NIST

quadratic probing

(algorithm)

Definition: A method of open addressing for a hash table in which a collision is resolved by putting the item in the next empty place given by a probe sequence. The space between places in the sequence increases quadratically.

See also double hashing, linear probing.

Note: Deletion may be hard because finding collisions again relies on not creating empty spots. One solution is to mark an entry as deleted so it can be reused for insertion, but the search list is intact.

Author: PEB

Implementation

insert (C and Pascal)

More information

An explanation of how quadratic equations got their name.


Go to the Dictionary of Algorithms and Data Structures home page.

If you have suggestions, corrections, or comments, please get in touch with Paul Black.

Entry modified 16 November 2009.
HTML page formatted Fri Feb 23 10:06:08 2018.

Cite this as:
Paul E. Black, "quadratic probing", in Dictionary of Algorithms and Data Structures [online], Vreda Pieterse and Paul E. Black, eds. 16 November 2009. (accessed TODAY) Available from: https://www.nist.gov/dads/HTML/quadraticprb.html