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Postorder Traversal

Given a binary tree, return the postorder traversal of its nodes’ values.

Example :

Given binary tree


return [3,2,1].

Using recursion is not allowed.

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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