diff --git a/dal_rpc b/dal_rpc
new file mode 160000
index 0000000..187e30e
--- /dev/null
+++ b/dal_rpc
@@ -0,0 +1 @@
+Subproject commit 187e30e1ca12401d15e61e35d51b126e1e90a77d
diff --git a/gui/demos/Simple.kv b/gui/demos/Simple.kv
new file mode 100644
index 0000000..e2b74ab
--- /dev/null
+++ b/gui/demos/Simple.kv
@@ -0,0 +1,5 @@
+# File name: kivy_language.py
+# :kivy 1.11.1
+
+<Label>
+    text: 'hello' ' world!!!'
diff --git a/gui/demos/Simple2.kv b/gui/demos/Simple2.kv
new file mode 100644
index 0000000..7ed8e83
--- /dev/null
+++ b/gui/demos/Simple2.kv
@@ -0,0 +1,19 @@
+# File name: kivy_language2.py
+# :kivy 1.11.1
+
+
+<Widgets>:
+    Button:
+        size: 100,75
+        pos: 0,0
+        text: 'confirm'
+        color: 0,1,0,1
+        font_size:24
+
+
+    Button:
+        size: 100,75
+        pos: 100,0
+        text: 'confirm2'
+        color: 1,1,1,1
+        font_size:24
diff --git a/gui/demos/Simple3.kv b/gui/demos/Simple3.kv
new file mode 100644
index 0000000..c57c6fb
--- /dev/null
+++ b/gui/demos/Simple3.kv
@@ -0,0 +1,18 @@
+# File name: resizeable_placement.py
+# :kivy 1.11.1
+
+<Button>
+    font_size:24
+
+<Widgets>:
+    Button:
+        size: 100,75
+        pos: root.x, root.top - self.height
+        text: 'confirm'
+        color: 0,1,0,1
+
+    Button:
+        size: root.right//2,root.height//2
+        pos: root.right - self.width,0
+        text: 'confirm2'
+        color: 1,1,1,1
diff --git a/gui/demos/Simple4.kv b/gui/demos/Simple4.kv
new file mode 100644
index 0000000..967005f
--- /dev/null
+++ b/gui/demos/Simple4.kv
@@ -0,0 +1,16 @@
+# File name: float_layout.py
+# :kivy 1.11.1
+
+<Button>
+    font_size:24
+    color:0,1,0,1
+    size_hint:0.3,0.2
+
+<FloatLayout>:
+    Button:
+        text: "kivy"
+        pos_hint:{"x":0.5, "top":1}
+
+    Button:
+        text: "tutorials"
+        pos_hint:{"right":1, "y":0}
diff --git a/gui/demos/draw_app.py b/gui/demos/draw_app.py
new file mode 100644
index 0000000..7ad83d1
--- /dev/null
+++ b/gui/demos/draw_app.py
@@ -0,0 +1,28 @@
+from kivy.app import App
+from kivy.uix.widget import Widget
+from kivy.graphics import Line
+
+class DrawInput(Widget):
+    def on_touch_down(self, touch):
+        # touch mouse motion event
+        print(touch)
+        with self.canvas:
+            touch.ud["line"]=Line(points=(touch.x, touch.y))
+
+    def on_touch_move(self, touch):
+        # touch mouse motion event
+        print(touch)
+        touch.ud['line'].points += (touch.x, touch.y)
+    
+    def on_touch_up(self, touch):
+        # touch mouse motion event
+        print(touch)
+    
+    
+class Simple4(App):
+    def build(self):
+        return DrawInput()
+
+
+if __name__ == "__main__":
+    Simple4().run()
diff --git a/gui/demos/float_layout.py b/gui/demos/float_layout.py
new file mode 100644
index 0000000..31b1e28
--- /dev/null
+++ b/gui/demos/float_layout.py
@@ -0,0 +1,11 @@
+from kivy.app import App
+from kivy.uix.floatlayout import FloatLayout
+
+    
+class Simple4(App):
+    def build(self):
+        return FloatLayout()
+
+
+if __name__ == "__main__":
+    Simple4().run()
diff --git a/gui/demos/hello.py b/gui/demos/hello.py
new file mode 100644
index 0000000..ab8fbff
--- /dev/null
+++ b/gui/demos/hello.py
@@ -0,0 +1,11 @@
+from kivy.app import App
+from kivy.uix.label import Label
+
+
+class Simple(App):
+    def build(self):
+        return Label(text="hello world")
+
+
+if __name__ == "__main__":
+    Simple().run()
diff --git a/gui/demos/kivy_language.py b/gui/demos/kivy_language.py
new file mode 100644
index 0000000..3a148c3
--- /dev/null
+++ b/gui/demos/kivy_language.py
@@ -0,0 +1,11 @@
+from kivy.app import App
+from kivy.uix.label import Label
+
+
+class Simple(App):
+    def build(self):
+        return Label()
+
+
+if __name__ == "__main__":
+    Simple().run()
diff --git a/gui/demos/kivy_language2.py b/gui/demos/kivy_language2.py
new file mode 100644
index 0000000..e81f565
--- /dev/null
+++ b/gui/demos/kivy_language2.py
@@ -0,0 +1,16 @@
+from kivy.app import App
+from kivy.uix.label import Label
+from kivy.uix.widget import Widget
+
+
+class Widgets(Widget):
+    pass
+
+
+class Simple2(App):
+    def build(self):
+        return Widgets()
+
+
+if __name__ == "__main__":
+    Simple2().run()
diff --git a/gui/demos/main.py b/gui/demos/main.py
new file mode 100644
index 0000000..81f4244
--- /dev/null
+++ b/gui/demos/main.py
@@ -0,0 +1,14 @@
+from kivy.app import App
+from kivy.uix.widget import Widget
+from kivy.graphics import Line
+from kivy.lang import Builder
+
+presentation = Builder.lo
+    
+class MainApp(App):
+    def build(self):
+        return DrawInput()
+
+
+if __name__ == "__main__":
+    MainApp().run()
diff --git a/gui/demos/mouse_event.py b/gui/demos/mouse_event.py
new file mode 100644
index 0000000..3355b0f
--- /dev/null
+++ b/gui/demos/mouse_event.py
@@ -0,0 +1,25 @@
+from kivy.app import App
+from kivy.uix.widget import Widget
+
+
+class TouchInput(Widget):
+    def on_touch_down(self, touch):
+        # touch mouse motion event
+        print(touch)
+
+    def on_touch_move(self, touch):
+        # touch mouse motion event
+        print(touch)
+    
+    def on_touch_up(self, touch):
+        # touch mouse motion event
+        print(touch)
+    
+    
+class Simple4(App):
+    def build(self):
+        return TouchInput()
+
+
+if __name__ == "__main__":
+    Simple4().run()
diff --git a/gui/demos/resizeable_placement.py b/gui/demos/resizeable_placement.py
new file mode 100644
index 0000000..e3d7d03
--- /dev/null
+++ b/gui/demos/resizeable_placement.py
@@ -0,0 +1,16 @@
+from kivy.app import App
+from kivy.uix.label import Label
+from kivy.uix.widget import Widget
+
+
+class Widgets(Widget):
+    pass
+
+
+class Simple3(App):
+    def build(self):
+        return Widgets()
+
+
+if __name__ == "__main__":
+    Simple3().run()
diff --git a/gui/demos/wigets_label.py b/gui/demos/wigets_label.py
new file mode 100644
index 0000000..3af8996
--- /dev/null
+++ b/gui/demos/wigets_label.py
@@ -0,0 +1,33 @@
+from kivy.app import App
+from kivy.uix.label import Label
+from kivy.uix.gridlayout import GridLayout
+from kivy.uix.textinput import TextInput
+import logging
+logger = logging.getLogger(__name__)
+
+class LoginScreen(GridLayout):
+    def __init__(self, **kwargs):
+        super(LoginScreen, self).__init__(**kwargs)
+        # two cols for label and input
+        self.cols = 2
+        # username label
+        self.add_widget(Label(text="Username:"))
+        # username input 
+        self.username = TextInput(multiline=False)
