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Vertical Order Traversal Of A Binarytree-ii

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1. Given a Binary Tree, print Vertical Order of it. 
2. For each node at position (row, col), its left and right 
   children will be at positions (row + 1, col - 1) and (row + 1, col + 1) 
   respectively. The root of the tree is at (0, 0).
3. The vertical order traversal of a binary tree is a list of top-to-bottom 
   orderings for each column index starting from the leftmost column and ending 
   on the rightmost column. There may be multiple nodes in the same row and same 
   column. In such a case, sort these nodes by their values.
4. For More Information Watch Question Video link below.
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 
0 -> 1 1 
1 -> 1 1 1 
2 -> 1 1


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