(data structure)

**Definition:**
An efficient implementation of a *priority queue*. The *linear hash* function monotonically maps keys to *buckets*, and each bucket is a *heap*.

**See also**
*bucket sort*.

*Note:
This is a bucket sort where the buckets are organized as heaps. The linear hash function maps increasing keys into nondecreasing values, that is, key1 > key2 implies h(key1) is greater than or equal to h(key2). It is not clear what happens if a bucket gets full. *

* Let R be the ratio between the key range and the range of the hash function. If R is so large there is only one bucket, we have a regular heap. If R is one, it is a direct mapped array. This data structure was proposed by Chris L. Kuszmaul <fyodor@nas.nasa.gov> in the news group comp.theory 13 January 1999.*

Author: PEB

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Entry modified 17 December 2004.

HTML page formatted Fri Mar 25 16:20:34 2011.

Cite this as:

Paul E. Black, "hash heap", in
*Dictionary of Algorithms and Data
Structures* [online], Paul E. Black, ed.,
U.S. National Institute of
Standards and Technology. 17 December 2004. (accessed TODAY)
Available from: http://www.nist.gov/dads/HTML/hashheap.html