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# Data Structures and Algorithms Written Assignment Five

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Ve281 Data Structures and Algorithms
Written Assignment Five
The assignment consists of four problems.
1. AVL tree
(a) Suppose that we insert a sequence of keys 2, 1, 3, 7, 9 into an initially empty AVL
tree. Draw the resulting AVL tree.
(b) Suppose that we further insert key 6 into the AVL tree you get in Problem (1a).
Draw the resulting AVL tree.

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Ve281 Data Structures and Algorithms
Written Assignment Five
The assignment consists of four problems.
1. AVL tree
(a) Suppose that we insert a sequence of keys 2, 1, 3, 7, 9 into an initially empty AVL
tree. Draw the resulting AVL tree.
(b) Suppose that we further insert key 6 into the AVL tree you get in Problem (1a).
Draw the resulting AVL tree.
(c) Suppose that we further insert keys 4, 5 into the AVL tree you get in Problem (1b).
Draw the resulting AVL tree.
(d) Suppose that we further insert keys 8, 10, 11, into the AVL tree you get in
Problem (1c). Draw the resulting AVL tree.
(e) Write down the balance factor for each node in the final AVL tree you get in
Problem (1d).
2. Red-black tree
(a) Suppose that we insert a sequence of keys 9, 3, 1 into an initially empty red-black
tree. Draw the resulting red-black tree.
(b) Suppose that we further insert key 6 into the red-black tree you get in Problem (2a). Draw the resulting red-black tree.
(c) Suppose that we further insert keys 2, 8 into the red-black tree you get in Problem (2b). Draw the resulting red-black tree.
(d) Suppose that we further insert key 7 into the red-black tree you get in Problem (2c). Draw the resulting red-black tree.
(e) Suppose that we further insert keys 4, 5 into the red-black tree you get in Problem (2d). Draw the resulting red-black tree.
When you draw the red-black tree, please indicate the color of each node in the tree.
For example, you can color each node or put a letter b/r near each node.
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3. Show that any arbitrary n-node binary search tree can be transformed into any other
arbitrary n-node binary search tree using O(n) rotations. (Hint: First show that at
most n−1 right rotations suffice to transform the tree into a right-skewed binary search
tree.)
4. Suppose that an AVL tree insertion breaks the AVL balance condition. Suppose node
P is the first node that has a balance condition violation in the insertion access path
from the leaf. Assume the key is inserted into the left subtree of P and the left child
of P is node A. Prove the following claims:
(a) Before insertion, the balance factor of node P is 1. After insertion and before
applying rotation to fix the violation, the balance factor of node P is 2.
(b) Before insertion, the balance factor of node A is 0. After insertion and before
applying rotation to fix the violation, the balance factor of node A cannot be 0.
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