From: Berke Durak <berke@altern.org>
To: john.chu@east.sun.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Holding a set of random integers of very wide range?
Date: Mon, 2 Sep 2002 23:30:03 +0200 [thread overview]
Message-ID: <20020902213003.GC466@gogol> (raw)
In-Reply-To: <15731.25402.232987.3449@gargle.gargle.HOWL>
On Mon, Sep 02, 2002 at 09:10:18AM -0400, john.chu@east.sun.com wrote:
> For reasons I tried to explain in a previous draft of this e-mail and
> has been cut due to the amount of space it took, I need to generate
> multiple permuted lists of integers ranging from 0 to approximately
> 2^100 (or more, it's a bit open-ended unfortunately).
You can solve that problem in constant space by encrypting a counter
using a convenient block cipher (such as RC6 or idea). Since
encryption is bijective, you are assured of not hitting the same
integer twice. You have to somehow encode and decode integers, but in
runs in constant space and time.
--
Berke
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next prev parent reply other threads:[~2002-09-02 21:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3D70203F.1000106@ozemail.com.au>
2002-09-02 9:40 ` [Caml-list] Explaining bit sets Diego Olivier Fernandez Pons
2002-09-02 13:10 ` [Caml-list] Holding a set of random integers of very wide range? john.chu
2002-09-02 13:25 ` Noel Welsh
2002-09-02 17:18 ` Tim Freeman
2002-09-02 21:30 ` Berke Durak [this message]
2002-09-02 23:46 ` [Caml-list] Explaining bit sets Yamagata Yoriyuki
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