In a stack implementation using queues, what operation does the following code…
2023
In a stack implementation using queues, what operation does the following code represent?
public void fun(int x) {
q1.offer(x);
}
- A.
Perform push() with push as the costlier operation
- B.
Perform push() with pop as the costlier operation
- C.
Perform pop() with push as the costlier operation
- D.
More than one of the above
- E.
None of the above
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Show answer & explanation
Correct answer: B
q1.offer(x) inserts x at the rear of queue q1. In the context of implementing a stack using queues, this method represents push(). Since this push only performs one enqueue operation, it runs in O(1) time and does not reorder elements. The costly work is deferred to pop(), where elements must be moved or removed until the last inserted element becomes accessible. Therefore, the code performs push() with pop as the costlier operation. Hence, Option B is correct.