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Which of the following problems CANNOT be solved by finding all root-to-leaf paths with a given sum in a binary tree?

easy🔍 Pattern Recognition Q2 of Q15
Tree: Depth-First Search - Path Sum II (All Root-to-Leaf Paths)
Which of the following problems CANNOT be solved by finding all root-to-leaf paths with a given sum in a binary tree?
AFind all root-to-leaf paths where the sum equals a target value.
BReturn all root-to-leaf paths where the sum is less than or equal to a target.
CFind the maximum sum path from root to any node (not necessarily leaf).
DFind if there exists any root-to-leaf path with sum equal to target.
Step-by-Step Solution
Solution:

  1. Step 1: Analyze problem requirements

    Finding maximum sum path to any node does not require all root-to-leaf paths, and includes non-leaf nodes.

  2. Step 2: Compare with path sum II pattern

    Path Sum II requires root-to-leaf paths; maximum sum to any node breaks this pattern.

  3. Final Answer:

    Option C → Option C

  4. Quick Check:

    Maximum sum to any node is a different pattern than all root-to-leaf paths [OK]
Quick Trick: Max sum to any node ≠ all root-to-leaf paths [OK]
Common Mistakes:
MISTAKES
  • Confusing existence check with enumeration
  • Assuming partial paths count as root-to-leaf
Trap Explanation:
PITFALL
  • Candidates often think all path sum problems are the same, missing that max sum to any node is a different pattern.
Interviewer Note:
CONTEXT
  • Tests anti-pattern recognition and problem classification skills.
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