Algorithms

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Re: Please Tell me what kind of Encryption Algorithm is used : Henry Minute13-Jul-09 13:32 Henry Minute 13-Jul-09 13:32  Chris Maunder wrote: And the playfair cipher was far from useless Before the advent of the modern computer that almost certainly would have been true with a long enough key, I doubt it is now though. With a short key I have seen puzzle freaks break it with just pencil and paper. Admittedly modern Block Ciphers use similar techniques but again require computing power to even encrypt a message let alone break one. Henry Minute Do not read medical books! You could die of a misprint. - Mark Twain Girl: (staring) "Why do you need an icy cucumber?" “I want to report a fraud. The government is lying to us all.” minimal coverage Hamed_sm20025-Jul-09 21:18 Hamed_sm2002 5-Jul-09 21:18  i need minimal coverage algorithm or code by c++. this is the question: http://online-judge.uva.es/p/v100/10020.html[^] plz send to hhn1364@gmail.com. tnx Re: minimal coverage Tim Craig6-Jul-09 8:48 Tim Craig 6-Jul-09 8:48  Yet another cheater wanders in tracking crap. You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists. Project Euler Bulky Fellow4-Jul-09 23:44 Bulky Fellow 4-Jul-09 23:44  http://projecteuler.net/index.php?section=problems[^] The best part about the site is the different solutions available. Once you submit a correct answer, you'll be shown the solutions of others. I thought I was capable of writing optimal, bit-squeezed, minimal CPU/memory consuming code, until I solved some of the problems here and looked at the solutions of others. Life altering, especially if you are seeking to improve your coding logic and ability. Check it out. ASP - AJAX is SEXY. PERIOD. Re: Project Euler Luc Pattyn5-Jul-09 1:14 Luc Pattyn 5-Jul-09 1:14  Yep. I discovered it last week. Here[^] are my first impressions. Luc Pattyn [Forum Guidelines] [My Articles] The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Show formatted code inside PRE tags, and give clear symptoms when describing a problem. Re: Project Euler Bulky Fellow5-Jul-09 3:21 Bulky Fellow 5-Jul-09 3:21  Have you seen the code that some of the folks write in Assembler? Amazing stuff! ASP - AJAX is SEXY. PERIOD. Re: Project Euler Luc Pattyn5-Jul-09 11:48 Luc Pattyn 5-Jul-09 11:48  Yes, I noticed some assembly solutions, and several unfamiliar programming languages. So far I did everything using C#. Long time ago, when processing power was much lower, I did several things in assembly too. Not any more, unless I need vector processing (SIMD, MMX, SSE and the like). Luc Pattyn [Forum Guidelines] [My Articles] The quality and detail of your question reflects on the effectiveness of the help you are likely to get. Show formatted code inside PRE tags, and give clear symptoms when describing a problem. Hashing algorithm anishkannan30-Jun-09 20:59 anishkannan 30-Jun-09 20:59  anyone Help for give a article of Hash algorithm with Example( In our application we need for this algorithm to database search , so if u have any about this please share with me) Thanks Re: Hashing algorithm riced2-Jul-09 6:47 riced 2-Jul-09 6:47  http://www.google.co.uk/search?hl=en&as_q=&as_epq=hashing+algorithm&as_oq=&as_eq=&num=10&lr=&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images[^] Regards David R --------------------------------------------------------------- "Every program eventually becomes rococo, and then rubble." - Alan Perlis Web crawling for store prices ideal2429326-Jun-09 10:14 ideal24293 26-Jun-09 10:14  I've search google and can't find any realy good solutions to this and was wondering if anybody knew of any examples of algorithms that can look at a page and extract product information and pricing like some of the shopping sites do. I know this is possible because they do it, but I just can't find alot of information about the algorithms. Thanks Re: Web crawling for store prices Tim Craig26-Jun-09 18:11 Tim Craig 26-Jun-09 18:11  And which class is this assignment for? You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists. I'm a proud denizen of the Real Soapbox[^] ACCEPT NO SUBSTITUTES!!! Re: Web crawling for store prices ideal2429328-Jun-09 10:57 ideal24293 28-Jun-09 10:57  This is not for a class. I already hold 2 degrees in computer science. Just wondering if there are any sort of exisiting algorithms out there for doing this sort of thing. It is for a job. Re: Web crawling for store prices Tim Craig28-Jun-09 17:51 Tim Craig 28-Jun-09 17:51  ideal24293 wrote: It is for a job. Wow, yet another website doing cost