81.
Disadvantages of linked list representation of binary trees over arrays?

87.
Consider the following data and specify which one is Preorder Traversal Sequence, Inorder and Postorder sequences.
S1: N, M, P, O, Q
S2: N, P, Q, O, M
S3: M, N, O, P, Q

88.
Why Red-black trees are preferred over hash tables though hash tables have constant time complexity?

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