Update 二叉树中递归带着回溯.md

problems/二叉树中递归带着回溯.md

@@ -617,6 +617,38 @@ func _binaryTreePaths3(_ root: TreeNode, res: inout [String], paths: inout [Int]
 }
 ```
 
+### Rust
+
+> 100.相同的树
+
+```rsut
+use std::cell::RefCell;
+use std::rc::Rc;
+impl Solution {
+    pub fn is_same_tree(
+        p: Option<Rc<RefCell<TreeNode>>>,
+        q: Option<Rc<RefCell<TreeNode>>>,
+    ) -> bool {
+        match (p, q) {
+            (None, None) => true,
+            (None, Some(_)) => false,
+            (Some(_), None) => false,
+            (Some(n1), Some(n2)) => {
+                if n1.borrow().val == n2.borrow().val {
+                    let right =
+                        Self::is_same_tree(n1.borrow().left.clone(), n2.borrow().left.clone());
+                    let left =
+                        Self::is_same_tree(n1.borrow().right.clone(), n2.borrow().right.clone());
+                    right && left
+                } else {
+                    false
+                }
+            }
+        }
+    }
+}
+```
+
 
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