Access Restriction

Author Yao, Andrew C.
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Copyright Year ©1985
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Abstract It was conjectured by J. Ullman that uniform hashing is optimal in its expected retrieval cost among all open-address hashing schemes [4]. In this paper, we show that, for any open-address hashing scheme, the expected cost of retrieving a record from a large table that is α-fraction full is at least (1/α) log (1/(1 - α)) + $\textit{o}(1).$ This proves Ullman's conjecture to be true in the asymptotic sense.
ISSN 00045411
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 1985-07-01
Publisher Place New York
e-ISSN 1557735X
Journal Journal of the ACM (JACM)
Volume Number 32
Issue Number 3
Page Count 7
Starting Page 687
Ending Page 693

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Source: ACM Digital Library