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Rippling
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Quick Summary
Track driver profiles and their associated hourly pay rates.
Calculate delivery costs by converting duration from seconds to hours and applying the driver's rate.
Maintain a running global total to support instant cost queries.
What This Tests
Efficient state management using hash maps
Unit conversion and arithmetic precision
Incremental accumulation for O(1) read operations
Handling floating point arithmetic correctly
Common Patterns
Hashing
Prefix Sum
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