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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

Accepted

4.4k/5.8k

Acceptance Rate75.5%

Test Cases

Input

Output

Expected