+        self.add_widget(self.username)
+
+        self.add_widget(Label(text="Password:"))
+        self.password = TextInput(multiline=False, password=True)
+        self.add_widget(self.password)
+
+        self.add_widget(Label(text="two factor auth:"))
+        self.tfa = TextInput(multiline=False)
+        self.add_widget(self.tfa)
+
+class Simple(App):
+    def build(self):
+        return LoginScreen()
+
+
+if __name__ == "__main__":
+    Simple().run()
diff --git a/leetcode/.idea/codeStyles/codeStyleConfig.xml b/leetcode/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 0000000..a55e7a1
--- /dev/null
+++ b/leetcode/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+  </state>
+</component>
\ No newline at end of file
diff --git a/leetcode/.idea/thriftCompiler.xml b/leetcode/.idea/thriftCompiler.xml
new file mode 100644
index 0000000..7bc123c
--- /dev/null
+++ b/leetcode/.idea/thriftCompiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ThriftCompiler">
+    <compilers />
+  </component>
+</project>
\ No newline at end of file
diff --git a/leetcode/.idea/workspace.xml b/leetcode/.idea/workspace.xml
index 79a449c..6e876f9 100644
--- a/leetcode/.idea/workspace.xml
+++ b/leetcode/.idea/workspace.xml
@@ -2,13 +2,17 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="9d591de0-31e0-47fa-a179-92a384c10107" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/getPic.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/isPalindrome.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/longestCommonPrefix.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/mostWater.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/other.py" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/re_.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/.idea/codeStyles/codeStyleConfig.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/addTwoNum.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/common.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/findRadius.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/insersect.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/intersection.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/lastRemaining.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/lowestCommonAncestor.py" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/threeSum.py" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/longestCommonPrefix.py" beforeDir="false" afterPath="$PROJECT_DIR$/longestCommonPrefix.py" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -17,41 +21,53 @@
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
   <component name="CoverageDataManager">
-    <SUITE FILE_PATH="coverage/leetcode$longestCommonPrefix.coverage" NAME="longestCommonPrefix Coverage Results" MODIFIED="1550761403501" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$longestCommonPrefix.coverage" NAME="longestCommonPrefix Coverage Results" MODIFIED="1550902062765" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
     <SUITE FILE_PATH="coverage/leetcode$intToRoman.coverage" NAME="intToRoman Coverage Results" MODIFIED="1550758342552" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$lastRemaining.coverage" NAME="lastRemaining Coverage Results" MODIFIED="1556186821694" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
     <SUITE FILE_PATH="coverage/leetcode$atoi.coverage" NAME="atoi Coverage Results" MODIFIED="1550711372079" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$intersection.coverage" NAME="intersection Coverage Results" MODIFIED="1556031341066" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$insersect.coverage" NAME="insersect Coverage Results" MODIFIED="1556032849303" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
     <SUITE FILE_PATH="coverage/leetcode$isPalindrome.coverage" NAME="isPalindrome Coverage Results" MODIFIED="1550725503048" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
-    <SUITE FILE_PATH="coverage/leetcode$getPic.coverage" NAME="getPic Coverage Results" MODIFIED="1550803307513" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$getPic.coverage" NAME="getPic Coverage Results" MODIFIED="1550895837826" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$commonChars.coverage" NAME="commonChars Coverage Results" MODIFIED="1556176326768" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$addTwoNum.coverage" NAME="addTwoNum Coverage Results" MODIFIED="1556177191894" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
+    <SUITE FILE_PATH="coverage/leetcode$threeSum.coverage" NAME="threeSum Coverage Results" MODIFIED="1551230788599" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
     <SUITE FILE_PATH="coverage/leetcode$mostWater.coverage" NAME="mostWater Coverage Results" MODIFIED="1550755106172" SOURCE_PROVIDER="com.intellij.coverage.DefaultCoverageFileProvider" RUNNER="coverage.py" COVERAGE_BY_TEST_ENABLED="true" COVERAGE_TRACING_ENABLED="false" WORKING_DIRECTORY="$PROJECT_DIR$" />
   </component>
   <component name="FileEditorManager">
-    <leaf>
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/atoi.py">
+        <entry file="file://$PROJECT_DIR$/lastRemaining.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="342">
-              <caret line="18" column="18" selection-start-line="18" selection-start-column="18" selection-end-line="18" selection-end-column="18" />
+            <state relative-caret-position="209">
+              <caret line="11" column="46" selection-start-line="11" selection-start-column="46" selection-end-line="11" selection-end-column="46" />
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/longestCommonPrefix.py">
+        <entry file="file://$PROJECT_DIR$/lowestCommonAncestor.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="68">
-              <caret line="15" selection-start-line="15" selection-end-line="15" />
+            <state relative-caret-position="551">
+              <caret line="29" selection-start-line="10" selection-start-column="8" selection-end-line="29" />
             </state>
           </provider>
         </entry>
       </file>
       <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/getPic.py">
+        <entry file="file://$PROJECT_DIR$/findRadius.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="109">
-              <caret line="24" column="38" selection-start-line="24" selection-start-column="38" selection-end-line="24" selection-end-column="38" />
-              <folding>
-                <element signature="e#456#471#0" expanded="true" />
