Q. 51 Suppose a stack implementation supports an instruction REVERSE, which
reverses the order of elements on the stack, in addition to the PUSH and POP
instructions. Which one of the following statements is TRUE with respect to this
modified stack?
(A) A queue cannot be implemented using this stack
(B) A queue can be implemented where ENQUEUE takes a single instruction
and DEQUEUE takes a sequence of two instructions.
(C) A queue can be implemented where ENQUEUE takes a sequence of three
instructions and DEQUEUE takes a single instruction.
(D) A queue can be implemented where both ENQUEUE and DEQUEUE take a
single instruction each.
Answer: (C)
Explanation:
