Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Computer Science Posted 17 Sep 2017 My Price 4.00

Quadratic probing

Quadratic probing

Suppose that we are given a key k to search for in a hash table with positions 0, 1, ..., m - 1, and suppose that we have a hash function h mapping the key space into the set {0, 1, ..., m - 1}. The search scheme is as follows.

1. Compute the value i ← h(k), and set j ← 0.

2. Probe in position i for the desired key k. If you find it, or if this position is empty, terminate the search.

3. Set j ← (j + 1) mod m and i ← (i + j) mod m, and return to step 2. Assume that m is a power of 2.

a. Show that this scheme is an instance of the general "quadratic probing" scheme by exhibiting the appropriate constants c1 and c2 for equation (11.5).

b. Prove that this algorithm examines every table position in the worst case.

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Maurice Tutor
(5)
Status NEW Posted 17 Sep 2017 07:09 AM My Price 4.00

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