] 767868736 blocks super 1.2 [2/2] [UU] unused devices: <none> ls -la /dev | grep md returns: brw-rw---- 1 root disk 9, 1 Oct 30 11:26 md1 brw-rw---- 1 root disk 9, 2 Oct 30 11:26 md2 So once again, I think all is good and I reboot. Again, after the reboot, /dev/md1 is /dev/md126 and /dev/md2 is /dev/md127????? sudo mdadm --detail --scan returns: ARRAY /dev/md/ion:1 metadata=1.2 name=ion:1 UUID=aa1f85b0:a2391657:cfd38029:772c560e ARRAY /dev/md/ion:2 metadata=1.2 name=ion:2 UUID=528e5385:e61eaa4c:1db2dba7:44b556fb cat /proc/mdstat returns: Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc2[1] sdb2[0] 208629632 blocks super 1.2 [2/2] [UU] md127 : active (auto-read-only) raid1 sdb1[0] sdc1[1] 767868736 blocks super 1.2 [2/2] [UU] unused devices: <none> ls -la /dev | grep md returns: drwxr-xr-x 2 root root 80 Oct 30 11:42 md brw-rw---- 1 root disk 9, 126 Oct 30 11:42 md126 brw-rw---- 1 root disk 9, 127 Oct 30 11:42 md127 What am I missing here?

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  • Force RAID to read "exiled" disk?

    - by user197015
    We have a RAID 6 array (Infortrend EonStor DS S16F) that recently had two disks fail. Immediately prior to replacing these two disks, a third, good, disk was accidentally ejected from the array. After reinserting this disk it is marked as "exiled" by the array's firmware, and so even after replacing the two failed disks with new ones the array refuses to rebuild the logical volume and remains inaccessible. Since the temporarily-ejected disk is still functional and nothing has been written to the array since it was ejected, it seems that it should theoretically be possible to recover all the data on the array, but how can we convince the array to use the data from the "exiled" disk? Thanks for any help or advice you can offer.

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  • Using DisplayTag library, I want to have the currently selected row have a unique custom class using

    - by Mary
    I have been trying to figure out how to highlight the selected row in a table. In my jsp I have jsp scriplet that can get access to the id of the row the displaytag library is creating. I want to compare it to the the id of the current row selected by the user ${currentNoteId}. Right now if the row id = 849 (hardcoded) the class "currentClass" is added to just that row of the table. I need to change the 849 for the {$currentNoteId} and I don't know how to do it. I am using java, Spring MVC. The jsp: ... <% request.setAttribute("dyndecorator", new org.displaytag.decorator.TableDecorator() { public String addRowClass() { edu.ilstu.ais.advisorApps.business.Note row = (edu.ilstu.ais.advisorApps.business.Note)getCurrentRowObject(); String rowId = row.getId(); if ( rowId.equals("849") ) { return "currentClass"; } return null; } }); %> <c:set var="currentNoteId" value="${studentNotes.currentNote.id}"/> ... <display:table id="noteTable" name="${ studentNotes.studentList }" pagesize="20" requestURI="notesView.form.html" decorator="dyndecorator"> <display:column title="Select" class="yui-button-match" href="/notesView.form.html" paramId="note.id" paramProperty="id"> <input type="button" class="yui-button-match2" name="select" value="Select"/> </display:column> <display:column property="userName" title="Created By" sortable="true"/> <display:column property="createDate" title="Created On" sortable="true" format="{0,date,MM/dd/yy hh:mm:ss a}"/> <display:column property="detail" title="Detail" sortable="true"/> </display:table> ... This could also get done using javascript and that might be best, but the documentation suggested this so I thought I would try it. I cannot find an example anywhere using the addRowClass() unless the comparison is to a field already in the row (a dollar amount is used in the documentation example) or hardcoded in like the "849" id. Thanks for any help you can provide.

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  • Is there a non-unique-key sorted list generic collection in C#?

    - by kdt
    I'm a bit surprised by System.Collections.Generic.SortedList, in that It requires me to use <key, value> instead of <value>(comparer) It only allows on entry per value These seem quirky in the way I want to use it (although I'm sure they're just right for other situations). Is there another collection that doesn't have these two characteristics?

