From 112e1a8834c7431fe9fafeb319f6fb8ea522266e Mon Sep 17 00:00:00 2001
From: yanquancheng <devel89@sina.cn>
Date: Sun, 9 Aug 2020 22:59:41 +0800
Subject: [PATCH 1/6] m

---
 test | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 test

diff --git a/test b/test
new file mode 100644
index 0000000..e69de29

From 3d5455ec63e8e0e4803112e139fc0cf48b260ee6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=8F=C3=BE=C2=B3=C3=90?= <yanquan.cyq@antfin.com>
Date: Mon, 10 Aug 2020 12:03:14 +0800
Subject: [PATCH 2/6] u

---
 test | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test b/test
index e69de29..68055f1 100644
--- a/test
+++ b/test
@@ -0,0 +1,2 @@
+test comunication
+

From c0e5f1c3a05f3cf935403927df4dc0c2daaf7318 Mon Sep 17 00:00:00 2001
From: cyq <devel89@sina.cn>
Date: Sun, 16 Aug 2020 23:59:37 +0800
Subject: [PATCH 3/6] cyq

---
 Week_01/.idea/Week_01.iml                     |   9 +
 Week_01/.idea/compiler.xml                    |   6 +
 Week_01/.idea/dictionaries/devel.xml          |   3 +
 Week_01/.idea/encodings.xml                   |   6 +
 .../inspectionProfiles/Project_Default.xml    |  36 ++
 Week_01/.idea/kotlinc.xml                     |  10 +
 Week_01/.idea/libraries/KotlinJavaRuntime.xml |  19 +
 Week_01/.idea/misc.xml                        |  10 +
 Week_01/.idea/modules.xml                     |   9 +
 Week_01/.idea/uiDesigner.xml                  | 124 ++++++
 Week_01/.idea/workspace.xml                   | 401 ++++++++++++++++++
 Week_01/README.md                             |  21 +-
 Week_01/week01/src/HomeWorkCyq.java           | 243 +++++++++++
 Week_01/week01/src/ModifyDequeByAdd.java      |   8 +
 Week_01/week01/src/test.java                  |   5 +
 Week_01/week01/week01.iml                     |  12 +
 16 files changed, 921 insertions(+), 1 deletion(-)
 create mode 100644 Week_01/.idea/Week_01.iml
 create mode 100644 Week_01/.idea/compiler.xml
 create mode 100644 Week_01/.idea/dictionaries/devel.xml
 create mode 100644 Week_01/.idea/encodings.xml
 create mode 100644 Week_01/.idea/inspectionProfiles/Project_Default.xml
 create mode 100644 Week_01/.idea/kotlinc.xml
 create mode 100644 Week_01/.idea/libraries/KotlinJavaRuntime.xml
 create mode 100644 Week_01/.idea/misc.xml
 create mode 100644 Week_01/.idea/modules.xml
 create mode 100644 Week_01/.idea/uiDesigner.xml
 create mode 100644 Week_01/.idea/workspace.xml
 create mode 100644 Week_01/week01/src/HomeWorkCyq.java
 create mode 100644 Week_01/week01/src/ModifyDequeByAdd.java
 create mode 100644 Week_01/week01/src/test.java
 create mode 100644 Week_01/week01/week01.iml

