複選題
(5) Which statement(s) is correct for arithmetic expressions?
(A) There is no parenthesis in a postfix expression.
(B) The first symbol in a prefix expression must be an operator.
(C) The first symbol in a postfix expression must be an operator.
(D) The amount of operands in a prefix is more than that of operators.

複選題(1) Build a binary search tree for the input sequence 12, 5, 7, 18, 19, 15, 14, 6, 13. It is assumed that the tree root is on level 1. (A) There are five levels in the tree. (B) 14 is on level 3. (C) If we want to search 16, the number of required node comparisons is 3. (D) The subtree rooted at 15 has 3 nodes (including 15).

複選題(2) Which statement(s) is correct for an AVL tree? (A) The absolute value of the level difference of any two leaves is at most one. (B) The absolute value of the height difference of any two subtrees on the same level is at most one. (C) A deletion needs at most two rotation operations to preserve an AVL tree to be a height-balanced tree. (D) After a new node is inserted, the tree height will not increase if rotation operations are performed.

複選題(3) In a stack structure, let u denote a push operation and o denote a pop operation. After a sequence of stack operations, consisting of 3 pushes and 3 pops, an input sequence 123 may change its order. For example, after uouuoo is performed, 123 will become 132. Which sequence(s) cannot be obtained from input 123 by stack operations? (A) 213 (B) 231 (C) 312 (D) 321.

複選題(4) Which statement(s) is correct for binary search on a sequence? (A) The sequence must be sorted. (B) Binary search can be implemented by an array. (C) Binary search can be implemented by a linked list. (D) The hashing technique is an implementation of binary search.

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