From: Radu Grigore <radugrigore@gmail.com>
To: fa.caml@googlegroups.com
Cc: caml-list@inria.fr, Jean-Christophe.Filliatre@lri.fr
Subject: Re: [Caml-list] Priority queues
Date: Fri, 1 Jul 2011 15:37:01 -0700 (PDT) [thread overview]
Message-ID: <0bb28c99-9ffd-4b5d-b073-8aff7af00493@glegroupsg2000goo.googlegroups.com> (raw)
In-Reply-To: <fa.zXwbS6BNVmuh5Yg3lR+NAiHb7b8@ifi.uio.no>
On Friday, July 1, 2011 11:33:11 AM UTC+1, Andrew wrote:
> > - or your priority queue does not provide such an operation, and you
> > simply add another entry for y in the priority queue, with a different
> > key. It means you have now several entries for y in the priority queue.
> > The better will be extracted first; the others will be ignored when they
> > are extracted later. Complexity is now O(E log(V)).
>
> Just an extra question though: How come it's not O(E log (E))?
> You could end up pushing as much as one new element in
> your heap per edge, couldn't you?
If you use a Set of (distance, vertex) pairs together with min_elt then you can simulate decrease-key using remove followed by add.
next parent reply other threads:[~2011-07-01 22:37 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.zXwbS6BNVmuh5Yg3lR+NAiHb7b8@ifi.uio.no>
2011-07-01 22:37 ` Radu Grigore [this message]
2011-07-02 20:54 ` Brian Hurt
2011-06-30 11:30 Andrew
2011-06-30 11:40 ` Török Edwin
2011-06-30 11:56 ` Andrew
2011-06-30 12:13 ` Wojciech Meyer
2011-06-30 12:34 ` Andrew
2011-06-30 12:43 ` Wojciech Meyer
2011-06-30 17:29 ` Christophe Raffalli
2011-06-30 17:45 ` Christophe Raffalli
2011-06-30 12:28 ` Guillaume Yziquel
2011-06-30 12:33 ` Jean-Christophe Filliâtre
2011-06-30 13:19 ` Michael Ekstrand
2011-06-30 14:07 ` Alexandre Pilkiewicz
2011-06-30 14:20 ` Michael Ekstrand
2011-06-30 14:22 ` David Rajchenbach-Teller
2011-06-30 14:29 ` Wojciech Meyer
2011-06-30 17:11 ` Andrew
2011-06-30 22:51 ` Wojciech Meyer
2011-07-01 5:06 ` Andrew
2011-06-30 16:06 ` Jean-Christophe Filliâtre
2011-07-01 10:32 ` Andrew
2011-07-01 10:51 ` Frédéric van der Plancke
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