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Update0235.二叉搜索树的最近公共祖先,添加C#

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`@@ -513,6 +513,31 @@ impl Solution {`
`513`	`513`	`}`
`514`	`514`	`}`
`515`	`515`	```
	`516`	`+### C#`
	`517`	+```C#
	`518`	`+// 递归`
	`519`	`+public TreeNode LowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q)`
	`520`	`+{`
	`521`	`+ if (root.val > p.val && root.val > q.val)`
	`522`	`+ return LowestCommonAncestor(root.left, p, q);`
	`523`	`+ if (root.val < p.val && root.val < q.val)`
	`524`	`+ return LowestCommonAncestor(root.right, p, q);`
	`525`	`+ return root;`
	`526`	`+}`
	`527`	`+// 迭代`
	`528`	`+public TreeNode LowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q)`
	`529`	`+{`
	`530`	`+ while (root != null)`
	`531`	`+ {`
	`532`	`+ if (root.val > p.val && root.val > q.val)`
	`533`	`+ root = root.left;`
	`534`	`+ else if (root.val < p.val && root.val < q.val)`
	`535`	`+ root = root.right;`
	`536`	`+ else return root;`
	`537`	`+ }`
	`538`	`+ return null;`
	`539`	`+}`
	`540`	+```
`516`	`541`
`517`	`542`
`518`	`543`	`<p align="center">`

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