Merge pull request #1797 from fwqaaq/patch-9

Update 0235.二叉搜索树的最近公共祖先.md about rust

problems/0235.二叉搜索树的最近公共祖先.md

@@ -429,6 +429,67 @@ object Solution {
 }
 ```
 
+## rust
+
+递归：
+
+```rust
+impl Solution {
+    pub fn lowest_common_ancestor(
+        root: Option<Rc<RefCell<TreeNode>>>,
+        p: Option<Rc<RefCell<TreeNode>>>,
+        q: Option<Rc<RefCell<TreeNode>>>,
+    ) -> Option<Rc<RefCell<TreeNode>>> {
+        let q_val = q.as_ref().unwrap().borrow().val;
+        let p_val = p.as_ref().unwrap().borrow().val;
+        let root_val = root.as_ref().unwrap().borrow().val;
+
+        if root_val > q_val && root_val > p_val {
+            return Self::lowest_common_ancestor(
+                root.as_ref().unwrap().borrow().left.clone(),
+                p,
+                q,
+            );
+        };
+
+        if root_val < q_val && root_val < p_val {
+            return Self::lowest_common_ancestor(
+                root.as_ref().unwrap().borrow().right.clone(),
+                p,
+                q,
+            );
+        }
+        root
+    }
+}
+```
+
+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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