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Which of the following problems CANNOT be efficiently solved using the Interval List Intersections pattern?

easy🔍 Pattern Recognition Q2 of Q15
Intervals - Interval List Intersections
Which of the following problems CANNOT be efficiently solved using the Interval List Intersections pattern?
AFinding overlapping intervals between two sorted, non-overlapping interval lists
BFinding the maximum number of overlapping intervals at any point in a single list
CFinding all intervals where two sorted lists overlap
DMerging two sorted lists of intervals into one sorted list without overlaps
Step-by-Step Solution
Solution:

  1. Step 1: Analyze each problem

    Options A, B, and D involve two sorted interval lists and overlap or merge operations suitable for interval intersection patterns.

  2. Step 2: Identify anti-pattern

    Finding the maximum number of overlapping intervals at any point in a single list requires counting maximum overlaps in a single list, which is a sweep line or segment tree problem, not interval intersections between two lists.

  3. Final Answer:

    Option C -> Option C

  4. Quick Check:

    Finding the maximum number of overlapping intervals at any point in a single list is the anti-pattern, so answer is D (the question asks which CANNOT be solved by the pattern) [OK]
Quick Trick: Max overlaps in one list ≠ interval intersections [OK]
Common Mistakes:
MISTAKES
  • Confusing max overlap with interval intersection
Trap Explanation:
PITFALL
  • Candidates often think all interval problems fit the pattern, missing that max overlap needs different approach.
Interviewer Note:
CONTEXT
  • Tests anti-pattern recognition and understanding of problem boundaries.
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