From eb76f57a19e813e77490931d97787a4d8b4a0552 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+fwqaaq@users.noreply.github.com>
Date: Mon, 5 Dec 2022 22:55:08 +0800
Subject: [PATCH] =?UTF-8?q?Update=200701.=E4=BA=8C=E5=8F=89=E6=90=9C?=
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 =?UTF-8?q?=E4=BD=9C.md?=
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---
 .../0701.二叉搜索树中的插入操作.md | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/problems/0701.二叉搜索树中的插入操作.md b/problems/0701.二叉搜索树中的插入操作.md
index b8d53b04..559c3900 100644
--- a/problems/0701.二叉搜索树中的插入操作.md
+++ b/problems/0701.二叉搜索树中的插入操作.md
@@ -677,6 +677,30 @@ impl Solution {
 }
 ```
 
+递归：
+
+```rust
+impl Solution {
+    pub fn insert_into_bst(
+        root: Option<Rc<RefCell<TreeNode>>>,
+        val: i32,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        if let Some(node) = &root {
+            if node.borrow().val > val {
+                let left = Self::insert_into_bst(node.borrow_mut().left.take(), val);
+                node.borrow_mut().left = left;
+            } else {
+                let right = Self::insert_into_bst(node.borrow_mut().right.take(), val);
+                node.borrow_mut().right = right;
+            }
+            root
+        } else {
+            Some(Rc::new(RefCell::new(TreeNode::new(val))))
+        }
+    }
+}
+```
+
 
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">