Merge pull request #1757 from Jack-Zhang-1314/patch-18

Update 0110.平衡二叉树.md about rust

problems/0110.平衡二叉树.md

@@ -810,6 +810,38 @@ func getHeight(_ root: TreeNode?) -> Int {
 }
 ```
 
+### rust
+
+递归
+
+```rust
+use std::cell::RefCell;
+use std::rc::Rc;
+impl Solution {
+    pub fn is_balanced(root: Option<Rc<RefCell<TreeNode>>>) -> bool {
+        Self::get_depth(root) != -1
+    }
+    pub fn get_depth(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
+        if root.is_none() {
+            return 0;
+        }
+        let right = Self::get_depth(root.as_ref().unwrap().borrow().left.clone());
+        let left = Self::get_depth(root.unwrap().borrow().right.clone());
+        if right == -1 {
+            return -1;
+        }
+        if left == -1 {
+            return -1;
+        }
+        if (right - left).abs() > 1 {
+            return -1;
+        }
+
+        1 + right.max(left)
+    }
+}
+```
+
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