EBK DATA STRUCTURES AND ALGORITHMS IN C
EBK DATA STRUCTURES AND ALGORITHMS IN C
4th Edition
ISBN: 9781285415017
Author: DROZDEK
Publisher: YUZU
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Chapter 3, Problem 20E
Program Plan Intro

Techniques for rearranging nodes in the List:

  • While ordering the records in the self-organizing list, normally the access probabilities of the records aren’t well known before.
  • This issue led the researchers to develop several heuristics to estimate optimal behaviour.
  • Some basic approaches used for reordering the records in the self-organizing list are given below.
    • Move–to–front method (MFT)
    • Transpose method.
    • Count method.
    • Ordering method.

Move–to–front method (MFT):

  • After the required record is sited, keep that at the head of the list.

Transpose method:

  • After the required record is sited, interchange that with its precursor.

Count method:

  • Ordering the self-organizing list by number of times the records are being processed.

Ordering method:

  • Ordering the self-organizing list by using definite criteria for information under analysis.

Explanation of Solution

(b) Cases in which the methods need an exhaustive search of the lists for every search:

  • A list “L” is searched exhaustively by the move to front method while searching for its last record. This needs the data to be composed in the same sequences of records as in the list “L”, however in the reverse order. For instance, if the list

    L = (p x r y) then the data sequence has to be (y r x p y r x p y r x p y…)...

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