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Answers and rating deltas for
Whats the efficient way to sum up the elements of an array in following way?
| Author | Votes | Δ |
|---|---|---|
| gudok | 4 | +3.89 |
| fjardon | 3 | +0.51 |
| gnasher729 | 0 | -0.58 |
| Ke Yang | 0 | -2.66 |
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