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• How to find the longest continuous subsequence whose reverse is also a subsequence

  - by iecut

  Suppose I have a sequence x1,x2,x3.....xn, and I want to find the longest continuous subsequence xi,xi+1,xi+2......xi+k, whose reverse is also a subsequence of the given sequence. And if there are multiple such subsequences, then I also have to find the first. ex:- consider the sequences: abcdefgedcg here i=3 and k=2 aabcdddd here i=5, k=3 I tried looking at the original longest common subsequence problem, but that is used to compare the two sequences to find the longest common subsequence.... but here is only one sequence from which we have to find the subsequences. Please let me know what is the best way to approach this problem, to find the optimal solution.

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• question about polynomial multiplication

  - by davit-datuashvili

  i know that horners method for polynomial pultiplication is faster but here i dont know what is happening here is code public class horner{ public static final int n=10; public static final int x=7; public static void main(String[] args){ //non fast version int a[]=new int[]{1,2,3,4,5,6,7,8,9,10}; int xi=1; int y=a[0]; for (int i=1;i<n;i++){ xi=x*xi; y=y+a[i]*xi; } System.out.println(y); //fast method int y1=a[n-1]; for (int i=n-2;i>=0;i--){ y1=x*y+a[i]; } System.out.println(y1); } } result of this two methods are not same result of first method is 462945547 and result of second method is -1054348465 please help

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• when will use new ?

  - by kam

  Hi All, class A { }; void main() { A objA; // case 1 // or A *p = new A; case 2; } when will use case 1? and when will use case2 Thanks, Kam

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• Difference between struct and class?

  - by kam

  Hi, Struct has default access specifier is public where as class has default access specifier is private. So why can't use struct if change default access specifier as private? why class? Thanks, kam

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• Why is my keyboard messed up in Eclipse?

  - by Xi

  Hi there: I am trying to type in a pair of angle brackets in Eclipse, like "<". However it shows up as a single quotation and a dot, like "'.". I tried a couple of times and found out that the angle bracket is actually located at back-slash's position. Why is this happening? How can I change it back? Thanks in advance. Xi

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• IPhone sdk stop the accelerometer from working when something happens.

  - by Harry

  Hi, I am using the accelerometer to move a few UIImageViews around the screen, at the moment the accelerometer only works when a NSTimer is at 0, this is fine. I would also like to make the accelerometer stop again when a different function happens. here is my code at the moment: -(BOOL) accelerometerWorks { return time == 0; } -(void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{ if(![self accelerometerWorks]) return; valueX = acceleration.x*25.5; int newX = (int)(ball.center.x +valueX); if (newX 320-BALL_RADIUS) newX = 320-BALL_RADIUS; if (newX < 0+BALL_RADIUS) newX = 0+BALL_RADIUS; int XA = (int)(balloonbit1.center.x +valueX); if (XA 320-BALL_RADIUS) XA = 320-BALL_RADIUS; if (XA < 0+BALL_RADIUS) XA = 0+BALL_RADIUS; int XB = (int)(balloonbit2.center.x +valueX); if (XB 320-BALL_RADIUS) XB = 320-BALL_RADIUS; if (XB < 0+BALL_RADIUS) XB = 0+BALL_RADIUS; int XI = (int)(balloonbit3.center.x +valueX); if (XI 320-BALL_RADIUS) XI = 320-BALL_RADIUS; if (XI < 0+BALL_RADIUS) XI = 0+BALL_RADIUS; int XJ = (int)(balloonbit4.center.x +valueX); if (XJ 320-BALL_RADIUS) XJ = 320-BALL_RADIUS; if (XJ < 0+BALL_RADIUS) XJ = 0+BALL_RADIUS; int XE = (int)(balloonbit5.center.x +valueX); if (XE 320-BALL_RADIUS) XE = 320-BALL_RADIUS; if (XE < 0+BALL_RADIUS) XE = 0+BALL_RADIUS; int XF = (int)(balloonbit6.center.x +valueX); if (XF 320-BALL_RADIUS) XF = 320-BALL_RADIUS; if (XF < 0+BALL_RADIUS) XF = 0+BALL_RADIUS; int XH = (int)(balloonbit8.center.x +valueX); if (XH 320-BALL_RADIUS) XH = 320-BALL_RADIUS; if (XH < 0+BALL_RADIUS) XH = 0+BALL_RADIUS; ball.center = CGPointMake (newX, 429); balloonbit1.center = CGPointMake (XA, 429); balloonbit2.center = CGPointMake (XB, 426); balloonbit3.center = CGPointMake (XI, 410); balloonbit4.center = CGPointMake (XJ, 415); balloonbit5.center = CGPointMake (XE, 409); balloonbit6.center = CGPointMake (XF, 427); balloonbit8.center = CGPointMake (XH, 417); } This all works fine, i would now like to stop the accelerometer from working, using the same accelerometerWorks method or a new method, accelerometerWontWork. This is the code that when it is called i would like the accelerometer to stop. (it is very long so i wont put all of it there, but its all the same throughout): -(void) checkCollision{ if (CGRectIntersectsRect(pinend.frame, balloonbit1.frame)){ if (balloonbit1.frame.origin.y pinend.frame.origin.y){ [maintimer invalidate]; levelfailed.center = CGPointMake (160, 235); } } if (CGRectIntersectsRect(pinend.frame, balloonbit2.frame)){ if (balloonbit2.frame.origin.y pinend.frame.origin.y){ [maintimer invalidate]; levelfailed.center = CGPointMake (160, 235); } } if (CGRectIntersectsRect(pinend.frame, balloonbit3.frame)){ if (balloonbit3.frame.origin.y pinend.frame.origin.y){ [maintimer invalidate]; levelfailed.center = CGPointMake (160, 235); } } } I understand that i may have to turn this into a BOOL. Thats fine. If i haven't explained it well please say and i will re write it. Thanks! Harry.

