Update 0235.二叉搜索树的最近公共祖先.md

problems/0235.二叉搜索树的最近公共祖先.md

@@ -420,6 +420,8 @@ object Solution {
 
 ## rust
 
+递归：
+
 ```rust
 impl Solution {
     pub fn lowest_common_ancestor(
@@ -451,6 +453,32 @@ impl Solution {
 }
 ```
 
+迭代：
+
+```rust
+impl Solution {
+    pub fn lowest_common_ancestor(
+        mut root: Option<Rc<RefCell<TreeNode>>>,
+        p: Option<Rc<RefCell<TreeNode>>>,
+        q: Option<Rc<RefCell<TreeNode>>>,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        let p_val = p.unwrap().borrow().val;
+        let q_val = q.unwrap().borrow().val;
+        while let Some(node) = root.clone() {
+            let root_val = node.borrow().val;
+            if root_val > q_val && root_val > p_val {
+                root = node.borrow().left.clone();
+            } else if root_val < q_val && root_val < p_val {
+                root = node.borrow().right.clone();
+            } else {
+                return root;
+            }
+        }
+        None
+    }
+}
+```
+
 
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