It looks like you're new here. If you want to get involved, click one of these buttons!

- 140.8K All Categories
- 104.4K Programming Languages
- 6.4K Assembler Developer
- 1.8K Basic
- 39.7K C and C++
- 4.2K C#
- 7.9K Delphi and Kylix
- 4 Haskell
- 9.6K Java
- 4.1K Pascal
- 1.3K Perl
- 1.9K PHP
- 507 Python
- 48 Ruby
- 4.3K VB.NET
- 1.6K VBA
- 20.8K Visual Basic
- 2.6K Game programming
- 310 Console programming
- 88 DirectX Game dev
- 1 Minecraft
- 109 Newbie Game Programmers
- 2 Oculus Rift
- 8.9K Applications
- 1.8K Computer Graphics
- 726 Computer Hardware
- 3.4K Database & SQL
- 521 Electronics development
- 1.6K Matlab
- 627 Sound & Music
- 256 XML Development
- 3.3K Classifieds
- 191 Co-operative Projects
- 180 For sale
- 189 FreeLance Software City
- 1.9K Jobs Available
- 600 Jobs Wanted
- 201 Wanted
- 2.9K Microsoft .NET
- 1.7K ASP.NET
- 1.1K .NET General
- 3K Miscellaneous
- 3 Join the Team
- 0 User Profiles
- 349 Comments on this site
- 59 Computer Emulators
- 1.8K General programming
- 178 New programming languages
- 594 Off topic board
- 158 Mobile & Wireless
- 32 Android
- 124 Palm Pilot
- 335 Multimedia
- 151 Demo programming
- 184 MP3 programming
- 0 Bash scripts
- 18 Cloud Computing
- 52 FreeBSD
- 1.7K LINUX programming
- 367 MS-DOS
- 0 Shell scripting
- 320 Windows CE & Pocket PC
- 4.1K Windows programming
- 881 Software Development
- 405 Algorithms
- 68 Object Orientation
- 86 Project Management
- 88 Quality & Testing
- 233 Security
- 7.5K WEB-Development
- 1.8K Active Server Pages
- 61 AJAX
- 2 Bootstrap Themes
- 55 CGI Development
- 19 ColdFusion
- 222 Flash development
- 1.4K HTML & WEB-Design
- 1.4K Internet Development
- 2.2K JavaScript
- 33 JQuery
- 285 WEB Servers
- 119 WEB-Services / SOAP

Welcome to the new platform of Programmer's Heaven! We apologize for the inconvenience caused, if you visited us from a broken link of the previous version. The main reason to move to a new platform is to provide more effective and collaborative experience to you all. Please feel free to experience the new platform and use its exciting features. Contact us for any issue that you need to get clarified. We are more than happy to help you.

theburningmonk
Posts: **1**Member

in Algorithms

Hi,

This is my first post, and I have been stuck with this problem for a while now so I was wondering if any of you guys might be able to help or know a good place for me to go and do some more investigation myself.

Here's the problem:

I have 2 lists of integer numbers (list A and list and am looking for subsets within each whose sums match. The numbers can be negative, under the assumption that:

- the same number does not appear in both lists (e.g. if 4 is in list A then it doesn't exist in list

The problem is similar to the subset sum problem:

http://en.wikipedia.org/wiki/Subset-sum_problem

except that I'm looking for subsets on both sides.

Here's an example:

List A

4

5

9

10

1

List B

21

7

-4

180

So the only match here is:

{10, 1, 4, 9} <=> {21, 7, -4}

Does anyone know if there are existing algorithms for this kinda problems?

So far, the only solution I have is a brute force approach which tries every combination but it performs in Exponential time and I've had to put a hard limit on the number of elements to consider to avoid it from taking too long.

The only other solution I can think of is to run a factorial on both lists and look for equalities there but that is still not very efficient and takes exponentially longer as the lists get bigger..

Any help will be much appreciated!

Thanks,

Yan

This is my first post, and I have been stuck with this problem for a while now so I was wondering if any of you guys might be able to help or know a good place for me to go and do some more investigation myself.

Here's the problem:

I have 2 lists of integer numbers (list A and list and am looking for subsets within each whose sums match. The numbers can be negative, under the assumption that:

- the same number does not appear in both lists (e.g. if 4 is in list A then it doesn't exist in list

The problem is similar to the subset sum problem:

http://en.wikipedia.org/wiki/Subset-sum_problem

except that I'm looking for subsets on both sides.

Here's an example:

List A

4

5

9

10

1

List B

21

7

-4

180

So the only match here is:

{10, 1, 4, 9} <=> {21, 7, -4}

Does anyone know if there are existing algorithms for this kinda problems?

So far, the only solution I have is a brute force approach which tries every combination but it performs in Exponential time and I've had to put a hard limit on the number of elements to consider to avoid it from taking too long.

The only other solution I can think of is to run a factorial on both lists and look for equalities there but that is still not very efficient and takes exponentially longer as the lists get bigger..

Any help will be much appreciated!

Thanks,

Yan

About & Contact / Terms of use / Privacy statement / Publisher: Lars Hagelin

Programmers Heaven articles / Programmers Heaven files / Programmers Heaven uploaded content / Programmers Heaven C Sharp ebook / Operated by CommunityHeaven LLC

© 1997-2013 Programmersheaven.com - All rights reserved.