box_array_pick_number

a = [[1,2,4,5],[6,7,8,9],[10,11,12,13],[14,15,16,17]]
number = 17
def box_arr_num(a, number)
  length = a.length-1
  number = number
  (0..a.length).each do |i|
    if a[i][a.length-1] >= number
      (0..a.length).each do |j|
        if a[i][j] == number
            return i, j
        end
      end
    end
  end
end
print box_arr_num(a, number)