Bird
Raised Fist0

Which of the following problems CANNOT be solved by applying the 'Flatten Binary Tree to Linked List' pattern (in-place preorder traversal with pointer rewiring)?

easy🔍 Pattern Recognition Q2 of Q15
Tree: Depth-First Search - Flatten Binary Tree to Linked List
Which of the following problems CANNOT be solved by applying the 'Flatten Binary Tree to Linked List' pattern (in-place preorder traversal with pointer rewiring)?
AConvert a binary tree into a linked list following preorder traversal order
BFind the shortest path between two nodes in a binary tree
CFlatten a binary tree into a linked list using right pointers only
DSerialize a binary tree into a string using preorder traversal
Step-by-Step Solution
Solution:

  1. Step 1: Identify the problem nature

    Flattening transforms tree structure into a linear linked list preserving preorder order.

  2. Step 2: Check if shortest path problem fits flattening pattern

    Shortest path requires graph traversal and path tracking, not linearizing the tree structure.

  3. Final Answer:

    Option B -> Option B

  4. Quick Check:

    Shortest path ≠ flattening tree to linked list [OK]
Quick Trick: Shortest path needs path tracking, not flattening [OK]
Common Mistakes:
MISTAKES
  • Confusing traversal with transformation
  • Thinking flattening helps path queries
Trap Explanation:
PITFALL
  • Candidates often confuse traversal-based problems with structural transformation problems.
Interviewer Note:
CONTEXT
  • Tests candidate's ability to distinguish problem types and appropriate patterns.
Master "Flatten Binary Tree to Linked List" in Tree: Depth-First Search

3 interactive learning modes - each teaches the same concept differently

Try ItSolutionTrace

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions
More Tree: Depth-First Search Quizzes
Binary Tree Cameras - Binary Tree Cameras - Quiz 10hard Binary Tree Inorder Traversal - Binary Tree Inorder Traversal - Quiz 7medium Binary Tree Maximum Path Sum - Binary Tree Maximum Path Sum - Quiz 7medium Binary Tree Postorder Traversal - Binary Tree Postorder Traversal - Quiz 9hard Binary Tree Preorder Traversal - Binary Tree Preorder Traversal - Quiz 14medium Construct Tree from Inorder and Postorder - Construct Tree from Inorder and Postorder - Quiz 12easy House Robber III (On Tree) - House Robber III (On Tree) - Quiz 3easy House Robber III (On Tree) - House Robber III (On Tree) - Quiz 8hard Serialize and Deserialize Binary Tree - Serialize and Deserialize Binary Tree - Quiz 9hard Symmetric Tree (DFS Approach) - Symmetric Tree (DFS Approach) - Quiz 2easy