diff --git a/Week_01/.idea/Week_01.iml b/Week_01/.idea/Week_01.iml
new file mode 100644
index 0000000..d6ebd48
--- /dev/null
+++ b/Week_01/.idea/Week_01.iml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/Week_01/.idea/compiler.xml b/Week_01/.idea/compiler.xml
new file mode 100644
index 0000000..f8d1dda
--- /dev/null
+++ b/Week_01/.idea/compiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <option name="BUILD_PROCESS_HEAP_SIZE" value="800" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/.idea/dictionaries/devel.xml b/Week_01/.idea/dictionaries/devel.xml
new file mode 100644
index 0000000..dd319fa
--- /dev/null
+++ b/Week_01/.idea/dictionaries/devel.xml
@@ -0,0 +1,3 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="devel" />
+</component>
\ No newline at end of file
diff --git a/Week_01/.idea/encodings.xml b/Week_01/.idea/encodings.xml
new file mode 100644
index 0000000..d7865d5
--- /dev/null
+++ b/Week_01/.idea/encodings.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" native2AsciiForPropertiesFiles="true" defaultCharsetForPropertiesFiles="GBK">
+    <file url="PROJECT" charset="GBK" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/.idea/inspectionProfiles/Project_Default.xml b/Week_01/.idea/inspectionProfiles/Project_Default.xml
new file mode 100644
index 0000000..6560a98
--- /dev/null
+++ b/Week_01/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,36 @@
+<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/Week_01/.idea/kotlinc.xml b/Week_01/.idea/kotlinc.xml
new file mode 100644
index 0000000..3c50bd3
--- /dev/null
+++ b/Week_01/.idea/kotlinc.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JvmCompilerArguments">
+    <option name="jvmTarget" value="1.8" />
+  </component>
+  <component name="KotlinCommonCompilerArguments">
+    <option name="apiVersion" value="1.2" />
+    <option name="languageVersion" value="1.2" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/.idea/libraries/KotlinJavaRuntime.xml b/Week_01/.idea/libraries/KotlinJavaRuntime.xml
new file mode 100644
index 0000000..1a7265d
--- /dev/null
+++ b/Week_01/.idea/libraries/KotlinJavaRuntime.xml
@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="KotlinJavaRuntime">
+    <CLASSES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/Week_01/.idea/misc.xml b/Week_01/.idea/misc.xml
new file mode 100644
index 0000000..84efc80
--- /dev/null
+++ b/Week_01/.idea/misc.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JsCompilerArguments">
+    <option name="sourceMapEmbedSources" />
+    <option name="sourceMapPrefix" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_9" default="false" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/outPut" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/.idea/modules.xml b/Week_01/.idea/modules.xml
new file mode 100644
index 0000000..8cab903
--- /dev/null
+++ b/Week_01/.idea/modules.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/Week_01.iml" filepath="$PROJECT_DIR$/.idea/Week_01.iml" />
+      <module fileurl="file://$PROJECT_DIR$/week01/week01.iml" filepath="$PROJECT_DIR$/week01/week01.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/.idea/uiDesigner.xml b/Week_01/.idea/uiDesigner.xml
new file mode 100644
index 0000000..e96534f
--- /dev/null
+++ b/Week_01/.idea/uiDesigner.xml
@@ -0,0 +1,124 @@
+<?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$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/.idea/workspace.xml b/Week_01/.idea/workspace.xml
new file mode 100644
index 0000000..adae5a0
--- /dev/null
+++ b/Week_01/.idea/workspace.xml
@@ -0,0 +1,401 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="4272ed7b-a257-4c1c-abc1-6bc06ebb8df7" name="Default" comment="" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="TRACKING_ENABLED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileEditorManager">
+    <leaf>
+      <file leaf-file-name="README.md" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/README.md">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="285">
+              <caret line="19" column="54" selection-start-line="19" selection-start-column="54" selection-end-line="19" selection-end-column="54" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="ModifyDequeByAdd.java" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/week01/src/ModifyDequeByAdd.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="120">
+              <caret line="8" lean-forward="true" selection-start-line="8" selection-end-line="8" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="HomeWorkCyq.java" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/week01/src/HomeWorkCyq.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="384">
+              <caret line="183" column="25" selection-start-line="183" selection-start-column="25" selection-end-line="183" selection-end-column="25" />
+              <folding>
+                <element signature="e#4010#4019#0" expanded="true" />
+                <element signature="e#4811#4812#0" expanded="true" />
+                <element signature="e#4856#4857#0" expanded="true" />
+                <element signature="e#4911#4912#0" expanded="true" />
+                <element signature="e#4945#4946#0" expanded="true" />
+                <element signature="e#4975#4976#0" expanded="true" />
+                <element signature="e#4999#5000#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="test.java" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/week01/src/test.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="45">
+              <caret line="3" column="5" lean-forward="true" selection-start-line="3" selection-start-column="5" selection-end-line="3" selection-end-column="5" />
+              <folding>
+                <element signature="e#64#65#0" expanded="true" />
+                <element signature="e#114#115#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/week01/src/main.java" />
+        <option value="$PROJECT_DIR$/week01/src/test.java" />
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+              <item name="Week_01" type="462c0819:PsiDirectoryNode" />
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+      <module name="week01" />
+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
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+    <configuration default="true" type="JUnit" factoryName="JUnit">
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="PACKAGE_NAME" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="METHOD_NAME" />
+      <option name="TEST_OBJECT" value="class" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="PARAMETERS" />
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+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
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+    <configuration default="true" type="TestNG" factoryName="TestNG">
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+      <option name="METHOD_NAME" />
+      <option name="GROUP_NAME" />
+      <option name="TEST_OBJECT" value="CLASS" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="PARAMETERS" />
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+      <option name="OUTPUT_DIRECTORY" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
+        <value defaultName="singleModule" />
+      </option>
+      <option name="USE_DEFAULT_REPORTERS" value="false" />
+      <option name="PROPERTIES_FILE" />
+      <properties />
+      <listeners />
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="Application.test" />
+      </list>
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+  <component name="SvnConfiguration">
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+  <component name="TaskManager">
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+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1597582841691</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="145" y="23" width="1424" height="827" extended-state="0" />
+    <editor active="true" />
+    <layout>
+      <window_info anchor="right" id="Palette" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="bottom" id="FindBugs-IDEA" />
+      <window_info anchor="bottom" id="Messages" visible="true" weight="0.32956153" />
+      <window_info anchor="right" id="Palette&#9;" />
+      <window_info id="Image Layers" />
+      <window_info anchor="right" id="Capture Analysis" />
+      <window_info anchor="bottom" id="Event Log" side_tool="true" />
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+      <window_info id="Capture Tool" />
+      <window_info id="Designer" />
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+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info id="UI Designer" />
+      <window_info anchor="right" id="Theme Preview" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info id="Favorites" side_tool="true" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
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+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+      <window_info anchor="bottom" id="Message" order="0" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+    </layout>
+  </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/week01/src/test.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="45">
+          <caret line="3" column="5" lean-forward="true" selection-start-line="3" selection-start-column="5" selection-end-line="3" selection-end-column="5" />
