方法1
class Solution:def inorderTraversal(self, root: TreeNode) -> List[int]:res = []def help(root: TreeNode):if(root is None):return Nonehelp(root.left)res.append(root.val)help(root.right)help(root)return res
方法2
class Solution:def inorderTraversal(self, root: TreeNode) -> List[int]:global resres = []self.help(root)return resdef help(self,root):if(root is None):return Noneself.help(root.left)res.append(root.val)self.help(root.right)
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