Function foo

    line 10
    FAILED to compute RF
      line 8
      max(0, (B - A)) + max(0, (B - A)) + max(0, (B - A)) + max(0, (B - A)) + max(0, (B - A)) + max(0, (B - A)) + max(0, (B - A)) + max(0, (B - A))
      O(n)