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<H1>minimal perfect hashing</H1>
<P>
(algorithm)

<P>
<strong>Definition:</strong>
A <a href="perfecthash.html" tppabs="http://hissa.nist.gov/dads/HTML/perfecthash.html"><em>perfect hashing</em></a> function which maps each different <a href="key.html" tppabs="http://hissa.nist.gov/dads/HTML/key.html"><em>key</em></a> to a distinct integer and has the same number of possible integers as keys.  Formally, given a set of N <a href="key.html" tppabs="http://hissa.nist.gov/dads/HTML/key.html"><em>keys</em></a>, the size of the <a href="range.html" tppabs="http://hissa.nist.gov/dads/HTML/range.html"><em>range</em></a> is N.
<P><strong>See also</strong>
<a href="orderpresmph.html" tppabs="http://hissa.nist.gov/dads/HTML/orderpresmph.html"><em>order preserving minimal perfect hashing</em></a>.
<P><em>Note:
After BJ.</em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>
<H2>Implementation</H2>
Description and code for <a href="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://burtleburtle.net/bob/hash/perfect.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://burtleburtle.net/bob/hash/perfect.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://burtleburtle.net/bob/hash/perfect.html">minimal perfect hashing (C)</a>, <a href="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cco.caltech.edu/cco/texinfo/libgplusplus/gperf_3.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.cco.caltech.edu/cco/texinfo/libgplusplus/gperf_3.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.cco.caltech.edu/cco/texinfo/libgplusplus/gperf_3.html">gperf: near minimal perfect hashing (C++)</a>,

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If you have suggestions, corrections, or comments, please get in touch
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&nbsp;(<a href="mailto:paul.black@nist.gov">paul.black@nist.gov</a>).

<p>
Entry modified Mon Dec 27 16:14:06 1999.<BR>
HTML page formatted Mon Dec 27 16:23:53 1999.

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