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Regarding implementation of Breadth First Search using queues, what is the maximum distance between two nodes present in the queue? (considering each edge length 1)

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Regarding implementation of Breadth First Search using queues, what is the maximum distance between two nodes present in the queue? (considering each edge length 1)

(a) Can be anything

(b) 0

(c) At most 1

(d) Insufficient Information

This question was addressed to me in class test.

This intriguing question comes from Breadth First Search topic in division Graph Search of Data Structures & Algorithms II

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Right option is (c) At most 1

For explanation: In the queue, at a time, only those nodes will be there whose difference among levels is 1. Same as level order traversal of the tree.

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