Postorder Traversal (Recursive)
Learning Traversals DSA practice problem on Onlearn.
Difficulty: easy.
Topics: Recursive Postorder Traversal of a Binary Tree, Binary Tree, Postorder Traversal, Recursion, Depth-First Search, Time Complexity, Space Complexity, Arrays, space complexity, binary tree, call stack, postorder traversal, recursion, time complexity analysis, tree traversal.
Problem Statement: Given the root of a Binary Tree, write a recursive function that returns an array containing the postorder traversal of the tree. Input Specification: The input will be the root node of a binary tree. Output Specification: Return an array of integers representing the postorder traversal of the tree. Sample 1: Input: Binary Tree: 4 2 5 3 1 7 6 1 9 1 1 8 1 1 (This represents the tree structure in a specific format, e.g., level order traversal where 1 signifies a null node) Output: [1, 9, 3, 2, 7, 8, 6, 5, 4] Explanation: We traverse the binary tree in the order of Left, Right then Root recursively resulting in the given traversal. Sample 2: Input: Binary Tree: 1 2 3 4 5 6 7 1 1 8 1 1 1 9 10 (This represents the tree structure in a specific format, e.g., level order traversal where 1 signifies a null node) Output: [1, 2, 4, 5, 8, 3, 6, 7, 9, 10] Explanation: We traverse the binary tree in the order of Left, Right then Root recursively resulting in the given traversal.