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What does the degree heuristic choose?

  • A.The variable involved in the most constraints on unassigned variables
  • B.The variable with the largest number of values in its domain
  • C.The value appearing in the fewest constraints of the problem
  • D.The variable at the greatest distance from the last assignment

Answer: A

Assigning the variable that constrains most others reduces the branching factor of the remaining problem fastest, and it is normally used to break ties in the minimum remaining values heuristic rather than on its own. Domain size is the remaining values measure, value selection is separate and distance is not used. Two heuristics used together, one primary and one for ties, is a common and effective arrangement.

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