Recover the BST Test
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Questions and Answers

What is the defining property of a Binary Search Tree (BST)?

  • All nodes in the left subtree have values less than the root node, and all nodes in the right subtree have values greater than the root node. (correct)
  • Each node has a unique value.
  • All nodes have at most two children, a left child and a right child.
  • The tree is always perfectly balanced.

    • What is the purpose of recovering a corrupted Binary Search Tree (BST)?

  • To add new nodes to the tree while maintaining the BST property.
  • To restore the tree's structure by identifying and correcting two misplaced nodes that violate the BST property. (correct)
  • To convert the BST into a different type of binary tree.
  • To ensure the tree is perfectly balanced.

    • In the example BST provided, which node would be considered the root node?

  • 3
  • 5
  • 15
  • 10 (correct)

    • Which of the following is not a characteristic of a standard Binary Search Tree (BST)?

    <p>Each node has a unique value.</p> Signup and view all the answers

    What is the main approach mentioned for recovering a corrupted Binary Search Tree (BST)?

    <p>Inorder traversal and two-pointer approach.</p> Signup and view all the answers

    What is the time complexity of the inorder traversal and two-pointer approach for recovering a BST?

    <p>O(n)</p> Signup and view all the answers

    What is the purpose of the prevNode variable in the inorder method?

    <p>To keep track of the previous node during the inorder traversal</p> Signup and view all the answers

    In the inorder method, how are the firstIncorrectNode and secondIncorrectNode variables determined?

    <p>By comparing the values of the current node and the previous node</p> Signup and view all the answers

    What is the space complexity of the inorder traversal and two-pointer approach for recovering a BST?

    <p>O(h), where h is the height of the tree</p> Signup and view all the answers

    In the recoverTree method, what operation is performed after identifying the two incorrectly placed nodes?

    <p>The values of the two nodes are swapped</p> Signup and view all the answers

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