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Simplify the declarations of the Python code.
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@ -26,7 +26,7 @@ class BinarySearchTree:
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return None
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# 将数组中间节点作为根节点
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mid: int = (start_index + end_index) // 2
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mid = (start_index + end_index) // 2
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root = TreeNode(nums[mid])
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# 递归建立左子树和右子树
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root.left = self.build_tree(
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