Chapter 20: Problem 14

Write a pseudocode algorithm for the preorder traversal.

Short Answer

Expert verified

Question: Write a pseudocode algorithm for performing a preorder traversal on a binary tree. Answer: ``` FUNCTION preorder_traversal(node) IF node IS NULL RETURN END IF VISIT(node) // Process the current node (e.g., print or store its value) preorder_traversal(node.left) // Traverse left subtree preorder_traversal(node.right) // Traverse right subtree END FUNCTION ```

Step by step solution

Understand the Preorder Traversal

Firstly, understand the order in which the nodes have to be visited in a preorder traversal. It follows a Root - Left subtree - Right subtree pattern.

Create a Pseudocode Function

Create a function, say `preorder_traversal(node)`, which takes a node as an input argument. The function will work as follows: 1. Check if the input node is empty (i.e., it's a null node). If it is, simply return. 2. If the input node is not empty, visit the current node (Print its value or store it in a list). 3. Recursively call the `preorder_traversal()` function on the left child of the current node. 4. Recursively call the `preorder_traversal()` function on the right child of the current node.

Pseudocode for Preorder Traversal Algorithm

``` FUNCTION preorder_traversal(node) IF node IS NULL RETURN END IF VISIT(node) // Process the current node (e.g., print or store its value) preorder_traversal(node.left) // Traverse left subtree preorder_traversal(node.right) // Traverse right subtree END FUNCTION ``` This pseudocode represents the preorder traversal algorithm for binary trees.

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Write a pseudocode algorithm for the preorder traversal.

Short Answer

Step by step solution

Understand the Preorder Traversal

Create a Pseudocode Function

Pseudocode for Preorder Traversal Algorithm

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