diff --git a/src/main/java/com/code/leet/contest1/Solution1.java b/src/main/java/com/code/leet/contest/contest1/Solution1.java
similarity index 94%
rename from src/main/java/com/code/leet/contest1/Solution1.java
rename to src/main/java/com/code/leet/contest/contest1/Solution1.java
index 0280e1a..afbea67 100644
--- a/src/main/java/com/code/leet/contest1/Solution1.java
+++ b/src/main/java/com/code/leet/contest/contest1/Solution1.java
@@ -1,6 +1,4 @@
-package com.code.leet.contest1;
-
-import java.util.*;
+package com.code.leet.contest.contest1;
 
 public class Solution1 {
     public static void main(String[] args) {
diff --git a/src/main/java/com/code/leet/contest1/Solution2.java b/src/main/java/com/code/leet/contest/contest1/Solution2.java
similarity index 96%
rename from src/main/java/com/code/leet/contest1/Solution2.java
rename to src/main/java/com/code/leet/contest/contest1/Solution2.java
index 8179a38..5c6514b 100644
--- a/src/main/java/com/code/leet/contest1/Solution2.java
+++ b/src/main/java/com/code/leet/contest/contest1/Solution2.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest1;
+package com.code.leet.contest.contest1;
 
 import java.util.*;
 
diff --git a/src/main/java/com/code/leet/contest1/Solution3.java b/src/main/java/com/code/leet/contest/contest1/Solution3.java
similarity index 95%
rename from src/main/java/com/code/leet/contest1/Solution3.java
rename to src/main/java/com/code/leet/contest/contest1/Solution3.java
index 9d7e9c6..b2f75e5 100644
--- a/src/main/java/com/code/leet/contest1/Solution3.java
+++ b/src/main/java/com/code/leet/contest/contest1/Solution3.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest1;
+package com.code.leet.contest.contest1;
 
 import com.code.leet.entiy.ListNode;
 
diff --git a/src/main/java/com/code/leet/contest1/Solution4.java b/src/main/java/com/code/leet/contest/contest1/Solution4.java
similarity index 93%
rename from src/main/java/com/code/leet/contest1/Solution4.java
rename to src/main/java/com/code/leet/contest/contest1/Solution4.java
index a22a9fb..df37efc 100644
--- a/src/main/java/com/code/leet/contest1/Solution4.java
+++ b/src/main/java/com/code/leet/contest/contest1/Solution4.java
@@ -1,6 +1,4 @@
-package com.code.leet.contest1;
-
-import java.util.Arrays;
+package com.code.leet.contest.contest1;
 
 public class Solution4 {
     public static void main(String[] args) {
diff --git a/src/main/java/com/code/leet/contest1/Solution5.java b/src/main/java/com/code/leet/contest/contest1/Solution5.java
similarity index 95%
rename from src/main/java/com/code/leet/contest1/Solution5.java
rename to src/main/java/com/code/leet/contest/contest1/Solution5.java
index 15839d2..e44805f 100644
--- a/src/main/java/com/code/leet/contest1/Solution5.java
+++ b/src/main/java/com/code/leet/contest/contest1/Solution5.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest1;
+package com.code.leet.contest.contest1;
 
 public class Solution5 {
     public static void main(String[] args) {
diff --git a/src/main/java/com/code/leet/contest1/Solution6.java b/src/main/java/com/code/leet/contest/contest1/Solution6.java
similarity index 98%
rename from src/main/java/com/code/leet/contest1/Solution6.java
rename to src/main/java/com/code/leet/contest/contest1/Solution6.java
index b34c54a..0a48922 100644
--- a/src/main/java/com/code/leet/contest1/Solution6.java
+++ b/src/main/java/com/code/leet/contest/contest1/Solution6.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest1;
+package com.code.leet.contest.contest1;
 
 import java.util.Arrays;
 import java.util.LinkedList;
diff --git a/src/main/java/com/code/leet/contest2/Solution1.java b/src/main/java/com/code/leet/contest/contest2/Solution1.java
similarity index 91%
rename from src/main/java/com/code/leet/contest2/Solution1.java
rename to src/main/java/com/code/leet/contest/contest2/Solution1.java
index 024652b..586ea47 100644
--- a/src/main/java/com/code/leet/contest2/Solution1.java
+++ b/src/main/java/com/code/leet/contest/contest2/Solution1.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest2;
+package com.code.leet.contest.contest2;
 
 import java.util.Arrays;
 
diff --git a/src/main/java/com/code/leet/contest2/Solution2.java b/src/main/java/com/code/leet/contest/contest2/Solution2.java
similarity index 92%
rename from src/main/java/com/code/leet/contest2/Solution2.java
rename to src/main/java/com/code/leet/contest/contest2/Solution2.java
index f9cdfd3..dd74081 100644
--- a/src/main/java/com/code/leet/contest2/Solution2.java
+++ b/src/main/java/com/code/leet/contest/contest2/Solution2.java
@@ -1,6 +1,4 @@
-package com.code.leet.contest2;
-
-import java.util.*;
+package com.code.leet.contest.contest2;
 
