From 3b3ed756664435b73fceb20a971fa8ef03d608f8 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Sat, 26 Nov 2022 15:16:06 +0800
Subject: [PATCH 1/4] =?UTF-8?q?Update=200617.=E5=90=88=E5=B9=B6=E4=BA=8C?=
 =?UTF-8?q?=E5=8F=89=E6=A0=91.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0617.合并二叉树.md | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/problems/0617.合并二叉树.md b/problems/0617.合并二叉树.md
index db2d3762..f0ecf79b 100644
--- a/problems/0617.合并二叉树.md
+++ b/problems/0617.合并二叉树.md
@@ -691,6 +691,35 @@ object Solution {
 }
 ```
 
+### rust
+
+递归：
+
+```rust
+use std::cell::RefCell;
+use std::rc::Rc;
+impl Solution {
+    pub fn merge_trees(
+        root1: Option<Rc<RefCell<TreeNode>>>,
+        root2: Option<Rc<RefCell<TreeNode>>>,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        if root1.is_none() {
+            return root2;
+        }
+        if root2.is_none() {
+            return root1;
+        }
+        let binding = root1.clone();
+        let mut node1 = binding.as_ref().unwrap().borrow_mut();
+        let node2 = root2.as_ref().unwrap().borrow_mut();
+        node1.left = Self::merge_trees(node1.left.clone(), node2.left.clone());
+        node1.right = Self::merge_trees(node1.right.clone(), node2.right.clone());
+        node1.val += node2.val;
+
+        root1
+    }
+}
+```
 
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">

From ae99d647ac6f662a9a97340511c07e541c2f257a Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Sat, 26 Nov 2022 16:41:16 +0800
Subject: [PATCH 2/4] =?UTF-8?q?Update=200617.=E5=90=88=E5=B9=B6=E4=BA=8C?=
 =?UTF-8?q?=E5=8F=89=E6=A0=91.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0617.合并二叉树.md | 43 ++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/problems/0617.合并二叉树.md b/problems/0617.合并二叉树.md
index f0ecf79b..9fe457c6 100644
--- a/problems/0617.合并二叉树.md
+++ b/problems/0617.合并二叉树.md
@@ -721,6 +721,49 @@ impl Solution {
 }
 ```
 
+迭代：
+
+```rust
+impl Solution {
+    pub fn merge_trees(
+        root1: Option<Rc<RefCell<TreeNode>>>,
+        root2: Option<Rc<RefCell<TreeNode>>>,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        if root1.is_none() {
+            return root2;
+        }
+        if root2.is_none() {
+            return root1;
+        }
+        let mut stack = vec![];
+        stack.push(root2);
+        stack.push(root1.clone());
+        while !stack.is_empty() {
+            let node1 = stack.pop().unwrap().unwrap();
+            let node2 = stack.pop().unwrap().unwrap();
+            let mut node1 = node1.borrow_mut();
+            let node2 = node2.borrow();
+            node1.val += node2.val;
+            if node1.left.is_some() && node2.left.is_some() {
+                stack.push(node2.left.clone());
+                stack.push(node1.left.clone());
+            }
+            if node1.right.is_some() && node2.right.is_some() {
+                stack.push(node2.right.clone());
+                stack.push(node1.right.clone());
+            }
+            if node1.left.is_none() && node2.left.is_some() {
+                node1.left = node2.left.clone();
+            }
+            if node1.right.is_none() && node2.right.is_some() {
+                node1.right = node2.right.clone();
+            }
+        }
+        root1
+    }
+}
+```
+
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>

From 5c4b8b3d8140ecc67f917f49899d77ee49f9b83d Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Sat, 26 Nov 2022 18:07:46 +0800
Subject: [PATCH 3/4] =?UTF-8?q?Update=200700.=E4=BA=8C=E5=8F=89=E6=90=9C?=
 =?UTF-8?q?=E7=B4=A2=E6=A0=91=E4=B8=AD=E7=9A=84=E6=90=9C=E7=B4=A2.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0700.二叉搜索树中的搜索.md | 27 ++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/problems/0700.二叉搜索树中的搜索.md b/problems/0700.二叉搜索树中的搜索.md
index 2ee2bdb0..a0143bd8 100644
--- a/problems/0700.二叉搜索树中的搜索.md
+++ b/problems/0700.二叉搜索树中的搜索.md
@@ -414,6 +414,33 @@ object Solution {
 }
 ```
 
+### rust
+
+递归：
+
+```rust
+use std::cell::RefCell;
+use std::rc::Rc;
+impl Solution {
+    pub fn search_bst(
+        root: Option<Rc<RefCell<TreeNode>>>,
+        val: i32,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        if root.is_none() || root.as_ref().unwrap().borrow().val == val {
+            return root;
+        }
+        let node_val = root.as_ref().unwrap().borrow().val;
+        if node_val > val {
+            return Self::search_bst(root.as_ref().unwrap().borrow().left.clone(), val);
+        }
+        if node_val < val {
+            return Self::search_bst(root.unwrap().borrow().right.clone(), val);
+        }
+        None
+    }
+}
+```
+
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>

From 4be111b3d170b7f3ff5888d0cb343368818e4fd2 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Sat, 26 Nov 2022 18:25:55 +0800
Subject: [PATCH 4/4] =?UTF-8?q?Update=200700.=E4=BA=8C=E5=8F=89=E6=90=9C?=
 =?UTF-8?q?=E7=B4=A2=E6=A0=91=E4=B8=AD=E7=9A=84=E6=90=9C=E7=B4=A2.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0700.二叉搜索树中的搜索.md | 23 ++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/problems/0700.二叉搜索树中的搜索.md b/problems/0700.二叉搜索树中的搜索.md
index a0143bd8..c09f11b9 100644
--- a/problems/0700.二叉搜索树中的搜索.md
+++ b/problems/0700.二叉搜索树中的搜索.md
@@ -441,6 +441,29 @@ impl Solution {
 }
 ```
 
+迭代：
+
+```rust
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::cmp;
+impl Solution {
+    pub fn search_bst(
+        mut root: Option<Rc<RefCell<TreeNode>>>,
+        val: i32,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        while let Some(ref node) = root.clone() {
+            match val.cmp(&node.borrow().val) {
+                cmp::Ordering::Less => root = node.borrow().left.clone(),
+                cmp::Ordering::Equal => return root,
+                cmp::Ordering::Greater => root = node.borrow().right.clone(),
+            };
+        }
+        None
+    }
+}
+```
+
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>