From 7692d6cc97a999016aa0bd023433a2e0975e262d Mon Sep 17 00:00:00 2001
From: eeee0717 <chentao020717Work@outlook.com>
Date: Fri, 8 Dec 2023 08:08:10 +0800
Subject: [PATCH] =?UTF-8?q?Update=200669.=E4=BF=AE=E5=89=AA=E4=BA=8C?=
 =?UTF-8?q?=E5=8F=89=E6=90=9C=E7=B4=A2=E6=A0=91=EF=BC=8C=E6=B7=BB=E5=8A=A0?=
 =?UTF-8?q?C#?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0669.修剪二叉搜索树.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/problems/0669.修剪二叉搜索树.md b/problems/0669.修剪二叉搜索树.md
index 00186558..229a2ab1 100644
--- a/problems/0669.修剪二叉搜索树.md
+++ b/problems/0669.修剪二叉搜索树.md
@@ -567,6 +567,23 @@ impl Solution {
     }
 }
 ```
+### C#
+```C#
+// 递归
+public TreeNode TrimBST(TreeNode root, int low, int high)
+{
+    if (root == null) return null;
+    if (root.val < low)
+        return TrimBST(root.right, low, high);
+
+    if (root.val > high)
+        return TrimBST(root.left, low, high);
+
+    root.left = TrimBST(root.left, low, high);
+    root.right = TrimBST(root.right, low, high);
+    return root;
+}
+```
 
 
 <p align="center">