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frew@mclean.com > grandparentHeap
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Return the value of the grandparent for the given index, or -1 if no grandparent.


grandparentHeap([0, 2, 4, 5, 6, 7, 10, 20, 8, 11, 9], 3) → -1
grandparentHeap([0, 2, 4, 5, 6, 7, 10, 20, 8, 11, 9], 2) → -1
grandparentHeap([0, 2, 4, 5, 6, 7, 10, 20, 8, 11, 9], 4) → 2

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public int grandparentHeap(int[] heap, int index) { }

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