Solution Review: Print Level Order Line by Line Using One Queue

Let’s take a detailed look at the previous challenge’s solution.

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We can solve this problem using a single queue. Let’s suppose that, at any time, we have all the nodes of the kthk^{​th} level present in a queue. We can find the count of these elements. We can process elements from the queue count number of times and add their children to the queue. Then, we can print a new line. At this point, we have all the nodes at the k+1k+1 level. Start with adding root nodes as the first level to the queue and follow the steps mentioned above.

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