Width Of Shadow Of Binary Tree

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1. Given a Binary Tree, return Width Of Shadow Of A Binary Tree. 
2. For more detail watch the video.
Input Format
Input is managed for you.
Output Format
Output is managed for you. 
Question Video
Constraints
0 <= Number of Nodes <= 10^5
-1000 <= value of Node data <= 1000
Sample Input
15
1
1
-1
1
1
-1
1
-1
-1
1
-1
-1
1
-1
-1
Sample Output
3


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