Search found 14 matches

by davidFashion
Mon Jun 06, 2011 2:28 am
Forum: Programming languages
Topic: Pick a Language
Replies: 19
Views: 19788

Re: Pick a Language

A programming challenge is handling change propagation in distributed multi tier business applications. Each time I created an automated migrated process for a large scale production application had it's own unique challenges. But ultimately, the business rules that govern such a system have less a...
by davidFashion
Sat Jun 04, 2011 3:26 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 095
Replies: 28
Views: 7401

Re: Problem 095

xe3tec wrote:Could someone gimme a hint how to optimize for speed? I already optimized everything (as far as I know math :lol: ) but it still takes quite some time, sometimes.
Are you repeating the same calculation multiple times?
by davidFashion
Sat Jun 04, 2011 1:01 am
Forum: Programming languages
Topic: Pick a Language
Replies: 19
Views: 19788

Re: Pick a Language

I have programmed the solutions to the problems on this site is Java. This is the language with which I have the most knowledge. Many (most, nearly all) of these problems require a significant amount of knowledge beyond what you know about your specific computer language. While solving these problem...
by davidFashion
Wed May 25, 2011 1:25 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 007
Replies: 50
Views: 12143

Re: Problem 007

I have variables that I am using to reference a point in the array, but those variables are longs In Java, an array index must be an int. For those that do not know Java, and int is a 32-bit integer. I get errors because it can't convert long to int or something. When using a long as an index to an...
by davidFashion
Mon May 23, 2011 2:39 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 012
Replies: 99
Views: 25909

Re: Problem 012

TripleM wrote:
davidFashion wrote:A factor is not a divisor.
Factor and divisor are synonyms and mean exactly the same thing.
Yes, you are correct. When I wrote "factor", I was thinking "prime factor". Thanks for the clarification.

Image
by davidFashion
Sun May 22, 2011 9:12 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 012
Replies: 99
Views: 25909

Re: Problem 012

my program(in java) is too slow to find the first factor with over 500 divisors. ... Other comments removed ... does anyone know a quicker way to find how many factors a number has? A factor is not a divisor. I would suggest reviewing your program to ensure that you are solving the requested proble...
by davidFashion
Wed May 18, 2011 6:33 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 014
Replies: 60
Views: 14245

Re: Problem 014

I don't see what I am doing wrong. I have a for loop going from a million down to two (I have tried the other way around also), and it checks if even or odd, and then does the correct formula, and then adds one to the count. For some reason, it is doing it only for the number 1 million, and then st...
by davidFashion
Sun May 15, 2011 1:08 am
Forum: Number Theory
Topic: Here's an interesting question -- Daffodil number problem
Replies: 6
Views: 4800

Re: Here's an interesting question -- Daffodil number probl

Very interesting! I conducted a training class in 2005 on Java performance tuning. The entire course was on a program that generated the Narcissistic numbers. We started the class with the default brute force program (for i = 1 to max - check if i is a narcissistic number). Then for each class, we d...
by davidFashion
Thu May 12, 2011 1:11 am
Forum: Programming languages
Topic: Java newbie
Replies: 2
Views: 1826

Re: Java newbie

I have used Eclipse for years, both personally and professionally. I would highly recommend this product.
by davidFashion
Mon May 02, 2011 5:06 pm
Forum: Programming languages
Topic: Netbeans ( java coding )
Replies: 2
Views: 2933

Re: Netbeans ( java coding )

Hi. Here is a complete program that shows how, when a button is pressed, that the information is read from the text field and displayed in a JOptionPane. Fundamentally, a Java ActionListener object is added to the button. At the place in the code where the ActionListener is added to the button, the ...
by davidFashion
Mon May 02, 2011 4:39 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 029
Replies: 18
Views: 5913

Re: Problem 29

For N = 12, distinct terms = 106.
For N = 13, distinct terms = 129.
by davidFashion
Mon Apr 04, 2011 9:34 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 013
Replies: 76
Views: 22272

Re: Skeptical that my answer is incorrect

I worked it out a couple of days ago. For the 50 digit summation one, I was giving the full answer not just the first 10 digits. The bizarre thing about the primes one was that I was using very different methods, including downloading the primes I needed, and getting the same answer! As it turns ou...
by davidFashion
Mon Mar 28, 2011 9:37 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 202
Replies: 24
Views: 8873

Re: Problem 202

I am close, but my number for 1000001 is off by 4. I'm getting 80844 instead of 80840. Can someone verify my answer for 227 bounces, 28 paths? That is, 19 paths per side but 5 of them exit before the required number of bounces. 121198 paths with 1000007 bounces? For 227, I also get 28 paths. For 10...
by davidFashion
Fri Mar 04, 2011 10:55 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 319
Replies: 23
Views: 7584

Re: Problem 319

Are these correct:

t(2) = 5
t(3) = 23
t(4) = 83
t(5) = 293
t(6) = 937
t(7) = 2995
t(8) = 9235
t(9) = 28396

I am asking because my value for t(10) is incorrect.