text: # Definition for a binary tree node.
  # class TreeNode(object):
  #     def __init__(self, x):
  #         self.val = x
  #         self.left = None
  #         self.right = None
  
  class Solution(object):
      def findSecondMinimumValue(self, root):
          """
          :type root: TreeNode
          :rtype: int
          """
  
  