
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:3. An instance where the greedy algorithm gives an erroneous answer.
In this example, running the greedy algorithm
would give us a set with k = 6. However, from
an exhaustive search, a set of k = 5 satisfying
the conditions of the question can be found.
Graph H
в
A
K
E
We speculate that the reason why the greedy
algorithm gives an erroneous answer for this
6,
F
H
problem is because at some points during the process, there were several vertices which had
the same number of connected edges. If the algorithm were to pick at random, it might not pick
the vertex that can potentially lead to the best answer.
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