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  • The Community-Driven GDB Primer

    - by fbrereto
    I was reading this question and realized it might be helpful for entry- and pro-level developers alike (including myself) to have a common reference for best practices in using gdb. Many questions asked on Stack Overflow could easily be solved by taking some time to step some code in a debugger, and it would be good to have a community-approved resource to "teach them how to fish", so to speak. Even for those seasoned veterans who occasionally find themselves in gdb when they are accustomed to a GUI-tastic debugger might benefit from those who are much more familiar with the command line tool. For starters (both to gdb and to prime this thread) I submit: Ninefinger's gdb primer The gdb quick reference guide, which is useful for telling you what commands are available but not how best to use them. My hope is this thread is a seed planted that is of continued value to the community. If by "continued value" the community decides to nix it altogether, well then the masses have spoken.

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  • Using FourSquare API in a Rails App

    - by MikeH
    Anybody have any good resources that might be helpful in trying to integrate the FourSquare API into a Rails app? I'm specifically looking for a good tutorial. There doesn't seem to be much out there yet. There are a few ruby gems, but they are pretty bare bones and I need a bit more hand-holding. Here is a resource that I've found so far: http://tedgrubb.com/ Stack Overflow won't let me include a second hyperlink, but you can also google: Foursquare ruby gem for another resource. I have not done much work with APIs in the past, but I am very comfortable with Rails. What I need is a little better sense of exactly where all the pieces fit. A basic tutorial is what I'm looking for. Thanks.

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  • Guessing the time zone from an arbitrary "location" string?

    - by Thomas
    I'm trying to run some statistics over the Stack Overflow data dump, and for that I would like to know the time zone for each user. However, all I have to go on is the completely free-form "location" string. I'll stress that I'm only looking for an approximation of the time zone; of course, in general this is an unsolvable problem. However, many people fill out their country, state and/or city, which should give a pretty good indication. It's okay if it fails for other cases. It doesn't have to be reliable, it doesn't have to be accurate, it doesn't have to cover all bases. I don't want to waste too much time on this, so I'm wondering if there is some code out there that can make a reasonable guess. Any language, platform, API or library goes. Any ideas?

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  • Facebook Like Box

    - by abelenky
    I'm trying to add a Facebook "Like Box" to an existing website, as described here The Page I'm promoting works just fine in preview-box on that page. But when I copy/paste the code as shown to my website, it instead shows a fraction of an empty facebook page with only a partially visible error message. <iframe src="http://www.facebook.com/plugins/likebox.php?profile_id=SenRandyGordon&amp;width=260&amp;connections=10&amp;stream=true&amp;header=true" scrolling="no" frameborder="0" allowTransparency="true" style="border:none; overflow:hidden; width:260px; height:px"></iframe> I cannot figure out what I'm doing wrong, and I added "Like Box"'s in the past, before Facebook released their new API. Please help?

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  • How can I stop my "headerSticky" and "content" divs from overlapping?

    - by danielle
    I'm making a page that has three main components: a "headerSticky" header div, "sidenav" left navigation div, and "content" div. The side navigation is fixed and does not move; but the content div should be scrollable on its own. However, the top of the content div is always overlapped by the header div. Here is the CSS for the header: #headerSticky{ float:top; position:fixed; padding:6px; width: 100%;} and the content div: #content { padding-top: 100px; float:right; overflow: auto; height: 90%; width: 840px; padding: 0 20px 20px;} Any help would be appreciated. Thank you!

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  • Most used .NET namespace

    - by Michael Prewecki
    What is your most commonly used namespace in .NET. I know it will vary greatly based upon the types of projects you develop but the stack overflow audience should provide a fairly decent sample set for the types of .NET projects being developed. I'm simply interest in the name of the namespace (one namespace per answer and no one person should have more than one answer, if someone else has the same answer as you then just upvote their answer). Try to be as specific as possible (so answering System, isn't helpful). I'm after this information to help new developers focus their attention on the most common .NET namespaces...there are after all thousands of them! To start off mine is almost certainly System.Collections.Generic, I use lists of things everywhere.