+          <folding>
+            <element signature="e#64#65#0" expanded="true" />
+            <element signature="e#114#115#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
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+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="120">
+          <caret line="8" lean-forward="true" selection-start-line="8" selection-end-line="8" />
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+      </provider>
+    </entry>
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/week01/src/HomeWorkCyq.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="384">
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+          </folding>
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ArtifactsStructureConfigurable.UI">
+        <settings>
+          <artifact-editor />
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="Copyright.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="FacetStructureConfigurable.UI">
+        <settings>
+          <last-edited>No facets are configured</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="GlobalLibrariesConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="JdkListConfigurable.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ModuleStructureConfigurable.UI">
+        <settings>
+          <last-edited>week01</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+                <option value="0.6" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectLibrariesConfigurable.UI">
+        <settings>
+          <last-edited>KotlinJavaRuntime</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ScopeChooserConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_01/README.md b/Week_01/README.md
index 50de304..114762a 100644
--- a/Week_01/README.md
+++ b/Week_01/README.md
@@ -1 +1,20 @@
-学习笔记
\ No newline at end of file
+学习笔记
+
+本周作业
+
+简单：
+用 add first 或 add last 这套新的 API 改写 Deque 的代码 --没思路
+分析 Queue 和 Priority Queue 的源码
+删除排序数组中的重复项（Facebook、字节跳动、微软在半年内面试中考过）--做过3遍忘记了
+旋转数组（微软、亚马逊、PayPal 在半年内面试中考过）--抄了一遍
+合并两个有序链表（亚马逊、字节跳动在半年内面试常考）--抄了一遍
+合并两个有序数组（Facebook 在半年内面试常考）--抄了一遍
+两数之和（亚马逊、字节跳动、谷歌、Facebook、苹果、微软在半年内面试中高频常考）--有错误
+移动零（Facebook、亚马逊、苹果在半年内面试中考过）--记忆写出来的
+加一（谷歌、字节跳动、Facebook 在半年内面试中考过）----抄了一遍
+
+中等：
+设计循环双端队列（Facebook 在 1 年内面试中考过）--没思路。抄了一遍
+
+困难：
+接雨水（亚马逊、字节跳动、高盛集团、Facebook 在半年内面试常考）--看着和盛最多的水有点像，但是不会，抄了一遍
\ No newline at end of file
diff --git a/Week_01/week01/src/HomeWorkCyq.java b/Week_01/week01/src/HomeWorkCyq.java
new file mode 100644
index 0000000..5457b28
--- /dev/null
+++ b/Week_01/week01/src/HomeWorkCyq.java
@@ -0,0 +1,243 @@
+import java.util.Stack;
+
+public class HomeWorkCyq {
+    /*
+    * 1.ɾ�����������е��ظ���
+    * */
+    public int deleteRepeat(int[] nums){
+
+        if(nums.length == 0 ){
+            return 0;
+        }
+        if(nums.length == 1){
+            return 1;
+        }
+        int i = 0;
+        for(int j=1 ; j<nums.length; j++){
+            if(nums[i] == nums[j]){
+                continue;;
+            }else {
+                i++;
+                nums[i]=nums[j];
+            }
+        }
+        return i+1;
+//        for(int i = 0;i<nums.length; i++){
+//            for(int j = 0;j<nums.length;j++){
+//                if(nums[j] == nums[i]){
+//                    j=i;
+//                }
+//            }
+//        }
+    }
+    /*
+    * 2.��ת����
+    * */
+    public void rotate(int[] nums, int k){
+        if(nums.length == 0 || k == 0){
+            return;
+        }
+        int temp=0,pre=0;
+        for(int i =0 ;i<k;i++){
+            pre = nums[nums.length-1];
+            for( int j =0 ;j<nums.length;j++){
+                temp = nums[j];
+                nums[j] = pre;
+                pre =temp;
+
+            }
+        }
+    }
+    /*
+    * 3.�ϲ�������������
+    * */
+    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; }
+  }
+    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
+        //���������������Ƚ�����������������Ԫ�ش�С���½�һ������
+        if(l1 == null){
+            return l2;
+        }else if( l2 == null){
+            return l1;
+        }else if(l1.val<l2.val){
+            l1.next = mergeTwoLists(l1.next,l2);
+            return l1;
+        }else{
+            l2.next = mergeTwoLists(l1,l2.next);
+            return l2;
+        }
+
+    }
+    /*
+    * �ϲ�������������
+    * */
+
+    public void merge(int[] nums1, int m, int[] nums2, int n){
+        int len1 = m-1;
+        int len2 = n-1;
+        int len = m+n-1;
+        while (len1 >= 0 && len2 >= 0){
+            nums1[len--] = nums1[len1]>nums2[len2]?nums1[len1--]:nums2[len2--];
+        }
+        System.arraycopy(nums2,0,nums1,0,len2+1);
+    }
+
+    /*
+    * 5.����֮��
+    * */
+    public int[] twoSum(int[] nums, int target){
+        if(nums.length == 0){
+            return null;
+        }
+        int[] res = new int[];
+        for(int i = 0;i<nums.length;i++){
+            for( int j=i;j<nums.length;j++){
+                if(nums[j] == target - nums[i]){
+                    res[0]=i;
+                    res[1]=j;
+                    return res;
+                }
+            }
+        }
+    }
+
+    /*
+    *6. �ƶ���
+    * */
+    public void moveZeroes(int[] nums){
+        if(nums.length ==0){
+            return;
+        }
+        int j = 0;
+        for(int i = 0;i<nums.length;i++){
+            if(0 != nums[i]){
+                nums[j] = nums[i];
+                if(i!=j){
+                    nums[i]=0;
+                }
+                j++;
+            }
+        }
+//        for(int i = 0; i<nums.length;i++){
+//            if(0 != nums[i]){
+//                nums[j]=nums[i];
+//                j++;
+//            }
+//        }
+//        for(int i=j;i<nums.length;i++){
+//            nums[i]=0;
+//        }
+    }
+
+    /*
+    * 7.��һ
+    * */
+    public int[] plusOne(int[] digits){
+        //�����������9���ڽ�λ
+        for(int i = digits.length -1; i >= 0; i--){
+            digits[i]++;
+            digits[i] %= 10;
+            if(digits[i] != 0){
+                return digits;
+            }
+        }
+        digits = new int[digits.length + 1];
+        digits[0] = 1;
+        return digits;
+//        if(digits == [0]){
+//            return [1];
+//        }
+//
+//        for(int i = 0 ; i<digits.length;i++){
+//            if(digits[digits.length-1] != 9){
+//                digits[digits.length-1]++;
+//            }else{
+//
+//            }
+//        }
+    }
+
+
+    /*
+    * ����ˮ
+    * */
+    public int trap(int[] A){
+        if(A == null || A.length == 0){
+            return 0;
+        }
+        Stack<Integer> s = new Stack<Integer>();
+        int i = 0, maxWater = 0, maxBotWater = 0;
+        while(i<A.length){
+            if(s.isEmpty() || A[i]<=A[s.peek()]){
+                s.push(i++);
+            }else{
+                int bot = s.pop();
+                maxBotWater = s.isEmpty()?0:(Math.min(A[s.peek(),A[i]]-A[bot])*(i-s.peek()-1));
+                maxWater += maxBotWater;
+            }
+        }
+        return  maxWater;
+    }
+
+
+}
+/*
+ *���ѭ��˫�˶���
+ * */
+class MyCircularDeuqe {
+    private  int[] data;
+    private  int head;
+    private  int tail;
+    private int capacity;
+    //��ʼ��
+    public  MyCircularDeuqe(int k){
+        data = new int[k+1];
+        capacity = k+1;
+    }
+    //
+    public boolean insertFront(int value){
+        if(isFull()){
+            return false;
+        }
+        data[head = ((head-1+capacity)%capacity)] =value;
+        return true;
+    }
+    //
+    public boolean insertLast(int value){
+        if(isFull()){
+            return false;
+        }
+        data[tail]=value;
+        tail =(tail+1)%capacity;
+        return true;
+    }
+    public boolean deleteLast(){
+        if(isEmpty()){
+            return false;
+        }
+        head = (head+1)%capacity;
+        return true;
+    }
+    public boolean deleteLast(){
+        if(isEmpty()){
+            return false;
+        }
+        tail = (tail-1+capacity)%capacity;
+        return true;
+    }
+    //
+    public int getRear(){
+        return  isEmpty()? -1:data[(tail-1+capacity)%capacity]
+    }
+    public  boolean isEmpty(){
+        return head == tail;
+    }
+    public boolean isFull(){
+        return (tail+1)%capacity == head;
+    }
+}
\ No newline at end of file
diff --git a/Week_01/week01/src/ModifyDequeByAdd.java b/Week_01/week01/src/ModifyDequeByAdd.java
new file mode 100644
index 0000000..cebe589
--- /dev/null
+++ b/Week_01/week01/src/ModifyDequeByAdd.java
@@ -0,0 +1,8 @@
+import java.util.Deque;
+
+public class ModifyDequeByAdd extends Deque {
+    //�� add first �� add last �����µ� API ��д Deque �Ĵ���
+    public void addFirst(){
+
+    }
+}
diff --git a/Week_01/week01/src/test.java b/Week_01/week01/src/test.java
new file mode 100644
index 0000000..a4143bd
--- /dev/null
+++ b/Week_01/week01/src/test.java
@@ -0,0 +1,5 @@
+public class  test {
+    public static void main(String args[]) {
+        System.out.println("Hello World!");
+    }
+}
diff --git a/Week_01/week01/week01.iml b/Week_01/week01/week01.iml
new file mode 100644
index 0000000..3cd0ed1
--- /dev/null
+++ b/Week_01/week01/week01.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>
\ No newline at end of file

