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Which of the following problems CANNOT be solved using the Lowest Common Ancestor (LCA) pattern in a binary tree?

easy🔍 Pattern Recognition Q2 of Q15
Tree: Depth-First Search - Lowest Common Ancestor of Binary Tree
Which of the following problems CANNOT be solved using the Lowest Common Ancestor (LCA) pattern in a binary tree?
AFinding the intersection node of two singly linked lists
BDetermining if one node is a descendant of another in a tree
CFinding the common ancestor of two nodes in a binary tree
DFinding the lowest node that is ancestor to two given nodes
Step-by-Step Solution
Solution:

  1. Step 1: Analyze problem types

    Options B, C, and D relate to tree ancestor-descendant relationships solvable by LCA or simple traversal.

  2. Step 2: Identify non-tree problem

    Finding the intersection node of two singly linked lists is about linked lists intersection, which is not a tree problem and requires different algorithms.

  3. Final Answer:

    Option A -> Option A

  4. Quick Check:

    Linked list intersection ≠ LCA problem [OK]
Quick Trick: LCA applies only to tree ancestor problems [OK]
Common Mistakes:
MISTAKES
  • Assuming LCA applies to all intersection problems
Trap Explanation:
PITFALL
  • Candidates confuse intersection in linked lists with LCA in trees.
Interviewer Note:
CONTEXT
  • Tests anti-pattern recognition and problem classification
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