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Update 0098.验证二叉搜索树,添加C#版

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`@@ -791,6 +791,20 @@ impl Solution {`
`791`	`791`	`}`
`792`	`792`	`}`
`793`	`793`	```
	`794`	`+### C#`
	`795`	+```C#
	`796`	`+// 递归`
	`797`	`+public long val = Int64.MinValue;`
	`798`	`+public bool IsValidBST(TreeNode root)`
	`799`	`+{`
	`800`	`+ if (root == null) return true;`
	`801`	`+ bool left = IsValidBST(root.left);`
	`802`	`+ if (root.val > val) val = root.val;`
	`803`	`+ else return false;`
	`804`	`+ bool right = IsValidBST(root.right);`
	`805`	`+ return left && right;`
	`806`	`+}`
	`807`	+```
`794`	`808`
`795`	`809`	`<p align="center">`
`796`	`810`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`

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