-              </folding>
+            <state relative-caret-position="171">
+              <caret line="9" column="30" selection-start-line="9" selection-start-column="30" selection-end-line="9" selection-end-column="30" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/addTwoNum.py">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="399">
+              <caret line="21" column="9" selection-start-line="21" selection-start-column="9" selection-end-line="21" selection-end-column="9" />
             </state>
           </provider>
         </entry>
@@ -85,15 +101,25 @@
         <option value="$PROJECT_DIR$/mostWater.py" />
         <option value="$PROJECT_DIR$/intToRoman.py" />
         <option value="$PROJECT_DIR$/isPalindrome.py" />
-        <option value="$PROJECT_DIR$/longestCommonPrefix.py" />
         <option value="$PROJECT_DIR$/getPic.py" />
+        <option value="$PROJECT_DIR$/longestCommonPrefix.py" />
+        <option value="$PROJECT_DIR$/common.py" />
+        <option value="$PROJECT_DIR$/threeSum.py" />
+        <option value="$PROJECT_DIR$/intersection.py" />
+        <option value="$PROJECT_DIR$/insersect.py" />
+        <option value="$PROJECT_DIR$/commonChars.py" />
+        <option value="$PROJECT_DIR$/addTwoNum.py" />
+        <option value="$PROJECT_DIR$/lastRemaining.py" />
+        <option value="$PROJECT_DIR$/lowestCommonAncestor.py" />
+        <option value="$PROJECT_DIR$/findRadius.py" />
       </list>
     </option>
   </component>
-  <component name="ProjectFrameBounds" extendedState="6" fullScreen="true">
+  <component name="ProjectFrameBounds">
+    <option name="x" value="41" />
     <option name="y" value="23" />
-    <option name="width" value="1280" />
-    <option name="height" value="777" />
+    <option name="width" value="1440" />
+    <option name="height" value="877" />
   </component>
   <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
   <component name="ProjectView">
@@ -101,6 +127,7 @@
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
+      <pane id="Scope" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -108,16 +135,10 @@
               <item name="leetcode" type="b2602c69:ProjectViewProjectNode" />
               <item name="leetcode" type="462c0819:PsiDirectoryNode" />
             </path>
-            <path>
-              <item name="leetcode" type="b2602c69:ProjectViewProjectNode" />
-              <item name="leetcode" type="462c0819:PsiDirectoryNode" />
-              <item name="imgs" type="462c0819:PsiDirectoryNode" />
-            </path>
           </expand>
           <select />
         </subPane>
       </pane>
-      <pane id="Scope" />
     </panes>
   </component>
   <component name="PropertiesComponent">
@@ -125,7 +146,7 @@
     <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <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="settings.editor.selected.configurable" value="com.jetbrains.python.configuration.PyActiveSdkModuleConfigurable" />
+    <property name="settings.editor.selected.configurable" value="preferences.sourceCode.Python" />
   </component>
   <component name="RunDashboard">
     <option name="ruleStates">
@@ -139,8 +160,8 @@
       </list>
     </option>
   </component>
-  <component name="RunManager" selected="Python.getPic">
-    <configuration name="getPic" type="PythonConfigurationType" factoryName="Python" temporary="true">
+  <component name="RunManager" selected="Python.lastRemaining">
+    <configuration name="addTwoNum" type="PythonConfigurationType" factoryName="Python" temporary="true">
       <module name="leetcode" />
       <option name="INTERPRETER_OPTIONS" value="" />
       <option name="PARENT_ENVS" value="true" />
@@ -153,7 +174,7 @@
       <option name="ADD_CONTENT_ROOTS" value="true" />
       <option name="ADD_SOURCE_ROOTS" value="true" />
       <EXTENSION ID="PythonCoverageRunConfigurationExtension" runner="coverage.py" />
-      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/getPic.py" />
+      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/addTwoNum.py" />
       <option name="PARAMETERS" value="" />
       <option name="SHOW_COMMAND_LINE" value="false" />
       <option name="EMULATE_TERMINAL" value="false" />
@@ -162,7 +183,7 @@
       <option name="INPUT_FILE" value="" />
       <method v="2" />
     </configuration>
-    <configuration name="intToRoman" type="PythonConfigurationType" factoryName="Python" temporary="true">
+    <configuration name="commonChars" type="PythonConfigurationType" factoryName="Python" temporary="true">
       <module name="leetcode" />
       <option name="INTERPRETER_OPTIONS" value="" />
       <option name="PARENT_ENVS" value="true" />
@@ -175,7 +196,7 @@
       <option name="ADD_CONTENT_ROOTS" value="true" />
       <option name="ADD_SOURCE_ROOTS" value="true" />
       <EXTENSION ID="PythonCoverageRunConfigurationExtension" runner="coverage.py" />
-      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/intToRoman.py" />
+      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/commonChars.py" />
       <option name="PARAMETERS" value="" />
       <option name="SHOW_COMMAND_LINE" value="false" />
       <option name="EMULATE_TERMINAL" value="false" />
@@ -184,7 +205,7 @@
       <option name="INPUT_FILE" value="" />
       <method v="2" />
     </configuration>
-    <configuration name="isPalindrome" type="PythonConfigurationType" factoryName="Python" temporary="true">
+    <configuration name="insersect" type="PythonConfigurationType" factoryName="Python" temporary="true">
       <module name="leetcode" />
       <option name="INTERPRETER_OPTIONS" value="" />
       <option name="PARENT_ENVS" value="true" />
@@ -197,7 +218,7 @@
       <option name="ADD_CONTENT_ROOTS" value="true" />
       <option name="ADD_SOURCE_ROOTS" value="true" />
       <EXTENSION ID="PythonCoverageRunConfigurationExtension" runner="coverage.py" />
-      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/isPalindrome.py" />
+      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/insersect.py" />
       <option name="PARAMETERS" value="" />
       <option name="SHOW_COMMAND_LINE" value="false" />
       <option name="EMULATE_TERMINAL" value="false" />
@@ -206,7 +227,7 @@
       <option name="INPUT_FILE" value="" />
       <method v="2" />
     </configuration>
-    <configuration name="longestCommonPrefix" type="PythonConfigurationType" factoryName="Python" temporary="true">
+    <configuration name="intersection" type="PythonConfigurationType" factoryName="Python" temporary="true">
