How to do this iteratively?

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1

Binary Tree From Inorder And Postorder.

Input : 
        Inorder : [2, 1, 3]
        Postorder : [2, 3, 1]

Return : 
            1
           / \
          2   3

Link to the Online Judge: Binary Tree From Inorder And Postorder | InterviewBit

I am able to do this using recursive approach, but not sure how to proceed iteratively.Can you provide the approach?

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