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Update 0098.验证二叉搜索树，添加C#版

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2023-11-28 10:17:25 +08:00
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problems/0098.验证二叉搜索树.md
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@ -791,6 +791,20 @@ impl Solution {
}
}
```
### C#
```C#
// 递归
public long val = Int64.MinValue;
public bool IsValidBST(TreeNode root)
{
if (root == null) return true;
bool left = IsValidBST(root.left);
if (root.val > val) val = root.val;
else return false;
bool right = IsValidBST(root.right);
return left && right;
}
```
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