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add recursive solution

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Original file line number	Diff line number	Diff line change
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	`1`	`+# Definition for a binary tree node.`
	`2`	`+# class TreeNode(object):`
	`3`	`+# def __init__(self, x):`
	`4`	`+# self.val = x`
	`5`	`+# self.left = None`
	`6`	`+# self.right = None`
	`7`	`+`
	`8`	`+class Solution(object):`
	`9`	`+ def inorderTraversal(self, root):`
	`10`	`+ res = []`
	`11`	`+ self.inOrder(root, res)`
	`12`	`+ return res`
	`13`	`+`
	`14`	`+ def inOrder(self, root, res):`
	`15`	`+ if root:`
	`16`	`+ self.inOrder(root.left, res)`
	`17`	`+ res.append(root.val)`
	`18`	`+ self.inOrder(root.right, res)`

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