Level order zigzag problem

#1

i am not able to understand the input format of the question so please help.

#2

@Aryanomar00
You are being provided a modified preorder input where instead of -1 to denote that the node does not exist , you get input “false”. And if the node does exist , you are first given “true” and then its data.
Refer to this input function code and let me know if you have any trouble understanding.
Input function - https://ide.codingblocks.com/s/112907

#3

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