diff --git a/.gitignore b/.gitignore
index 8ede3c2..c445fd4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,27 +4,7 @@
 # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
 
 # User-specific stuff
-.idea/**/workspace.xml
-.idea/**/tasks.xml
-.idea/**/usage.statistics.xml
-.idea/**/dictionaries
-.idea/**/shelf
-
-# Generated files
-.idea/**/contentModel.xml
-
-# Sensitive or high-churn files
-.idea/**/dataSources/
-.idea/**/dataSources.ids
-.idea/**/dataSources.local.xml
-.idea/**/sqlDataSources.xml
-.idea/**/dynamic.xml
-.idea/**/uiDesigner.xml
-.idea/**/dbnavigator.xml
-
-# Gradle
-.idea/**/gradle.xml
-.idea/**/libraries
+.idea/
 
 # Gradle and Maven with auto-import
 # When using Gradle or Maven with auto-import, you should exclude module files,
diff --git a/.idea/.gitignore b/.idea/.gitignore
deleted file mode 100644
index 5c98b42..0000000
--- a/.idea/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-# Default ignored files
-/workspace.xml
\ No newline at end of file
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
deleted file mode 100644
index a55e7a1..0000000
--- a/.idea/codeStyles/codeStyleConfig.xml
+++ /dev/null
@@ -1,5 +0,0 @@
-<component name="ProjectCodeStyleConfiguration">
-  <state>
-    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
-  </state>
-</component>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
deleted file mode 100644
index 6560a98..0000000
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ /dev/null
@@ -1,36 +0,0 @@
-<component name="InspectionProjectProfileManager">
-  <profile version="1.0">
-    <option name="myName" value="Project Default" />
-    <inspection_tool class="JavaDoc" enabled="true" level="WARNING" enabled_by_default="true">
-      <option name="TOP_LEVEL_CLASS_OPTIONS">
-        <value>
-          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
-          <option name="REQUIRED_TAGS" value="" />
-        </value>
-      </option>
-      <option name="INNER_CLASS_OPTIONS">
-        <value>
-          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
-          <option name="REQUIRED_TAGS" value="" />
-        </value>
-      </option>
-      <option name="METHOD_OPTIONS">
-        <value>
-          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
-          <option name="REQUIRED_TAGS" value="@return@param@throws or @exception" />
-        </value>
-      </option>
-      <option name="FIELD_OPTIONS">
-        <value>
-          <option name="ACCESS_JAVADOC_REQUIRED_FOR" value="none" />
-          <option name="REQUIRED_TAGS" value="" />
-        </value>
-      </option>
-      <option name="IGNORE_DEPRECATED" value="false" />
-      <option name="IGNORE_JAVADOC_PERIOD" value="true" />
-      <option name="IGNORE_DUPLICATED_THROWS" value="false" />
-      <option name="IGNORE_POINT_TO_ITSELF" value="false" />
-      <option name="myAdditionalJavadocTags" value="date" />
-    </inspection_tool>
-  </profile>
-</component>
\ No newline at end of file
diff --git a/.idea/markdown-doclet.xml b/.idea/markdown-doclet.xml
deleted file mode 100644
index a0355e9..0000000
--- a/.idea/markdown-doclet.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ch.raffael.mddoclet.integrations.idea.MarkdownDocletIdea.ProjectConfiguration">
-    <option name="enabled" value="false" />
-    <option name="renderingOptions">
-      <RenderingOptions />
-    </option>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
deleted file mode 100644
index 0548357..0000000
--- a/.idea/misc.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/out" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index 8fd8bd1..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/LeetCode.iml" filepath="$PROJECT_DIR$/LeetCode.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/uiDesigner.xml b/.idea/uiDesigner.xml
deleted file mode 100644
index e96534f..0000000
--- a/.idea/uiDesigner.xml
+++ /dev/null
@@ -1,124 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="Palette2">
-    <group name="Swing">
-      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
-      </item>
-      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
-      </item>
-      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
-      </item>
-      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
-        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
-      </item>
-      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
-        <initial-values>
-          <property name="text" value="Button" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
-        <initial-values>
-          <property name="text" value="RadioButton" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
-        <initial-values>
-          <property name="text" value="CheckBox" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
-        <initial-values>
-          <property name="text" value="Label" />
-        </initial-values>
-      </item>
-      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
-          <preferred-size width="150" height="-1" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
-          <preferred-size width="150" height="-1" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
-          <preferred-size width="150" height="-1" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
-      </item>
-      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
-          <preferred-size width="150" height="50" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
-          <preferred-size width="200" height="200" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
-          <preferred-size width="200" height="200" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
-      </item>
-      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
-      </item>
-      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
-      </item>
-      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
-      </item>
-      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
-          <preferred-size width="-1" height="20" />
-        </default-constraints>
-      </item>
-      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
-        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
-      </item>
-      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