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• PL2303X driver for ubuntu

  - by kam

  I have 2 questions I hope someone is able to help me. I bought a usb/serial adapter based on PL2303X and not PL2303. 1- Do you know of any patches to make the PL2303X detectable and functional? 2- Assuming I got the patch, and before I apply it, I wanted to upgrade my kernel. I found this website http://www.unixmen.com/upgrade-your-kernel-the-safe-way-in-ubuntu-linuxmint/ to teach me to do so.. Is this a good procedure? and to what version you advise me to upgrade? Thanks.

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• How can I only have a single move command in a batch file?

  - by PeanutsMonkey

  I have an existing batch file that attempts to move files from 2 directories to 2 different locations. At the moment these are called as 2 separate move commands. I am wanting to simply the code further and was wondering if there was a way to do so @echo off for %%a in (C:\Test\*.*) do if "%%~xa" == "" move /Y "C:\Test\%%~na%%~xa" "D:\Done" for %%i in (C:\Sample\*.*) do if "%%~xi" == "" move /Y "C:\Sample\%%~ni%%~xi" "D:\Done"

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• SciPy interp1d results are different than MatLab interp1

  - by LMO

  I'm converting a MatLab program to Python, and I'm having problems understanding why scipy.interpolate.interp1d is giving different results than MatLab interp1. In MatLab the usage is slightly different: yi = interp1(x,Y,xi,'cubic') SciPy: f = interp1d(x,Y,kind='cubic') yi = f(xi) For a trivial example the results are the same: MatLab: interp1([0 1 2 3 4], [0 1 2 3 4],[1.5 2.5 3.5],'cubic') 1.5000 2.5000 3.5000 Python: interp1d([1,2,3,4],[1,2,3,4],kind='cubic')([1.5,2.5,3.5]) array([ 1.5, 2.5, 3.5]) But for a real-world example they are not the same: x = 0.0000e+000 2.1333e+001 3.2000e+001 1.6000e+004 2.1333e+004 2.3994e+004 Y = -6 -6 20 20 -6 -6 xi = 0.00000 11.72161 23.44322 35.16484... (2048 data points) Matlab: -6.0000e+000 -1.2330e+001 -3.7384e+000 ... 7.0235e+000 7.0028e+000 6.9821e+000 SciPy: array([[ -6.00000000e+00], [ -1.56304101e+01], [ -2.04908267e+00], ..., [ 1.64475576e+05], [ 8.28360759e+04], [ -5.99999999e+00]]) Any thoughts as to how to can get results that are consistent with MatLab?