comparisons. How many do we need? You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists. I'm a proud denizen of the Real Soapbox[^] ACCEPT NO SUBSTITUTES!!! Re: Web crawling for store prices Luc Pattyn29-Jun-09 0:17 Luc Pattyn 29-Jun-09 0:17  We urgently need a website doing comparisons of websites doing cost comparisons. Luc Pattyn [Forum Guidelines] [My Articles] DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care. Re: Web crawling for store prices brock20098-Jul-09 9:31 brock2009 8-Jul-09 9:31  Hey, If you have to real degrees in computer science is should be easy for you. So you should do your homework your self or you will never make it as a software engineer. Re: Web crawling for store prices ideal242938-Jul-09 10:13 ideal24293 8-Jul-09 10:13  Well, I've never seen a forum less helpful than this one. Why does everyone think that I'm trying to have homework done? That would be stupid. When I went to college I paid too much to not have the professors help with any questions I may have with homework. Why would someone come here to have homework done? Re: Web crawling for store prices brock20098-Jul-09 11:53 brock2009 8-Jul-09 11:53  People are not help you because what you asked is a easy question. Any one with a degree in CS should be able to done this. Re: Web crawling for store prices ideal242938-Jul-09 12:19 ideal24293 8-Jul-09 12:19  What I was wanting was some sort of algorithm for pattern matching and finding these prices in a web page. Crawling a page is easy. Re: Web crawling for store prices brock20098-Jul-09 13:49 brock2009 8-Jul-09 13:49  That what you want to college for. Try to design the algorithm your self. Show that you have tried something your self than you might get some help. Re: Web crawling for store prices ideal242938-Jul-09 15:07 ideal24293 8-Jul-09 15:07  I didn't want to reinvent the wheel. I was just checking to see if there was anything out there that I could start with. I do have things in mind of how to do it, but if there's something already out there, why not use it? Would you write a linked list implementation when there's already one out there in the STL? Re: Web crawling for store prices ideal2429329-Jun-09 2:17 ideal24293 29-Jun-09 2:17  So is everyone just going to make snarky comments and offer no help? You don't even know that this is for a price comparison site. There are many, many more possibilites for such information. Re: Web crawling for store prices [modified] Tim Craig29-Jun-09 13:45 Tim Craig 29-Jun-09 13:45  ideal24293 wrote: So is everyone just going to make snarky comments and offer no help? Since we get so many people coming in here and essentially wanting us to do their homework for them, we tend to be skeptical. You were lucky enough to make your first post on the site with a question that sounded a lot like homework. It's usually the first post of the homework seekers. You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists. I'm a proud denizen of the Real Soapbox[^] ACCEPT NO SUBSTITUTES!!! modified on Thursday, July 2, 2009 6:37 PM Please tell me what encryption algorithm is this sammyy_nds25-Jun-09 13:54 sammyy_nds 25-Jun-09 13:54  CREATE FUNCTION [dbo].[EncryptPwd] (@strInput VARCHAR(15)) RETURNS VARCHAR(15) AS BEGIN DECLARE @strOutput VARCHAR(15), @intEncrypt TINYINT DECLARE @position int SET @strOutput='' SET @position = 1 SET @intEncrypt=165 WHILE @position <= LEN(@strInput) BEGIN SET @intEncrypt=ASCII(SUBSTRING(@strInput, @position, 1)) ^ @intEncrypt SET @strOutput= @strOutput+CHAR(@intEncrypt) SET @position = @position + 1 END RETURN @strOutput END Re: Please tell me what encryption algorithm is this Luc Pattyn25-Jun-09 14:29 Luc Pattyn 25-Jun-09 14:29  Hi, I don't know whether this has a specific name, it is a character-oriented cypher, it is cumulative (each char depends on all previous ones), and it is symmetric (decrypt and encrypt use the same code); furthermore it is simple and weak. Luc Pattyn [Forum Guidelines] [My Articles] DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care. Approximating a function over multiple points Maverick8925-Jun-09 8:10 Maverick89 25-Jun-09 8:10  Hello! A lot of math here: I have 4 points and I want to have a "soft-curved" function approximating them best, without going too far from the track. I used a polynom like a*x^3 + b*x^2 + .... and used CAS to calculate algebraic solutions for values of a,b,c,d from the point coordinates. It works, but the curve I get, while going through the points, takes long curves away, here an example: Anyone knows a better solution?

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