识别信号
- Look for understanding of iterator design patterns and the need for efficient caching.
- Test the candidate's ability to handle edge cases like empty or fully traversed iterators.
- Can the candidate suggest a more efficient solution than brute force?
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 properly cache the next element, leading to incorrect results from peek().
- Not recognizing that a brute force solution may be too slow for large inputs.
- Trying to expand the full sequence causing memory issues.
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