From 9f16ee214d9a0264b527178098aa50ae16e57fcd Mon Sep 17 00:00:00 2001
From: "yanquan.cyq" <devel89@sina.cn>
Date: Mon, 24 Aug 2020 00:13:07 +0800
Subject: [PATCH 4/6] week02 cyq

---
 .idea/dictionaries/devel.xml                 |   3 +
 .idea/inspectionProfiles/Project_Default.xml |  36 ++++
 .idea/vcs.xml                                |   6 +
 Week_02/README.md                            |  70 +++++++-
 Week_02/src/HomeWorkCyq.java                 | 172 +++++++++++++++++++
 Week_02/src/test.java                        |   5 +
 6 files changed, 291 insertions(+), 1 deletion(-)
 create mode 100644 .idea/dictionaries/devel.xml
 create mode 100644 .idea/inspectionProfiles/Project_Default.xml
 create mode 100644 .idea/vcs.xml
 create mode 100644 Week_02/src/HomeWorkCyq.java
 create mode 100644 Week_02/src/test.java

diff --git a/.idea/dictionaries/devel.xml b/.idea/dictionaries/devel.xml
new file mode 100644
index 0000000..dd319fa
--- /dev/null
+++ b/.idea/dictionaries/devel.xml
@@ -0,0 +1,3 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="devel" />
+</component>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
new file mode 100644
index 0000000..6560a98
--- /dev/null
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,36 @@
+<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/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Week_02/README.md b/Week_02/README.md
index 50de304..b9770ae 100644
--- a/Week_02/README.md
+++ b/Week_02/README.md
@@ -1 +1,69 @@
-学习笔记
\ No newline at end of file
+学习笔记
+1.HashMap的小结
+1.1 大背景：先说一下java中的集合"List、Set、Map"，继承结构如下，Map没有继承Collection
+Collection
+├List
+│├LinkedList，LinkedList实现了List接口，允许null元素。此外LinkedList提供额外的get，remove，insert方法在 LinkedList的首部或尾部。这些操作使LinkedList可被用作堆栈（stack），队列（queue）或双向队列（deque）。特点是寻址困难、插入和删除容易
+│├ArrayList，ArrayList实现了可变大小的数组(允许null)
+│└Vector Vector非常类似ArrayList，但是Vector是同步的。由Vector创建的Iterator，虽然和ArrayList创建的 Iterator是同一接口，但是，因为Vector是同步的，当一个Iterator被创建而且正在被使用，另一个线程改变了Vector的状态（例 如，添加或删除了一些元素），这时调用Iterator的方法时将抛出ConcurrentModificationException，因此必须捕获该 异常。
+│　└Stack Stack继承自Vector，实现一个后进先出的堆栈。Stack提供5个额外的方法使得 Vector得以被当作堆栈使用。基本的push和pop 方法，还有peek方法得到栈顶的元素，empty方法测试堆栈是否为空，search方法检测一个元素在堆栈中的位置。Stack刚创建后是空栈。
+└Set
+ |-HashSet 基于Hash算法实现，性能优于TreeSet；不允许出现重复元素；不保证集合顺序；允许null元素但由于不重复性最多允许一个；不同步的
+ └TreeSet 按照升序排列，根据构造方法的不同实现，肯能会按照元素的自然顺序排序，或者按照创建set时所提供的比较器进行排序。
+LinkedList和ArrayList的区别：1、ArrayList的实现是基于数组，LinkedList的实现是基于双向链表。2、对于随机访问，ArrayList优于LinkedList 3、对于插入和删除操作，LinkedList优于ArrayList 4、LinkedList比ArrayList更占内存，因为LinkedList的节点除了存储数据，还存储了两个引用，一个指向前一个元素，一个指向后一个元素。
+Map
+├Hashtable 1.Hashtable继承Map接口，实现一个key-value映射的哈希表。任何非空（non-null）的对象都可作为key或者value。添加数据使用put(key, value)，取出数据使用get(key)，这两个基本操作的时间开销为常数。2.Hashtable 通过initial capacity和load factor两个参数调整性能。通常缺省的load factor 0.75较好地实现了时间和空间的均衡。增大load factor可以节省空间但相应的查找时间将增大，这会影响像get和put这样的操作。3.作为key的对象将通过计算其散列函数来确定与之对应的value的位置，因此任何作为key的对象都必须实现hashCode和equals方法。4.Hashtable是同步的。
+├HashMap HashMap和Hashtable类似，不同之处在于HashMap是非同步的，并且允许null（即null value和null key）。capacity和load factor两个参数影响性能
+└WeakHashMap WeakHashMap是一种改进的HashMap，它对key实行“弱引用”，如果一个key不再被外部所引用，那么该key可以被GC回收。
+
+HashMap的两种遍历方式，推荐使用entrySet（效率高）.
+Map map = new HashMap();
+　　     Iterator iter = map.entrySet().iterator();
+　　     while (iter.hasNext()) {
+　　     Map.Entry entry = (Map.Entry) iter.next();
+　　     Object key = entry.getKey();
+　　     Object val = entry.getValue();
+　　}
+Map map = new HashMap();
+  　　Iterator iter = map.keySet().iterator();
+  　　while (iter.hasNext()) {
+  　　Object key = iter.next();
+  　　Object val = map.get(key);
+  　　}
+1.2 小背景
+java.util.Map 接口，分别被AbstractMap、SortedMap、Hashtable(同时继承自Dictionary)实现；分别被AbstractMap被HashMap继承，LikedHashMap又继承自HashMap，TreeMap继承自AbstractMap同时实现了NavigableMap接口(继承自SortedMap)
+
+(1) HashMap：它根据键的hashCode值存储数据，大多数情况下可以直接定位到它的值，因而具有很快的访问速度，但遍历顺序却是不确定的。 HashMap最多只允许一条记录的键为null，允许多条记录的值为null。HashMap非线程安全，即任一时刻可以有多个线程同时写HashMap，可能会导致数据的不一致。如果需要满足线程安全，可以用 Collections的synchronizedMap方法使HashMap具有线程安全的能力，或者使用ConcurrentHashMap。
+(2) Hashtable：Hashtable是遗留类，很多映射的常用功能与HashMap类似，不同的是它承自Dictionary类，并且是线程安全的，任一时间只有一个线程能写Hashtable，并发性不如ConcurrentHashMap，因为ConcurrentHashMap引入了分段锁。Hashtable不建议在新代码中使用，不需要线程安全的场合可以用HashMap替换，需要线程安全的场合可以用ConcurrentHashMap替换。
+(3) LinkedHashMap：LinkedHashMap是HashMap的一个子类，保存了记录的插入顺序，在用Iterator遍历LinkedHashMap时，先得到的记录肯定是先插入的，也可以在构造时带参数，按照访问次序排序。
+(4) TreeMap：TreeMap实现SortedMap接口，能够把它保存的记录根据键排序，默认是按键值的升序排序，也可以指定排序的比较器，当用Iterator遍历TreeMap时，得到的记录是排过序的。如果使用排序的映射，建议使用TreeMap。在使用TreeMap时，key必须实现Comparable接口或者在构造TreeMap传入自定义的Comparator，否则会在运行时抛出java.lang.ClassCastException类型的异常。
+
+1.3 HashMap分析
+hashmap中存储的是健值对，从源码的结构看，Hash桶数组中存储的是Node对象(健值对的映射)。当存储Node到数组中时候通过hashCode()方法用key对数组长度取膜，发生Hash碰撞(多个不同key经过hashcode之后需要放在数组的同一个位置)则在数组当前位置扩展出来链表，当链表长度大于8时候转换成红黑树。
+
+static class Node<K,V> implements Map.Entry<K,V> {
+        final int hash;    //用来定位数组索引位置
+        final K key;
+        V value;
+        Node<K,V> next;   //链表的下一个node
+
+        Node(int hash, K key, V value, Node<K,V> next) { ... }
+        public final K getKey(){ ... }
+        public final V getValue() { ... }
+        public final String toString() { ... }
+        public final int hashCode() { ... }
+        public final V setValue(V newValue) { ... }
+        public final boolean equals(Object o) { ... }
+}
+// HashMap默认构造函数源码
+int threshold;             // 所能容纳的key-value对极限 threshold = length * Load factor，Node[] table的初始化长度length(默认值是16，这个值总是2的n次方)，Load factor为负载因子(默认值是0.75)
+final float loadFactor;    // 负载因子，平衡空间和时间的因子，如果内存空间很多而又对时间效率要求很高，可以降低负载因子Load factor的值；相反，如果内存空间紧张而对时间效率要求不高，可以增加负载因子loadFactor的值，这个值可以大于1。
+int modCount;              //用来记录HashMap内部结构发生变化的次数，主要用于迭代的快速失败。强调一点，内部结构发生变化指的是结构发生变化，例如put新键值对，但是某个key对应的value值被覆盖不属于结构变化。
+int size;                  //是HashMap中实际存在的键值对数量
+
+当length总是2的n次方时，h& (length-1)运算等价于对length取模，也就是h%length，但是&比%具有更高的效率。"在JDK1.8的实现中，优化了高位运算的算法，通过hashCode()的高16位异或低16位实现的：(h = k.hashCode()) ^ (h >>> 16)，主要是从速度、功效、质量来考虑的，这么做可以在数组table的length比较小的时候，也能保证考虑到高低Bit都参与到Hash的计算中，同时不会有太大的开销。"没太理解其好处
+
+
+
+
+
diff --git a/Week_02/src/HomeWorkCyq.java b/Week_02/src/HomeWorkCyq.java
new file mode 100644
index 0000000..bd5f84d
--- /dev/null
+++ b/Week_02/src/HomeWorkCyq.java
@@ -0,0 +1,172 @@
+import java.util.Stack;
+
+/**
+ * �ڶ�����ҵ
+ * 1.дһ������ HashMap ��С�ܽᡣ
+ * �ReadME.md��
+ * 2.��Ч����ĸ��λ�ʣ�����ѷ��Facebook���ȸ��ڰ����������п�����
+ * 3.����֮�ͣ��������ڣ�����ѷ�������ﵽ 216 �Ρ��ֽ����� 147 �Ρ��ȸ� 104 �Σ�Facebook��ƻ����΢������ѶҲ�ڽ����������Գ�����
+ * 4.N ������ǰ�����������ѷ�ڰ����������п�����
+ * 5.HeapSort ����ѧ https://www.geeksforgeeks.org/heap-sort/
+ * �еȣ�
+ * 1.��ĸ��λ�ʷ��飨����ѷ�ڰ����������г�����
+ * 2.���������������������ѷ���ֽ�������΢���ڰ����������п�����
+ * 3.��������ǰ��������ֽ��������ȸ衢��Ѷ�ڰ����������п�����
+ * 4.N �����IJ������������ѷ�ڰ����������п�����
+ * 5.�������ֽ������ڰ����������п�����
+ * 6.ǰ K ����ƵԪ�أ�����ѷ�ڰ����������г�����
+ * ����Ԥϰ
+ * Ԥϰ��Ŀ��
+ * 1.��¥��
+ * 2.��������
+ * 3.Pow(x, n)
+ * 4.�Ӽ�
+ * 5.N �ʺ�
+ */
+public class HomeWorkCyq {
+    /**
+     *2.��Ч����ĸ��λ��
+     */
+    public boolean isAnagram(String s, String t) {
+        if (s.length() != t.length()) {
+            return false;
+        }
+        char[] str1 = s.toCharArray();
+        char[] str2 = t.toCharArray();
+
+        Arrays.sort(str1);
+        Arrays.sort(str2);
+
+        return Arrays.euqals(str1, str2);
+    }
+    /**
+     * ����֮��
+     */
+    public int[] twoSum(int[] nums, int target) {
+        if(nums.length == 0){
+            return null;
+        }
+        //hashmap
+        HashMap<Integer,Integer> mp = new HashMap<>();
+        int[] res = new int[2];
+        for(int i=0;i<nums.length;i++){
+            if(mp.containsKey(target-nums[i])){
+                // res[0]=i;
+                // res[1]=mp.get(target-nums[i]);
+                //return res;
+                return new int[]{mp.get(target-numsp[i]),i};
+            }else{
+                mp.put(nums[i],i);
+            }
+        }
+        throw new IllegalArgumentException("no");
+    }
+
+    /**
+     * N ������ǰ�����
+     * ʹ��һ��ջ���������ǵõ�ǰ���������Ҫ��֤ջ���Ľڵ���ǵ�ǰ�������Ľڵ㡣
+     * ���ȰѸ��ڵ���ջ����Ϊ���ڵ���ǰ������еĵ�һ���ڵ㡣
+     * ���ÿ�����Ǵ�ջ��ȡ��һ���ڵ� u���������ǵ�ǰ�������Ľڵ㣬���� u �������ӽڵ���������ջ�С�
+     * ���� u ���ӽڵ������Ϊ v1, v2, v3����ô����ջ��˳��Ӧ��Ϊ v3, v2, v1�������ͱ�֤����һ���������Ľڵ㣨�� u �ĵ�һ���ӽڵ� v1��������ջ����λ�á�
+     *
+     */
+    public List<Integer> preorder(Node root) {
+        List<Integer> res = new LinkedList<>();
+        Stack<Node> stack = new Stack<>();
+        if(root == null){
+            return res;
+        }
+        while(!stack.isEmpty()){
+            Node cur = stack.pop();
+            res.add(cur.val);
+            for(int i=cur.children.size()-1;i>=0;i--){
+                stack.push(cur.children.get(i));
+            }
+        }
+        return res;
+    }
+
+    /**
+     * ��ĸ��λ�ʷ���
+     */
+    public List<List<String>> groupAnagrams(String[] strs) {
+        HashMap<String,List<String>> hp = new HashMap<>();
+        for(int i = 0;i < strs.length;i++){
+            char[] s_arr = strs[i].toCharArray();
+            //����
+            Arrays.sort(s_arr);
+            //ӳ��
+            Sting key = String.value(s_arr);
+            if(hp.containsKey(key){
+                hp.get(key).add(strs[i]);
+            }else{
+                List<String> l = new LinkedList<>();
+                l.add(strs[i]);
+                hp.put(key,l);
+            }
+        }
+        return new ArrayList<List<String>>(hp.values());
+//        if(strs.length == null) return new int[0];
+//        List<Integer,List<String>> l = new ArrayList<>();
+//        for(int i=0;i<strs.length;i++){
+//            char[] s_arr = strs[i].toCharArray();
+//            //����
+//            Arrays.sort(s_arr);
+//
+//            //��ӳ��
+//            String value = String.valueOf(s_arr);
+//            if(value == s.arr[i]){
+//                l.add(s_arr[i]);
+//            }else if(){
+//                l.push(i,s_arr[i]);
+//            }
+//
+//
+//        }
+//        return  l;
+    }
+
+    /**
+     * ���������������
+     */
+    public List<Integer> inorderTraversal(TreeNode root) {
+        List<Integer> res = new ArrayList<Integer>();
+        TreeNode pre =null;
+        while(root != null){
+            if(root.left != null){
+                pre = root.left;
+                while(pre.right != null){
+                    pre= pre.right;
+                }
+                pre.right = root;
+                TreeNode temp =root;
+                root = root.left;
+                temp.left = null;
+            }else{
+                res.add(root.val);
+                root = root.right;
+            }
+        }
+        return res;
+    }
+
+    /**
+     * N�������������
+     */
+
+    /**
+     * ����
+     * */
+    public int nthUglyNumber(int n) {
+
+    }
+
+    /**
+     * ǰ K ����ƵԪ��
+     */
+    public int[] topKFrequent(int[] nums, int k) {
+
+    }
+
+}
+
diff --git a/Week_02/src/test.java b/Week_02/src/test.java
new file mode 100644
index 0000000..a4143bd
--- /dev/null
+++ b/Week_02/src/test.java
@@ -0,0 +1,5 @@
+public class  test {
+    public static void main(String args[]) {
+        System.out.println("Hello World!");
+    }
+}

