Checkpoint: Running average

Challenge on lesson: Checkpoint: One Transform, Whole Answer

CHALLENGE

Difficulty: intermediate+25 XP

Implement std::vector<double> running_avg(const std::vector<int>& v) where element i is the average of v[0..i]. One std::transform with a by-reference captured prefix sum must produce the whole output (no manual loop in main). The empty vector returns an empty vector.

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