diff --git a/src/main/java/cn/whaifree/designPattern/ChainPattern/ChainPattern.java b/src/main/java/cn/whaifree/designPattern/ChainPattern/ChainPattern.java
new file mode 100644
index 0000000..e6b4a15
--- /dev/null
+++ b/src/main/java/cn/whaifree/designPattern/ChainPattern/ChainPattern.java
@@ -0,0 +1,109 @@
+package cn.whaifree.designPattern.ChainPattern;
+
+import lombok.Setter;
+
+import java.util.Scanner;
+
+/**
+ *
+ * <a href="https://kamacoder.com/problempage.php?pid=1100">...</a>
+ *
+ * @version 1.0
+ * @Author whai文海
+ * @Date 2024/9/12 23:37
+ * @注释
+ */
+public class ChainPattern {
+
+
+
+
+
+}
+
+class Main{
+    public static void main(String[] args) {
+        Audit.Builder builder = new Audit.Builder();
+        AbstractAudit build = builder.setAudit(new Supervisor())
+                .setAudit(new Manager())
+                .setAudit(new Director())
+                .build();
+
+
+        Scanner scanner = new Scanner(System.in);
+        int i = scanner.nextInt();
+        for (int j = 0; j < i; j++) {
+            build.process(scanner.next(), scanner.nextInt());
+        }
+    }
+
+
+}
+
+interface Audit{
+    void process(String name,int day);
+
+    public static class Builder{
+        AbstractAudit head;
+
+        public Builder setAudit(AbstractAudit audit) {
+            if (head == null) {
+                head = audit;
+            }else {
+                AbstractAudit index = head;
+                index.setNext(audit);
+            }
+            return this;
+        }
+
+        public AbstractAudit build(){
+            return head;
+        }
+
+    }
+
+}
+
+@Setter
+abstract class AbstractAudit implements  Audit{
+    Audit next;
+
+}
+
+class Supervisor extends AbstractAudit {
+
+    @Override
+    public void process(String name,int day) {
+        if (day <= 3) {
+            System.out.println(name + " Approved by Supervisor");
+        }
+        else {
+            this.next.process(name, day);
+        }
+    }
+}
+
+class Manager extends AbstractAudit {
+
+    @Override
+    public void process(String name,int day) {
+        if (day > 3 && day <= 7) {
+            System.out.println(name + " Approved by Manager");
+        }else {
+            this.next.process(name, day);
+        }
+    }
+}
+
+class Director extends AbstractAudit {
+
+    @Override
+    public void process(String name,int day) {
+        if (day<=10&&day > 7) {
+            System.out.println(name + " Approved by Director");
+        }else {
+            System.out.println(name + " Denied by Director.");
+        }
+    }
+}
+
diff --git a/src/main/java/cn/whaifree/leetCode/LinkedList/LCR155.java b/src/main/java/cn/whaifree/leetCode/LinkedList/LCR155.java
index 5a60f1a..2182ed9 100644
--- a/src/main/java/cn/whaifree/leetCode/LinkedList/LCR155.java
+++ b/src/main/java/cn/whaifree/leetCode/LinkedList/LCR155.java
@@ -1,16 +1,144 @@
 package cn.whaifree.leetCode.LinkedList;
 
-import cn.whaifree.leetCode.model.TreeNode;
+import org.junit.Test;
+
+import java.util.*;
 
 public class LCR155 {
 
-//    https://leetcode.cn/problems/er-cha-sou-suo-shu-yu-shuang-xiang-lian-biao-lcof/description/
+
+    public static void main(String[] args) {
+        new Thread(() -> {
+            List<byte[]> list = new ArrayList<byte[]>();
+            while (true) {
+//
+            }
+        }).start();
+
+        // 线程二
+        new Thread(() -> {
+            while (true) {
+                System.out.println(new Date().toString() + Thread.currentThread() + "==");
+                try {
+                    Thread.sleep(100);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }).start();
+    }
+
+    //    https://leetcode.cn/problems/er-cha-sou-suo-shu-yu-shuang-xiang-lian-biao-lcof/description/
+    static class Node {
+        public int val;
+        public Node left;
+        public Node right;
+
+        public Node() {
+        }
+
+        public Node(int _val) {
+            val = _val;
+        }
+
+        public Node(int _val, Node _left, Node _right) {
+            val = _val;
+            left = _left;
+            right = _right;
+        }
+    }
+
+    @Test
+    public void test() {
+        Node node1 = new Node(4);
+        node1.left = new Node(2);
+        node1.right = new Node(5);
+        node1.left.left = new Node(1);
+        node1.left.right = new Node(3);
+        Node node = new Solution1().treeToDoublyList(node1);
+
+    }
 
     class Solution {
 
+        public Node treeToDoublyList(Node root) {
 
-        public TreeNode treeToDoublyList(TreeNode root) {
+            if (root == null) {
+                return null;
+            }
+            if (root.left == null && root.right == null) {
+                root.right = root;
+                root.left = root;
+                return root;
+            }
 
+
+            List<Node> nodes = new ArrayList<>();
+            Deque<Node> deque = new LinkedList<>();
+            deque.add(root);
+            while (!deque.isEmpty()) {
+                Node pop = deque.pop();
+                if (pop != null) {
+                    if (pop.right != null) {
+                        deque.push(pop.right);
+                    }
+                    deque.push(pop);
+                    deque.push(null);
+                    if (pop.left != null) {
+                        deque.push(pop.left);
+                    }
+                }else {
+                    nodes.add(deque.pop());
+                }
+            }
+
+
+            Node head = new Node(Integer.MAX_VALUE);
+            Node index = head;
+            for (int i = 0; i < nodes.size() - 1; i++) {
+                Node node = nodes.get(i);
+                index.right = node;
+                node.left = index;
+                index = index.right;
+            }
+            Node node = nodes.get(nodes.size() - 1);
+           index.right = node;
+            node.left = index;
+            node.right = head.right;
+            head.right.left = node;
+
+
+            return head.right;
+        }
+
+    }
+
+    class Solution1 {
+
+        Node pre;
+        Node index;
+        public Node treeToDoublyList(Node root) {
+            pre = new Node(-1);
+            index = pre;
+            in(root);
+            index.right = pre.right;
+            pre.right.left = index;
+            return pre.right;
+        }
+
+        public void in(Node root) {
+            if (root == null) {
+                return;
+            }
+
+            in(root.left);
+            index.right = root;
+            root.left = index;
+            index = index.right;
+
+            in(root.right);
         }
     }
+
+
 }