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

- 140.9K All Categories
- 103.7K Programming Languages
- 6.5K Assembler Developer
- 1.9K Basic
- 40K C and C++
- 2.9K C#
- 7.9K Delphi and Kylix
- 4 Haskell
- 9.7K Java
- 4.1K Pascal
- 1.3K Perl
- 2K PHP
- 550 Python
- 37 Ruby
- 4.4K VB.NET
- 1.6K VBA
- 20.9K Visual Basic
- 2.6K Game programming
- 317 Console programming
- 92 DirectX Game dev
- 1 Minecraft
- 112 Newbie Game Programmers
- 2 Oculus Rift
- 9K Applications
- 1.8K Computer Graphics
- 742 Computer Hardware
- 3.4K Database & SQL
- 535 Electronics development
- 1.6K Matlab
- 628 Sound & Music
- 258 XML Development
- 3.3K Classifieds
- 199 Co-operative Projects
- 198 For sale
- 190 FreeLance Software City
- 1.9K Jobs Available
- 603 Jobs Wanted
- 209 Wanted
- 2.9K Microsoft .NET
- 1.8K ASP.NET
- 1.1K .NET General
- 3.4K Miscellaneous
- 8 Join the Team
- 355 Comments on this site
- 70 Computer Emulators
- 2.1K General programming
- 187 New programming languages
- 627 Off topic board
- 208 Mobile & Wireless
- 80 Android
- 126 Palm Pilot
- 338 Multimedia
- 154 Demo programming
- 184 MP3 programming
- Bash scripts
- 27 Cloud Computing
- 53 FreeBSD
- 1.7K LINUX programming
- 370 MS-DOS
- Shell scripting
- 321 Windows CE & Pocket PC
- 4.1K Windows programming
- 942 Software Development
- 417 Algorithms
- 68 Object Orientation
- 92 Project Management
- 95 Quality & Testing
- 269 Security
- 7.7K WEB-Development
- 1.8K Active Server Pages
- 62 AJAX
- 4 Bootstrap Themes
- 55 CGI Development
- 28 ColdFusion
- 224 Flash development
- 1.4K HTML & WEB-Design
- 1.4K Internet Development
- 2.2K JavaScript
- 37 JQuery
- 307 WEB Servers
- 150 WEB-Services / SOAP

theburningmonk
Member Posts: **1**

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

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

© 1997-2015 Programmersheaven.com - All rights reserved.