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Home/Magazine Archive/January 1980 (Vol. 23, No. 1)/Minimal perfect hash functions made simple/Abstract

Minimal perfect hash functions made simple

By Richard J. Cichelli
Communications of the ACM, January 1980, Vol. 23 No. 1, Pages 17-19
10.1145/358808.358813
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A method is presented for computing machine independent, minimal perfect hash functions of the form: hash value ← key length + the associated value of the key's first character + the associated value of the key's last character. Such functions allow single probe retrieval from minimally sized tables of identifier lists. Application areas include table lookup for reserved words in compilers and filtering high frequency words in natural language processing. Functions for Pascal's reserved words, Pascal's predefined identifiers, frequently occurring English words, and month abbreviations are presented as examples.

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