Which traversal method uses a stack to keep track of nodes?

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Question: Which traversal method uses a stack to keep track of nodes?

Options:

Correct Answer: Preorder

Solution:

Preorder traversal can be implemented using a stack to keep track of nodes as we visit them in the order: root, left, right.

Which traversal method uses a stack to keep track of nodes?

Which traversal method uses a stack to keep track of nodes?

Step 1: Understand what a traversal method is. It is a way to visit all the nodes in a tree.
Step 2: Learn about the different types of tree traversal methods: preorder, inorder, and postorder.
Step 3: Focus on preorder traversal. In this method, we visit the root node first, then the left child, and finally the right child.
Step 4: Know that preorder traversal can be done using a stack. A stack is a data structure that helps keep track of nodes.
Step 5: When using a stack for preorder traversal, we push the root node onto the stack first.
Step 6: Then, we pop the node from the stack, visit it, and push its right child and then its left child onto the stack.
Step 7: Repeat this process until the stack is empty, ensuring we visit nodes in the order: root, left, right.

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