Prototype: implement prototype(long[] loads) returning Scan with a direct baseline.

Final: implement solve(long[] loads) with the mechanism and bounds described above. Return Scan(total, firstMaximumIndex). Loads are nonnegative. Empty input gives Scan(0, null); [8,2,8] gives Scan(18,0). Ties choose the first original index. Both stages have the same observable contract. The prototype may use the simpler method; final must use the target data structure.

The supplied nested record types define the API. All methods are static members of Exercise.

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