diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 1271c27..cc98d65 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,15 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f1/ListNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f1/Solution.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f2/ListNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f2/Solution.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/数字操作/q202_快乐数/Solution.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/数字操作/q258_各位相加/Solution.java" afterDir="false" />
+    <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="add q141/q202/q258">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f1/ListNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/快慢指针遍历/q141_环形链表/f1/ListNode.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f1/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/快慢指针遍历/q141_环形链表/f1/Solution.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f2/ListNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/快慢指针遍历/q141_环形链表/f2/ListNode.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/hash相关/q141_环形链表/f2/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/快慢指针遍历/q141_环形链表/f2/Solution.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/数字操作/q202_快乐数/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/快慢指针遍历/q202_快乐数/Solution.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -282,7 +281,7 @@
       <workItem from="1582007077483" duration="2054000" />
       <workItem from="1582286924766" duration="554000" />
       <workItem from="1582552791282" duration="3963000" />
-      <workItem from="1582634245000" duration="10985000" />
+      <workItem from="1582634245000" duration="12720000" />
     </task>
     <task id="LOCAL-00001" summary="add q5/q7/q172">
       <created>1580045439607</created>
@@ -550,7 +549,14 @@
       <option name="project" value="LOCAL" />
       <updated>1582711917874</updated>
     </task>
-    <option name="localTasksCounter" value="39" />
+    <task id="LOCAL-00039" summary="add q141/q202/q258">
+      <created>1582718525647</created>
+      <option name="number" value="00039" />
+      <option name="presentableId" value="LOCAL-00039" />
+      <option name="project" value="LOCAL" />
+      <updated>1582718525647</updated>
+    </task>
+    <option name="localTasksCounter" value="40" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -603,7 +609,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="add  q3/q8/q11" />
     <MESSAGE value="add q6" />
     <MESSAGE value="add q14/q16/q20" />
     <MESSAGE value="add q21" />
@@ -628,7 +633,8 @@
     <MESSAGE value="add q736" />
     <MESSAGE value="增加操作系统相关问题" />
     <MESSAGE value="增加JVM相关问题" />
-    <option name="LAST_COMMIT_MESSAGE" value="增加JVM相关问题" />
+    <MESSAGE value="add q141/q202/q258" />
+    <option name="LAST_COMMIT_MESSAGE" value="add q141/q202/q258" />
   </component>
   <component name="WindowStateProjectService">
     <state x="320" y="115" key="#Inspections" timestamp="1581061018990">
@@ -643,10 +649,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="533" y="166" key="#com.intellij.ide.util.MemberChooser/0.0.1440.900@0.0.1440.900" timestamp="1578548165321" />
-    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1582711917502">
+    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1582719938529">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1582711917502" />
+    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1582719938529" />
     <state x="144" y="78" width="1152" height="720" key="DiffContextDialog" timestamp="1582714686712">
       <screen x="0" y="23" width="1440" height="793" />
     </state>
@@ -697,10 +703,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="221" y="63" key="SettingsEditor/0.0.1440.900@0.0.1440.900" timestamp="1581061096545" />
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1582711919217">
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1582718527035">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1582711919217" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1582718527035" />
     <state x="100" y="100" width="1240" height="700" key="com.intellij.history.integration.ui.views.DirectoryHistoryDialog" timestamp="1581744794182">
       <screen x="0" y="23" width="1440" height="797" />
     </state>
diff --git a/README.md b/README.md
index 1e45ed1..0e0b3ba 100644
--- a/README.md
+++ b/README.md
@@ -5,14 +5,13 @@
 ### Hash相关
 
 * [q1_两数之和](/src/hash相关/q1_两数之和)
-* [q141_环形链表](/src/hash相关/q141_环形链表)
 
 ### 链表操作
 
 * [q2_两数相加](/src/链表操作/q2_两数相加)
 * [q206_反转链表](/src/链表操作/q206_反转链表)
 
-### 双指针遍历
+### 双指针遍历/滑动窗口
 
 * [q3_无重复字符的最长子串](/src/双指针遍历/q3_无重复字符的最长子串)
 * [q11_盛最多水的容器](/src/双指针遍历/q11_盛最多水的容器)
@@ -23,6 +22,11 @@
 * [q121_买卖股票的最佳时机](/src/双指针遍历/q121_买卖股票的最佳时机)
 * [q209_长度最小的子数组](/src/双指针遍历/q209_长度最小的子数组)
 
+### 快慢指针遍历
+
+* [q141_环形链表](/src/快慢指针遍历/q141_环形链表)
+* [q202_快乐数](/src/快慢指针遍历/q202_快乐数)
+
 ### 字符串操作
 
 * [q6_Z字形变换](/src/字符串操作/q6_Z字形变换)
@@ -36,7 +40,6 @@
 * [q9_回文数](/src/数字操作/q9_回文数)
 * [q43_字符串相乘](/src/数字操作/q43_字符串相乘)
 * [q172_阶乘后的零](/src/数字操作/q172_阶乘后的零)
-* [q202_快乐数](/src/数字操作/q202_快乐数)
 * [q258_各位相加](/src/数字操作/q258_各位相加)
 
 ### 数组操作
diff --git a/src/hash相关/q141_环形链表/f1/ListNode.java b/src/快慢指针遍历/q141_环形链表/f1/ListNode.java
similarity index 100%
rename from src/hash相关/q141_环形链表/f1/ListNode.java
rename to src/快慢指针遍历/q141_环形链表/f1/ListNode.java
diff --git a/src/hash相关/q141_环形链表/f1/Solution.java b/src/快慢指针遍历/q141_环形链表/f1/Solution.java
similarity index 100%
rename from src/hash相关/q141_环形链表/f1/Solution.java
rename to src/快慢指针遍历/q141_环形链表/f1/Solution.java
diff --git a/src/hash相关/q141_环形链表/f2/ListNode.java b/src/快慢指针遍历/q141_环形链表/f2/ListNode.java
similarity index 100%
rename from src/hash相关/q141_环形链表/f2/ListNode.java
rename to src/快慢指针遍历/q141_环形链表/f2/ListNode.java
diff --git a/src/hash相关/q141_环形链表/f2/Solution.java b/src/快慢指针遍历/q141_环形链表/f2/Solution.java
similarity index 100%
rename from src/hash相关/q141_环形链表/f2/Solution.java
rename to src/快慢指针遍历/q141_环形链表/f2/Solution.java
diff --git a/src/数字操作/q202_快乐数/Solution.java b/src/快慢指针遍历/q202_快乐数/Solution.java
similarity index 100%
rename from src/数字操作/q202_快乐数/Solution.java
rename to src/快慢指针遍历/q202_快乐数/Solution.java