?
Solved

Cryptarithmetic

Posted on 2010-11-16
3
Medium Priority
?
1,106 Views
Last Modified: 2012-05-10
Can you further explain these terms, especially in relation to this cryptarithmetic puzzle?


Backtracking: "The term backtracking search is used for a depth first search that chooses values for one variable at a time and backtracks when a variable has no legal moves left to assign."

Forward checking: "Whenever a variable X is assigned, the forward-checking process establishes arc-consistency for it: for each unassigned variable Y that is connected to X by a constraint, delete from Y's domain any value that is inconsistent with the value chosen for X."

MRV: Most constrained variable. "It also has been called the 'most constrained variable' or 'fail-first' heuristic, the latter because it picks a variable that is most likely to cause a failure soon, thereby pruning the search tree. If some variable X has no legal values left, the MRV heuristic will select X and failure will be detected immediately- avoiding pointless searches through other variables."

Least-constraining-value: "Once a variable has been selected, the algorithm must decide on the order in which to examine its values. For this, the least-constraining-value heuristic can be effective in some cases. It prefers the value that rules out the fewest choices for the neighboring variables in the constraint graph."

Information about cryptarithmetic: http://en.wikipedia.org/wiki/Cryptarithmetic
Diagram.PNG
0
Comment
Question by:JCW2
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 15

Accepted Solution

by:
David L. Hansen earned 2000 total points
ID: 34147748
Sorry that link will likely not work.  Try this one:
http://www.cs.ucc.ie/~gprovan/CS3315-FY08/Lectures/

look for lecture entitled:
"Lecture-12 CSP"
0
 

Author Closing Comment

by:JCW2
ID: 34149325
Thank you for your help.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this post we will learn different types of Android Layout and some basics of an Android App.
The SignAloud Glove is capable of translating American Sign Language signs into text and audio.
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …
This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.
Suggested Courses

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question