📄 priorityque.html

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<H1>priority queue</H1>
<P>
(data structure)

<P>
<strong>Definition:</strong>
An <a href="abstracdtype.html" tppabs="http://hissa.nist.gov/dads/HTML/abstracdtype.html"><em>abstract data type</em></a> which efficiently supports finding the node with the highest priority across a series of operations.  The basic operations are: insert, find-minimum (or maximum), and delete-minimum (or maximum).  Some implementations also efficiently support join two priority queues (<a href="meld.html" tppabs="http://hissa.nist.gov/dads/HTML/meld.html"><em>meld</em></a>), delete an arbitrary node, and increase the priority of a node (decrease-key).
<P><strong>See also</strong>
<a href="discretintrv.html" tppabs="http://hissa.nist.gov/dads/HTML/discretintrv.html"><em>discrete interval encoding tree</em></a>, <a href="bestfirst.html" tppabs="http://hissa.nist.gov/dads/HTML/bestfirst.html"><em>best first search</em></a>, <a href="heap.html" tppabs="http://hissa.nist.gov/dads/HTML/heap.html"><em>heap</em></a>, <a href="hashheap.html" tppabs="http://hissa.nist.gov/dads/HTML/hashheap.html"><em>hash heap</em></a>, <a href="fibonacheap.html" tppabs="http://hissa.nist.gov/dads/HTML/fibonacheap.html"><em>Fibonnaci heap</em></a>.
<P><em>Note:
It can be implemented efficiently with a <a href="heap.html" tppabs="http://hissa.nist.gov/dads/HTML/heap.html"><em>heap</em></a>. After LK.</em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>
<H2>Implementation</H2>
Implemented as a heap: <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://watson2.cs.binghamton.edu/%7Eataub/cs333/project/classfiles/PriorityQueue.java  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://watson2.cs.binghamton.edu/%7Eataub/cs333/project/classfiles/PriorityQueue.java'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://watson2.cs.binghamton.edu/%7Eataub/cs333/project/classfiles/PriorityQueue.java">PriorityQueue class (Java)</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www-theory.dcs.st-and.ac.uk/%7Emda/cs2001/pqs/pqcode.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www-theory.dcs.st-and.ac.uk/%7Emda/cs2001/pqs/pqcode.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www-theory.dcs.st-and.ac.uk/%7Emda/cs2001/pqs/pqcode.html">insert, delete, etc. (Modula-2?)</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.ins.c.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.ins.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.ins.c.html">insert (C or Pascal)</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.del.c.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.del.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.del.c.html">delete (C or Pascal)</A> which uses <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.sift.c.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.sift.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.thunderstone.com/jump/demos/algorithms/algs/5/513.sift.c.html">siftup (C or Pascal)</A>. <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cs.sunysb.edu/%7Ealgorith/files/priority-queues.shtml  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cs.sunysb.edu/%7Ealgorith/files/priority-queues.shtml'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cs.sunysb.edu/%7Ealgorith/files/priority-queues.shtml">(C++, Pascal, and Fortran)</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.moorpark.cc.ca.us/%7Ecsalazar/cs20/nonlin.txt  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.moorpark.cc.ca.us/%7Ecsalazar/cs20/nonlin.txt'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.moorpark.cc.ca.us/%7Ecsalazar/cs20/nonlin.txt">(C++)</A>
<H2>More information</H2>
<A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://members.xoom.com/killough/heaps.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://members.xoom.com/killough/heaps.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://members.xoom.com/killough/heaps.html">links to papers</A>

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<p>
Entry modified Thu Oct  7 15:32:14 1999.<BR>
HTML page formatted Wed Dec 22 09:36:14 1999.

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