Recall & Review
beginner
What is the inorder successor of a node in a Binary Search Tree (BST)?
The inorder successor of a node in a BST is the node with the smallest key greater than the given node's key. It is the next node visited in an inorder traversal.
Click to reveal answer
beginner
How do you find the inorder successor if the node has a right child?
If the node has a right child, the inorder successor is the leftmost node in the right subtree.
Click to reveal answer
intermediate
How do you find the inorder successor if the node has no right child?
If the node has no right child, the inorder successor is one of its ancestors. It is the lowest ancestor whose left child is also an ancestor of the node.
Click to reveal answer
beginner
What is the inorder traversal order of a BST?
Inorder traversal visits nodes in ascending order: left subtree, current node, then right subtree.
Click to reveal answer
intermediate
Why is the inorder successor important in BST operations?
The inorder successor helps in operations like deletion of a node, finding next higher value, and range queries by providing the next node in sorted order.
Click to reveal answer
What is the inorder successor of a node with a right subtree?
✗ Incorrect
If a node has a right child, its inorder successor is the leftmost node in that right subtree.
If a node has no right child, how do you find its inorder successor?
✗ Incorrect
When no right child exists, the inorder successor is the lowest ancestor where the node lies in its left subtree.
What traversal order does inorder traversal follow in a BST?
✗ Incorrect
Inorder traversal visits nodes in ascending order: left subtree, current node, then right subtree.
Which of these is NOT a use of inorder successor in BST?
✗ Incorrect
Inorder successor is not used for balancing the BST; balancing uses rotations or other methods.
If a node is the maximum node in a BST, what is its inorder successor?
✗ Incorrect
The maximum node has no inorder successor because no node has a greater key.
Explain how to find the inorder successor of a node in a BST when it has a right child and when it does not.
Think about the next bigger value in sorted order.
You got /2 concepts.
Describe why inorder traversal of a BST visits nodes in ascending order and how this relates to finding the inorder successor.
Consider how BST properties and traversal order connect.
You got /3 concepts.