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• C# WCF client configuration for X509 secured web service over https

  - by Kam

  Hi guys I been pulling my hair out for the past few days trying to connect to a web service using .Net 3.5 and WCF (have also tried using WSE 3.0) without much luck. The web service is hosted by a 3rd party and we can access via https. They also make use of X509 certificates for security, to sign the message. I've been given some basic info and am able to connect and test the service using SOAP UI 3.5 without any problems, so we know that this is not the issue. Just trying to get it done in code! I've added the X509 certificate into the certificate store using the mmc snap-in, and using tracing and logging i can see that the message is being signed, just unable to see which part i have got wrong. Any healp GREATLY appreciated :) I've been given an offline WSDL file, which I have imported in as a service reference is VS 2008. My calling code looks like so, simple enough: ServicePointManager.ServerCertificateValidationCallback = delegate(object sender,X509Certificate certificate,X509Chain chain, SslPolicyErrors sslErrors) { return true; }; GatewayClient gateway = new GatewayClient(); CheckStatusResponse response = gateway.CheckLineStatus(); And my config looks like so: <basicHttpBinding> <binding name="Gateway_1.0" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <security mode="TransportWithMessageCredential"> <transport clientCredentialType="None" proxyCredentialType="None" realm="" /> <message clientCredentialType="Certificate" algorithmSuite="Default" /> </security> </binding> </basicHttpBinding> <customBinding> <binding name="Gateway_1"> <security authenticationMode="CertificateOverTransport" includeTimestamp="true" messageProtectionOrder="SignBeforeEncrypt"> <localClientSettings maxClockSkew="12:00:00" replayWindow="12:00:00" sessionKeyRolloverInterval="12:00:00" timestampValidityDuration="12:00:00" /> <localServiceSettings maxClockSkew="12:00:00" sessionKeyRolloverInterval="12:00:00" timestampValidityDuration="12:00:00" /> <secureConversationBootstrap /> </security> <textMessageEncoding messageVersion="Soap11" /> <sslStreamSecurity requireClientCertificate="true" /> <httpsTransport hostNameComparisonMode="WeakWildcard" /> </binding> </customBinding> <wsHttpBinding> <binding name="Gateway_1" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <security mode="TransportWithMessageCredential"> <message clientCredentialType="Certificate" negotiateServiceCredential="false" establishSecurityContext="true" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="https://XXX.XX.XXX.XX/SOAP" behaviorConfiguration="ClientCertificateBehavior" binding="wsHttpBinding" bindingConfiguration="Gateway_1" contract="B2BService.Gateway" name="Gateway_1_HTTPSPort"> <identity> <dns value="ext.test.com" /> </identity> </endpoint> </client> <behaviors> <endpointBehaviors> <behavior name="ClientCertificateBehavior"> <clientCredentials> <clientCertificate findValue="mycertificate.com" storeLocation="CurrentUser" storeName="Root" x509FindType="FindBySubjectName" /> <serviceCertificate> <authentication certificateValidationMode="PeerOrChainTrust" /> </serviceCertificate> </clientCredentials> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> Regardless of which config I use, the code fails for one reason or another, causing internal server errors, Error processing message for security, Undefined 'badEncoding' resource property, or expected http URI given https, and a few other! Been going round and round a bit, and I am sure it is very simple once the cofig is set :( I'm sure I've missed loads out, let me know if seeing the SOAP UI generated envelope and the currect WCF generated envelope will help. many thanks. Kam

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• Find the element with the most "neighbors" in a sequence

  - by Bao An

  Assume that we have a sequence S with n elements <x1,x2,...,xn>. A pair of elements xi,xj are considered neighbors if |xi-xj|<d, with d a given distance between two neighbors. So how can find out the element that has most neighbors in the sequence? (A simply way is sorting the sequence and then calculating number of each element but it's time complexity is quite large): O(nlogn) May you please help me find a better way to reduce time complexity?

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• Trying to run an ASP.NET MVC application using Mono on Apache with FastCGI.

