diff --git a/LeetCode/src/main/java/com/code/leet/entiy/Node.java b/LeetCode/src/main/java/com/code/leet/entiy/Node.java
index c811715..4c39b25 100644
--- a/LeetCode/src/main/java/com/code/leet/entiy/Node.java
+++ b/LeetCode/src/main/java/com/code/leet/entiy/Node.java
@@ -4,10 +4,18 @@ public class Node {
     public int val;
     public Node next;
     public Node random;
+    public Node prev;
+    public Node child;
 
     public Node(int val) {
         this.val = val;
         this.next = null;
         this.random = null;
     }
+
+    public Node(int val, Node prev, Node head, Node next) {
+        head.val = val;
+        head.prev = prev;
+        head.next = next;
+    }
 }