From 8d04e8a3804b1dd7538104cb9953451109256976 Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Mon, 28 Nov 2022 17:08:58 +0800
Subject: [PATCH 1/2] =?UTF-8?q?Update=200098.=E9=AA=8C=E8=AF=81=E4=BA=8C?=
 =?UTF-8?q?=E5=8F=89=E6=90=9C=E7=B4=A2=E6=A0=91.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0098.验证二叉搜索树.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/problems/0098.验证二叉搜索树.md b/problems/0098.验证二叉搜索树.md
index bb38ae35..262ad18c 100644
--- a/problems/0098.验证二叉搜索树.md
+++ b/problems/0098.验证二叉搜索树.md
@@ -639,6 +639,29 @@ object Solution {
 }
 ```
 
+## rust
+
+递归：
+
+```rust
+impl Solution {
+    pub fn is_valid_bst(root: Option<Rc<RefCell<TreeNode>>>) -> bool {
+        Self::valid_bst(i64::MIN, i64::MAX, root)
+    }
+    pub fn valid_bst(low: i64, upper: i64, root: Option<Rc<RefCell<TreeNode>>>) -> bool {
+        if root.is_none() {
+            return true;
+        }
+        let root = root.as_ref().unwrap().borrow();
+        if root.val as i64 <= low || root.val as i64 >= upper {
+            return false;
+        }
+        Self::valid_bst(low, root.val as i64, root.left.clone())
+            && Self::valid_bst(root.val as i64, upper, root.right.clone())
+    }
+}
+```
+
 <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 c230c2d871b2b9a93fbc137b17fb5ef8b1eea48a Mon Sep 17 00:00:00 2001
From: fw_qaq <82551626+Jack-Zhang-1314@users.noreply.github.com>
Date: Mon, 28 Nov 2022 17:23:00 +0800
Subject: [PATCH 2/2] =?UTF-8?q?Update=200098.=E9=AA=8C=E8=AF=81=E4=BA=8C?=
 =?UTF-8?q?=E5=8F=89=E6=90=9C=E7=B4=A2=E6=A0=91.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0098.验证二叉搜索树.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/problems/0098.验证二叉搜索树.md b/problems/0098.验证二叉搜索树.md
index 262ad18c..a925e36a 100644
--- a/problems/0098.验证二叉搜索树.md
+++ b/problems/0098.验证二叉搜索树.md
@@ -662,6 +662,32 @@ impl Solution {
 }
 ```
 
+辅助数组：
+
+```rust
+impl Solution {
+    pub fn is_valid_bst(root: Option<Rc<RefCell<TreeNode>>>) -> bool {
+        let mut vec = vec![];
+        Self::valid_bst(root, &mut vec);
+        for i in 1..vec.len() {
+            if vec[i] <= vec[i - 1] {
+                return false;
+            }
+        }
+        true
+    }
+    pub fn valid_bst(root: Option<Rc<RefCell<TreeNode>>>, mut v: &mut Vec<i64>) {
+        if root.is_none() {
+            return;
+        }
+        let node = root.as_ref().unwrap().borrow();
+        Self::valid_bst(node.left.clone(), v);
+        v.push(node.val as i64);
+        Self::valid_bst(node.right.clone(), v);
+    }
+}
+```
+
 <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"/>