message: Update binary-tree-longest-consecutive-sequence-ii.py
diff: @@ -16,7 +16,7 @@ class Solution(object):
  """
  def longestConsecutiveHelper(root):
  if not root:
  - return 0
  + return 0, 0
  left_len = longestConsecutiveHelper(root.left)
  right_len = longestConsecutiveHelper(root.right)
  cur_inc_len, cur_dec_len = 1, 1
  