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  • Enunciate http error 404

    - by malakan
    Hi, I tried to setup a simple project with spring and enunciate+jax-ws/jax-rs annotation, but I didn't get it work. I used some great tutorial for the enunciate integration tutorial as template: http://docs.codehaus.org/display/ENUNCIATE/A+Rich+Web+service+API+for+your+favorite+framework Enunciate create the api-page like in the tutorial, but I get this error : If I open a mount point, for example the REST one (/rest/Service/getService/1), I'll get a 404-Error: NOT_FOUND Here is sample of my code : pom.xml: <plugin> <groupId>org.codehaus.enunciate</groupId> <artifactId>maven-enunciate-spring-plugin</artifactId> <version>1.19</version> <configuration> <configFile>src/main/webapp/WEB-INF/enunciate.xml</configFile> </configuration> <executions> <execution> <goals> <goal>assemble</goal> </goals> </execution> </executions> </plugin> enunciate.xml: <api-classes> <include pattern="com.myProject.model.*"/> <include pattern="com.myProject.services.MyService"/> <include pattern="com.myProject.services.MyServiceImpl"/> </api-classes> <webapp mergeWebXML="web.xml"/> <modules> <docs docsDir="api" title="myApp API"/> <spring-app> <springImport file="spring/applicationContext-config.xml"/> </spring-app> </modules> my service : package com.myProject.services; import java.util.List; import javax.jws.WebService; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import com.myProject.model.*; @WebService public interface MyService { @GET @Path("getService/{id}") public Service getService(@PathParam(value = "id")Integer id); } MyServiceImpl: package com.myProject.services; import javax.jws.WebService; ...(all import) import javax.persistence.EntityManager; @Service @Path("/Service") @WebService (endpointInterface="com.myProjects.services.MyService") @RemotingDestination(channels={"my-amf"}) public class MyServiceImpl implements MyService { private final Log logger = LogFactory.getLog(getClass()); @Autowired private MyServiceDao myServiceDao ; /*@Inject private MyServiceDao myServiceDao ;*/ public Service getService (Integer id) { return myServiceDao.getService (id); } } and I put @XmlRootElement on the model. I have tried several configuration, I couldn't get the xml or json response...just 404. Doesn't anyone know what is wrong?

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  • Implementing fallback from Google AJAX Libraries API to local jQuery

    - by Maxim Z.
    After looking up the advantages and disadvantages of using Google's AJAX Libraries API instead of using jQuery locally, I saw that someone wrote in an answer (here on Stack Overflow, of course) that it's possible to get around the downtime that Google's API sometimes experiences by somehow falling back to a local copy of the library you use. I want to use Google's AJAX Libraries API on my site, but I'm concerned about this possible downtime and I'm curious how such a fallback procedure can be implemented. Has anybody ever tried doing this? Can you point me towards some code that accomplishes such a feat? Thanks in advance.

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  • On-the-fly lossless image compression

    - by geschema
    I have an embedded application where an image scanner sends out a stream of 16-bit pixels that are later assembled to a grayscale image. As I need to both save this data locally and forward it to a network interface, I'd like to compress the data stream to reduce the required storage space and network bandwidth. Is there a simple algorithm that I can use to losslessly compress the pixel data? I first thought of computing the difference between two consecutive pixels and then encoding this difference with a Huffman code. Unfortunately, the pixels are unsigned 16-bit quantities so the difference can be anywhere in the range -65535 .. +65535 which leads to potentially huge codeword lengths. If a few really long codewords occur in a row, I'll run into buffer overflow problems.

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  • VB.NET - Read lines from command line to Windows form possible?

    - by Yiu Korochko
    Hey Overflow, I have an application which serves as a user interface for a spartan/command line program. I have the program running on a separate process, and my application monitors it to see if it is responding and how mush CPU it is utilising. Now I have a list of files in my program (listbox) which are to be sent to the application, which happens fine. But I want to be able to read text from the com-line so as to determine when the first file has been processed. Com-line says one of "selecting settings", "unsupported format" and "cannot be fixed". What I want to be able to do is when it says one of these three things, remove item(0) in listbox1. Is this possible? I thought of programming an event which handles com_exe.print or something or other, if possible.

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  • How to get fan list of Facebook page or can overwite facebook social plugin css?