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  • LIST<> AddRange throwing ArgumentException

    - by Tim
    Hi all, I have a particular method that is occasionally crashing with an ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds.: at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length, Boolean reliable) at System.Collections.Generic.List`1.CopyTo(T[] array, Int32 arrayIndex) at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection) at System.Collections.Generic.List`1.AddRange(IEnumerable`1 collection) The code that is causing this crash looks something like this: List<MyType> objects = new List<MyType>(100); objects = FindObjects(someParam); objects.AddRange(FindObjects(someOtherParam); According to MSDN, List<.AddRange() should automatically resize itself as needed: If the new Count (the current Count plus the size of the collection) will be greater than Capacity, the capacity of the List<(Of <(T)) is increased by automatically reallocating the internal array to accommodate the new elements, and the existing elements are copied to the new array before the new elements are added. Can someone think of a circumstance in which AddRange could throw this type of exception?

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  • How to create multi-dimensional jagged arrays in VbScript ?

    - by vandana268
    I need to create multi-dimensional array of strings. Each row of the array can have varying number of strings. Something like the follwing code: twoDimension = Array(Array()) ReDim Preserve twoDimension(3) For i = 0 to 2 If i = 1 Then twoDimension(i) = Array(1,2,3) End If If i = 2Then twoDimension(i) = Array(1,2,3,4,5) End If Next

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  • PHP splitting arrays into groups based on one field's value

    - by Dan
    I have an array containing arrays of names and other details, in alphabetical order. Each array includes the first letter associated with the name. Array ( [0] => Array ( [0] => a [1] => Alanis Morissette ) [1] => Array ( [0] => a [1] => Alesha Dixon ) [2] => Array ( [0] => a [1] => Alexandra Burke ) [3] => Array ( [0] => b [1] => Britney Spears ) [4] => Array ( [0] => b [1] => Bryan Adams ) ) I'd like to display them grouped by that first initial, eg: A - Alanis Morissette Alesha Dixon Alexandra Burke B - Britney Spears Bryan Adams etc... Is this at all possible?

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  • NSObject release destroys local copy of object's data

    - by Spider-Paddy
    I know this is something stupid on my part but I don't get what's happening. I create an object that fetches data & puts it into an array in a specific format, since it fetches asynchronously (has to download & parse data) I put a delegate method into the object that needs the data so that the data fetching object copies it's formatted array into an array in the calling object. The problem is that when the data fetching object is released, the copy it created in the caller is being erased, code is: In .h file @property (nonatomic, retain) NSArray *imagesDataSource; In .m file // Fetch item details ImagesParser *imagesParserObject = [[ImagesParser alloc] init:self]; [imagesParserObject getArticleImagesOfArticleId:(NSInteger)currentArticleId]; [imagesParserObject release] <-- problematic release // Called by parser when images parsing is finished -(void)imagesDataTransferComplete:(ImagesParser *)imagesParserObject { self.imagesDataSource = [ImagesParserObject.returnedArray copy]; // copy array to local variable // If there are more pics, they must be assembled in an array for possible UIImageView animation NSInteger picCount = [imagesDataSource count]; if(picCount > 1) // 1 image is assumed to be the pic already displayed { // Build image array NSMutableArray *tempPicArray = [[NSMutableArray alloc] init]; // Temp space to hold images while building for(int i = 0; i < picCount; i++) { // Get Nr from only article in detailDataSource & pic name (Small) from each item in imagesDataSource NSString *picAddress = [NSString stringWithFormat:@"http://some.url.com/shopdata/image/article/%@/%@", [[detailDataSource objectAtIndex:0] objectForKey:@"Nr"], [[imagesDataSource objectAtIndex:i] objectForKey:@"Small"]]; NSURL *picURL = [NSURL URLWithString:picAddress]; NSData *picData = [NSData dataWithContentsOfURL:picURL]; [tempPicArray addObject:[UIImage imageWithData:picData]]; } imagesArray = [tempPicArray copy]; // copy makes immutable copy of array [tempPicArray release]; currentPicIndex = 0; // Assume first pic is pic already being shown } else imagesArray = nil; // No need for a needless pic array // Remove please wait message [pleaseWaitViewControllerObject.view removeFromSuperview]; } I put in tons of NSLog lines to keep track of what was going on & self.imagesDataSource is populated with the returned array but when the parser object is released self.imagesDataSource becomes empty. I thought self.imagesDataSource = [ImagesParserObject.returnedArray copy]; is supposed to make an independant object, like as if it was alloc, init'ed, so that self.imagesDataSource is not just a pointer to the parser's array but is it's own array. So why does the release of the parser object clear the copy of the array. (I checked & double checked that it's not something overwriting self.imagesDataSource, commenting out [imagesParserObject release] consistently fixes the problem) Also, I have exactly the same problem with self.detailDataSource which is declared & populated in the exact same way as self.imagesDataSource I thought that once I call the parser I could release it because the caller no longer needs to refer to it, all further activity is carried out by the parser object through it's delegate method, what am I doing wrong?