 public class Solution2 {
     public static void main(String[] args) {
diff --git a/src/main/java/com/code/leet/contest2/Solution3.java b/src/main/java/com/code/leet/contest/contest2/Solution3.java
similarity index 94%
rename from src/main/java/com/code/leet/contest2/Solution3.java
rename to src/main/java/com/code/leet/contest/contest2/Solution3.java
index 8799d51..680a302 100644
--- a/src/main/java/com/code/leet/contest2/Solution3.java
+++ b/src/main/java/com/code/leet/contest/contest2/Solution3.java
@@ -1,6 +1,4 @@
-package com.code.leet.contest2;
-
-import com.code.leet.entiy.ListNode;
+package com.code.leet.contest.contest2;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/java/com/code/leet/contest2/Solution4.java b/src/main/java/com/code/leet/contest/contest2/Solution4.java
similarity index 98%
rename from src/main/java/com/code/leet/contest2/Solution4.java
rename to src/main/java/com/code/leet/contest/contest2/Solution4.java
index c1abc08..4780a40 100644
--- a/src/main/java/com/code/leet/contest2/Solution4.java
+++ b/src/main/java/com/code/leet/contest/contest2/Solution4.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest2;
+package com.code.leet.contest.contest2;
 
 import java.util.*;
 
diff --git a/src/main/java/com/code/leet/contest2/Solution5.java b/src/main/java/com/code/leet/contest/contest2/Solution5.java
similarity index 96%
rename from src/main/java/com/code/leet/contest2/Solution5.java
rename to src/main/java/com/code/leet/contest/contest2/Solution5.java
index 51e3af1..5b7aade 100644
--- a/src/main/java/com/code/leet/contest2/Solution5.java
+++ b/src/main/java/com/code/leet/contest/contest2/Solution5.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest2;
+package com.code.leet.contest.contest2;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/java/com/code/leet/contest2/Solution6.java b/src/main/java/com/code/leet/contest/contest2/Solution6.java
similarity index 94%
rename from src/main/java/com/code/leet/contest2/Solution6.java
rename to src/main/java/com/code/leet/contest/contest2/Solution6.java
index 20d2ede..7c7939b 100644
--- a/src/main/java/com/code/leet/contest2/Solution6.java
+++ b/src/main/java/com/code/leet/contest/contest2/Solution6.java
@@ -1,7 +1,6 @@
-package com.code.leet.contest2;
+package com.code.leet.contest.contest2;
 
 import java.util.*;
-import java.util.stream.Collectors;
 
 public class Solution6 {
     public static void main(String[] args) {
diff --git a/src/main/java/com/code/leet/contest3/Solution1.java b/src/main/java/com/code/leet/contest/contest3/Solution1.java
similarity index 92%
rename from src/main/java/com/code/leet/contest3/Solution1.java
rename to src/main/java/com/code/leet/contest/contest3/Solution1.java
index ac35f61..f6f819a 100644
--- a/src/main/java/com/code/leet/contest3/Solution1.java
+++ b/src/main/java/com/code/leet/contest/contest3/Solution1.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest3;
+package com.code.leet.contest.contest3;
 
 import com.code.leet.entiy.TreeNode;
 
diff --git a/src/main/java/com/code/leet/contest3/Solution2.java b/src/main/java/com/code/leet/contest/contest3/Solution2.java
similarity index 95%
rename from src/main/java/com/code/leet/contest3/Solution2.java
rename to src/main/java/com/code/leet/contest/contest3/Solution2.java
index c08b20c..9dd945c 100644
--- a/src/main/java/com/code/leet/contest3/Solution2.java
+++ b/src/main/java/com/code/leet/contest/contest3/Solution2.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest3;
+package com.code.leet.contest.contest3;
 
 import com.code.leet.entiy.TreeNode;
 
diff --git a/src/main/java/com/code/leet/contest3/Solution3.java b/src/main/java/com/code/leet/contest/contest3/Solution3.java
similarity index 97%
rename from src/main/java/com/code/leet/contest3/Solution3.java
rename to src/main/java/com/code/leet/contest/contest3/Solution3.java
index 6da52a8..c406563 100644
--- a/src/main/java/com/code/leet/contest3/Solution3.java
+++ b/src/main/java/com/code/leet/contest/contest3/Solution3.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest3;
+package com.code.leet.contest.contest3;
 
 import com.code.leet.entiy.TreeNode;
 
diff --git a/src/main/java/com/code/leet/contest3/Solution4.java b/src/main/java/com/code/leet/contest/contest3/Solution4.java
similarity index 95%
rename from src/main/java/com/code/leet/contest3/Solution4.java
rename to src/main/java/com/code/leet/contest/contest3/Solution4.java
index 133807a..d4fd0b6 100644
--- a/src/main/java/com/code/leet/contest3/Solution4.java
+++ b/src/main/java/com/code/leet/contest/contest3/Solution4.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest3;
+package com.code.leet.contest.contest3;
 
 import com.code.leet.entiy.TreeNode;
 
diff --git a/src/main/java/com/code/leet/contest3/Solution5.java b/src/main/java/com/code/leet/contest/contest3/Solution5.java
similarity index 97%
rename from src/main/java/com/code/leet/contest3/Solution5.java
rename to src/main/java/com/code/leet/contest/contest3/Solution5.java
index b7ad007..2c096e5 100644
--- a/src/main/java/com/code/leet/contest3/Solution5.java
+++ b/src/main/java/com/code/leet/contest/contest3/Solution5.java
@@ -1,4 +1,4 @@
-package com.code.leet.contest3;
+package com.code.leet.contest.contest3;
 
 import com.code.leet.entiy.TreeNode;