Left View Of A Binarytree

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1. Given a Binary Tree, print left view of it. 
2. Left view of a Binary Tree is set of nodes visible when tree is viewed from left side.
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
1
1
1
1
1


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