       <module name="leetcode" />
       <option name="INTERPRETER_OPTIONS" value="" />
       <option name="PARENT_ENVS" value="true" />
@@ -219,7 +240,7 @@
       <option name="ADD_CONTENT_ROOTS" value="true" />
       <option name="ADD_SOURCE_ROOTS" value="true" />
       <EXTENSION ID="PythonCoverageRunConfigurationExtension" runner="coverage.py" />
-      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/longestCommonPrefix.py" />
+      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/intersection.py" />
       <option name="PARAMETERS" value="" />
       <option name="SHOW_COMMAND_LINE" value="false" />
       <option name="EMULATE_TERMINAL" value="false" />
@@ -228,7 +249,7 @@
       <option name="INPUT_FILE" value="" />
       <method v="2" />
     </configuration>
-    <configuration name="mostWater" type="PythonConfigurationType" factoryName="Python" temporary="true">
+    <configuration name="lastRemaining" type="PythonConfigurationType" factoryName="Python" temporary="true">
       <module name="leetcode" />
       <option name="INTERPRETER_OPTIONS" value="" />
       <option name="PARENT_ENVS" value="true" />
@@ -241,7 +262,7 @@
       <option name="ADD_CONTENT_ROOTS" value="true" />
       <option name="ADD_SOURCE_ROOTS" value="true" />
       <EXTENSION ID="PythonCoverageRunConfigurationExtension" runner="coverage.py" />
-      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/mostWater.py" />
+      <option name="SCRIPT_NAME" value="$PROJECT_DIR$/lastRemaining.py" />
       <option name="PARAMETERS" value="" />
       <option name="SHOW_COMMAND_LINE" value="false" />
       <option name="EMULATE_TERMINAL" value="false" />
@@ -252,11 +273,11 @@
     </configuration>
     <recent_temporary>
       <list>
-        <item itemvalue="Python.getPic" />
-        <item itemvalue="Python.longestCommonPrefix" />
-        <item itemvalue="Python.intToRoman" />
-        <item itemvalue="Python.mostWater" />
-        <item itemvalue="Python.isPalindrome" />
+        <item itemvalue="Python.lastRemaining" />
+        <item itemvalue="Python.addTwoNum" />
+        <item itemvalue="Python.commonChars" />
+        <item itemvalue="Python.insersect" />
+        <item itemvalue="Python.intersection" />
       </list>
     </recent_temporary>
   </component>
@@ -270,37 +291,69 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1550711175030</updated>
-      <workItem from="1550711176394" duration="16220000" />
+      <workItem from="1550711176394" duration="30910000" />
+      <workItem from="1550917385699" duration="2705000" />
+      <workItem from="1551151097857" duration="5726000" />
+      <workItem from="1551441635687" duration="190000" />
+      <workItem from="1551672721207" duration="804000" />
+      <workItem from="1552542731625" duration="884000" />
+      <workItem from="1553479811557" duration="569000" />
+      <workItem from="1553652791311" duration="427000" />
+      <workItem from="1553689613924" duration="287000" />
+      <workItem from="1554085372439" duration="414000" />
+      <workItem from="1554173109571" duration="420000" />
+      <workItem from="1556025818570" duration="2534000" />
+      <workItem from="1556029525252" duration="2557000" />
+      <workItem from="1556087861633" duration="10660000" />
+      <workItem from="1556374629886" duration="270000" />
+      <workItem from="1556418529831" duration="208000" />
+      <workItem from="1556806201885" duration="185000" />
+      <workItem from="1556862799057" duration="666000" />
+      <workItem from="1556863761217" duration="238000" />
+      <workItem from="1557277158561" duration="549000" />
+      <workItem from="1557540503919" duration="207000" />
+      <workItem from="1569405988023" duration="158000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="16220000" />
+    <option name="totallyTimeSpent" value="61568000" />
+  </component>
+  <component name="TodoView">
+    <todo-panel id="selected-file">
+      <is-autoscroll-to-source value="true" />
+    </todo-panel>
+    <todo-panel id="all">
+      <are-packages-shown value="true" />
+      <is-autoscroll-to-source value="true" />
+    </todo-panel>
   </component>
   <component name="ToolWindowManager">
-    <frame x="0" y="0" width="1440" height="900" extended-state="6" />
+    <frame x="41" y="23" width="1440" height="877" extended-state="0" />
+    <editor active="true" />
     <layout>
-      <window_info id="Favorites" side_tool="true" />
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24964234" />
+      <window_info content_ui="combo" id="Project" order="0" weight="0.30623817" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
-      <window_info anchor="bottom" id="Docker" show_stripe_button="false" />
-      <window_info anchor="bottom" id="Database Changes" />
-      <window_info anchor="bottom" id="Version Control" />
-      <window_info anchor="bottom" id="Python Console" weight="0.6951807" />
-      <window_info anchor="bottom" id="Terminal" weight="0.32891566" />
-      <window_info anchor="bottom" id="Event Log" side_tool="true" />
+      <window_info id="Favorites" order="2" side_tool="true" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Find" order="1" />
-      <window_info anchor="bottom" id="Run" order="2" visible="true" weight="0.28554216" />
+      <window_info anchor="bottom" id="Run" order="2" weight="0.28554216" />
       <window_info anchor="bottom" id="Debug" order="3" weight="0.3060241" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
-      <window_info anchor="bottom" id="TODO" order="6" />
-      <window_info anchor="right" id="SciView" />
-      <window_info anchor="right" id="Database" />
+      <window_info anchor="bottom" id="TODO" order="6" weight="0.32891566" />
+      <window_info anchor="bottom" id="Docker" order="7" show_stripe_button="false" />
+      <window_info anchor="bottom" id="Version Control" order="8" />
+      <window_info anchor="bottom" id="Database Changes" order="9" />
+      <window_info anchor="bottom" id="Event Log" order="10" side_tool="true" />
+      <window_info active="true" anchor="bottom" id="Terminal" order="11" visible="true" weight="0.328084" />
+      <window_info anchor="bottom" id="Python Console" order="12" weight="0.4081365" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+      <window_info anchor="right" id="SciView" order="3" />
+      <window_info anchor="right" id="Database" order="4" />
