Recall & Review
beginner
What does it mean to mirror a binary tree?
Mirroring a binary tree means swapping the left and right children of every node in the tree, creating a reversed version of the original tree.
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intermediate
Which traversal method is commonly used to mirror a binary tree?
A post-order traversal is commonly used because it processes children before the parent, allowing safe swapping of left and right subtrees.
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beginner
What is the base case when writing a recursive function to mirror a binary tree?
The base case is when the current node is null (empty), meaning there is nothing to mirror, so the function returns immediately.
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beginner
Show the effect of mirroring on this tree: 1 -> left: 2, right: 3
After mirroring, the tree becomes: 1 -> left: 3, right: 2. The left and right children of the root are swapped.
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intermediate
Why is mirroring a binary tree useful in programming?
Mirroring helps understand tree symmetry, can be used in image processing, and is a common interview problem to practice recursion and tree manipulation.
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What happens to the left and right children of a node when mirroring a binary tree?
✗ Incorrect
Mirroring swaps the left and right children of every node.
What is the base case in a recursive mirror function for a binary tree?
✗ Incorrect
The recursion stops when the node is null, meaning no further nodes to process.
Which traversal order is best suited for mirroring a binary tree?
✗ Incorrect
Post-order traversal processes children before the parent, allowing safe swapping.
If a tree node has left child 4 and right child 5, what will be the children after mirroring?
✗ Incorrect
Mirroring swaps the left and right children.
Mirroring a binary tree is an example of which programming concept?
✗ Incorrect
Mirroring is typically done using recursion to process all nodes.
Explain how you would write a recursive function to mirror a binary tree.
Think about what happens at each node and when to stop.
You got /4 concepts.
Describe the changes in the tree structure after mirroring a binary tree.
Imagine flipping the tree sideways.
You got /3 concepts.