From 43275d8e9cf593839bb505353f79e42c3cba7bb7 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Tue, 15 Nov 2022 20:51:03 +0800
Subject: [PATCH] =?UTF-8?q?Update=200222.=E5=AE=8C=E5=85=A8=E4=BA=8C?=
 =?UTF-8?q?=E5=8F=89=E6=A0=91=E7=9A=84=E8=8A=82=E7=82=B9=E4=B8=AA=E6=95=B0?=
 =?UTF-8?q?.md?=
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---
 problems/0222.完全二叉树的节点个数.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/problems/0222.完全二叉树的节点个数.md b/problems/0222.完全二叉树的节点个数.md
index 6754864d..bfb9ac0f 100644
--- a/problems/0222.完全二叉树的节点个数.md
+++ b/problems/0222.完全二叉树的节点个数.md
@@ -797,6 +797,23 @@ object Solution {
 }
 ```
 
+rust:
+
+// 递归
+```rust
+use std::cell::RefCell;
+use std::rc::Rc;
+impl Solution {
+    pub fn count_nodes(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
+        if root.is_none() {
+            return 0;
+        }
+        1 + Self::count_nodes(Rc::clone(root.as_ref().unwrap()).borrow().left.clone())
+            + Self::count_nodes(root.unwrap().borrow().right.clone())
+    }
+}
+```
+
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