Algorithms Analysis Practice Test 2025 – All-in-One Mastery Guide to Exam Success

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Question: 1 / 400

If the characters 'D', 'C', 'B', 'A' are placed in a queue and then removed one at a time, what will be the order of removal?

ABCD

ABDC

DCAB

When characters are placed in a queue, they follow the First In, First Out (FIFO) principle, meaning that the first character added to the queue will be the first one to be removed. In this scenario, the characters 'D', 'C', 'B', and 'A' are enqueued in that order.

To visualize the process:

1. Initially, the queue contains: D (front), C, B, A (back).

2. As we start to remove characters, the first character to be removed is 'D', leaving the queue with: C (front), B, A (back).

3. The next character to be removed is 'C', resulting in: B (front), A (back).

4. After that, 'B' is removed, leading to: A (front).

5. Lastly, 'A' is removed, leaving the queue empty after all characters have been processed.

Therefore, the order of removal is 'D', 'C', 'B', and 'A', which can be represented as DCBA. This aligns with the provided correct answer.

Algorithms Analysis Practice Test 2025 – All-in-One Mastery Guide to Exam Success

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