Applying brute force on a huge problem

hi guys ,
i m kinda stuck with this ..
this is a project euler problem ... the problem is this
The following iterative sequence is defined for the set of positive integers:
n → n/2 (n is even)
n → 3n + 1 (n is odd)
Using the rule above and starting with 13, we generate the following sequence:
*13 → 40 → 20 → 10 → 5 → 16 → 8 → 4 → 2 → 1*
It can be seen that this sequence (starting at 13 and finishing at 1) contains 10 terms. Although it has not been proved yet (Collatz Problem), it is thought that all starting numbers finish at 1.
Which starting number, under one million, produces the longest chain?
NOTE: Once the chain starts the terms are allowed to go above one million.
i just went for straightforward bruteforce approach ...
heres my code
import java.io.*;
import java.util.*;
public class pro14
     public static void main(String args[])
          int j=0,pos=0;
                int upperlimit=1000000;
          ArrayList<Integer> temp = new ArrayList<Integer>();
          ArrayList<Integer> longest = new ArrayList<Integer>();
          for(int i=1;i<upperlimit;i++)
               temp.add(new Integer(i));
               j=i;
               while(j!=1)
                   if(j%2==0)
                       j=j/2;
                      else
                           j=3*j+1;
                     temp.add(new Integer(j));
                if(longest.size() < temp.size())
                     longest.clear();
                     for(int k=0;k<temp.size();k++)
                         longest.add(temp.get(k));
                    pos=i;
                temp.clear();
        System.out.println("The starting number that produces longest chain="+pos);
        for(int i=0;i<longest.size();i++)
            System.out.print(longest.get(i)+"->");
{code}the above code works for 100,1000,10000,100000 but not a million ... for example if i change upperlimit variable to 100000 (hundred thousand) i get the output as
{code:java}
The starting number that produces longest chain=77031
77031->231094->115547->346642->173321->519964->259982->129991->389974->194987->584962->292481->877444->438722->219361->658084->329042->164521->493564->246782->123391->370174->185087->555262->277631->832894->416447->1249342->624671->1874014->937007->2811022->1405511->4216534->2108267->6324802->3162401->9487204->4743602->2371801->7115404->3557702->1778851->5336554->2668277->8004832->4002416->2001208->1000604->500302->250151->750454->375227->1125682->562841->1688524->844262->422131->1266394->633197->1899592->949796->474898->237449->712348->356174->178087->534262->267131->801394->400697->1202092->601046->300523->901570->450785->1352356->676178->338089->1014268->507134->253567->760702->380351->1141054->570527->1711582->855791->2567374->1283687->3851062->1925531->5776594->2888297->8664892->4332446->2166223->6498670->3249335->9748006->4874003->14622010->7311005->21933016->10966508->5483254->2741627->8224882->4112441->12337324->6168662->3084331->9252994->4626497->13879492->6939746->3469873->10409620->5204810->2602405->7807216->3903608->1951804->975902->487951->1463854->731927->2195782->1097891->3293674->1646837->4940512->2470256->1235128->617564->308782->154391->463174->231587->694762->347381->1042144->521072->260536->130268->65134->32567->97702->48851->146554->73277->219832->109916->54958->27479->82438->41219->123658->61829->185488->92744->46372->23186->11593->34780->17390->8695->26086->13043->39130->19565->58696->29348->14674->7337->22012->11006->5503->16510->8255->24766->12383->37150->18575->55726->27863->83590->41795->125386->62693->188080->94040->47020->23510->11755->35266->17633->52900->26450->13225->39676->19838->9919->29758->14879->44638->22319->66958->33479->100438->50219->150658->75329->225988->112994->56497->169492->84746->42373->127120->63560->31780->15890->7945->23836->11918->5959->17878->8939->26818->13409->40228->20114->10057->30172->15086->7543->22630->11315->33946->16973->50920->25460->12730->6365->19096->9548->4774->2387->7162->3581->10744->5372->2686->1343->4030->2015->6046->3023->9070->4535->13606->6803->20410->10205->30616->15308->7654->3827->11482->5741->17224->8612->4306->2153->6460->3230->1615->4846->2423->7270->3635->10906->5453->16360->8180->4090->2045->6136->3068->1534->767->2302->1151->3454->1727->5182->2591->7774->3887->11662->5831->17494->8747->26242->13121->39364->19682->9841->29524->14762->7381->22144->11072->5536->2768->1384->692->346->173->520->260->130->65->196->98->49->148->74->37->112->56->28->14->7->22->11->34->17->52->26->13->40->20->10->5->16->8->4->2->1->
{code}so when i try the same for a million i get this
{code:java}
mintoo@mintoo pro14]$ java pro14
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
     at pro14.main(pro14.java:32)
{code}i have even tried
{code:java}
java -Xms512m -Xmx2048m pro14
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
     at java.util.Arrays.copyOf(Arrays.java:2772)
     at java.util.Arrays.copyOf(Arrays.java:2746)
     at java.util.ArrayList.ensureCapacity(ArrayList.java:187)
     at java.util.ArrayList.add(ArrayList.java:378)
     at pro14.main(pro14.java:32)
[mintoo@mintoo pro14]$
{code}
Edited by: mintoo2cool on Feb 8, 2010 4:10 AM

