find stores with inventory imbalance core interview pattern 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
They want you to recognize a per-group boundary comparison, not a global cheapest-versus-expensive check.
Solve rhythm
State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.
Most common miss
Comparing the minimum quantity and maximum quantity instead of the quantity attached to the minimum and maximum price.
Recognition signals
- They want you to recognize a per-group boundary comparison, not a global cheapest-versus-expensive check.
- They are testing whether you can preserve row-level quantity after aggregating price by store.
Solve flow
- 1. Define the active state/window.
- 2. Update state while preserving invariants.
- 3. Validate with edge-heavy examples.
Common misses
- Comparing the minimum quantity and maximum quantity instead of the quantity attached to the minimum and maximum price.
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