Discussion
What does the AC-3 algorithm do?
Answer: C
AC-3 keeps a queue of arcs, revises each by deleting unsupported values, and re-queues the arcs pointing at any variable whose domain changed, terminating when the queue empties or a domain does. Its complexity is cubic in the number of variables for binary constraints. The other options misread the numeral. A worklist algorithm that reprocesses only what a change could have affected is a pattern common to many propagation problems.
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