数组·reduce·transformation·core·interview·pattern 模式

识别信号

• Look for understanding of sequential operations and the effect of passing intermediate results to the reducer function.
• Test if the candidate accounts for edge cases like empty arrays properly.

解题流程

1. 1. 明确窗口/状态定义
2. 2. 更新状态并维护约束
3. 3. 用边界样例验证

常见失分点

• Forgetting to handle empty arrays and returning the correct initial value.