design·结合·模拟 模式

识别信号

• Check if the candidate tracks slot availability correctly for each car type.
• Observe whether addCar updates the internal state without overwriting counts.
• Looking for a clean approach to handle boundary conditions and direction changes.

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

• Mixing up car type indices leading to wrong counter updates.
• Not handling the boundary conditions properly, causing the robot to move out of bounds.