# create perfect binary tree

After LK. 16 31 17 30 18 29 19 28 20 27 21 26 22 25 23 24, We use cookies to ensure you have the best browsing experience on our website. brightness_4 We keep doing this until queue is empty. edit The standard level order traversal idea will slightly change here. Writing code in comment? Experience, The above code prints specific level order from TOP to BOTTOM. close, link Approach 1: 4.5.1 Description (click on image to get a clear view). And while pushing children into queue, the enqueue order will be: 1st node’s left child, 2nd node’s right child, 1st node’s right child and 2nd node’s left child. 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This article is contributed by Anurag Singh. Recursively, a perfect binary tree can be defined as: A perfect binary tree is a type of binary tree in which every internal node has exactly two child nodes and all the leaf nodes are at the same level. What if tree is neither perfect, nor complete. This approach takes more memory than standard traversal. Please use ide.geeksforgeeks.org, generate link and share the link here. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. All the internal nodes have a degree of 2. By using our site, you It can be any general binary tree. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. Note: A perfect binary tree has 2 n+1-1 nodes, where n is the height. h. has 2. h + 1 – 1 nodes, the height is Θ(ln(n)), and the number of leaf nodes is 2. h. or (n + 1)/2. In standard Level Order Traversal, we enqueue root into a queue 1st, then we dequeue ONE node from queue, process (print) it, enqueue its children into queue. Attention reader! We can do standard level order traversal here too but instead of printing nodes directly, we have to store nodes in current level in a temporary array or list 1st and then take nodes from alternate ends (left and right) and print nodes. Instead of processing ONE node at a time, we will process TWO nodes at a time. Keep repeating this for all levels. 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Don’t stop learning now. Attention reader! While 5th level: 16(left), 31(right), 17(left), 30(right), .. are printed. It can be efficiently implemented as an array, where a node at index i has children at indexes 2i and 2i+1 and a parent at index i/2. We will see that a perfect binary tree of height . What if tree is not perfect, but complete. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Print the level order of nodes in following specific manner: i.e. Given a Perfect Binary Tree like below: Having introduced binary trees, the next two topics will cover two classes of binary trees: perfect binary trees and complete binary trees. Inorder Tree Traversal without recursion and without stack! This article is contributed by Anurag Singh.

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