mintoo2cool wrote:
the above code works for 100,1000,10000,100000 but not a million ... for example if i change upperlimit variable to 100000 (hundred thousand) i get the output as You're also going to run into overflow problems if you're storing intermediate results using an int. The maximum value you can store in an integer variable is 2147483647, but if you run through the steps for the input number 113382 you'll see that about 120 steps in the calculated value (which is 2482111348) is greater than the maximum value you can store in the integer established above. So, what happens? Well, the actual value stored goes negative. So, once you have a negative number in your chain you're never coming back to positive and you'll end up with an infinite loop. This will probably be why you ran out of memory even after allocating a maximum of 2GB. Try using a long to store your intermediary values instead.

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tuolumne wrote:
Kostya1992 wrote:
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I remember that crazy wacko app spree like yesterday

tuolumne wrote:
Kostya1992 wrote:
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How does ironport deals with brute force attacks on ssh and https?
There is some kind of control?
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Hi and Welcome to the Forums!
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alexdiscus wrote:
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Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
Join our BBM Channels
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PIN: C0001B7B4 Display/Scan Bar Code
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https://www.dropbox.com/s/g1ey1xrheo9mvti/scrolling%20problems2.mov
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*Now the really wierd thing.* I decieded to contact Apple support on line and pay for help (yes that is weird in an of itself for me). As I began the process it came to the part for me to enter my serial number. With the lid open, I turned the MacBook on its side to try to read the number and the screen energized and the password unlock prompt was waiting for me to enter the password.
Observations
I had read where the light sensor could be blocked by dirt or the light in the room was too dim, but I clean the screen and there is plenty of light. Dales Post is the first that I have seen Parallels and the Sudden Motion Sensor. That makes some sense to me because of what happened when I turned it on its side. I have verified that it happens regardless of using Parallels. as teh last time I did it I had closed out of all my VMs and I believe exited Parallels.
I am going to try the deleting the power preferences file and will report back.

Huge problem using apple mail while sending email to a group...

Hey - I am quite confused... apple mail has huge problems using groups with about 150 addresses when writing and sending an email... the writing of emails is nearly impossible. Once the group name is inserted in the addressline (address book in iCloud!), apple mail uses nearly 100% CPU and further writing is nearly impossible. When sending such an email, all addresses are suddenly visible - though the box is NOT checked and the addresses should be hidden... what can I do? I use this feature (sending mails to groups) on a daily basis and cannot accept visible addresses...
Greetings and sorry for inconvenient english...
Christof

How about next time you send to the group, cc yourself, or include yourself in the group. Then receive the email on the iphone, you can "reply all" in order to send to the group. If you use an imap account, you can make a new folder, call it something like "groups", and save different group emails there for the next time you need to "reply all".

