Question: exercise 6.7 Create a subclass of BinaryTree whose nodes have fields for storing pre-order, post-order, and in-order numbers. Write recursive methods preOrderNumber(), inOrderNumber(), and postOrderNumbers()
exercise 6.7 Create a subclass of BinaryTree whose nodes have fields for storing pre-order, post-order, and in-order numbers. Write recursive methods preOrderNumber(), inOrderNumber(), and postOrderNumbers() that assign these numbers correctly. These methods should each run in O(n) time.
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