识别信号
- 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.
解题流程
- 1. 明确窗口/状态定义
- 2. 更新状态并维护约束
- 3. 用边界样例验证
常见失分点
- 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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