abs(i % j) < abs(j), i % j < i0, i0 + abs(j) ≤ 1 ⊦ j = 0
i % j < i0, i0 + abs(j) ≤ 1 ⊦ abs(i % j) < abs(j), j = 0
Used formulas: abs(i % j) < abs(j)