Question: ( 6 ) Give you the root node of the binary tree, and expand it into a single linked list. ) It should be in

(6) Give you the root node of the binary tree, and expand it into a single linked list.) It should be in the same pre - order traversal order as the binary tree as the following picture. Please explain your idea at first, and then provide the pseudocode or source Code [2 marks]
 (6) Give you the root node of the binary tree, and

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