design plus simulation Pattern
Pattern hubs are for building transferable solving frames. Learn the recognition signals first, then drill state definition, update rules, and edge explanation until the pattern feels stable.
Pattern brief
Recognize first
Check if the candidate tracks slot availability correctly for each car type.
Solve rhythm
State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.
Most common miss
Mixing up car type indices leading to wrong counter updates.
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.
Recommended Ladder
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