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### Design an algorithm for the following operations for a binary tree BT, and show the worst-case running times for each

INSTRUCTIONS TO CANDIDATES

Design an algorithm for the following operations for a binary tree BT, and show the
worst-case running times for each implementation:
preorderNext(x): return the node visited after node x in a pre-order traversal of BT.
postorderNext(x): return the node visited after node x in a post-order traversal of BT.
inorderNext(x): return the node visited after node x in an in-order traversal of BT.
2. (25 marks) Design a recursive linear-time algorithm that tests whether a binary tree satisfies the
search tree order property at every node.
3. (20 marks) Exercise 8.2. Illustrate what happens when the sequence 1, 5, 2, 4, 3 is added to an empty
ScapegoatTree, and show where the credits described in the proof of Lemma 8.3 go, and how they
are used during this sequence of additions.
4. (20 marks) Implement a commonly used hash table in a program that handles collision using linear
probing. Using (K mod 13) as the hash function, store the following elements in the table: {1, 5, 21,
26, 39, 14, 15, 16, 17, 18, 19, 20, 111, 145, 146}.
5. (20 marks) Exercise 6.7. Create a subclass of BinaryTree whose nodes have fields for storing
preorder, post-order, and in-order numbers. Write methods preOrderNumber(),
inOrderNumber(), and postOrderNumbers() that assign these numbers correctly. These
methods should each run in O(n) time.

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