diff --git a/src/main/java/com/zhangshu/chat/demo/Solution.java b/src/main/java/com/zhangshu/chat/demo/Solution.java
deleted file mode 100644
index 461e1f3..0000000
--- a/src/main/java/com/zhangshu/chat/demo/Solution.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.zhangshu.chat.demo;
-
-public class Solution {
-
-    public int[] findDiagonalOrder(int[][] mat) {
-        int
-    }
-
-}