From 97367686282a330d87790a72c8d04e57c0354a38 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+fwqaaq@users.noreply.github.com>
Date: Fri, 9 Dec 2022 00:20:13 +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.md?=
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---
 problems/0669.修剪二叉搜索树.md | 27 ++++++++++++++++++++++++++
 1 file changed, 27 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 c2d7b79b..1cc958c8 100644
--- a/problems/0669.修剪二叉搜索树.md
+++ b/problems/0669.修剪二叉搜索树.md
@@ -469,6 +469,33 @@ object Solution {
 }
 ```
 
+## rust
+
+// 递归
+```rust
+impl Solution {
+    pub fn trim_bst(
+        root: Option<Rc<RefCell<TreeNode>>>,
+        low: i32,
+        high: i32,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        root.as_ref()?;
+        let mut node = root.as_ref().unwrap().borrow_mut();
+        if node.val < low {
+            return Self::trim_bst(node.right.clone(), low, high);
+        }
+        if node.val > high {
+            return Self::trim_bst(node.left.clone(), low, high);
+        }
+
+        node.left = Self::trim_bst(node.left.clone(), low, high);
+        node.right = Self::trim_bst(node.right.clone(), low, high);
+        drop(node);
+        root
+    }
+}
+```
+
 
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">