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Update 0106.添加C#版

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`@@ -1228,6 +1228,19 @@ impl Solution {`
`1228`	`1228`	`}`
`1229`	`1229`	`}`
`1230`	`1230`	```
	`1231`	`+### C#`
	`1232`	+```C#
	`1233`	`+public TreeNode BuildTree(int[] inorder, int[] postorder)`
	`1234`	`+{`
	`1235`	`+ if (inorder.Length == 0 \|\| postorder.Length == null) return null;`
	`1236`	`+ int rootValue = postorder.Last();`
	`1237`	`+ TreeNode root = new TreeNode(rootValue);`
	`1238`	`+ int delimiterIndex = Array.IndexOf(inorder, rootValue);`
	`1239`	`+ root.left = BuildTree(inorder.Take(delimiterIndex).ToArray(), postorder.Take(delimiterIndex).ToArray());`
	`1240`	`+ root.right = BuildTree(inorder.Skip(delimiterIndex + 1).ToArray(), postorder.Skip(delimiterIndex).Take(inorder.Length - delimiterIndex - 1).ToArray());`
	`1241`	`+ return root;`
	`1242`	`+}`
	`1243`	+```
`1231`	`1244`
`1232`	`1245`	`<p align="center">`
`1233`	`1246`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`

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