Starting with an empty tree, adding 10, 15, 18, 8, 9, 5 and then removing 9 yields a post-order traversal of the tree that is 5, 8, 18, 15, 10.
One of the strategies for accessing a node in the tree is the postorder traversal. The LRN principle is utilised (Left-right-node). The postfix expression of a tree is obtained through postorder traversal.
There is a preorder and postorder traversal in DFS. Preordering is the process of going to the node before going to its children. Postorder order indicates that we only visit a node after visiting its children.
Binary tree postorder traversal is a traversal technique that visits the left subtree, then the right subtree, and ultimately the root node. In contrast to arrays and linked lists, which are linear data structures, binary trees are hierarchical and can be traversed in a variety of ways.
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