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In the standard notation, what quantity is written as g?

  • A.The estimated cost from the node to the goal
  • B.The cost of the path from the start to a node
  • C.The goal state the search is trying to reach
  • D.The number of goals the problem contains

Answer: B

g is the exact cost accumulated from the initial state to the node in question, known rather than estimated, and it is what uniform cost search orders on. The estimate of the remainder is h and the goal itself is not usually given a letter. Distinguishing an exact quantity from an estimated one in the notation is what makes the properties of the algorithms provable, since the guarantees rest on which of the two may be wrong.

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