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iterative postorder traversal

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iterative postorder traversal

We have discussed iterative inorder and iterative preorder traversals. The only difference is that the right child is visited before left child, and therefore the sequence is “root right left” instead of “root left right”. The idea is to push reverse postorder traversal to a stack. Now the question is, how to get reversed postorder elements in a stack – the second stack is used for this purpose. Experience. So, we can do something like iterative preorder traversal with the following differences: This article is compiled by Aashish Barnwal. Given a binary tree, write iterative and recursive solution to traverse the tree using post-order traversal in C++, Java and Python. While poping if you find stack top() is same as root then go for root->right else print root. While moving down, push root and root’s right child to stack. Once we have the reversed postorder traversal in a stack, we can just pop all items one by one from the stack and print them; this order of printing will be in postorder because of the LIFO property of stacks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. We have discussed a simple iterative postorder traversal using two stacks in the previous post. The idea is to push reverse postorder traversal to a stack. If take a closer look at this sequence, we can observe that this sequence is very similar to the preorder traversal. Print Postorder traversal from given Inorder and Preorder traversals, Construct Tree from given Inorder and Preorder traversals, Construct a Binary Tree from Postorder and Inorder, Construct Full Binary Tree from given preorder and postorder traversals, Stack Data Structure (Introduction and Program), Check for Balanced Brackets in an expression (well-formedness) using Stack, iterative postorder traversal using two stacks, Iterative Postorder Traversal of N-ary Tree, Construct a BST from given postorder traversal using Stack, Postorder traversal of Binary Tree without recursion and without stack, Level order traversal in spiral form | Using one stack and one queue, Find n-th node in Postorder traversal of a Binary Tree, Find parent of given node in a Binary Tree with given postorder traversal, Check if a binary tree is subtree of another binary tree using preorder traversal : Iterative, Stack | Set 3 (Reverse a string using stack), Construct Full Binary Tree using its Preorder traversal and Preorder traversal of its mirror tree, Level order traversal of Binary Tree using Morris Traversal, Iterative Preorder Traversal of an N-ary Tree, Iterative Boundary Traversal of Complete Binary tree, Iterative diagonal traversal of binary tree, Level order traversal in spiral form using stack and multimap, Level order traversal line by line | Set 3 (Using One Queue), Implement a stack using singly linked list, Stack | Set 4 (Evaluation of Postfix Expression), Write a Program to Find the Maximum Depth or Height of a Tree, Binary Tree | Set 3 (Types of Binary Tree), A program to check if a binary tree is BST or not, Write Interview Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. This article is compiled by Aashish Barnwal. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. The idea is to move down to leftmost node using left pointer. Don’t stop learning now. In this post, iterative postorder traversal is discussed, which is more complex than the other two traversals (due to its nature of non-tail recursion, there is an extra statement after the final recursive call to itself). Once we reach leftmost node, print it if it doesn’t have a right child. Postorder traversal can easily be done using two stacks, though. For example, in the following tree, we need to get 1, 3, 7, 6, 2, 5, 4 in a stack. private void postOrder(Node root){ if(root == null) return; postOrder(root.left); postOrder(root.right); System.out.println(root.value); } Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. Iterative preorder traversal can be easily implemented using two stacks.

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