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Update 0112.路径总和.md

增加112-python-简洁版解法

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Original file line number	Diff line number	Diff line change
`@@ -475,6 +475,12 @@ class solution:`
`475`	`475`	`return false # 别忘记处理空treenode`
`476`	`476`	`else:`
`477`	`477`	`return isornot(root, targetsum - root.val)`
	`478`	`+`
	`479`	`+class Solution: # 简洁版`
	`480`	`+ def hasPathSum(self, root: Optional[TreeNode], targetSum: int) -> bool:`
	`481`	`+ if not root: return False`
	`482`	`+ if root.left==root.right==None and root.val == targetSum: return True`
	`483`	`+ return self.hasPathSum(root.left,targetSum-root.val) or self.hasPathSum(root.right,targetSum-root.val)`
`478`	`484`	```
`479`	`485`
`480`	`486`	`迭代 - 层序遍历`

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