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Construct a Binary Tree from Given Inorder and DepthFirstSearch.
Objective:  Given an inorder and preorder traversal, construct a binary tree from that.
Input: Inorder traversal and DepthFirstSearch.
Approach:
int[] inOrder = { 8, 4, 2, 5, 1, 6, 3, 7, 9 };
int[] DFS = { 1, 2, 4, 8, 5, 3, 6, 7, 9 };
 The first element in DFS[] will be the root of the tree, here it's 1.
 Now the search element 1 in inorder[], say you find it at position i, once you find it, make note of elements which are left to i (this will construct the left subtree) and elements which are right to i ( this will construct the right subtree).
 See this step above and recursively construct the left subtree and link it root.left and recursively construct the right subtree and link it root.right.
 See the picture and code.
Code:
Output:
inorder traversal of constructed tree : 8 4 2 5 1 6 3 7 9
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