    - by Vaibhav Bhalke
    Hi, We are trying it with facebook social plugin. The HTML code for it as follow: <iframe border='0' src='http://www.facebook.com/plugins/likebox.php?id=1185611481&width=243&height=400&connections=15&stream=false&header=false' scrolling='yes' frameborder='0' allowTransparency='false' style='border:0px; overflow:hidden; width:243px; height:300px; background-color: #03869E; color: white;'> <iframe> As it replace inner HTML of frame on load. We want our own CSS to apply to this HTML. But as it replace whole HTML and it have its own CSS we are unable to set our CSS. We are doing this in GWT. Is there any way we can get the list of fans so we can display it as we want and can apply css? Or check given user is fan of page?

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  • Getting a specific number of JSON items with jQuery from tumblr feed

    - by Kevin Whitaker
    Hello all. I'm trying to populate a page with X entries from my tumblr feed, and I'm wondering how I can only pull that X number from the JSON object it returns. Here's my code, pulled from another Stack Overflow post and modified: //Tumblr retrieval $.getJSON("http://tumblr-address/api/read/json?callback=?", function(data) { $.each(data.posts, function(i,posts){ var title = this["regular-title"]; var type = this.type; var date = this.date; var url = this["url-with-slug"]; $('#sideRail ol').prepend('<li><p><a href=' +url +'>' + title + '</a></p><p>' + date + '</p></li>'); }); }); I've tried using a while loop with a counter, but it just repeats everything X times before moving on to the next item in the list. Thanks for any help.

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  • is it possible to achieve an image clipping/masking effect with html + css3?

    - by sa125
    Hi - I'm trying to place a nice border around an image that's 250x250, using only html and css. The markup is this: <div id="img-container"><img src="pic.jpg" border="0"/></div> And the css is: #img-container { height: 225px; width: 225px; padding: 3px; border: 1px solid black; z-index: 10; position: relative; overflow: hidden; border-radius: 10px; } #img-container img { z-index: 5; } Basically, I want the div container to clip the picture's edges that exceed its boundaries. This will achieve the rounded edges effect using the border-radius property (-moz-border-radius, -webkit-border-radius, etc) - if it actually works or could even be done. Looking for tips and tricks on this. Thanks. And, yes, I'm obviously not a web designer :)

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  • simple float issue on wordpress blog

    - by JCHASE11
    I am modifying a wordpress theme completely, and have run into one very simple problem. Please look at my page here: wordpress blog When you scroll down, you can see the one blank area under the first post. For some reason, that block isn't floating left. Each post has the following css that fits in a 645px container: .home-post-wrap { width: 285px; margin:0; float: left; background-color: #FFF; padding: 15px; overflow: hidden; border-bottom:1px dotted #C5C5C5; border-right:1px dotted #C5C5C5; } Any idea on how to make the page flow correctly here?

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  • How to fix slow scrolling when using webkit-transform and relative positioning on the iphone

    - by BeWarned
    I have implemented scrolling of a div by using relative positioning and webkit animation for the iphone, it works beautifully on desktop safari but is choppy on the actual iphone (fine on the simulator). The scrolling works by having a div nested and clipped (overflow:hidden) by its parent. I then set the top position and animate it with -webkit style declarations. The iphone seems to noticeably slow down when there are a lot of items in the inner div. Any ideas how make the scrolling smoother? This was a problem with iScroll code and my own hand coded stuff.

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  • MSDN "pseudoframe"

