Consider a sequence a of elements a0=1, a1=5, a2=7, a3=8, a4=9, and a5=2. The following operations are performed on a stack S and a queue Q, both of which

Question

Consider a sequence a of elements a0=1, a1=5, a2=7, a3=8, a4=9, and a5=2. The following operations are performed on a stack S and a queue Q, both of which are initially empty.
I: push the elements of a from a0 to a5 in that order into S.
II: enqueue the elements of a from a0 to a5 in that order into Q.
III: pop an element from S.
IV: dequeue an element from Q.
V: pop an element from S.
VI: dequeue an element from Q.
VII: dequeue an element from Q and push the same element into S.
VIII: Repeat operation VII three times.
IX: pop an element from S.
X: pop an element from S.
The top element of S after executing the above operations is __________.

Accepted Answer

8

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