  - by Arda Xi

  I have a hosting account with DreamHost, and I would like to use the same account to run ASP.NET applications. I have an application deployed in a subdomain, a .htaccess with a handler like this: # Define the FastCGI Mono launcher as an Apache handler and let # it manage this web-application (its files and subdirectories) SetHandler monoWrapper Action monoWrapper /home/arienh4/<domain>/cgi-bin/mono.fcgi virtual My mono.fcgi is set up as such: #!/bin/sh #umask 0077 exec >>/home/arienh4/tmp/mono-fcgi.log exec 2>>/home/arienh4/tmp/mono-fcgi.err echo $(date +"[%F %T]") Starting fastcgi-mono-server2 cd / chmod 0700 /home/arienh4/tmp/mono-fcgi.sock echo $$>/home/arienh4/tmp/mono-fcgi.pid # stdin is the socket handle export PATH="/home/arienh4/mono/bin:$PATH" export LD_LIBRARY_PATH="/home/arienh4/mono/lib:$LD_LIBRARY_PATH" export TMP="/home/arienh4/tmp" export MONO_SHARED_DIR="/home/arienh4/tmp" exec /home/arienh4/mono/bin/mono /home/arienh4/mono/lib/mono/2.0/fastcgi-mono-server2.exe \ /logfile=/home/arienh4/logs/fastcgi-mono-web.log /loglevels=All \ /applications=/:/home/arienh4/<domain> I took this from the Mono site for CGI, I'm not sure if I'm doing it correctly though. This code is resulting in this error: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace. I have no idea what's causing this. As far as I can see, Mono isn't even hit (no log files are created).

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• Trying to run an ASP.NET MVC application using Mono on Apache with FastCGI

  - by Arda Xi

  I have a hosting account with DreamHost and I would like to use the same account to run ASP.NET applications. I have an application deployed in a subdomain, a .htaccess with a handler like this: # Define the FastCGI Mono launcher as an Apache handler and let # it manage this web-application (its files and subdirectories) SetHandler monoWrapper Action monoWrapper /home/arienh4/<domain>/cgi-bin/mono.fcgi virtual My mono.fcgi is set up as such: #!/bin/sh #umask 0077 exec >>/home/arienh4/tmp/mono-fcgi.log exec 2>>/home/arienh4/tmp/mono-fcgi.err echo $(date +"[%F %T]") Starting fastcgi-mono-server2 cd / chmod 0700 /home/arienh4/tmp/mono-fcgi.sock echo $$>/home/arienh4/tmp/mono-fcgi.pid # stdin is the socket handle export PATH="/home/arienh4/mono/bin:$PATH" export LD_LIBRARY_PATH="/home/arienh4/mono/lib:$LD_LIBRARY_PATH" export TMP="/home/arienh4/tmp" export MONO_SHARED_DIR="/home/arienh4/tmp" exec /home/arienh4/mono/bin/mono /home/arienh4/mono/lib/mono/2.0/fastcgi-mono-server2.exe \ /logfile=/home/arienh4/logs/fastcgi-mono-web.log /loglevels=All \ /applications=/:/home/arienh4/<domain> I took this from the Mono site for CGI. I'm not sure if I'm doing it correctly though. This code is resulting in this error: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace. I have no idea what's causing this. As far as I can see, Mono isn't even hit (no log files are created).

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• How to fix GRUB after Windows breaks it, and how to edit the GRUB menu

  - by Rob Kam

  I had Windows XP and Ubuntu both installed. I could easily boot into either until Windows "fixed" the bootloader so that it now only boots into Windows. I guess there is no way to prevent Windows from doing this. So instead when it happens how do I quickly restore the GRUB bootloader? Also while I'm here: How do I edit the GRUB menu, to hide options I don't want and to change the default boot OS?

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• Is there a user-comfortable Unix-like OS?

  - by Rob Kam

  Apparently BSD is like this but only for the OS not for the third party applications: Is there a Unix or Unix-like operating system (but not OS X), where all the installed applications and drivers either all work smoothly/properly or are not included in the distribution? But not something that's been dumbed down.

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• With modern PC systems, what less-than-optimal designs have we inherited?

  - by Rob Kam

  What have been less than optimal design choices, that are now (almost) immutable features of the modern PC system, and what constraints led to these choices? There have been a great many of these. For example the qwerty keyboard is widespread although the Dvorak keyboard might be a better choice. I guess this is something to do with the teletypes that were used as early computer keyboards, which had originally been modified from typewriters.