    - by bobobobo
    So, I'm trying to replicate MSDN "pseudoframes" here. Their pages are laid out like they're using an old-school frameset, but inspecting their elements with firebug reveals they've done this with purely div's. Here's my attempt at it. Its not perfect though, it only works in Chrome and Firefox, it has this weird highlight select behavior that I don't like, any takers? <!doctype html> <html> <head> <title>msdn "pseudoframe"</title> <style> body { background-color: #aaa; margin: 0; padding: 0; } div#pseudoframe, div#main { border: solid 1px black; background-color: #fff; } div#pseudoframe { position: absolute; left: 0; width: 180px; height: 100%; overflow-x: auto; overflow-y: none; } div#sizeMod { background-color: #a0a; position: absolute; left: 220px; height: 100%; cursor: e-resize; } div#main { font-weight: bold; font-size: 2em; padding: 24px; margin-left: 224px; } </style> <script type="text/javascript"> function initialize() { // get the pseudoframe and attach an event to the mouse flyover. var pf = document.getElementById('pseudoframe'); var main = document.getElementById('main'); var resize = document.getElementById( 'sizeMod' ); pf['onmouseover'] = function( event ) { event = event || window.event; var el = event.srcElement || event.target ; // are we within 5 px of the border? if we are, // change the mouse cursor to resize. }; pf['onscroll'] = function( event ) { event = event || window.event; var el = event.srcElement || event.target ; var sizeMod = document.getElementById( 'sizeMod' ); //alert( el.scrollLeft ); sizeMod.style.right = '-' + (el.scrollLeft) + 'px'; //alert( sizeMod.style.right ); // are we within 5 px of the border? if we are, // change the mouse cursor to resize. }; resize['onmousedown'] = function( event ) { event = event || window.event; var el = event.srcElement || event.target ; window.lockResize = true; }; window['onmouseup'] = function( event ) { event = event || window.event; var el = event.srcElement || event.target ; window.lockResize = false; //release on any mouse up event //alert('unlocked'); }; window['onmousemove'] = function( event ) { event = event || window.event; var el = event.srcElement || event.target ; if( window.lockResize == true ) { // resize. get client x and y. var x = event.clientX; var y = event.clientY; pf.style.width = x + 'px'; resize.style.left = x + 'px'; main.style.marginLeft = x + 'px'; //alert( pf.style.width ); event.stopPropagation(); event.preventDefault(); return false; } }; } </script> </head> <body onload=" initialize(); "> <div id="pseudoframe"> <ul> <li>Code</li> <li>MICROSOFT CODE <ul> <li>WINDOWS XP SOURCE</li> <li>WINDOWS VISTA SOURCE</li> <li>WINDOWS 7 SOURCE</li> <li>WINDOWS 8 SOURCE</li> </ul> </li> <li>DOWNLOAD ALL MICROSOFT CODE EVER WRITTEN</li> <li>DOWNLOAD ALL MAC OS CODE EVER WRITTEN</li> <li>DOWNLOAD ALL AMIGA GAME CONSOLE CODE</li> <li>DOWNLOAD ALL CODE EVER WRITTEN PERIOD</li> </ul> </div> <div id="sizeMod">&nbsp;&nbsp;</div> <div id="main"> lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe lorem ipsum microsoft pseudoframe </div> </body> </html>

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  • How can I access the bookmarks toolbar using only shortcuts in Firefox 3

    - by driekken
    I am not interested in accessing the bookmarks menu or sidebar. The specific goal that I'm trying to accomplish is to be able to easily navigate (using only the keyboard) through the live bookmarks loaded from stack overflow by means of a feed reader and located on my bookmarks toolbar. Notes: I have found an add-on that supposedly does exactly what I need: Bookmark Keys, but unfortunately it doesn't work in firefox 3), and is not being currently maintained. I'm using WinXP at work and Ubuntu 8.04 at home. Edit: changed bookmark keys "not compatible" with firefox 3 to "not working" in firefox 3

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  • Piping SoX in Python - subprocess alternative?

    - by Cochise Ruhulessin
    I use SoX in an application. The application uses it to apply various operations on audiofiles, such as trimming. This works fine: from subprocess import Popen, PIPE kwargs = {'stdin': PIPE, 'stdout': PIPE, 'stderr': PIPE} pipe = Popen(['sox','-t','mp3','-', 'test.mp3','trim','0','15'], **kwargs) output, errors = pipe.communicate(input=open('test.mp3','rb').read()) if errors: raise RuntimeError(errors) This will cause problems on large files hower, since read() loads the complete file to memory; which is slow and may cause the pipes' buffer to overflow. A workaround exists: from subprocess import Popen, PIPE import tempfile import uuid import shutil import os kwargs = {'stdin': PIPE, 'stdout': PIPE, 'stderr': PIPE} tmp = os.path.join(tempfile.gettempdir(), uuid.uuid1().hex + '.mp3') pipe = Popen(['sox','test.mp3', tmp,'trim','0','15'], **kwargs) output, errors = pipe.communicate() if errors: raise RuntimeError(errors) shutil.copy2(tmp, 'test.mp3') os.remove(tmp) So the question stands as follows: Are there any alternatives to this approach, aside from writing a Python extension to the Sox C API?

