Suppose a queue contains ages of students in a class. Current elements in the queue are 10, 12, 14, 13, 11, 16, 15 what would be the contents of the queue if we perform 2 add (9) operations on it?

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Beltron Programmer 1 Oct 2023 Official Paper

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Answer 1

The correct answer is Option 4) 10, 12, 14, 13, 11, 16, 15, 9, 9.

Key Points

A queue is a linear data structure that follows the First-In-First-Out (FIFO) principle.
Elements are added at the rear (enqueue) and removed from the front (dequeue).
Given initial queue: 10, 12, 14, 13, 11, 16, 15
Two add(9) or enqueue(9) operations will insert two 9s at the end of the queue.
So the new queue becomes: 10, 12, 14, 13, 11, 16, 15, 9, 9

Additional Information

Stack follows LIFO (Last-In-First-Out), whereas Queue follows FIFO.
Common queue operations:
- enqueue() or add() → adds element at rear
- dequeue() or remove() → removes element from front
- peek() → retrieves the front element without removing it
Queues are widely used in CPU scheduling, printer queue management, and BFS traversal.

Conclusion: Since 9 is added twice to the end of the queue, the final content will be: 10, 12, 14, 13, 11, 16, 15, 9, 9.