drop duplicate rows 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
- The candidate demonstrates proficiency with pandas functions.
- They understand how to manipulate dataframes effectively for cleaning tasks.
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
- Forgetting to specify the `subset` argument in `drop_duplicates()` may result in duplicates being removed from all columns, not just the email column.