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  • Why doesn't my implementation of ElGamal work for long text strings?

    - by angstrom91
    I'm playing with the El Gamal cryptosystem, and my goal is to be able to encipher and decipher long sequences of text. I have come up with a method that works for short sequences, but does not work for long sequences, and I cannot figure out why. El Gamal requires the plaintext to be an integer. I have turned my string into a byte[] using the .getBytes() method for Strings, and then created a BigInteger out of the byte[]. After encryption/decryption, I turn the BigInteger into a byte[] using the .toByteArray() method for BigIntegers, and then create a new String object from the byte[]. This works perfectly when i call ElGamalEncipher with strings up to 129 characters. With 130 or more characters, the output produced from ElGamalDecipher is garbled. Can someone suggest how to solve this issue? Is this an issue with my method of turning the string into a BigInteger? If so, is there a better way to turn my string of text into a BigInteger and back? Below is my encipher/decipher code with a program to demonstrate the problem. import java.math.BigInteger; public class Main { static BigInteger P = new BigInteger("15893293927989454301918026303382412" + "2586402937727056707057089173871237566896685250125642378268385842" + "6917261652781627945428519810052550093673226849059197769795219973" + "9423619267147615314847625134014485225178547696778149706043781174" + "2873134844164791938367765407368476144402513720666965545242487520" + "288928241768306844169"); static BigInteger G = new BigInteger("33234037774370419907086775226926852" + "1714093595439329931523707339920987838600777935381196897157489391" + "8360683761941170467795379762509619438720072694104701372808513985" + "2267495266642743136795903226571831274837537691982486936010899433" + "1742996138863988537349011363534657200181054004755211807985189183" + "22832092343085067869"); static BigInteger R = new BigInteger("72294619754760174015019300613282868" + "7219874058383991405961870844510501809885568825032608592198728334" + "7842806755320938980653857292210955880919036195738252708294945320" + "3969657021169134916999794791553544054426668823852291733234236693" + "4178738081619274342922698767296233937873073756955509269717272907" + "8566607940937442517"); static BigInteger A = new BigInteger("32189274574111378750865973746687106" + "3695160924347574569923113893643975328118502246784387874381928804" + "6865920942258286938666201264395694101012858796521485171319748255" + "4630425677084511454641229993833255506759834486100188932905136959" + "7287419551379203001848457730376230681693887924162381650252270090" + "28296990388507680954"); public static void main(String[] args) { FewChars(); System.out.println(); ManyChars(); } public static void FewChars() { //ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) BigInteger[] cipherText = ElGamal.ElGamalEncipher("This is a string " + "of 129 characters which works just fine . This is a string " + "of 129 characters which works just fine . This is a s", P, G, R); System.out.println("This is a string of 129 characters which works " + "just fine . This is a string of 129 characters which works " + "just fine . This is a s"); //ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) System.out.println("The decrypted text is: " + ElGamal.ElGamalDecipher(cipherText[0], cipherText[1], A, P)); } public static void ManyChars() { //ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) BigInteger[] cipherText = ElGamal.ElGamalEncipher("This is a string " + "of 130 characters which doesn’t work! This is a string of " + "130 characters which doesn’t work! This is a string of ", P, G, R); System.out.println("This is a string of 130 characters which doesn’t " + "work! This is a string of 130 characters which doesn’t work!" + " This is a string of "); //ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) System.out.println("The decrypted text is: " + ElGamal.ElGamalDecipher(cipherText[0], cipherText[1], A, P)); } } import java.math.BigInteger; import java.security.SecureRandom; public class ElGamal { public static BigInteger[] ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) { // returns a BigInteger[] cipherText // cipherText[0] is c // cipherText[1] is d SecureRandom sr = new SecureRandom(); BigInteger[] cipherText = new BigInteger[2]; BigInteger pText = new BigInteger(plaintext.getBytes()); // 1: select a random integer k such that 1 <= k <= p-2 BigInteger k = new BigInteger(p.bitLength() - 2, sr); // 2: Compute c = g^k(mod p) BigInteger c = g.modPow(k, p); // 3: Compute d= P*r^k = P(g^a)^k(mod p) BigInteger d = pText.multiply(r.modPow(k, p)).mod(p); // C =(c,d) is the ciphertext cipherText[0] = c; cipherText[1] = d; return cipherText; } public static String ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) { //returns the plaintext enciphered as (c,d) // 1: use the private key a to compute the least non-negative residue // of an inverse of (c^a)' (mod p) BigInteger z = c.modPow(a, p).modInverse(p); BigInteger P = z.multiply(d).mod(p); byte[] plainTextArray = P.toByteArray(); return new String(plainTextArray); } }

