By Ramon E Moore

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A solution is to map the keys onto a relatively small integer range, using a function called a hash function. The resulting data structure, called hash tables, makes it possible to use keys drawn from an arbitrarily large universe as “subscripts,” much in the way small natural numbers are used as subscripts for a normal array. They are the basis for the implementation of the “associative arrays” available in some languages. More formally, suppose we want to store our set of size n in a table of size m.

7 Deﬁning Terms Algebraic computation tree: A tree combining simple algebraic operations with comparisons of values. Amortized cost: The cost of an operation considered to be spread over a sequence of many operations. Average-case cost: The sum of costs over all possible inputs divided by the number of possible inputs. Binary search tree: A binary tree that is lexicographically arranged so that, for every node in the tree, the nodes to its left are smaller and those to its right are larger. Binary search: Divide-and-conquer search of a sorted array in which the middle element of the current range is probed so as to split the range in half.

For both models, it can be shown that EUn = ESn = 1 1 + 1−α m 1 1 ln + α 1−α 1 m Again, for a full table the above expressions are useless, but we can prove that the search costs are (m) and (log m), respectively. Deletions cannot be done by simply erasing the given element, because searches would stop there and miss any element located beyond that point in its probe sequence. , still occupied for the purposes of searching, but free for the purposes of insertion) works at the expense of deteriorating the search time.