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  • Simulating pass by reference for an array reference (i.e. a reference to a reference) in Java

    - by Leif Andersen
    I was wondering, in java, is it possible to in anyway, simulate pass by reference for an array? Yes, I know the language doesn't support it, but is there anyway I can do it. Say, for example, I want to create a method that reverses the order of all the elements in an array. (I know that this code snippet isn't the best example, as there is a better algorithms to do this, but this is a good example of the type of thing I want to do for more complex problems). Currently, I need to make a class like this: public static void reverse(Object[] arr) { Object[] tmpArr = new Object[arr.length]; count = arr.length - 1; for(Object i : arr) tmpArr[count--] = i; // I would like to do arr = tmpArr, but that will only make the shallow // reference tmpArr, I would like to actually change the pointer they passed in // Not just the values in the array, so I have to do this: count = arr.length - 1; for(Object i : tmpArr) arr[count--] = i; return; } Yes, I know that I could just swap the values until I get to the middle, and it would be much more efficient, but for other, more complex purposes, is there anyway that I can manipulate the actual pointer? Again, thank you.

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  • Zend Framework - validators are not working anymore?

    - by Pavel Dubinin
    Eariler I happily used the following code for creating form elements (inside Zend_Form descendant): //Set for options $this->setOptions(array( 'elements' => array( 'title' => array( 'type' => 'text', 'options' => array( 'required' => true, 'label' => 'Title', 'filters' => array('StringTrim'), 'validators' => array( array('StringLength', false, array('minLength'=>1, 'maxLength'=>50)), ), ) ) )); But now I've noticed that validators are not working.. I suspect this might be due to zend updates.. Does anyone face this problem?

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  • How can i count the number of unique instances of IP address in the following string in ruby

    - by kamal
    "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" "10.1.3.1" nil "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" "10.1.3.4" nil "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" "10.1.3.10" nil "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" "10.1.3.11" nil "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" "10.1.3.12" nil "10.1.3.30" "10.1.3.30" nil "10.1.3.38" "10.1.3.38" "10.1.3.38" "10.1.3.38" "10.1.3.38" nil "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" "10.1.3.55" nil "10.1.3.60" "10.1.3.60" "10.1.3.60" "10.1.3.60" "10.1.3.60" "10.1.3.60" "10.1.3.60" nil "10.1.3.66" "10.1.3.66" "10.1.3.66" "10.1.3.66" "10.1.3.66" "10.1.3.66" "10.1.3.66" nil "10.1.3.101" "10.1.3.101" nil "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" "10.1.3.102" nil "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" "10.1.3.103" nil "10.1.3.104" "10.1.3.104" nil "10.1.3.106" "10.1.3.106" nil "10.1.3.107" "10.1.3.107" "10.1.3.107" "10.1.3.107" "10.1.3.107" "10.1.3.107" "10.1.3.107" nil "10.1.3.108" "10.1.3.108" "10.1.3.108" "10.1.3.108" "10.1.3.108" "10.1.3.108" nil "10.1.3.110" "10.1.3.110" "10.1.3.110" "10.1.3.110" "10.1.3.110" nil the above string is stdout of: #!/usr/bin/ruby require "rubygems" require "fastercsv" scannedIPs = Hash.new(0) count = 0 FCSV.foreach("HOUND-1.csv", :headers => true, :skip_blanks => false) do |row| text = row[1] p text end

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  • URL length and content optimised for SEO [closed]

