Definition: A perfect hashing function that maps each different key to a distinct integer and has the same number of possible integers as keys.
Formal Definition: A function f is a minimal perfect hash function for a set of keys K iff ∀ j, k ∈ K f(j) = f(k) → j = k and the range of f(k) is 1… |K|.
Generalization (I am a kind of ...)
perfect hashing, hash function.
Specialization (... is a kind of me.)
order-preserving minimal perfect hashing.
See also Pearson's hash.
Note: After BJ.
Edward A. Fox, Lenwood S. Heath, Qi Fan Chen and Amjad M. Daoud, Practical minimal perfect hash functions for large databases, CACM, 35(1):105-121, January 1992.
GPERF: A Perfect Hash Function Generator PDF document.
If you have suggestions, corrections, or comments, please get in touch with Paul Black.
Entry modified 9 May 2011.
HTML page formatted Tue Feb 12 10:57:43 2019.
Cite this as:
Paul E. Black, "minimal perfect hashing", in Dictionary of Algorithms and Data Structures [online], Vreda Pieterse and Paul E. Black, eds. 9 May 2011. (accessed TODAY) Available from: https://www.nist.gov/dads/HTML/minimalPerfectHash.html