Consider the following algorithm for doing a postorder

 
Consider the following algorithm for doing a postorder traversal of a binary tree with root vertex root.
Postorder(root)
if root != null then
Postorder(root.left);
Postorder(root.right);
visit root;
end if;
Prove that this algorithm runs in time Θ(n) when the input is an n-vertex binary tree.

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