From: Rick <rickduley@gmail.com>
Subject: Re: Inefficient algorithms
Date: Sat, 11 Sep 2010 02:07:24 -0700 (PDT)
Date: 2010-09-11T02:07:24-07:00 [thread overview]
Message-ID: <0ce6d303-c8ff-4688-8372-00238f52d1d4@s24g2000pri.googlegroups.com> (raw)
In-Reply-To: 8f0o4uFct8U1@mid.individual.net
On Sep 11, 3:07 pm, Niklas Holsti <niklas.hol...@tidorum.invalid>
wrote:
> Niklas Holsti wrote:
> > Rick wrote:
> >> I am working on a class in algorithmic efficiency and, to make a
> >> point, need an algorithm that runs O(2^n) - a factoring algorithm
> >> perhaps. All I can find is 'C' code I can't decipher. Can someone
> >> please help with an Ada example.
>
> > Perhaps the canonical example is this: you are given a Boolean formula
> > containing n Boolean variables. Find a valuation (a value, True or
> > False, for each variable) that makes the formula True.
>
> Replying to myself, since I realize that I probably misunderstood your
> need: what you want is an inefficient O(2^n) solution to an easy
> (non-exponential) problem. The problem I suggested is not, of course, an
> easy one. But it has easy variants. For example, require that the
> Boolean formula uses at most 10 of the n variables, where this limit
> (10) is considered a fixed number independent of the total number (n) of
> variables.
>
> --
> Niklas Holsti
> Tidorum Ltd
> niklas holsti tidorum fi
> . @ .
I must be a bit daft, Niklas, but I don't get it.
What sort of a Boolean formula are you talking about? How do I use it
in a recursive function?
You help is appreciated.
Thanks
next prev parent reply other threads:[~2010-09-11 9:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-11 4:24 Inefficient algorithms Rick
2010-09-11 6:51 ` J-P. Rosen
2010-09-13 3:45 ` Robert A Duff
2010-09-11 6:54 ` Niklas Holsti
2010-09-11 7:07 ` Niklas Holsti
2010-09-11 9:07 ` Rick [this message]
2010-09-11 15:05 ` Niklas Holsti
2010-09-17 5:26 ` Rick
2010-09-11 9:20 ` Ludovic Brenta
2010-09-11 9:23 ` Ludovic Brenta
2010-09-11 11:20 ` Niklas Holsti
2010-09-11 18:29 ` Peter C. Chapin
2010-09-11 14:28 ` stefan-lucks
2010-09-12 1:04 ` Wilson
2010-09-12 1:53 ` Rick
2010-09-12 8:35 ` Georg Bauhaus
2010-09-12 11:56 ` stefan-lucks
2010-09-15 1:11 ` BrianG
-- strict thread matches above, loose matches on Subject: below --
2010-09-15 8:51 Rick
2010-09-15 21:45 ` John B. Matthews
2010-09-16 12:05 ` Chad R. Meiners
2010-09-16 20:19 ` John B. Matthews
2010-09-17 5:24 ` Rick
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