Subject

    Computer Science

    Topic

    Artificial Intelligence

    Bidirectional search runs two searches at the same time: one forward from the start and one ____.

    a)
    sideways from the middle
    b)
    upward from the deepest node
    c)
    backward from the goal
    d)
    randomly across the graph

    Explanation

    The searches stop when they meet. Each only needs to go about half the depth, so roughly O(b^(d/2)) nodes are explored.

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