Pre Order Morris Traversal In Binary Tree

easy
Question Solve Solutions 
1. Given a Binary Tree, return Preorder Traversal of it. 
2. For more Information watch given video link below.

Input Format

Input is managed for you.

Output Format

Output is managed for you.

Constraints

0 <= Number of Nodes <= 10^5
-1000 <= value of Node data <= 1000

Notice

Try First, Check Solution later

1. You should first read the question and watch the question video.
2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed approach.

Example

Input
15
4
2
1
-1
-1
3
-1
-1
6
5
-1
-1
7
-1
-1
Output
4 2 1 3 6 5 7
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Binary Search Tree Iterator 2

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