-        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
-      </item>
-    </group>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
deleted file mode 100644
index 94a25f7..0000000
--- a/.idea/vcs.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="$PROJECT_DIR$" vcs="Git" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
deleted file mode 100644
index 9e74fec..0000000
--- a/.idea/workspace.xml
+++ /dev/null
@@ -1,828 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="BranchesTreeState">
-    <expand>
-      <path>
-        <item name="ROOT" type="e8cecc67:BranchNodeDescriptor" />
-        <item name="LOCAL_ROOT" type="e8cecc67:BranchNodeDescriptor" />
-      </path>
-      <path>
-        <item name="ROOT" type="e8cecc67:BranchNodeDescriptor" />
-        <item name="REMOTE_ROOT" type="e8cecc67:BranchNodeDescriptor" />
-      </path>
-      <path>
-        <item name="ROOT" type="e8cecc67:BranchNodeDescriptor" />
-        <item name="REMOTE_ROOT" type="e8cecc67:BranchNodeDescriptor" />
-        <item name="GROUP_NODE:origin" type="e8cecc67:BranchNodeDescriptor" />
-      </path>
-    </expand>
-    <select />
-  </component>
-  <component name="ChangeListManager">
-    <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/Rocket.md" beforeDir="false" afterPath="$PROJECT_DIR$/Rocket.md" afterDir="false" />
-    </list>
-    <option name="SHOW_DIALOG" value="false" />
-    <option name="HIGHLIGHT_CONFLICTS" value="true" />
-    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
-    <option name="LAST_RESOLUTION" value="IGNORE" />
-  </component>
-  <component name="CodeStyleSettingsInfer">
-    <option name="done" value="true" />
-  </component>
-  <component name="DatabaseView">
-    <option name="SHOW_INTERMEDIATE" value="true" />
-    <option name="GROUP_DATA_SOURCES" value="true" />
-    <option name="GROUP_SCHEMA" value="true" />
-    <option name="GROUP_CONTENTS" value="false" />
-    <option name="SORT_POSITIONED" value="false" />
-    <option name="SHOW_EMPTY_GROUPS" value="false" />
-    <option name="AUTO_SCROLL_FROM_SOURCE" value="false" />
-    <option name="HIDDEN_KINDS">
-      <set />
-    </option>
-    <expand />
-    <select />
-  </component>
-  <component name="FileTemplateManagerImpl">
-    <option name="RECENT_TEMPLATES">
-      <list>
-        <option value="Class" />
-      </list>
-    </option>
-  </component>
-  <component name="Git.Settings">
-    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
-    <option name="UPDATE_TYPE" value="MERGE" />
-  </component>
-  <component name="ProjectCodeStyleSettingsMigration">
-    <option name="version" value="1" />
-  </component>
-  <component name="ProjectId" id="1VejAt63XWcMUQr7gJbMHyEoS6Q" />
-  <component name="ProjectLevelVcsManager" settingsEditedManually="true">
-    <ConfirmationsSetting value="2" id="Add" />
-  </component>
-  <component name="ProjectViewState">
-    <option name="hideEmptyMiddlePackages" value="true" />
-    <option name="showLibraryContents" value="true" />
-  </component>
-  <component name="PropertiesComponent">
-    <property name="RunOnceActivity.OpenProjectViewOnStart" value="true" />
-    <property name="RunOnceActivity.ShowReadmeOnStart" value="true" />
-    <property name="SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
-    <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="add_unversioned_files" value="true" />
-    <property name="aspect.path.notification.shown" value="true" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="node.js.detected.package.eslint" value="true" />
-    <property name="node.js.detected.package.tslint" value="true" />
-    <property name="node.js.path.for.package.eslint" value="project" />
-    <property name="node.js.path.for.package.tslint" value="project" />
-    <property name="node.js.selected.package.eslint" value="(autodetect)" />
-    <property name="node.js.selected.package.tslint" value="(autodetect)" />
-    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
-    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
-    <property name="project.structure.last.edited" value="Modules" />
-    <property name="project.structure.proportion" value="0.15" />
-    <property name="project.structure.side.proportion" value="0.2" />
-    <property name="settings.editor.selected.configurable" value="preferences.pluginManager" />
-  </component>
-  <component name="RecentsManager">
-    <key name="CopyClassDialog.RECENTS_KEY">
-      <recent name="contest" />
-      <recent name="链表操作.q61_旋转链表" />
-      <recent name="链表操作.q19_删除链表的倒数第N个节点" />
-      <recent name="递归.q104_二叉树的最大深度" />
-      <recent name="快慢指针遍历.q876_链表的中间结点" />
-    </key>
-    <key name="CopyFile.RECENT_KEYS">
-      <recent name="$PROJECT_DIR$/src/hash相关" />
-      <recent name="$PROJECT_DIR$/src/etc/q1" />
-      <recent name="$PROJECT_DIR$/src/q206/f2" />
-      <recent name="$PROJECT_DIR$/src/q206/f1" />
-    </key>
-  </component>
-  <component name="RunManager" selected="Application.Test">
-    <configuration name="Main" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="Main" />
-      <module name="LeetCode" />
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="动态规划.q70_爬楼梯.Solution" />
-      <module name="LeetCode" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="动态规划.q70_爬楼梯.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Solution (3)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="contest.q4.Solution" />
-      <module name="LeetCode" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="contest.q4.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="数组操作.q78_子集.Solution" />
-      <module name="LeetCode" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="数组操作.q78_子集.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="动态规划.q746_使用最小花费爬楼梯.Solution" />
-      <module name="LeetCode" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="动态规划.q746_使用最小花费爬楼梯.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
-    <configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="q7.f1.Solution" />
-      <module name="LeetCode" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="q7.f1.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
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