Convert a binary tree to a DLL such that a next node for DLL is selected in a top down order in zig-zag manner. O(n) space was allowed, but not O(2n)
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Convert binary tree to DLL in zig-zag order with O(n) space
Traverse the tree in level order using a queue
For each level, alternate between left-to-right and right-to-left order
Create a DLL using the n...read more
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