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  • gcc does not generate debugger info when using -g, -ggdb, -g3, or -ggdb3

    - by CJJ
    I'm using GCC 4.4.1 and GDB 7.0-ubuntu on Ubuntu 9.10. However, GCC won't generate debugger info when using any of the following switches: -g, -g3, -ggdb, or -ggdb3. So when I run the program with GDB, its as if there was no debugger information generated. I have created very simple test source files in a new, empty folder. Here is one example: #include <stdlib.h> #include <stdio.h> int main (int argc, char **argv) { char msg[4]; // allocate 4 bytes on the stack strcpy (msg, "hello world"); // overflow printf ("%s\n", msg); return 0; }

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  • Efficient algorithm for creating an ideal distribution of groups into containers?

    - by Inshim
    I have groups of students that need to be allocated into classrooms of a fixed capacity (say, 100 chairs in each). Each group must only be allocated to a single classroom, even if it is larger than the capacity (ie there can be an overflow, with students standing up) I need an algorithm to make the allocations with minimum overflows and under-capacity classrooms. A naive algorithm to do this allocation is horrendously slow when having ~200 groups, with a distribution of about half of them being under 20% of the classroom size. Any ideas where I can find at least some good starting point for making this algorithm lightning fast? Thanks!

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  • Explain the Peak and Flag Algorithm

    - by Isaac Levin
    EDIT Just was pointed that the requirements state peaks cannot be ends of Arrays. So I ran across this site http://codility.com/ Which gives you programming problems and gives you certificates if you can solve them in 2 hours. The very first question is one I have seen before, typically called the Peaks and Flags question. If you are not familiar A non-empty zero-indexed array A consisting of N integers is given. A peak is an array element which is larger than its neighbours. More precisely, it is an index P such that 0 < P < N - 1 and A[P - 1] < A[P] A[P + 1] . For example, the following array A: A[0] = 1 A[1] = 5 A[2] = 3 A[3] = 4 A[4] = 3 A[5] = 4 A[6] = 1 A[7] = 2 A[8] = 3 A[9] = 4 A[10] = 6 A[11] = 2 has exactly four peaks: elements 1, 3, 5 and 10. You are going on a trip to a range of mountains whose relative heights are represented by array A. You have to choose how many flags you should take with you. The goal is to set the maximum number of flags on the peaks, according to certain rules. Flags can only be set on peaks. What's more, if you take K flags, then the distance between any two flags should be greater than or equal to K. The distance between indices P and Q is the absolute value |P - Q|. For example, given the mountain range represented by array A, above, with N = 12, if you take: two flags, you can set them on peaks 1 and 5; three flags, you can set them on peaks 1, 5 and 10; four flags, you can set only three flags, on peaks 1, 5 and 10. You can therefore set a maximum of three flags in this case. Write a function that, given a non-empty zero-indexed array A of N integers, returns the maximum number of flags that can be set on the peaks of the array. For example, given the array above the function should return 3, as explained above. Assume that: N is an integer within the range [1..100,000]; each element of array A is an integer within the range [0..1,000,000,000]. Complexity: expected worst-case time complexity is O(N); expected worst-case space complexity is O(N), beyond input storage (not counting the storage required for input arguments). Elements of input arrays can be modified. So this makes sense, but I failed it using this code public int GetFlags(int[] A) { List<int> peakList = new List<int>(); for (int i = 0; i <= A.Length - 1; i++) { if ((A[i] > A[i + 1] && A[i] > A[i - 1])) { peakList.Add(i); } } List<int> flagList = new List<int>(); int distance = peakList.Count; flagList.Add(peakList[0]); for (int i = 1, j = 0, max = peakList.Count; i < max; i++) { if (Math.Abs(Convert.ToDecimal(peakList[j]) - Convert.ToDecimal(peakList[i])) >= distance) { flagList.Add(peakList[i]); j = i; } } return flagList.Count; } EDIT int[] A = new int[] { 7, 10, 4, 5, 7, 4, 6, 1, 4, 3, 3, 7 }; The correct answer is 3, but my application says 2 This I do not get, since there are 4 peaks (indices 1,4,6,8) and from that, you should be able to place a flag at 2 of the peaks (1 and 6) Am I missing something here? Obviously my assumption is that the beginning or end of an Array can be a peak, is this not the case? If this needs to go in Stack Exchange Programmers, I will move it, but thought dialog here would be helpful. EDIT

