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Consider the same addNum method. What is the intervals list after adding numbers 5, 5, 5 in order?

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Intervals - Data Stream as Disjoint Intervals
Consider the same addNum method. What is the intervals list after adding numbers 5, 5, 5 in order?
A[]
B[[5, 7]]
C[[5, 5], [5, 5], [5, 5]]
D[[5, 5]]
Step-by-Step Solution
Solution:

  1. Step 1: Add first 5

    Intervals empty, intervals = [[5,5]]

  2. Step 2: Add second 5

    5 already covered by [5,5], no change

  3. Step 3: Add third 5

    Again covered, no change

  4. Final Answer:

    Option D -> Option D

  5. Quick Check:

    Duplicates ignored, intervals remain [[5,5]] [OK]
Quick Trick: Duplicates do not create new intervals [OK]
Common Mistakes:
MISTAKES
  • Inserting duplicates as new intervals
Trap Explanation:
PITFALL
  • Candidates often forget to check if val is already covered, causing duplicates.
Interviewer Note:
CONTEXT
  • Tests handling of duplicates and boundary conditions.
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