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In linked list implementation of a queue, the important condition for a queue to be empty is?

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In linked list implementation of a queue, the important condition for a queue to be empty is?

(a) FRONT is null

(b) REAR is null

(c) LINK is empty

(d) FRONT==REAR-1

This interesting question is from Queue using Linked List in portion Abstract Data Types of Data Structures & Algorithms I

I got this question during an interview.

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Best answer
Correct choice is (a) FRONT is null

Explanation: Because front represents the deleted nodes.

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