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update538.把二叉搜索树转换为累加树,添加C#

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Original file line number	Diff line number	Diff line change
`@@ -529,6 +529,23 @@ impl Solution {`
`529`	`529`	`}`
`530`	`530`	`}`
`531`	`531`	```
	`532`	`+### C#`
	`533`	+```C#
	`534`	`+// 递归`
	`535`	`+public class Solution`
	`536`	`+{`
	`537`	`+ int pre = 0;`
	`538`	`+ public TreeNode ConvertBST(TreeNode root)`
	`539`	`+ {`
	`540`	`+ if (root == null) return null;`
	`541`	`+ ConvertBST(root.right);`
	`542`	`+ root.val += pre;`
	`543`	`+ pre = root.val;`
	`544`	`+ ConvertBST(root.left);`
	`545`	`+ return root;`
	`546`	`+ }`
	`547`	`+}`
	`548`	+```
`532`	`549`
`533`	`550`
`534`	`551`	`<p align="center">`

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