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Construct Binary Tree From Preorder And Postorder Traversal

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1. You are given a partially written function to solve(Refer question video).
2. you will be given two arrays representing a valid PostOrder & PostOrder of a Binary Tree. Program is required to create a unique Binary Tree.
Input Format 
Input is managed for you.
Output Format 
Input is managed for you.
Question Video
Constraints 
0 <= Number of Nodes <= 10^9
-10^9 <= value of Node data <= 10^9
Valid PreOrder and PostOrder traversals.
Sample Input 
7
1 3 2 5 7 6 4
4 2 1 3 6 5 7
Sample Output 
2 -> 4 <- 6
1 -> 2 <- 3
. -> 1 <- .
. -> 3 <- .
5 -> 6 <- 7
. -> 5 <- .
. -> 7 <- .


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