Intervals - Remove Covered Intervals
Given the sorted intervals [[1,5],[2,4],[3,6],[7,8]] and the final count of uncovered intervals is 3, which interval was covered?
Given the sorted intervals [[1,5],[2,4],[3,6],[7,8]] and the final count of uncovered intervals is 3, which interval was covered?
hard🔄 Reverse Engineer Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze coverage
Interval [2,4] is fully contained within [1,5].Step 2: Check others
[3,6] extends beyond [1,5], so not covered; [7,8] is separate.Step 3: Confirm count
3 uncovered intervals means one covered, which is [2,4].Final Answer:
Option D -> Option DQuick Check:
Only [2,4] is covered by [1,5] [OK]
Quick Trick: Covered intervals lie fully inside another interval [OK]
Common Mistakes:
MISTAKES- Confusing overlap with coverage
- Picking intervals that partially overlap
Trap Explanation:
PITFALL- Candidates often mistake partial overlap for coverage.
Interviewer Note:
CONTEXT- Tests reverse reasoning from output to input intervals.
Master "Remove Covered Intervals" in Intervals
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