Implementation of the Preorder Tree Traversal
Preorder traversal can be implemented using either recursion or iteration(using the stack).
The recursive approach is straightforward:
- Visit the root node.
- Recursively traverse the left subtree.
- Recursively traverse the right subtree.
Basic Operations and Complexity
Traversal” In the preorder traversal, each node is visited exactly once, which can result in O(n) time complexity where the n is a number of nodes in the tree. The space complexity of the recursive approach is O(h) where the h is the height of the tree due to the recursion stack.
Java Program for the Preorder Tree Traversal in Binary Tree
Preorder traversal is the method used to traverse the tree data structure. In the preorder traversal, the nodes are visited in the order: of root, left subtree, and right subtree. It is called as “preorder” because the root node is visited before its children. This traversal technique is widely used in the various tree-based algorithms and applications.
Representation of Binary Tree