message: Update single-number-ii.py
diff: @@ -13,6 +13,7 @@ class Solution(object):
  one, two = (~x & one) | (x & ~one & ~two), (~x & two) | (x & one)
  return one
  +
  class Solution2(object):
  # @param A, a list of integer
  # @return an integer
  