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• Cloning a USB flash drive to another larger one, is it safe to do so?

  - by Rob Kam

  I used Acronis True Image Home 2010 to clone a Dane-Elec zLight 8Gb pen drive/USB flash drive to a PNY Attaché 16Gb USB flash drive. Now WinXP shows the drive in device manager as USB DISK 2.0 USB DEVICE but doesn't have it in My Computer/doesn't assign it a drive letter. What is it that has messed up the PNY Attaché and is there some way to repair it so that it can be used as a regular USB flash drive again? Is there a safe way to clone a USB flash drive to another larger one? How safe is it to backup and restore a USB flash drive to/from a drive-image?

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• How to get the Classic Start Menu in Windows 7?

  - by Rob Kam

  Classic start menu is simple and efficient, but the Vista style start menu gets in the way from letting me get on with what I want to do. It also has features I don't want, such as an irritating bitmap that changes according to where the cursor hovers. I've managed to disable most of the unwanted cosmetics and animations but it's still not the dull old Classic Menu that I prefer. How to get the Classic Start Menu in Windows 7 but without a kludge if possible?

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• Volume randomly turning itself down on Windows 7 64-bit

  - by Arda Xi

  This is the weirdest issue I've ever encountered with my PC. Every so often, my sound will start playing back at a lower volume. This happens when watching video, listening to music, all independently. It usually lasts anywhere up to a minute, after which it will turn up again. The weird thing about it is that the volume control in Windows remains at 100%, even though the volume is audibly a lot lower. (No, I'm not going deaf, it's just my PC. I checked.) I just have no idea where to go to troubleshoot this, even. I'm using Windows 7 64-bit with an on-board Realtek sound-card. Oh, just in case someone finds this question on Google or whatever, making sure this is on Do Nothing may fix your problem. Unfortunately, it did not work for me. My settings all seem fine. This is my audio slider. (Took the screenshot while the issue showed.)

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• iptables port redirection on Ubuntu

  - by Xi.

  I have an apache server running on 8100. When open http://localhost:8100 in browser we will see the site running correctly. Now I would like to direct all request on 80 to 8100 so that the site can be accessed without the port number. I am not familiar with iptables so I searched for solutions online. This is one of the methods that I have tried: user@ubuntu:~$ sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT user@ubuntu:~$ sudo iptables -A INPUT -p tcp --dport 8100 -j ACCEPT user@ubuntu:~$ sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-ports 8100 It's not working. The site works on 8100 but it's not on 80. If print out the rules using "iptables -t nat -L -n -v", this is what I see: user@ubuntu:~$ sudo iptables -t nat -L -n -v Chain PREROUTING (policy ACCEPT 14 packets, 2142 bytes) pkts bytes target prot opt in out source destination 0 0 REDIRECT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 redir ports 8100 Chain INPUT (policy ACCEPT 14 packets, 2142 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 177 packets, 13171 bytes) pkts bytes target prot opt in out source destination Chain POSTROUTING (policy ACCEPT 177 packets, 13171 bytes) pkts bytes target prot opt in out source destination The OS is a Ubuntu on a VMware. I thought this should be a simple task but I have been working on it for hours without success. :( What am I missing?

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• Computing "average" of two colors

  - by Francisco P.

  This is only marginally programming related - has much more to do w/ colors and their representation. I am working on a very low level app. I have an array of bytes in memory. Those are characters. They were rendered with anti-aliasing: they have values from 0 to 255, 0 being fully transparent and 255 totally opaque (alpha, if you wish). I am having trouble conceiving an algorithm for the rendering of this font. I'm doing the following for each pixel: // intensity is the weight I talked about: 0 to 255 intensity = glyphs[text[i]][x + GLYPH_WIDTH*y]; if (intensity == 255) continue; // Don't draw it, fully transparent else if (intensity == 0) setPixel(x + xi, y + yi, color, base); // Fully opaque, can draw original color else { // Here's the tricky part // Get the pixel in the destination for averaging purposes pixel = getPixel(x + xi, y + yi, base); // transfer is an int for calculations transfer = (int) ((float)((float) (255.0 - (float) intensity/255.0) * (float) color.red + (float) pixel.red)/2); // This is my attempt at averaging newPixel.red = (Byte) transfer; transfer = (int) ((float)((float) (255.0 - (float) intensity/255.0) * (float) color.green + (float) pixel.green)/2); newPixel.green = (Byte) transfer; // transfer = (int) ((float) ((float) 255.0 - (float) intensity)/255.0 * (((float) color.blue) + (float) pixel.blue)/2); transfer = (int) ((float)((float) (255.0 - (float) intensity/255.0) * (float) color.blue + (float) pixel.blue)/2); newPixel.blue = (Byte) transfer; // Set the newpixel in the desired mem. position setPixel(x+xi, y+yi, newPixel, base); } The results, as you can see, are less than desirable. That is a very zoomed in image, at 1:1 scale it looks like the text has a green "aura". Any idea for how to properly compute this would be greatly appreciated. Thanks for your time!

