Question
Given a binary tree, a "zigzag" level order traversal prints the nodes level by level, but alternating the order of nodes from left-to-right and right-to-left for successive levels. For example, Level 0 (root) is L-R, Level 1 is R-L, Level 2 is L-R, and so on. Consider the following binary tree: ``` 3 / \ 9 20 / \ 15 7 ``` What is the output of a zigzag level order traversal for this tree?
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