    - by Brendan Vogt
    Possible Duplicate: What is the best stucture of SEO friendly URL? I have done some reading on what URLS should look like for search engine optimisation, but I am curious to know how mine would like, I need some advice. I have a tutorial website, and my categories is something like: Web Development -> Client Side -> JavaScript So if I have a tutorial called "What is JavaScript?", is it good to have a URL that looks something like: www.MyWebsite.com/web-development/client-side/javascript/what-is-javascipt Or would something like this be more appropriate: www.MyWebsite.com/tutorials/what-is-javascipt Just curious because I also read that it is wise to have keywords in your URLs. Do I need to add the identifiers of each categories in the link as well, something like: www.MyWebsite.com/1/web-development/5/client-side/15/javascript/100/what-is-javascipt 1 is the unique identifier (primary key) of category web development 5 is the unique identifier (primary key) of category client side 15 is the unique identifier (primary key) of category javascript 100 is the unique identifier (primary key) of tutorial what is javascript

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  • How to call a .NET COM method with an array from delphi using PSafeArray?

    - by Sebastian Godelet
    Hello. I have an .NET (4.0) interface which is implemented with a ServicedComponent COM+ class: interface DotNetIface { void MethodRef(var System.Guid guid); void MethodArray(System.Guid[] guids, params object[] parameters); void MethodCStyle([MarshalAs(UnmanagedType.LPArray, ArraySubType=UnmanagedType.Struct, SizeConst=5)]System.Guid[] guids); } Now I used the Delphi 2007 import wizard to import the type library, and as expected I get the following signatures: procedure MethodRef(var guid : TGuid); procedure MethodArray(guids : PSafeArray); procedure MethodCStyle(var guids : ClrGuid /* from mscorlib_TLB */); If i now call the "ref" method like this it works fine: procedure CallByRef(guid : TGuid); var test : TGuid; begin test := ... comRef.MethodRef(guid); end; Now I also need the array method procedure CallArray(); var localGuid : TGuid; arrayVariant : OleVariant; begin arrayVariant := VarArrayCreate([0,4], varVariant /* dont know here */); arrayVariant[0] := localGuid; /* compile error, cannot cast implicitly */ comRef.MethodArray(PSafeArray(TVarData(arrayVariant.VArray)), /* here this object... PSafeArray works actually*/); end; Now lastly i tried with a c array procedure CallCStyle(); var localGuid : TGuid; arrayOfGuid : array [0..4] of ClrGuid; begin arrayOfGuid[0] := ClrGuid(localGuid); comRef.MethodCStyle(PSafeArray(/* now i dont know put it*/, /* here this object... PSafeArray works actually*/); end; I seriously dont know how to make this work. I hope someone has more experience with COM marshalling thx Side node: I found VT_CLSID which i think can be passed for SafeArrayCreate, but I am not sure how to sue that

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  • Functional way to get a matrix from text

    - by Elazar Leibovich
    I'm trying to solve some Google Code Jam problems, where an input matrix is typically given in this form: 2 3 #matrix dimensions 1 2 3 4 5 6 7 8 9 # all 3 elements in the first row 2 3 4 5 6 7 8 9 0 # each element is composed of three integers where each element of the matrix is composed of, say, three integers. So this example should be converted to #!scala Array( Array(A(1,2,3),A(4,5,6),A(7,8,9), Array(A(2,3,4),A(5,6,7),A(8,9,0), ) An imperative solution would be of the form #!python input = """2 3 1 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 9 0 """ lines = input.split('\n') print lines[0] m,n = (int(x) for x in lines[0].split()) array = [] row = [] A = [] for line in lines[1:]: for elt in line.split(): A.append(elt) if len(A)== 3: row.append(A) A = [] array.append(row) row = [] from pprint import pprint pprint(array) A functional solution I've thought of is #!scala def splitList[A](l:List[A],i:Int):List[List[A]] = { if (l.isEmpty) return List[List[A]]() val (head,tail) = l.splitAt(i) return head :: splitList(tail,i) } def readMatrix(src:Iterator[String]):Array[Array[TrafficLight]] = { val Array(x,y) = src.next.split(" +").map(_.trim.toInt) val mat = src.take(x).toList.map(_.split(" "). map(_.trim.toInt)). map(a => splitList(a.toList,3). map(b => TrafficLight(b(0),b(1),b(2)) ).toArray ).toArray return mat } But I really feel it's the wrong way to go because: I'm using the functional List structure for each line, and then convert it to an array. The whole code seems much less efficeint I find it longer less elegant and much less readable than the python solution. It is harder to which of the map functions operates on what, as they all use the same semantics. What is the right functional way to do that?

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