查找·students·study·spiral·pattern·core·interview·pattern 模式
1 道题目
模式页适合用来建立可复用解题框架。先识别题目特征，再按固定流程解释状态定义、转移和边界。
识别信号
- They emphasize ordered sessions, which signals this is a timeline validation problem rather than a plain COUNT and GROUP BY task.
- They use rotating cycle language, which hints that modular positions or repeated offsets matter more than local pairwise comparisons.
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
- Checking only consecutive subject changes and missing that a later row breaks the claimed cycle.