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• Some optimization about the code (computing ranks of a vector)?

  - by user1748356

  The following code is a function (performance-critical) to compute tied ranks of a vector: mergeSort(x,inds,ci); //a sort function to sort vector x of length ci, also returns keys (inds) of x. int tj=0; double xi=x[0]; for (int j = 1; j < ci; ++j) { if (x[j] > xi) { double rankvalue = 0.5 * (j - 1 + tj); for (int k = tj; k < j; ++k) { ranks[inds[k]]=rankvalue; }; tj = j; xi = x[j]; }; }; double rankvalue = 0.5 * (ci - 1 + tj); for (int k = tj; k < ci; ++k) { ranks[inds[k]]=rankvalue; }; The problem is, the supposed performance bottleneck mergeSort(), which is O(NlogN) is several times faster than the other part of codes (which is O(N)), which suggests there is room for huge improvment with the other part of the codes, any advices?

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• PHP: upload files to network shared folder

  - by Xi

  Hi there: I have a problem uploading file to a network shared folder. I can connect to the folder by using windows authentication in IE. The script is as followed: $target_path = '\\\\server\\images\\'; $target_path = $target_path . basename( $_FILES['uploadedfile']['name']); if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) { echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded"; } else{ echo "There was an error uploading the file, please try again!"; } when i ran it , I got an error message read: Warning: move_uploaded_file(\server\images\pic_firefox.jpg) [function.move-uploaded-file]: failed to open stream: Permission denied in C:\xxxxxxxxx\uploader.php on line 6 I thought that's because windows authentication doesn't work this way. Is there a way I can upload the file by using username/password? Any thoughts would be appreciated.

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• Good way to get the key of the highest value of a Dictionary in C#

  - by Arda Xi

  I'm trying to get the key of the maximum value in the Dictionary<double, string> results. This is what I have so far: double max = results.Max(kvp => kvp.Value); return results.Where(kvp => kvp.Value == max).Select(kvp => kvp.Key).First(); However, since this seems a little inefficient, I was wondering whether there was a better way to do this.

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• Hibernate : Opinions in Composite PK vs Surrogate PK

  - by Albert Kam

  As i understand it, whenever i use @Id and @GeneratedValue on a Long field inside JPA/Hibernate entity, i'm actually using a surrogate key, and i think this is a very nice way to define a primary key considering my not-so-good experiences in using composite primary keys, where : there are more than 1 business-value-columns combination that become a unique PK the composite pk values get duplicated across the table details cannot change the business value inside that composite PK I know hibernate can support both types of PK, but im left wondering by my previous chats with experienced colleagues where they said that composite PK is easier to deal with when doing complex SQL queries and stored procedure processes. They went on saying that when using surrogate keys will complicate things when doing joining and there are several condition when it's impossible to do some stuffs when using surrogate keys. Although im sorry i cant explain the detail here since i was not clear enough when they explain it. Maybe i'll put more details next time. Im currently trying to do a project, and want to try out surrogate keys, since it's not getting duplicated across tables, and we can change the business-column values. And when the need for some business value combination uniqueness, i can use something like : @Table(name="MY_TABLE", uniqueConstraints={ @UniqueConstraint(columnNames={"FIRST_NAME", "LAST_NAME"}) // name + lastName combination must be unique But im still in doubt because of the previous discussion about the composite key. Could you share your experiences in this matter ? Thank you !

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