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import sys class Solution(object): def isValidBST(self, root): """ :type root: TreeNode :rtype: bool """ def isBST(node, l, r): if node: return l < node.val < r and isBST(node.left, l, node.val) and isBST(node.right, node.val, r) return True return isBST(root, -sys.maxint, sys.maxint)
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