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

Solution

We can solve this problem using a single queue. Let’s suppose that, at any time, we have all the nodes of the $k^{​th}$ 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 $k+1$ level. Start with adding root nodes as the first level to the queue and follow the steps mentioned above.