From 8de37c51414b57679435768c88ecd12b8a3cee83 Mon Sep 17 00:00:00 2001
From: "yanquan.cyq" <devel89@sina.cn>
Date: Mon, 31 Aug 2020 00:10:40 +0800
Subject: [PATCH 5/6] =?UTF-8?q?=E7=AC=AC=E5=9B=9B=E5=91=A8=E4=BD=9C?=
 =?UTF-8?q?=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .idea/kotlinc.xml                         |  10 +
 .idea/libraries/KotlinJavaRuntime.xml     |  19 ++
 .idea/libraries/KotlinJavaRuntime__2_.xml |  19 ++
 Week_02/src/HomeWorkCyq.java              |   2 +-
 Week_03/README.md                         |  15 +-
 Week_03/Week_03.iml                       |  12 +
 Week_03/src/Solution.java                 |  42 ++++
 Week_04/README.md                         |  36 ++-
 Week_04/src.iml                           |  12 +
 Week_04/src/HomeWork.java                 | 259 ++++++++++++++++++++++
 10 files changed, 423 insertions(+), 3 deletions(-)
 create mode 100644 .idea/kotlinc.xml
 create mode 100644 .idea/libraries/KotlinJavaRuntime.xml
 create mode 100644 .idea/libraries/KotlinJavaRuntime__2_.xml
 create mode 100644 Week_03/Week_03.iml
 create mode 100644 Week_03/src/Solution.java
 create mode 100644 Week_04/src.iml
 create mode 100644 Week_04/src/HomeWork.java

diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
new file mode 100644
index 0000000..3c50bd3
--- /dev/null
+++ b/.idea/kotlinc.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JvmCompilerArguments">
+    <option name="jvmTarget" value="1.8" />
+  </component>
+  <component name="KotlinCommonCompilerArguments">
+    <option name="apiVersion" value="1.2" />
+    <option name="languageVersion" value="1.2" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/libraries/KotlinJavaRuntime.xml b/.idea/libraries/KotlinJavaRuntime.xml
new file mode 100644
index 0000000..1a7265d
--- /dev/null
+++ b/.idea/libraries/KotlinJavaRuntime.xml
@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="KotlinJavaRuntime">
+    <CLASSES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/.idea/libraries/KotlinJavaRuntime__2_.xml b/.idea/libraries/KotlinJavaRuntime__2_.xml
new file mode 100644
index 0000000..a626dfe
--- /dev/null
+++ b/.idea/libraries/KotlinJavaRuntime__2_.xml
@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="KotlinJavaRuntime (2)">
+    <CLASSES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/Week_02/src/HomeWorkCyq.java b/Week_02/src/HomeWorkCyq.java
index bd5f84d..e960f19 100644
--- a/Week_02/src/HomeWorkCyq.java
+++ b/Week_02/src/HomeWorkCyq.java
@@ -54,7 +54,7 @@ public int[] twoSum(int[] nums, int target) {
                 // res[0]=i;
                 // res[1]=mp.get(target-nums[i]);
                 //return res;
-                return new int[]{mp.get(target-numsp[i]),i};
+                return new int[]{mp.get(target-nums[i]),i};
             }else{
                 mp.put(nums[i],i);
             }
diff --git a/Week_03/README.md b/Week_03/README.md
index 50de304..4e73461 100644
--- a/Week_03/README.md
+++ b/Week_03/README.md
@@ -1 +1,14 @@
-学习笔记
\ No newline at end of file
+学习笔记
+递归：4步骤：终结条件-》处理当前层逻辑-〉下钻下一层逻辑-》清扫当前层
+    找最近重复子问题，找最间断的原型（不漏且不重复）
+    模版
+   Public void recur(int level,int param){
+    if（level > MAX_LEVEL）{
+        return;
+    }
+
+    process(level,param);
+
+    recur(level:level+1;newParam);
+
+   }
diff --git a/Week_03/Week_03.iml b/Week_03/Week_03.iml
new file mode 100644
index 0000000..245d342
--- /dev/null
+++ b/Week_03/Week_03.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/Week_03/src/Solution.java b/Week_03/src/Solution.java
new file mode 100644
index 0000000..d4262a3
--- /dev/null
+++ b/Week_03/src/Solution.java
@@ -0,0 +1,42 @@
+import java.util.ArrayList;
+import java.util.List;
+
+class Solution {
+    public List<String> generateParenthesis(int n) {
+        //�ȿ���2n���ӷ�����
+        //�ڿɿ���������Ч��
+        ArrayList<String > res = new ArrayList<String>();
+        _generator(0, 0, n, "");
+        //_generator(0,n, "");
+        return res;
+    }
+
+//    private void _generator(int level, int max, String s) {
+    private void _generator(int left, int right, int n, String s) {
+        //terminate
+        if(left == n && right ==n ){
+            System.out.println(s);
+            return;;
+        }
+        //process
+//        String s1 = s + "(";
+//        String s2 = s + ")";
+
+        //drill donw
+//        _generator(level+1,max,s+"(");
+////        _generator(level+1,max,s+")");
+        if(left < n){
+            _generator(left+1,right,n,s+"(");
+        }
+        if(left > right ){
+            _generator(left,right+1,n,s+")");
+        }
+
+        //revers
+    }
+
+    public static void main(String[] args){
+        Solution sol = new Solution();
+        System.out.println(sol.generateParenthesis(3));
+    }
+}
\ No newline at end of file
diff --git a/Week_04/README.md b/Week_04/README.md
index 50de304..8873942 100644
--- a/Week_04/README.md
+++ b/Week_04/README.md
@@ -1 +1,35 @@
-学习笔记
\ No newline at end of file
+学习笔记
+*寻找最近可重复项，就可以考虑递归、分治和回溯
+1.递归
+模版
+public void recur(int level, int param) {
+  // 1.terminator  --终结条件
+  if (level > MAX_LEVEL) {
+    // process result
+    return;
+  }
+  // 2.process current logic --当前处理逻辑
+  process(level, param);
+  // 3.drill down --下钻
+  recur( level: level + 1, newParam);
+  // 4.restore current status --清空状态，如果是全局变量或者入参的清空下需要清空
+
+}
+2.分治
+private static int divide_conquer(Problem problem) {
+  //1.terminal ---终结条件
+  if (problem == NULL) {
+    int res = process_last_result();
+    return res;
+  }
+  //2.大问题分解为子问题
+  subProblems = split_problem(problem)
+  //3.分别处理每一个子问题
+  res0 = divide_conquer(subProblems[0])
+  res1 = divide_conquer(subProblems[1])
+  //4.合并
+  result = process_result(res0, res1);
+
+  return result;
+}
+3.回溯，当下一层不符合期望的时候，回退上一层的结果并重新开始新一轮遍历
\ No newline at end of file
diff --git a/Week_04/src.iml b/Week_04/src.iml
new file mode 100644
index 0000000..4a3ded1
--- /dev/null
+++ b/Week_04/src.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime (2)" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/Week_04/src/HomeWork.java b/Week_04/src/HomeWork.java
new file mode 100644
index 0000000..bf207ac
--- /dev/null
+++ b/Week_04/src/HomeWork.java
@@ -0,0 +1,259 @@
+import javax.swing.tree.TreeNode;
+import java.util.*;
+
+public class HomeWork {
+/**
+ * 1.�������������������
+ * ����һ�����������ҵ����������ڵ������������ȣ��ڵ�������Լ�������
+ * ˼·������ͨ���ݹ�Զ��������к���������������ڵ� pp �� qq ʱ���ء��ӵ��������ݣ����ڵ� p, qp,q �ڽڵ� rootroot �����ʱ(���ֱ������������У�)���ڵ� rootroot ��Ϊ����������ȣ������Ϸ��� rootroot ��
+ *��ֹ������
+ * ��Խ��Ҷ�ڵ㣬��ֱ�ӷ��� null ��
+ * �� root ���� p, q����ֱ�ӷ��� root ��
+ * ���ƹ�����
+ * �����ݹ����ӽڵ㣬����ֵ��Ϊ leftleft ��
+ * �����ݹ����ӽڵ㣬����ֵ��Ϊ rightright ��
+ * ����ֵ�� ���� leftleft �� rightright ����չ��Ϊ���������
+ * �� leftleft �� rightright ͬʱΪ�� ��˵�� rootroot ���� / �������ж������� p,qp,q ������ nullnull ��
+ * �� leftleft �� rightright ͬʱ��Ϊ�� ��˵�� p, qp,q ������ rootroot �� ��� ���ֱ��� �� / ������������� rootroot Ϊ����������ȣ����� rootroot ��
+ * �� leftleft Ϊ�� ��rightright ��Ϊ�� ��p,qp,q ������ rootroot ���������У�ֱ�ӷ��� rightright ������ɷ�Ϊ���������
+ * p,qp,q ����һ���� rootroot �� ������ �У���ʱ rightright ָ�� pp������Ϊ pp ����
+ * p,qp,q ���ڵ㶼�� rootroot �� ������ �У���ʱ�� rightright ָ�� ����������Ƚڵ� ��
+ * �� leftleft ��Ϊ�� �� rightright Ϊ�� ������� 3. ͬ����
+ *
+ * /
+ /**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode(int x) { val = x; }
+ * }
+ */
+
+    public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
+
+        //1.terminal
+        if(root == null ||root == p || root == q){
+            return root;
+        }
+        //2.current logical
+        TreeNode left = lowestCommonAncestor(root.left,p,q);
+        TreeNode right = lowestCommonAncestor(root.right,p,q);
+        //3.drill down
+        if(left == null && right ==null ){
+            return  null;
+        }
+        if(left == null){
+            return right;
+        }
+        if(right == null){
+            return left;
+        }
+        return root;
+        //4.reverse state
