diff --git a/src/main/java/com/cool/Template.java b/src/main/java/com/cool/Template.java
index 3f254d3..a6add8d 100644
--- a/src/main/java/com/cool/Template.java
+++ b/src/main/java/com/cool/Template.java
@@ -5,6 +5,7 @@ public class Template {
     /**
      * Date 2924/8/19
      * DayNumber 1/2/3/4
+     * hard  1
      * @param template
      */
     public void test(int template){
diff --git a/src/main/java/com/cool/hot100/linkedlist/ListNode.java b/src/main/java/com/cool/hot100/linkedlist/ListNode.java
new file mode 100644
index 0000000..04647fb
--- /dev/null
+++ b/src/main/java/com/cool/hot100/linkedlist/ListNode.java
@@ -0,0 +1,23 @@
+package com.cool.hot100.linkedlist;
+
+
+public class ListNode {
+    int val;
+    ListNode next;
+
+    ListNode() {
+    }
+
+    ListNode(int val) {
+        this.val = val;
+    }
+
+    ListNode(int val, ListNode next) {
+        this.val = val;
+        this.next = next;
+    }
+}
+
+
+
+
diff --git a/src/main/java/com/cool/hot100/linkedlist/Num206.java b/src/main/java/com/cool/hot100/linkedlist/Num206.java
new file mode 100644
index 0000000..ead1513
--- /dev/null
+++ b/src/main/java/com/cool/hot100/linkedlist/Num206.java
@@ -0,0 +1,17 @@
+package com.cool.hot100.linkedlist;
+
+public class Num206 {
+
+    /**
+     * Date 2024/8/20
+     * DayNumber 1
+     * Hard 1
+     * @param head
+     * @return
+     */
+
+    public ListNode reverseList(ListNode head) {
+
+    }
+
+}