+      <window_info anchor="right" id="Coverage" order="5" side_tool="true" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -311,8 +364,8 @@
       <breakpoints>
         <line-breakpoint enabled="true" suspend="THREAD" type="python-line">
           <url>file://$PROJECT_DIR$/longestCommonPrefix.py</url>
-          <line>27</line>
-          <option name="timeStamp" value="6" />
+          <line>17</line>
+          <option name="timeStamp" value="7" />
         </line-breakpoint>
       </breakpoints>
     </breakpoint-manager>
@@ -367,17 +420,31 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/longestCommonPrefix.py">
+    <entry file="file://$USER_HOME$/.pyenv/versions/spider/lib/python3.6/site-packages/requests/api.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="124">
+          <caret line="62" column="4" selection-start-line="62" selection-start-column="4" selection-end-line="62" selection-end-column="4" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$USER_HOME$/Library/Caches/PyCharm2018.3/python_stubs/-1199943126/builtins.py">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="68">
-          <caret line="15" selection-start-line="15" selection-end-line="15" />
+          <caret line="3571" column="16" selection-start-line="3571" selection-start-column="6" selection-end-line="3571" selection-end-column="16" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$USER_HOME$/.pyenv/versions/spider/lib/python3.6/site-packages/requests/api.py">
+    <entry file="file://$PROJECT_DIR$/imgs/4.png" />
+    <entry file="file://$PROJECT_DIR$/imgs/5.png" />
+    <entry file="file://$PROJECT_DIR$/imgs/6.png" />
+    <entry file="file://$PROJECT_DIR$/imgs/8.png" />
+    <entry file="file://$PROJECT_DIR$/imgs/2.png" />
+    <entry file="file://$PROJECT_DIR$/imgs/3.png" />
+    <entry file="file://$PROJECT_DIR$/imgs/1.txt" />
+    <entry file="file://$USER_HOME$/.pyenv/versions/3.6.2/lib/python3.6/logging/__init__.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="124">
-          <caret line="62" column="4" selection-start-line="62" selection-start-column="4" selection-end-line="62" selection-end-column="4" />
+        <state relative-caret-position="32490">
+          <caret line="1712" column="4" selection-start-line="1712" selection-start-column="4" selection-end-line="1712" selection-end-column="4" />
         </state>
       </provider>
     </entry>
@@ -388,42 +455,111 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$USER_HOME$/Library/Caches/PyCharm2018.3/python_stubs/-1199943126/builtins.py">
+    <entry file="file://$PROJECT_DIR$/threeSum.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="68">
-          <caret line="3571" column="16" selection-start-line="3571" selection-start-column="6" selection-end-line="3571" selection-end-column="16" />
+        <state relative-caret-position="4522">
+          <caret line="238" column="8" selection-start-line="238" selection-start-column="8" selection-end-line="238" selection-end-column="8" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/4.png">
-      <provider selected="true" editor-type-id="images" />
+    <entry file="file://$PROJECT_DIR$/common.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="114">
+          <caret line="6" selection-start-line="6" selection-end-line="6" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/5.png">
-      <provider selected="true" editor-type-id="images" />
+    <entry file="file://$PROJECT_DIR$/longestCommonPrefix.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="304">
+          <caret line="16" column="66" selection-start-line="16" selection-start-column="36" selection-end-line="16" selection-end-column="66" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/6.png">
-      <provider selected="true" editor-type-id="images" />
+    <entry file="file://$USER_HOME$/Library/Caches/PyCharm2018.3/python_stubs/1906954280/builtins.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="82403">
+          <caret line="4337" column="8" selection-start-line="4337" selection-start-column="8" selection-end-line="4337" selection-end-column="8" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/8.png">
-      <provider selected="true" editor-type-id="images" />
+    <entry file="file://$PROJECT_DIR$/getPic.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="133">
+          <caret line="7" selection-start-line="7" selection-end-line="7" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/2.png">
-      <provider selected="true" editor-type-id="images" />
+    <entry file="file://$PROJECT_DIR$/insersect.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="206">
+          <caret line="24" column="13" lean-forward="true" selection-start-line="24" selection-start-column="13" selection-end-line="24" selection-end-column="13" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/3.png">
-      <provider selected="true" editor-type-id="images" />
+    <entry file="file://$PROJECT_DIR$/intersection.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="72">
+          <caret line="9" selection-start-line="9" selection-end-line="10" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/imgs/1.txt">
+    <entry file="file://$USER_HOME$/.pyenv/versions/spider/lib/python3.6/site-packages/pip/_vendor/progress/counter.py">
       <provider selected="true" editor-type-id="text-editor" />
-      <provider editor-type-id="images" />
     </entry>
-    <entry file="file://$PROJECT_DIR$/getPic.py">
+    <entry file="file://$USER_HOME$/Library/Caches/PyCharm2018.3/python_stubs/1906954280/itertools.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="4003">
+          <caret line="240" column="6" selection-start-line="240" selection-start-column="6" selection-end-line="240" selection-end-column="6" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/commonChars.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="171">
+          <caret line="9" column="20" lean-forward="true" selection-start-line="9" selection-start-column="20" selection-end-line="9" selection-end-column="20" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/lastRemaining.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="209">
+          <caret line="11" column="46" selection-start-line="11" selection-start-column="46" selection-end-line="11" selection-end-column="46" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/lowestCommonAncestor.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="551">
