LeetCode(94)Binary Tree Inorder Traversal
题目如下:

Python代码:
def inorderTraversal(self, root):
res = []
self.helper(root, res)
return res def helper(self, root, res):
if root:
self.helper(root.left, res)
res.append(root.val)
self.helper(root.right, res)
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