+    }
+
+    /**
+     * 2.��ǰ���������������й��������������û���ظ�Ԫ��
+     * ǰ����� preorder = [3,9,20,15,7]
+     * ������� inorder = [9,3,15,20,7]
+     * ˼·��
+     * ǰ��������ص��ǣ� ���ڵ� ʼ�ճ���������ĵ�һλ������������� ���ڵ� ������������м�λ�á�
+     * ��������������������飬�������ǾͿ���ƴ�� ���ڵ㣬������ 1��
+     * ��Ŀ����˵�������в������ظ�Ԫ�أ���ô�� 1 �Ϳ��Զ�λ������������м�λ�ã����������� 1 ��ߵIJ��־�����������1 �ұ߲��־�����������
+     *ǰ������� ����������+���ڵ� �� 1,2,4,5����������� ����������+���ڵ� �� 4,2,5,1�������ߵ����鳤����һ���ġ�
+     * ���ǿ��Ը�������������м�λ�� 1����ȷ��ǰ����������Ҳ��֣�����ǰ�������һ���Ǹ��ڵ㣬
+     * ��������߲����ǣ�[1:mid_index]���Ұ벿���� [mid_index+1:]
+     * ����� mid_index ������������м��±�λ�á�
+     * �ݹ麯��ʵ�����£�
+     * ��ֹ����:ǰ�����������Ϊ��
+     * ����ǰ�������һ��Ԫ�أ�ƴ�����ڵ㣬�ٽ�ǰ���������������ֳ����룬�ݹ�Ĵ���ǰ��������ߺ�����������ߣ��ݹ�Ĵ���ǰ�������ұߺ����������ұߡ�
+     */
+    /**
+     * Definition for a binary tree node.
+     * public class TreeNode {
+     *     int val;
+     *     TreeNode left;
+     *     TreeNode right;
+     *     TreeNode(int x) { val = x; }
+     * }
+     */
+    public TreeNode buildTree(int[] preorder, int[] inorder) {
+        //1.terminal
+        if(preorder.length == 0 || inorder.length == 0){
+            return null;
+        }
+        //����ǰ�������һ��Ԫ��ȷ�����ڵ�
+        TreeNode root = new TreeNode(preorder[0]);
+        //2.current logical
+        //ѭ�����������ҵ���ǰ����ȵ�Ԫ�أ������з�Ϊ��������
+        for(int i = 0;i<preorder.length;++i){
+            if(preorder[0] == inorder[i]){
+                //��ǰ������ֳ��������룬�ٽ���������ֳ���������
+                int[] pre_left = Arrays.copyOfRange(preorder,1,i+1);
+                int[] pre_right = Arrays.copyOfRange(preorder,i+1,preorder.length);
+                int[] in_left = Arrays.copyOfRange(inorder,0,i);
+                int[] in_right = Arrays.copyOfRange(inorder,i+1,inorder.length);
+                //3.drill down
+                //�ֱ����������������
+                root.left = buildTree(pre_left,in_left);
+                root.right = buildTree(pre_right,in_right);
+                break;
+            }
+        }
+
+        return root;
+
+        //4.reverse state
+    }
+    /**
+     * 3.��ϣ������������� n �� k������ 1 ... n �����п��ܵ� k ��������ϡ�
+     * ˼·������
+     * ͨ���������п��ܳ�Ա��Ѱ��ȫ�����н���㷨������ѡ ���� ���н� (�������ٲ��� ���һ�� ��)�����ݷ�����ǰһ������һЩ�޸��������ú�ѡ��������֮�� ���� ���ٴγ��ԡ�
+     * ����һ�����ݷ�������������һ�����ӵ�����е��������е������Ϊ������ backtrack(first, curr)
+     * ��������- ���ӵ�����С������� first t�� n������������������ i ���ӵ�������� curr�С�
+     * ��������������Ӹ������� ��backtrack(i + 1, curr).
+     * �� i �� curr���Ƴ���ʵ�ֻ��ݡ�
+     */
+    List<List<Integer>> output = new LinkedList();
+    int n,k;
+
+    public List<List<Integer>> combine(int n, int k) {
+        // List<List<Integer>> res = new ArrayList<>();
+        // dfs(n,k,res,0,new ArrayList<Integer>());
+        // return res;
+        this.n = n;
+        this.k = k;
+        backtrack(1,new LinkedList<Integer>());
+        return output;
+    }
+    public void backtrack(int first,LinkedList<Integer> curr){
+        //1.��ֹ����
+        if(curr.size() == k){
+            output.add(new LinkedList(curr));
+        }
+        for(int i=first;i<=n;++i){
+            //2.current logical
+            curr.add(i);
+            //3.drill down
+            backtrack(i+1,curr);
+            //4.revsers state
+            curr.removeLast();
+        }
+    }
+    // public void dfs(int n,int k,List<List<Integer>> res,int index,List<Integer> temp){
+    //     //1.terminal
+    //     if(index == n){
+    //         res.add(temp);
+    //         return;
+    //     }
+
+    //         //2.current logical
+
+    //         //3.drill down
+    //         //��ѡ������
+    //         dfs(n,k,res,index+1,temp);
+    //         //ѡ������
+
+    //         for(int i=0;i<k;i++){
+    //             temp.add(index);
+    //             ++i;
+    //         }
+    //         dfs(n,k,res,index+1,temp);
+
+    //     //4.reverse state
+    //     temp.remove(temp.size()-1);
+    // }
+    /**
+     * 4.ȫ���У�����һ�� û���ظ� ���ֵ����У����������п��ܵ�ȫ���С�
+     */
+    //���ݽ��,
+    public List<List<Integer>> permute(int[] nums) {
+        List<List<Integer>> res = new ArrayList<>();
+        int[] visit = new int[nums.length];
+        backtrack(res,nums,new ArrayList<Integer>(),visit);
+        return res;
+        // if(nums.length == 0){
+        //     return res;
+        // }
+        // dfs(nums,res,0, new LinkedList<Integer>());
+        // return res;
+
+    }
+    public void backtrack(List<List<Integer>> res,int[] nums,ArrayList<Integer> temp,int[] visit){
+        //visit��Ϊ������ӷ�ֹ�����г����ظ�������
+        if(temp.size() == nums.length){
+            res.add(new ArrayList<>(temp));
+            return;
+        }
+        for(int i=0;i<nums.length;i++){
+            if(visit[i] == 1) continue;
+            visit[i] = 1;
+            temp.add(nums[i]);
+            backtrack(res,nums,temp,visit);
+
+            visit[i] = 0;
+            temp.remove(temp.size()-1);
+
+        }
+    }
+    // public void dfs(int nums,List<List<Integer>> res,int index,List<Integer> temp){
+    //     //1.terminal
+    //     if(index == nums.length){
+    //         res.add(temp);
+    //         return;
+    //     }
+    //     //2.current logical
+
+    //     //3.drill down
+    //     //��ѡ������
+    //     //dfs(nums,res,index+1,temp);
+    //     //ѡ������
+    //     temp.add(nums[index]);
+    //     dfs(nums,res,index+1,temp);
+    //     //4.reverse state
+    //     te
+    //}
+    /**
+     * 5.ȫ����2
+     * ����һ���ɰ����ظ����ֵ����У��������в��ظ���ȫ���С�
+     * ��֧��˼·��Ҫ�ڿ�����ʱû����
+     */
+    public List<List<Integer>> permuteUnique(int[] nums) {
+        int len = nums.length;
+        List<List<Integer>> res = new ArrayList<>();
+        if(len == 0){
+            return res;
+        }
+
+        Arrays.sort(nums);
+
+        boolean[] used = new boolean[len];
+        Deque<Integer> path = new ArrayDeque<>(len);
+        dfs(nums,res,len,0,path,used);
+        return res;
+    }
+    public void dfs(int[] nums,List<List<Integer>> res,int len,int depth,Deque<Integer> path,boolean[] used){
+        if(depth == len){
+            res.add(new ArrayList<>(path));
+            return ;
+        }
+        for(int i=0;i<len;i++){
+            if(used[i]){
+                continue;
+            }
+            //��֧����
+            if(i>0 && nums[i] == nums[i-1] && used[i-1] == false){
+                continue;
+            }
+            path.addLast(nums[i]);
+            used[i] = true;
+            dfs(nums,res,len,depth+1,path,used);
+
+            used[i] = false;
+            path.removeLast();
+
+        }
+    }
+}