+          <caret line="29" selection-start-line="10" selection-start-column="8" selection-end-line="29" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/addTwoNum.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="399">
+          <caret line="21" column="9" selection-start-line="21" selection-start-column="9" selection-end-line="21" selection-end-column="9" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$USER_HOME$/.pyenv/versions/3.6.2/lib/python3.6/pprint.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="375">
+          <caret line="52" column="18" selection-start-line="52" selection-start-column="12" selection-end-line="52" selection-end-column="18" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$USER_HOME$/.pyenv/versions/spider/lib/python3.6/site-packages/prettyprinter/__init__.py">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="151">
+          <caret line="199" column="26" selection-start-line="199" selection-start-column="11" selection-end-line="199" selection-end-column="26" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/findRadius.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="109">
-          <caret line="24" column="38" selection-start-line="24" selection-start-column="38" selection-end-line="24" selection-end-column="38" />
-          <folding>
-            <element signature="e#456#471#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="171">
+          <caret line="9" column="30" selection-start-line="9" selection-start-column="30" selection-end-line="9" selection-end-column="30" />
         </state>
       </provider>
     </entry>
diff --git a/leetcode/addTwoNum.py b/leetcode/addTwoNum.py
new file mode 100644
index 0000000..b711f40
--- /dev/null
+++ b/leetcode/addTwoNum.py
@@ -0,0 +1,36 @@
+# coding=utf-8
+class ListNode:
+    def __init__(self, x):
+        self.val = x
+        self.next = None
+
+
+def addTwoNumbers(l1: ListNode, l2: ListNode):
+    res = None
+    start = None
+    addition = 0
+    while not (l1 is None and l2 is None):
+        num1 = l1.val if l1 else 0
+        num2 = l2.val if l1 else 0
+        s = num1 + num2 + addition
+        addition = s // 10
+        if res:
+            res.next = ListNode(s % 10)
+            res = res.next
+        else:
+            start = ListNode(s % 10)
+            res = start
+        l1 = l1.next if l1 else None
+        l2 = l2.next if l2 else None
+    if addition != 0:
+        res.next = ListNode(addition)
+    return start
+
+
+l1 = ListNode(2)
+l1.next = ListNode(4)
+l1.next.next = ListNode(3)
+l2 = ListNode(5)
+l2.next = ListNode(6)
+l2.next.next = ListNode(4)
+print(addTwoNumbers(l1, l2))
diff --git a/leetcode/common.py b/leetcode/common.py
new file mode 100644
index 0000000..3ec108b
--- /dev/null
+++ b/leetcode/common.py
@@ -0,0 +1,10 @@
+import time
+
+
+def timer(func):
+    def clock(*args, **kwargs):
+        s = time.time()
+        res = func(*args, **kwargs)
+        print(time.time() - s)
+        return res
+    return clock
diff --git a/leetcode/commonChars.py b/leetcode/commonChars.py
new file mode 100644
index 0000000..f7e3a41
--- /dev/null
+++ b/leetcode/commonChars.py
@@ -0,0 +1,19 @@
+def commonChars(A: []):
+    if not A:
+        return []
+    A = sorted(A, key=lambda a: len(a))
+    c = {}
+    for i in A[0]:
+        if i in c:
+            c[i] += 1
+        else:
+            c[i] = 1
+
+    for key in c:
+        count = c[key]
+        for chars in A[1:]:
+            pass
+
+
+
+print(commonChars(["bella", "label", "roller"]))
diff --git a/leetcode/findRadius.py b/leetcode/findRadius.py
new file mode 100644
index 0000000..31e8665
--- /dev/null
+++ b/leetcode/findRadius.py
@@ -0,0 +1,10 @@
+# coding=utf-8
+def findRadius(houses, heaters):
+    max_radius = (houses[-1] - houses[0]) // 2
+    r = None
+    for house in houses:
+        if r is None:
+            r =None
+
+
+from prettyprinter import cpprint
diff --git a/leetcode/insersect.py b/leetcode/insersect.py
new file mode 100644
index 0000000..c07b939
--- /dev/null
+++ b/leetcode/insersect.py
@@ -0,0 +1,32 @@
+# coding=utf-8
+def intersect(nums1, nums2):
+    if nums1 == [] or nums2 == []:
+        return []
+
+    d1 = {}
+    for num in nums1:
+        if num not in d1:
+            d1[num] = 1
+        else:
+            d1[num] += 1
+
+    d2 = {}
+    for num in nums2:
+        if num not in d2:
+            d2[num] = 1
+        else:
+            d2[num] += 1
+
+    ret = []
+
+    for num in d1:
+        if num not in d2:
+            continue
+        else:
+            ret.extend([num for i in range(min(d1[num], d2[num]))])
+
+    return ret
+
+
+print(intersect([4,9, 5], [9,4,9,8,4]))
+
diff --git a/leetcode/intersection.py b/leetcode/intersection.py
new file mode 100644
index 0000000..867bcc0
--- /dev/null
+++ b/leetcode/intersection.py
@@ -0,0 +1,21 @@
+# coding=utf-8
+def intersection(nums1, nums2):
+    qs = lambda nums: nums if len(nums) <= 1 else qs([i for i in nums[1:] if i < nums[0]]) + [nums[0]] + qs(
+        [i for i in nums[1:] if i > nums[0]])
+
+    nums1 = qs(nums1)
+    nums2 = qs(nums2)
+    print(nums1)
+    print(nums2)
+    d = {i: 1 for i in nums1}
+    ret = []
+    for num in nums1:
+        if num in d:
+            d[num] += 1
+            ret.append(d[num])
+        if num > nums1[-1]:
+            break
+    return ret
+
+
+print(intersection([1, 2, 2, 1], [2, 2]))
diff --git a/leetcode/lastRemaining.py b/leetcode/lastRemaining.py
new file mode 100644
index 0000000..b022bd9
--- /dev/null
+++ b/leetcode/lastRemaining.py
@@ -0,0 +1,28 @@
+# coding=utf-8
+'''
+给定一个从1 到 n 排序的整数列表。
+首先，从左到右，从第一个数字开始，每隔一个数字进行删除，直到列表的末尾。
+第二步，在剩下的数字中，从右到左，从倒数第一个数字开始，每隔一个数字进行删除，直到列表开头。
+我们不断重复这两步，从左到右和从右到左交替进行，直到只剩下一个数字。
+返回长度为 n 的列表中，最后剩下的数字。
+'''
+
+
+def lastRemaining(n):
+    return 1 if n == 1 else 2 * (n // 2 + 1 - lastRemaining(n // 2))
+    step = 0
+    while n // 2 >= 1:
+        n = n // 2
+        step += 1
+    return step
+    li = [i for i in range(1, n + 1)]
+
+    while li.__len__() > 1:
+        li = li[1::2][::-1]
+        # print(li)
+    return li[0]
+
+
+for i in range(1, 90):
+    print(lastRemaining(i))
+print(lastRemaining(7))
diff --git a/leetcode/longestCommonPrefix.py b/leetcode/longestCommonPrefix.py
index 204ea38..b74bc06 100644
--- a/leetcode/longestCommonPrefix.py
+++ b/leetcode/longestCommonPrefix.py
@@ -14,22 +14,23 @@ def longestCommonPrefix(strs):
 
     while i <= l:
         print(ret)
+        s = start[i:i + short // 2] if short > 1 else start[i:i+1]
         try:
-            if all([chars.startswith(start[i:i + short // 2]) for chars in strs]):
