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Several bug fixes.
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@@ -8,7 +8,7 @@
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class TreeNode:
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"""二叉树节点类"""
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def __init__(self, val: int):
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self.val: int = val # 节点值
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self.val: int = val # 节点值
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self.left: TreeNode | None = None # 左子节点引用
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self.right: TreeNode | None = None # 右子节点引用
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```
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