design plus simulation Pattern
2 problems
Pattern pages help build reusable solving frames. Identify signals first, then explain state, transition, and edge handling.
Recognition Signals
- 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.
Solve Flow
- 1. Define the active state/window.
- 2. Update state while preserving invariants.
- 3. Validate with edge-heavy examples.
Common Misses
- Mixing up car type indices leading to wrong counter updates.
- Not handling the boundary conditions properly, causing the robot to move out of bounds.
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