-                ret += start[i:i + short // 2]
+            if all([chars.startswith(ret+s) for chars in strs]):
+                ret += s
                 i = i + short // 2
-                short //= 2
-                continue
 
+            else:
+                short //= 2
         except IndexError:
             # zai qian 1/2
             pass
 
-        short //= 2
-        if short<=1:
+            short //= 2
+        if short <= 1:
             return ret
 
     return ret
 
 
-print(longestCommonPrefix(["rdog", "racecar", "rar"]))
+print(longestCommonPrefix(["a", "a"]))
diff --git a/leetcode/lowestCommonAncestor.py b/leetcode/lowestCommonAncestor.py
new file mode 100644
index 0000000..1326750
--- /dev/null
+++ b/leetcode/lowestCommonAncestor.py
@@ -0,0 +1,29 @@
+# coding=utf-8
+class TreeNode:
+    def __init__(self, x):
+        self.val = x
+        self.left = None
+        self.right = None
+
+
+class Solution:
+    def lowestCommonAncestor(self, root: 'TreeNode', p: 'TreeNode', q: 'TreeNode') -> 'TreeNode':
+        p, q = (p, q) if p.val < q.val else (q, p)
+        p_v = p.val
+        q_v = q.val
+        root_v = root.val
+        if p_v == root_v:
+            return p_v
+        elif q_v == root_v:
+            return q_v
+        if root_v in range(p_v+1, q_v):
+            return root
+
+        else:
+            root = root.left if root_v > p_v else root.right
+            if root.val == q_v:
+                return q
+            elif root.val == p_v:
+                return p
+            else:
+                return self.lowestCommonAncestor(root, p, q)
diff --git a/leetcode/threeSum.py b/leetcode/threeSum.py
new file mode 100644
index 0000000..69ac51e
--- /dev/null
+++ b/leetcode/threeSum.py
@@ -0,0 +1,239 @@
+from common import timer
+
+
+@timer
+def threeSum(nums):
+    nums.sort()
+    length = len(nums)
+    ret = []
+    t = set(nums)
+    if len(t) == 1:
+        return [[0, 0, 0]] if t.pop() == 0 else []
+
+    def twoSum(index):
+        li = nums[:index] if index > (length - 2) else nums[:index] + nums[index + 1:]
+        l = 0
+        r = length - 2
+        while l < r:
+            temp = li[l] + li[r] + nums[index]
+            if temp < 0:
+                l += 1
+            elif temp > 0:
+                r -= 1
+            elif temp == 0:
+                res = [li[l], nums[index], li[r]]
+                res.sort()
+                if res not in ret:
+                    ret.append(res)
+                r -= 1
+
+    for i in range(length):
+        twoSum(i)
+    return ret
+
+
+nums = [82597, -9243, 62390, 83030, -97960, -26521, -61011, 83390, -38677, 12333, 75987, 46091, 83794, 19355, -71037,
+        -6242, -28801, 324, 1202, -90885, -2989, -95597, -34333, 35528, 5680, 89093, -90606, 50360, -29393, -27012,
+        53313, 65213, 99818, -82405, -41661, -3333, -51952, 72135, -1523, 26377, 74685, 96992, 92263, 15929, 5467,
+        -99555, -43348, -41689, -60383, -3990, 32165, 65265, -72973, -58372, 12741, -48568, -46596, 72419, -1859, 34153,
+        62937, 81310, -61823, -96770, -54944, 8845, -91184, 24208, -29078, 31495, 65258, 14198, 85395, 70506, -40908,
+        56740, -12228, -40072, 32429, 93001, 68445, -73927, 25731, -91859, -24150, 10093, -60271, -81683, -18126, 51055,
+        48189, -6468, 25057, 81194, -58628, 74042, 66158, -14452, -49851, -43667, 11092, 39189, -17025, -79173, 13606,
+        83172, 92647, -59741, 19343, -26644, -57607, 82908, -20655, 1637, 80060, 98994, 39331, -31274, -61523, 91225,
+        -72953, 13211, -75116, -98421, -41571, -69074, 99587, 39345, 42151, -2460, 98236, 15690, -52507, -95803, -48935,
+        -46492, -45606, -79254, -99851, 52533, 73486, 39948, -7240, 71815, -585, -96252, 90990, -93815, 93340, -71848,
+        58733, -14859, -83082, -75794, -82082, -24871, -15206, 91207, -56469, -93618, 67131, -8682, 75719, 87429,
+        -98757, -7535, -24890, -94160, 85003, 33928, 75538, 97456, -66424, -60074, -8527, -28697, -22308, 2246, -70134,
+        -82319, -10184, 87081, -34949, -28645, -47352, -83966, -60418, -15293, -53067, -25921, 55172, 75064, 95859,
+        48049, 34311, -86931, -38586, 33686, -36714, 96922, 76713, -22165, -80585, -34503, -44516, 39217, -28457, 47227,
+        -94036, 43457, 24626, -87359, 26898, -70819, 30528, -32397, -69486, 84912, -1187, -98986, -32958, 4280, -79129,
+        -65604, 9344, 58964, 50584, 71128, -55480, 24986, 15086, -62360, -42977, -49482, -77256, -36895, -74818, 20,
+        3063, -49426, 28152, -97329, 6086, 86035, -88743, 35241, 44249, 19927, -10660, 89404, 24179, -26621, -6511,
+        57745, -28750, 96340, -97160, -97822, -49979, 52307, 79462, 94273, -24808, 77104, 9255, -83057, 77655, 21361,
+        55956, -9096, 48599, -40490, -55107, 2689, 29608, 20497, 66834, -34678, 23553, -81400, -66630, -96321, -34499,
+        -12957, -20564, 25610, -4322, -58462, 20801, 53700, 71527, 24669, -54534, 57879, -3221, 33636, 3900, 97832,
+        -27688, -98715, 5992, 24520, -55401, -57613, -69926, 57377, -77610, 20123, 52174, 860, 60429, -91994, -62403,
+        -6218, -90610, -37263, -15052, 62069, -96465, 44254, 89892, -3406, 19121, -41842, -87783, -64125, -56120, 73904,
+        -22797, -58118, -4866, 5356, 75318, 46119, 21276, -19246, -9241, -97425, 57333, -15802, 93149, 25689, -5532,
+        95716, 39209, -87672, -29470, -16324, -15331, 27632, -39454, 56530, -16000, 29853, 46475, 78242, -46602, 83192,
+        -73440, -15816, 50964, -36601, 89758, 38375, -40007, -36675, -94030, 67576, 46811, -64919, 45595, 76530, 40398,
+        35845, 41791, 67697, -30439, -82944, 63115, 33447, -36046, -50122, -34789, 43003, -78947, -38763, -89210, 32756,
+        -20389, -31358, -90526, -81607, 88741, 86643, 98422, 47389, -75189, 13091, 95993, -15501, 94260, -25584, -1483,
+        -67261, -70753, 25160, 89614, -90620, -48542, 83889, -12388, -9642, -37043, -67663, 28794, -8801, 13621, 12241,
+        55379, 84290, 21692, -95906, -85617, -17341, -63767, 80183, -4942, -51478, 30997, -13658, 8838, 17452, -82869,
+        -39897, 68449, 31964, 98158, -49489, 62283, -62209, -92792, -59342, 55146, -38533, 20496, 62667, 62593, 36095,
+        -12470, 5453, -50451, 74716, -17902, 3302, -16760, -71642, -34819, 96459, -72860, 21638, 47342, -69897, -40180,
+        44466, 76496, 84659, 13848, -91600, -90887, -63742, -2156, -84981, -99280, 94326, -33854, 92029, -50811, 98711,
+        -36459, -75555, 79110, -88164, -97397, -84217, 97457, 64387, 30513, -53190, -83215, 252, 2344, -27177, -92945,
