Search found 639 matches

by daniel.is.fischer
Mon Dec 28, 2009 9:45 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 222
Replies: 14
Views: 4167

Re: Problem 222

Let's say a brute force approach is supposed to not be a good idea. Look at the function that gives you the length or saved length locally. It has a property which lets you find the optimal arrangement quite easily (assuming what you're studying is mathematics or has a large mathematical component, ...
by daniel.is.fischer
Mon Dec 21, 2009 9:31 am
Forum: Recreational
Topic: Something's wrong here...
Replies: 1
Views: 1042

Re: Something's wrong here...

Well, it may comfort you that the term "rational integers" is used in number theory to denote the members of Z (the integers one learns about in school). So if you're talking e.g. about numbers of the form ( a + b *[radic]2) where a and b are rational integers, it is perfectly reasonable to refer to...
by daniel.is.fischer
Fri Dec 18, 2009 3:40 pm
Forum: News, Suggestions, and FAQ
Topic: Accesibility of new problems
Replies: 7
Views: 3470

Re: Accesibility of new problems

Problem 269 is scheduled for today, Friday, 18th December, at 9 p.m. GMT.
Since the clock at PE is currently three hours ahead, the notification says Saturday, 12.a.m (midnight).
We are sorry about the confusion.
by daniel.is.fischer
Wed Nov 18, 2009 10:37 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 264
Replies: 18
Views: 3786

Re: Problem 264

I'm afraid that's too low.
by daniel.is.fischer
Mon Nov 16, 2009 5:01 pm
Forum: News, Suggestions, and FAQ
Topic: Can you change my name please?
Replies: 7
Views: 1994

Re: Can you change my name please?

I am Eduardo here in this forum, but vareedu in Project Euler. Would you like to cange my name to Eduardo in Project Euler, please? In Project Euler: Old name: vareedu New name: Eduardo Thanks. Eduardo. There's already a user eduardo , so I don't think Eduardo would be good (I don't even know for s...
by daniel.is.fischer
Thu Nov 05, 2009 3:24 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 094
Replies: 47
Views: 12459

Re: Problem 094

You're missing some, e.g. the second smallest.
by daniel.is.fischer
Wed Nov 04, 2009 11:39 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 262
Replies: 27
Views: 5436

Re: Problem 262

Depends on your notion of "reasonable". It's too far off to be a precision error.
by daniel.is.fischer
Wed Nov 04, 2009 11:36 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 093
Replies: 51
Views: 11182

Re: Problem 093

Yes, it does count. Intermediate results need not be integers, only the final result must be an integer.
by daniel.is.fischer
Sun Nov 01, 2009 12:13 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 261
Replies: 26
Views: 5682

Re: Problem 261

Both numbers are too low.
by daniel.is.fischer
Sat Oct 31, 2009 4:45 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 262
Replies: 27
Views: 5436

Re: Problem 262

No, it would be much shorter.
by daniel.is.fischer
Sat Oct 31, 2009 1:45 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 259
Replies: 18
Views: 4569

Re: Problem 259

No, the sum is much smaller, between 1010 and 1012.
by daniel.is.fischer
Sat Oct 31, 2009 1:43 pm
Forum: News, Suggestions, and FAQ
Topic: Request new language in drop down
Replies: 3
Views: 2071

Re: Request new language in drop down

'tis a dialect of Basic, isn't it?
So I suggest you choose that. If we had a separate category for every dialect of every language, that'd be too many.
Or is there a fundamental reason not to subsume vb.net under the heading Basic?
by daniel.is.fischer
Tue Oct 27, 2009 1:30 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 251
Replies: 15
Views: 5109

Re: Problem 251

i have wrote a program that successfully solve the problem for 1000,10000,100000 limits for a+b+c<=1000000 i getting 82444 That's far too low, should be 171128. however i'm keep getting the wrong answer :(,the answer i reciving begin with 919 does the computations needed to achive the solution goes...
by daniel.is.fischer
Mon Oct 26, 2009 5:29 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 133
Replies: 10
Views: 2936

Re: Problem 133

Well....wouldn't 2 be one of the primes you're trying to find? But in the example, it says that ''it is remarkable that 11, 17, 41, and 73 are the only four primes below one-hundred that can ever be a factor of R(10^n)" - and 2 is not included! ''it is remarkable that 11, 17, 41, and 73 are the onl...
by daniel.is.fischer
Mon Oct 26, 2009 1:43 pm
Forum: Number Theory
Topic: Quadratic Residues Question
Replies: 9
Views: 3528

Re: Quadratic Residues Question

Now I've just gotta figure out the relatively easy cases where D & m are not co-prime (for example, z 2 [cong] 36 (mod 135), where both D and m are divisible by 9). As long as p 2 divides D and m, z must be a multiple of p. Divide equation by p 2 to get w 2 [cong] ([frac]D,p 2 [/frac]) (mod ([frac]...
by daniel.is.fischer
Mon Oct 26, 2009 3:02 am
Forum: Number Theory
Topic: Quadratic Residues Question
Replies: 9
Views: 3528

Re: Quadratic Residues Question

What is a quadratic residue equation and how could you solve them? A question about quadratic residues 8-) And one way to solve such questions is to post them here :lol: Now the joking's done, an integer r is called a quadratic residue modulo n if there is a k with k 2 [cong] r (mod n ). So, given ...
by daniel.is.fischer
Sun Oct 25, 2009 1:16 am
Forum: Number Theory
Topic: Quadratic Residues Question
Replies: 9
Views: 3528

Re: Quadratic Residues Question

If a is even, a = 2 t *u, u odd (t < x), a isn't a square if t is odd, otherwise solve w 2 [cong] u (mod 2 x-t ) as above. The solutions to s 2 [cong] a (mod 2 x ) are then 2 t/2 *(k*2 x-t-1 [plusmn]w). First off, huuuuuge thanks for this. You're welcome :D It's something I've been trying to put to...
by daniel.is.fischer
Sun Oct 25, 2009 1:05 am
Forum: Clarifications on Project Euler Problems
Topic: Problem 210
Replies: 69
Views: 15841

Re: Problem 210

I suggest you look at Thales' theorem (or its generalisation). That should tell you exactly what shape the figure is.
by daniel.is.fischer
Sat Oct 24, 2009 10:12 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 261
Replies: 26
Views: 5682

Re: Problem 261

No, the sum for 108 ends in 7.
by daniel.is.fischer
Sat Oct 24, 2009 7:29 pm
Forum: Clarifications on Project Euler Problems
Topic: Problem 133
Replies: 10
Views: 2936

Re: Problem 133

Quite.