$2.$ Using an array$-$based representation of a binary tree, the following array represents a binary tree.

$01234567891011121314$

$59$

$39$

$75$

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$48$

$70$

$80$

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$$

$44$

$$

$68$

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$$

$90$

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i$.$ Draw the binary tree that is represented by the above array.$<8>$

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ii$.$ What is the postorder traversal of the binary tree that is created in $($i$).<3>$

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What is the parent of $68?\_\_\_\_\_\_\_$