Intervals - Meeting Rooms I
Given the sorted intervals [[1,4],[5,8],[9,12]] and the overlap check returns True, which of the following could be the original input intervals before sorting?
Given the sorted intervals [[1,4],[5,8],[9,12]] and the overlap check returns True, which of the following could be the original input intervals before sorting?
hard🔄 Reverse Engineer Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Check if intervals overlap
Sorted intervals have no overlaps: 4 ≤ 5 and 8 ≤ 9.Step 2: Identify original input matching sorted order
Only [[1,4],[5,8],[9,12]] matches sorted intervals exactly, others have overlaps or different order.Final Answer:
Option D -> Option DQuick Check:
Original input matches sorted non-overlapping intervals [OK]
Quick Trick: Original input must sort to given intervals [OK]
Common Mistakes:
MISTAKES- Picking inputs that cause overlaps
- Ignoring sorting effect
Trap Explanation:
PITFALL- Candidates may pick inputs that do not sort to given intervals or cause overlaps.
Interviewer Note:
CONTEXT- Tests reasoning backwards from output to input.
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