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  • I create a JPanel and GridBagLayout within an object but when I get it in the main object, attributes are missing

    - by chickeneaterguy
    public oijoij() { String name = "Jackie"; int priority = 50; int minPriority = 90; setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); JPanel panel = new JPanel(); GridBagLayout gbc_panel = new GridBagLayout(); gbc_panel.columnWidths = new int[]{0,0,0}; gbc_panel.rowHeights = new int[]{0, 0, 0, 0, 0, 0}; gbc_panel.columnWeights = new double[]{0.0, 0.0, Double.MIN_VALUE}; gbc_panel.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE}; panel.setBorder(new LineBorder(new Color(0,0,0),1)); panel.setLayout(gbc_panel); panel.setAlignmentX(Component.LEFT_ALIGNMENT); panel.setMinimumSize(new Dimension(110,110)); panel.setPreferredSize(new Dimension(110, 110)); panel.setSize(new Dimension(110,110)); JLabel lblNewLabel = new JLabel("Process ID:"); GridBagConstraints gbc_lblNewLabel = new GridBagConstraints(); gbc_lblNewLabel.gridheight = 2; gbc_lblNewLabel.insets = new Insets(0, 0, 5, 5); gbc_lblNewLabel.gridx = 0; gbc_lblNewLabel.gridy = 0; panel.add(lblNewLabel, gbc_lblNewLabel); JLabel lblNewLabel_1 = new JLabel(name); GridBagConstraints gbc_lblNewLabel_1 = new GridBagConstraints(); gbc_lblNewLabel_1.gridheight = 2; gbc_lblNewLabel_1.insets = new Insets(0, 0, 5, 0); gbc_lblNewLabel_1.gridx = 1; gbc_lblNewLabel_1.gridy = 0; panel.add(lblNewLabel_1, gbc_lblNewLabel_1); JLabel lblNewLabel_2 = new JLabel("Priority:"); GridBagConstraints gbc_lblNewLabel_2 = new GridBagConstraints(); gbc_lblNewLabel_2.insets = new Insets(0, 0, 5, 5); gbc_lblNewLabel_2.gridx = 0; gbc_lblNewLabel_2.gridy = 2; panel.add(lblNewLabel_2, gbc_lblNewLabel_2); JLabel lblNum = new JLabel(Integer.toString(priority)); GridBagConstraints gbc_lblNum = new GridBagConstraints(); gbc_lblNum.insets = new Insets(0, 0, 5, 0); gbc_lblNum.gridx = 1; gbc_lblNum.gridy = 2; panel.add(lblNum, gbc_lblNum); JLabel lblNewLabel_3 = new JLabel("Min Priority:"); GridBagConstraints gbc_lblNewLabel_3 = new GridBagConstraints(); gbc_lblNewLabel_3.insets = new Insets(0, 0, 5, 5); gbc_lblNewLabel_3.gridx = 0; gbc_lblNewLabel_3.gridy = 3; panel.add(lblNewLabel_3, gbc_lblNewLabel_3); JLabel lblMp = new JLabel(Integer.toString(minPriority)); GridBagConstraints gbc_lblMp = new GridBagConstraints(); gbc_lblMp.insets = new Insets(0, 0, 5, 0); gbc_lblMp.gridx = 1; gbc_lblMp.gridy = 3; panel.add(lblMp, gbc_lblMp); JLabel lblTimeSlice = new JLabel("Time Slice:"); GridBagConstraints gbc_lblTimeSlice = new GridBagConstraints(); gbc_lblTimeSlice.insets = new Insets(0, 0, 0, 5); gbc_lblTimeSlice.gridx = 0; gbc_lblTimeSlice.gridy = 4; panel.add(lblTimeSlice, gbc_lblTimeSlice); Random r = new Random(System.currentTimeMillis()); panel.setBackground(new Color( r.nextInt(255 - 210) + 210, r.nextInt(255 - 210) + 210, r.nextInt(255 - 210) + 210)); } I have accessor methods for the GridBagLayout and the JPanel. When calling the functions in another file, it looks like I just get the JPanel (but without any labels or the layout or other GridBagLayout features). Help?