From 5e7a5d5b7bb9d1bbb6f21822a4996a017f2f412c Mon Sep 17 00:00:00 2001
From: "yanquan.cyq" <devel89@sina.cn>
Date: Sun, 6 Sep 2020 21:25:01 +0800
Subject: [PATCH 6/6] week05

---
 .idea/libraries/KotlinJavaRuntime__3_.xml |  19 ++
 Week_01/.idea/workspace.xml               |   9 +-
 Week_05/README.md                         |  54 +++++-
 Week_05/Week_05.iml                       |  12 ++
 Week_05/src/homeWork.java                 | 201 ++++++++++++++++++++++
 5 files changed, 289 insertions(+), 6 deletions(-)
 create mode 100644 .idea/libraries/KotlinJavaRuntime__3_.xml
 create mode 100644 Week_05/Week_05.iml
 create mode 100644 Week_05/src/homeWork.java

diff --git a/.idea/libraries/KotlinJavaRuntime__3_.xml b/.idea/libraries/KotlinJavaRuntime__3_.xml
new file mode 100644
index 0000000..c688076
--- /dev/null
+++ b/.idea/libraries/KotlinJavaRuntime__3_.xml
@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="KotlinJavaRuntime (3)">
+    <CLASSES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES>
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-reflect-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-test-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk7-sources.jar!/" />
+      <root url="jar://$KOTLIN_BUNDLED$/lib/kotlin-stdlib-jdk8-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>
\ No newline at end of file
diff --git a/Week_01/.idea/workspace.xml b/Week_01/.idea/workspace.xml
index adae5a0..99d739c 100644
--- a/Week_01/.idea/workspace.xml
+++ b/Week_01/.idea/workspace.xml
@@ -32,8 +32,8 @@
       <file leaf-file-name="HomeWorkCyq.java" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/week01/src/HomeWorkCyq.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="384">
-              <caret line="183" column="25" selection-start-line="183" selection-start-column="25" selection-end-line="183" selection-end-column="25" />
+            <state relative-caret-position="2003">
+              <caret line="182" column="9" selection-start-line="182" selection-start-column="9" selection-end-line="182" selection-end-column="9" />
               <folding>
                 <element signature="e#4010#4019#0" expanded="true" />
                 <element signature="e#4811#4812#0" expanded="true" />
@@ -211,7 +211,6 @@
   </component>
   <component name="ToolWindowManager">
     <frame x="145" y="23" width="1424" height="827" extended-state="0" />
-    <editor active="true" />
     <layout>
       <window_info anchor="right" id="Palette" />
       <window_info anchor="bottom" id="TODO" order="6" />
@@ -273,8 +272,8 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/week01/src/HomeWorkCyq.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="384">
-          <caret line="183" column="25" selection-start-line="183" selection-start-column="25" selection-end-line="183" selection-end-column="25" />
+        <state relative-caret-position="2003">
+          <caret line="182" column="9" selection-start-line="182" selection-start-column="9" selection-end-line="182" selection-end-column="9" />
           <folding>
             <element signature="e#4010#4019#0" expanded="true" />
             <element signature="e#4811#4812#0" expanded="true" />
diff --git a/Week_05/README.md b/Week_05/README.md
index 50de304..e6d442b 100644
--- a/Week_05/README.md
+++ b/Week_05/README.md
@@ -1 +1,53 @@
-学习笔记
\ No newline at end of file
+学习笔记
+1.BFS
+pubulic class TreeNode{
+    int val;
+    TreeNode left;
+    TreeNode right;
+
+    TreeNode(int x){
+        val =x;
+    }
+}
+public List<List<Integer>> levelOrder(TreeNode root){
+    List<List<Integer>> allresults = new ArrayList<>();
+    if(root == null){
+        return allResults;
+     }
+     Queue<TreeNode> nodes = new LinkedList<>();
+     nodes.add(root);
+     while(!nodes.isEmpty()){
+        int size = nodes.size();
+        List<Integer> results = new ArrayList<>();
+        for(int i =0;i<size;i++){
+            TreeNode node = nodes.poll();
+            results.add(node.val);
+            if(node.left != null){
+                   nodes.add(node.left);
+             }
+             if(node.right != null){
+                nodes.add(node.right);
+             }
+          }
+          allResults.add(result);
+        }
+        return allResults;
+ }
+
+二分查找模版
+//假设数组是有序递增
+public int binarySearch(int[] array,int target){
+    int left=0,right=array.length-1;
+    while(left<=right){
+        int mid = (right-left)/2+left;//注意这种方法处理了(y-x)/2越界问题
+        if(array[mid] == target){
+            return mid;
+        }else if(array[mid]>target){
+            right = mid-1;
+        }else{
+            left = mid+1;
+        }
+    }
+    return right;
+}
+
diff --git a/Week_05/Week_05.iml b/Week_05/Week_05.iml
new file mode 100644
index 0000000..b2682d2
--- /dev/null
+++ b/Week_05/Week_05.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime (3)" level="project" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/Week_05/src/homeWork.java b/Week_05/src/homeWork.java
new file mode 100644
index 0000000..f024b3f
--- /dev/null
+++ b/Week_05/src/homeWork.java
@@ -0,0 +1,201 @@
+import java.util.Arrays;
+
+public class homeWork {
+    /**
+     * ƽ����
+     * @param x
+     * @return
+     */
+    public int mySqrt(int x) {
+        //���ֲ��ң�y=x^2,���������������½�(0-x)
+        if(x==0||x==1){
+            return x;
+        }
+        long left=1,right=x,mid=1;
+        while(left<=right){
+            mid = left+(right-left)/2;
+            if(mid*mid == x){
+                return (int)mid;
+            }else if(mid*mid>x){
+                right=mid-1;
+            }else{
+                left=mid+1;
+            }
+        }
+        return (int)right;
+    }
+    /**
+     * ţ�ٵ�����
+     * ����б�ʹ�ʽ�Ƶ�res=(cur+a/cur)/2
+     */
+    public int mySqrt(int x){
+        long cur=x;
+        while(cur*cur>x){
+            cur=(x+x/cur)/2;
+        }
+        return (int)cur;
+    }
+    /**
+     * 1. ����ˮ����
+     * https://leetcode-cn.com/problems/lemonade-change/description/
+     */
+    public boolean lemonadeChange(int[] bills) {
+        //ջ��ֵ��5��ֱ�ӷ��룬��5��5��2����pop֮ǰ��5���ڷ��룬4����pop5��3���ڷ���
+        //�������ֻ��5��10��20�����10000��(bills.length<10000)
+        int five =0,ten=0;
+        //1�������������
+        // if(bills.length == 0){
+        //     return true;
+        // }
+        // if(bills.length == 1 && bills[0] ==5){
+        //     return true;
+        // }else if(bills.length == 1 && (bills[0] == 10 || bills[0] == 20)){
+        //     return false;
+        // }
+        // //2.̰���㷨�ж�ѭ�������ݣ�20������10��5�������ȫ��5��
+        // for(int i=1;i<bills.length;i++){
+        //     if(bills[i] == 5){
+        //         five++;
+        //     }
+        //     if(bills[i] == 10){
+        //         if(five>0){
+        //             five--;
+        //             ten++;
+        //         }else{
+        //             return false;
+        //         }
+        //     }
+        //     if(bills[i] == 20){
+        //         if(five>0 && ten>0){
+        //             five--;
+        //             ten--;
+        //         }else if(five>2){
+        //             five -= 3;
+        //         }else{
+        //             return false;
+        //         }
+        //     }
+        // }
+        // return true;
+
+        //�ύʧ�ܺ�д���˵�
+        //1.���⴦��
+        if(bills.length < 1){
+            return true;
+        }
+        if(bills[0] != 5){
+            return false;
+        }
+        for(int i=0;i<bills.length;i++){
+            if(bills[i] ==5){
+                five++;
+            }else if(bills[i] == 10){
+                if(five<1){
+                    return false;
+                }
+                five--;
+                ten++;
+            }else{
+                if(five>0 && ten >0){
+                    five--;
+                    ten--;
+                }else if(five>2){
+                    five-=3;
+                }else{
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    /**
+     * ������Ʊ�����ʱ����
+     * ˼·��̰���㷨����ȡ�ֲ����Ž⣬Ȼ��ֻ�Ծֲ������������
+     */
+    public int maxProfit(int[] prices) {
+        //̰���㷨���ֲ����ţ��ֲ�Ϊ������룬���򲻼�
+        int res=0;
+        for(int i=0;i<prices.length-1;i++){
+            if(prices[i+1]-prices[i]<=0){
+                continue;
+            }
+            res+=prices[i+1]-prices[i];
+        }
+        return res;
+    }
+    /**
+     * �ַ�����
+     * ˼·��̰���㷨����������θ��С�ĺ���
+     */
+    public int findContentChildren(int[] children, int[] cookies) {
+        //1.���������ƥ������1������2���Ƿ��ж�Ӧ��
+        //2.̰���㷨���ֲ�����������С�ĺ���
+        //�����������������Ҫ��������ѭ������
+        // if(cookies.length ==0 || children.length == 0){
+        //     return 0;
+        // }
+        //����
+        Arrays.sort(cookies);
+        Arrays.sort(children);
+        //��������������������
+        int greedchild=0;
+        //int child=0,cooke=0;
+        //ѭ������������С�ĺ���
+        // for(child=0,cooke=0;child<=children.length && cooke<=cookies.length;child++,cooke++){
+        for(int cooke=0;greedchild<children.length && cooke<cookies.length;cooke++){
+            if(children[greedchild]<= cookies[cooke]){
+                greedchild++;
+            }
+        }
+        // while(cooke<cookies.length && greedchild<children.length){
+        //     if(cookies[cooke]>=children[greedchild]){
+        //         greedchild++;
+        //     }
+        //     cooke++;
+        // }
+        return greedchild;
+    }
+    /**
+     *ģ�����߻�����
+     * ˼·��
+     * ��������ⶼû����
+     */
+    public int robotSim(int[] commands, int[][] obstacles) {
+
+    }
+
+    /**
+     * ʹ�ö��ֲ��ң�Ѱ��һ������������ [4, 5, 6, 7, 0, 1, 2] �м�����ĵط�
+     * ˼·�����ֲ��ң��Ƚ��м�ֵ����������Ԫ�ش�С���������ģ���Ƚ��м�Ԫ�غ���βԪ�ش�С���ж������λ�����������һ��
+     */
+    public int findInorder(int[] nums){
+        //���⴦��
+        if(nums.length <= 2){
+            return -1;
+        }
+        int left=0,right=nums.length-1,mid;
+        while(left<right){
+            mid = left+(right-left)/2;
+            //���м�ֵ�����Ҳ���С����࣬���������λ��
+            if(nums[mid]>nums[mid+1] && nums[mid]<nums[mid-1]){
+                return mid;
+            }else if(nums[mid] > nums[mid-1]){
+                //�ж����Ҳ�
+                if(nums[mid]>nums[left]){
+                    left = mid+1;
+                }else {
+                    right=mid-1;
+                }
+            }else if(nums[mid] < nums[mid+1]){
+                //������
+                if(nums[mid]<nums[right]){
+                    right =mid-1;
+                }else{
+                    left = mid+1;
+                }
+
+            }
+        }
+        return -1;
+    }
+}