string·结合·计数 模式

识别信号

• Check for simultaneous overlapping croaks to assess string plus counting comprehension.
• Look for proper validation of sequence order to detect partial or invalid croaks.
• The candidate correctly splits the string into two halves without index errors.

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

• Failing to track multiple frogs simultaneously, leading to undercounting.
• Forgetting to include uppercase vowels in the count.
• Replacing underscores inconsistently reduces maximum distance.