array plus segment tree Pattern
4 problems
Pattern pages help build reusable solving frames. Identify signals first, then explain state, transition, and edge handling.
Recognition Signals
- Check if candidates handle very large X coordinates efficiently.
- Look for proper use of range maximum queries using a segment tree or ordered set.
- Candidate demonstrates understanding of the Line Sweep technique.
Solve Flow
- 1. Define the active state/window.
- 2. Update state while preserving invariants.
- 3. Validate with edge-heavy examples.
Common Misses
- Failing to compress coordinates, causing memory overflow for large lefti values.
- Misunderstanding the use of the Segment Tree and treating each rectangle independently.
- Updating nums1 naively for every flip causes TLE on large inputs.
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