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Merge intervals. Merge all overlapping intervals and return the result. Input: [[1,3],[2,6],[8,10]]
Answer
Sort by start, then sweep once: O(n log n).
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Examples
On screen: Merge overlapping intervals.
Answer
Sort by start, then sweep once: O(n log n).
On screen: Market sizing, three segments.
Answer
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On screen: Monthly churn, 12 months.
Answer
Churn peaks in month 3. Start with onboarding.
On screen: A system design sketch.
Answer
The single database is the bottleneck. Add a cache first.
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