AC-3 puts back on the queue every arc (Xk, Xi) whenever any value is deleted from the
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AC-3 puts back on the queue every arc (Xk, Xi) whenever any value is deleted from the domain of Xi, even if each value of Xk is consistent with several remaining values of X. Suppose that, for every arc (Xk, Xi), we keep track of the number of remaining values of Xk that are consistent with each value of Xk. Explain how to update these numbers efficiently and hence show that arc consistency can he enforced in total time O (n2d2).
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The basic idea is to preprocess the constraints so that for each value of X we keep track of those ...View the full answer
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Related Book For
Artificial Intelligence A Modern Approach
ISBN: 978-0137903955
2nd Edition
Authors: Stuart J. Russell and Peter Norvig
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