array 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
Focus on handling overlapping poison durations correctly.
Solve rhythm
State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.
Most common miss
Double-counting seconds when poison durations overlap.
Recognition signals
- Focus on handling overlapping poison durations correctly.
- Check if candidates use linear iteration instead of nested loops.
- Look for an approach that avoids recomputing the sum after each query.
Solve flow
- 1. Define the active state/window.
- 2. Update state while preserving invariants.
- 3. Validate with edge-heavy examples.
Common misses
- Double-counting seconds when poison durations overlap.
- Recomputing the sum of even numbers from scratch after each query, causing TLE.
- Overwriting elements instead of shifting them during insertion.
Recommended Ladder
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