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Algorithm. Division for negative numbers.

Input:	a negative integer a and a natural number b
Output:	Two integers q and r such that a=(q ⋅ b) + r and 0 ≤ r < b

1. let q := 0
2. let r := a
3. repeat
   1. let q := q + 1
   2. let r := r + b
4. until r ≥ 0
5. return q,r