I am having some huge problems with my colorspace settings. Every time I upload my raw files from my Canon 5D mark II or 6D the pics are perfect in color. That includes the back of my camera, the pic viewer on my macbook pro, and previews. They even look

I am having some huge problems with my colorspace settings. Every time I upload my raw files from my Canon 5D mark II or 6D the pics are perfect in color. That includes the back of my camera, the pic viewer on my macbook pro, and previews. They even look normal when I first open them in photoshop. I will edit, save, and then realize once i've sent it to myself to test the color is WAY off. This only happens in photoshop. I've read some forums and have tried different things, but it seems to be making it worse. PLEASE HELP! Even viewing the saved image on the mac's pic viewer is way off once i've edited in photoshop. I am having to adjust all my colors by emailing myself to test. Its just getting ridiculous.

Check the color space in camera raw, the options are in the link at the bottom of the dialog box. Then when saving make sure you save it to the srgb color space when sending to others. Not all programs understand color space and or will default to srgb. That won't necessarily mean it will be accurate, but it will put it in the ballpark. Using save for web will use the srgb color space.

Huge problems using external iSight or DV video camera on my MPB DCD...

Ok, so I am developing some applications that make use of a video camera for motion tracking, and I have run into a huge problem when trying to use any external video camera. I have both an external iSight in great working order (I have tested it on my tower, which is also brand new, but on 10.4 for reasons of other applications not yet supported on 10.5.1) and also a Sony DCR-TRV520 NTSC Digital Handycam. (Once again, works perfectly when plugged in to the tower.) But if I plug either of them in to my MBP, no programs recognize their existence at all, be it iChat, iMovie, or my application. Nothing shows up in system profiler either. I try reboots, I get nothing... the internal iSight constantly takes over or is my only choice in applications.
And before you even ask, yes, my firewire port works, as I can plug my external firewire solo audio interface into it no problems, and no, I don't have any other firewire devices plugged in when trying to get the computer to recognize they are there.
Quick response would be awesome, as I am on a timeline to finish the program development and it is very important that I get this to work, preferably the Sony.

I just read this in their Forum mate ...
Cycling 74 has not yet finished evaluating Mac OS 10.5, aka Leopard.
As with any new OS, you are advised to tread cautiously if you are
considering updating. We are interested in hearing any and all reports
from users, and at some later date we shall publish full details of
our compatibility. Until that time use of our software on Leopard is unsupported.
If you wish to make reports of your experience with Leopard, please send them to support at cycling74 dot com

Anyone get a huge "Problem Report for iDVD" with hundreds of lines of information?

Anyone get a huge "Problem Report for iDVD" with hundreds of lines of information? This happens right before the DVD would be finished burning but instead crashes and leaves the long report your have to scroll down several times to read. I had to take several screen captures of the screen to get the WHOLE report. Here is two:
(If there is another thread on this - just answer the question or refer me to it. I'm past due on a big project. Don't have time to read all 21,000 discussions in the iDVD thread. Be kind. Thanks )

Some things to try first:
1. Disconnect any and all 3rd party devices that didn't ship with your mac directly from apple (both FW and USB included).
2. Restart your mac without any 3rd party devices attached whatsoever. That includes ext. hard drives, blue tooth devices, and any third party memory product/s. Basically, anything that doesn't come directly from apple has to go (at least while troubleshooting).
3. Need you to dispose of the plist for iDvd also. Go to you Home folder, the one that looks like a house > Library > Preferences > com.apple.iDvd.plist and drag and drop this file/s to the trash. Make sure to first quit iDvd prior to disposing of this pref. file/s.
4. Run apple's disc utility and repair permissions. Applicantions > Utilities > Disc Utility > Repair Permissions.
5. Restart your mac yet again, and try iDvd one more time.
6. If it's still at issue then please open iDvd from a separate user account and try your project one more time. If you don't know how to create a separate user account then just come on back and one of will show you how.
Good luck.
Message was edited by: SDMacuser

Applying brute force on a huge problem

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