perfecthash.html

来自「数据结构词典（英文）」· HTML 代码 · 共 50 行

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD W3 HTML 2.0//EN">
<HTML lang="en-US">
<HEAD>
<TITLE>perfect hashing</TITLE>
<META name="description"
  content="Definition of perfect hashing,
	possibly with links to more information and implementations.">
<META name="keywords" content="perfect hashing">
</HEAD>
<BODY BGCOLOR="#FFFFFF">

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

<P>
<strong>Definition:</strong>
A <a href="hash.html" tppabs="http://hissa.nist.gov/dads/HTML/hash.html"><em>hash</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.  Usually all possible keys must be known beforehand.  <a href="hashtab.html" tppabs="http://hissa.nist.gov/dads/HTML/hashtab.html"><em>Hash tables</em></a> which use a perfect hash have no <a href="collision.html" tppabs="http://hissa.nist.gov/dads/HTML/collision.html"><em>collisions</em></a>.
<P><strong>See also</strong>
<a href="minimalperfh.html" tppabs="http://hissa.nist.gov/dads/HTML/minimalperfh.html"><em>minimal perfect hashing</em></a>, <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>
See the implementations at <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://hissa.nist.gov/dads/HTML/minimal.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://hissa.nist.gov/dads/HTML/minimal.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://hissa.nist.gov/dads/HTML/minimal.html">minimal perfect hashing (C++, C)</A>, <a href="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/3316.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.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/3316.ins.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/3316.ins.c.html">insert (C)</a>, <a href="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/3316.srch.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.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/3316.srch.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/3316.srch.c.html">search (C)</a>.

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Go to the
<A HREF="terms.html" tppabs="http://hissa.nist.gov/dads/terms.html">Algorithms, Data Structures, and Problems</A>
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If you have suggestions, corrections, or comments, please get in touch
with
<a href="javascript:if(confirm('http://hissa.nist.gov/~black/black.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://hissa.nist.gov/~black/black.html'" tppabs="http://hissa.nist.gov/~black/black.html">Paul E. Black</a>
&nbsp;(<a href="mailto:paul.black@nist.gov">paul.black@nist.gov</a>).

<p>
Entry modified Mon Dec 27 16:14:24 1999.<BR>
HTML page formatted Mon Dec 27 16:23:54 1999.

<P>
This page's URL is
<A href="perfecthash.html" tppabs="http://hissa.nist.gov/dads/HTML/perfecthash.html">http://hissa.nist.gov/dads/HTML/perfecthash.html</A>

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