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  • core data editor problems

    - by Peyman
    I was recommended by someone in Stack Overflow to use Core Data Editor http://christian-kienle.de/CoreDataEditor/ to manage the sqlite persistent store. However the latest version (3.0) crashes on launch everytime. Older versions load but I see nothing when i point the config to the persistent store and the object model directories. There is no documentation either. can someone point me to the right place to sort this problem? I am trying to find a more manageable way to coordinate core data development than sqlite consoles. thank you

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  • How do I solve this indexOutOfBoundsException in my server send/receive thread?

    - by Stefan Schouten
    I am creating a multiplayer game in Java with a server and multiple clients. Everything runs perfectly, until I press the Kick-button in the server to kick a client. Error at receive thread of server, after kicking the first person who joined out of three: java.lang.IndexOutOfBoundsException: Index: 2, Size: 2 at java.util.ArrayList.rangeCheck(ArrayList.java:604) at java.util.ArrayList.get(ArrayList.java:382) > at networktest.Server$3.run(Server.java:186) at java.lang.Thread.run(Thread.java:722) The pointed line is the ois = new ObjectInputStream where I send datatype. The server kicks the first person perfectly, but removes the second one in the list too, with an error of java.lang.ClassCastException. server receive: private static Thread receive = new Thread() { @Override public void run() { ObjectInputStream ois; while (true) { for (int i = 0; i < list_sockets.size(); i++) { try { ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); int receive_state = (Integer) ois.readObject(); // receive state ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); byte datatype = (byte) ois.readObject(); // receive datatype if(datatype == 2){ ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); ChatLine chatLine = (ChatLine) ois.readObject(); // receive ChatLine } else if (datatype == 0){ ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); DataPackage dp = (DataPackage) ois.readObject(); // receive dp list_data.set(i, dp); } if (receive_state == 1) // Client Disconnected by User { disconnectClient(i); i--; } } catch (Exception ex) // Client Disconnected (Client Didn't Notify Server About Disconnecting) { System.err.println("Error @ receive:"); ex.printStackTrace(); disconnectClient(i); i--; } } try { this.sleep(3); } catch (InterruptedException ex) { Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex); } } } }; user send: Thread send = new Thread() { public void run() { ObjectOutputStream oos; byte datatype = 0; while (connected){ if (socket != null){ try { DataPackage dp = new DataPackage(); dp.x = Client.player.x; dp.y = Client.player.y; dp.username = username; dp.charType = charType; dp.walking = (byte)Client.player.walking; if (Client.outputChatLine.line != null) datatype = 2; else { datatype = 0; } oos = new ObjectOutputStream(socket.getOutputStream()); oos.writeObject(Integer.valueOf(Client.this.state)); // send state oos = new ObjectOutputStream(socket.getOutputStream()); oos.writeObject(Byte.valueOf(datatype)); // send datatype if (datatype == 2) { oos.reset(); oos.writeObject(Client.outputChatLine); Client.outputChatLine = new ChatLine(); } else { oos = new ObjectOutputStream(socket.getOutputStream()); oos.writeObject(dp); } if (Client.this.state == 1) { connected = false; socket = null; JOptionPane.showMessageDialog(null, "Client Disconnected", "Info", 1); System.exit(0); } } catch (Exception ex){} } try { this.sleep(2); } catch (InterruptedException ex) { Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex); } } } }; disconnect client method: public static void disconnectClient(int index) { try { list_clients_model.removeElementAt(index); list_client_states.remove(index); list_data.remove(index); list_sockets.remove(index); } catch (Exception ex) {} } Does anyone know how to solve this?

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