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<H1>hash heap</H1>
<P>
(data structure)

<P>
<strong>Definition:</strong>
An efficient implementation of a <a href="priorityque.html" tppabs="http://hissa.nist.gov/dads/HTML/priorityque.html"><em>priority queue</em></a>.  The  <a href="linearhash.html" tppabs="http://hissa.nist.gov/dads/HTML/linearhash.html"><em>linear hash</em></a> function monotonically maps keys to <a href="bucket.html" tppabs="http://hissa.nist.gov/dads/HTML/bucket.html"><em>buckets</em></a>, and each bucket is a <a href="heap.html" tppabs="http://hissa.nist.gov/dads/HTML/heap.html"><em>heap</em></a>.
<P><strong>See also</strong>
<a href="bucketsort.html" tppabs="http://hissa.nist.gov/dads/HTML/bucketsort.html"><em>bucket sort</em></a>.
<P><em>Note:
This is a bucket sort where the buckets are organized as heaps. The linear hash function maps increasing keys into nondecreasing values, that is, key1 &gt; key2 implies h(key1) is greater than or equal to h(key2).  It is not clear what happens if a bucket gets full. <P>Let R be the ratio between the key range and the range of the hash function.  If R is so large there is only one bucket, we have a regular heap.  If R is one, it is a direct mapped array.  This data structure was proposed by Chris L. Kuszmaul &lt;fyodor@nas.nasa.gov&gt; in the news group comp.theory 13 January 1999.</em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>

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Entry modified Mon Dec 27 15:33:24 1999.<BR>
HTML page formatted Mon Dec 27 16:23:52 1999.

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