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Construct Binary Tree from Preorder and Inorder Traversal
Construct and return the binary tree from preorder and inorder traversals Example: preorder=[3,9,20,15,7], inorder=[9,3,15,20,7] => [3,9,20,null,null,15,7]
Preorder hands me each root. Inorder shows what sits left and right of it, so I recurse on both halves.
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1Construct Binary Tree from Preorder and Inorder Traversalmedium