Given a binary tree of size N, your task is to complete the function zigZagTraversal(), that prints the nodes of binary tree in ZigZag manner.

For Example:
For the below binary tree the zigzag order 
traversal will be 1 3 2 7 6 5 4.

First line of input contains the number of test cases T. For each test case, there will be only a single line of input which is a string representing the tree as described below: 

  1. The values in the string are in the order of level order traversal of the tree where, numbers denotes node values, and a character “N” denotes NULL child.

  2. For example:

    For the above tree, the string will be: 1 2 3 N N 4 6 N 5 N N 7 N

For each test case print on a new line space-separated all the nodes of the tree in ZigZag manner.


3 2 1
7 7 9 8 8 6 N 10 9
3 1 2
7 9 7 8 8 6 9 10 

Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Harshit Sidhwa
Author: harshitsidhwa

If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.

Need help with your code? Please use, generate link and share the link here.

to report an issue on this page.