+        -89010, 82662, -11670, 86069, 53417, 42702, 97082, 3695, -14530, -46334, 17910, 77999, 28009, -12374, 15498,
+        -46941, 97088, -35030, 95040, 92095, -59469, -24761, 46491, 67357, -66658, 37446, -65130, -50416, 99197, 30925,
+        27308, 54122, -44719, 12582, -99525, -38446, -69050, -22352, 94757, -56062, 33684, -40199, -46399, 96842,
+        -50881, -22380, -65021, 40582, 53623, -76034, 77018, -97074, -84838, -22953, -74205, 79715, -33920, -35794,
+        -91369, 73421, -82492, 63680, -14915, -33295, 37145, 76852, -69442, 60125, -74166, 74308, -1900, -30195, -16267,
+        -60781, -27760, 5852, 38917, 25742, -3765, 49097, -63541, 98612, -92865, -30248, 9612, -8798, 53262, 95781,
+        -42278, -36529, 7252, -27394, -5021, 59178, 80934, -48480, -75131, -54439, -19145, -48140, 98457, -6601, -51616,
+        -89730, 78028, 32083, -48904, 16822, -81153, -8832, 48720, -80728, -45133, -86647, -4259, -40453, 2590, 28613,
+        50523, -4105, -27790, -74579, -17223, 63721, 33489, -47921, 97628, -97691, -14782, -65644, 18008, -93651,
+        -71266, 80990, -76732, -47104, 35368, 28632, 59818, -86269, -89753, 34557, -92230, -5933, -3487, -73557, -13174,
+        -43981, -43630, -55171, 30254, -83710, -99583, -13500, 71787, 5017, -25117, -78586, 86941, -3251, -23867,
+        -36315, 75973, 86272, -45575, 77462, -98836, -10859, 70168, -32971, -38739, -12761, 93410, 14014, -30706,
+        -77356, -85965, -62316, 63918, -59914, -64088, 1591, -10957, 38004, 15129, -83602, -51791, 34381, -89382,
+        -26056, 8942, 5465, 71458, -73805, -87445, -19921, -80784, 69150, -34168, 28301, -68955, 18041, 6059, 82342,
+        9947, 39795, 44047, -57313, 48569, 81936, -2863, -80932, 32976, -86454, -84207, 33033, 32867, 9104, -16580,
+        -25727, 80157, -70169, 53741, 86522, 84651, 68480, 84018, 61932, 7332, -61322, -69663, 76370, 41206, 12326,
+        -34689, 17016, 82975, -23386, 39417, 72793, 44774, -96259, 3213, 79952, 29265, -61492, -49337, 14162, 65886,
+        3342, -41622, -62659, -90402, -24751, 88511, 54739, -21383, -40161, -96610, -24944, -602, -76842, -21856, 69964,
+        43994, -15121, -85530, 12718, 13170, -13547, 69222, 62417, -75305, -81446, -38786, -52075, -23110, 97681,
+        -82800, -53178, 11474, 35857, 94197, -58148, -23689, 32506, 92154, -64536, -73930, -77138, 97446, -83459, 70963,
+        22452, 68472, -3728, -25059, -49405, 95129, -6167, 12808, 99918, 30113, -12641, -26665, 86362, -33505, 50661,
+        26714, 33701, 89012, -91540, 40517, -12716, -57185, -87230, 29914, -59560, 13200, -72723, 58272, 23913, -45586,
+        -96593, -26265, -2141, 31087, 81399, 92511, -34049, 20577, 2803, 26003, 8940, 42117, 40887, -82715, 38269,
+        40969, -50022, 72088, 21291, -67280, -16523, 90535, 18669, 94342, -39568, -88080, -99486, -20716, 23108, -28037,
+        63342, 36863, -29420, -44016, 75135, 73415, 16059, -4899, 86893, 43136, -7041, 33483, -67612, 25327, 40830,
+        6184, 61805, 4247, 81119, -22854, -26104, -63466, 63093, -63685, 60369, 51023, 51644, -16350, 74438, -83514,
+        99083, 10079, -58451, -79621, 48471, 67131, -86940, 99093, 11855, -22272, -67683, -44371, 9541, 18123, 37766,
+        -70922, 80385, -57513, -76021, -47890, 36154, 72935, 84387, -92681, -88303, -7810, 59902, -90, -64704, -28396,
+        -66403, 8860, 13343, 33882, 85680, 7228, 28160, -14003, 54369, -58893, 92606, -63492, -10101, 64714, 58486,
+        29948, -44679, -22763, 10151, -56695, 4031, -18242, -36232, 86168, -14263, 9883, 47124, 47271, 92761, -24958,
+        -73263, -79661, -69147, -18874, 29546, -92588, -85771, 26451, -86650, -43306, -59094, -47492, -34821, -91763,
+        -47670, 33537, 22843, 67417, -759, 92159, 63075, 94065, -26988, 55276, 65903, 30414, -67129, -99508, -83092,
+        -91493, -50426, 14349, -83216, -76090, 32742, -5306, -93310, -60750, -60620, -45484, -21108, -58341, -28048,
+        -52803, 69735, 78906, 81649, 32565, -86804, -83202, -65688, -1760, 89707, 93322, -72750, 84134, 71900, -37720,
+        19450, -78018, 22001, -23604, 26276, -21498, 65892, -72117, -89834, -23867, 55817, -77963, 42518, 93123, -83916,
+        63260, -2243, -97108, 85442, -36775, 17984, -58810, 99664, -19082, 93075, -69329, 87061, 79713, 16296, 70996,
+        13483, -74582, 49900, -27669, -40562, 1209, -20572, 34660, 83193, 75579, 7344, 64925, 88361, 60969, 3114, 44611,
+        -27445, 53049, -16085, -92851, -53306, 13859, -33532, 86622, -75666, -18159, -98256, 51875, -42251, -27977,
+        -18080, 23772, 38160, 41779, 9147, 94175, 99905, -85755, 62535, -88412, -52038, -68171, 93255, -44684, -11242,
+        -104, 31796, 62346, -54931, -55790, -70032, 46221, 56541, -91947, 90592, 93503, 4071, 20646, 4856, -63598,
+        15396, -50708, 32138, -85164, 38528, -89959, 53852, 57915, -42421, -88916, -75072, 67030, -29066, 49542, -71591,
+        61708, -53985, -43051, 28483, 46991, -83216, 80991, -46254, -48716, 39356, -8270, -47763, -34410, 874, -1186,
+        -7049, 28846, 11276, 21960, -13304, -11433, -4913, 55754, 79616, 70423, -27523, 64803, 49277, 14906, -97401,
+        -92390, 91075, 70736, 21971, -3303, 55333, -93996, 76538, 54603, -75899, 98801, 46887, 35041, 48302, -52318,
+        55439, 24574, 14079, -24889, 83440, 14961, 34312, -89260, -22293, -81271, -2586, -71059, -10640, -93095, -5453,
+        -70041, 66543, 74012, -11662, -52477, -37597, -70919, 92971, -17452, -67306, -80418, 7225, -89296, 24296, 86547,
+        37154, -10696, 74436, -63959, 58860, 33590, -88925, -97814, -83664, 85484, -8385, -50879, 57729, -74728, -87852,
+        -15524, -91120, 22062, 28134, 80917, 32026, 49707, -54252, -44319, -35139, 13777, 44660, 85274, 25043, 58781,
+        -89035, -76274, 6364, -63625, 72855, 43242, -35033, 12820, -27460, 77372, -47578, -61162, -70758, -1343, -4159,
+        64935, 56024, -2151, 43770, 19758, -30186, -86040, 24666, -62332, -67542, 73180, -25821, -27826, -45504, -36858,
+        -12041, 20017, -24066, -56625, -52097, -47239, -90694, 8959, 7712, -14258, -5860, 55349, 61808, -4423, -93703,
+        64681, -98641, -25222, 46999, -83831, -54714, 19997, -68477, 66073, 51801, -66491, 52061, -52866, 79907, -39736,
+        -68331, 68937, 91464, 98892, 910, 93501, 31295, -85873, 27036, -57340, 50412, 21, -2445, 29471, 71317, 82093,
+        -94823, -54458, -97410, 39560, -7628, 66452, 39701, 54029, 37906, 46773, 58296, 60370, -61090, 85501, -86874,
+        71443, -72702, -72047, 14848, 34102, 77975, -66294, -36576, 31349, 52493, -70833, -80287, 94435, 39745, -98291,
+        84524, -18942, 10236, 93448, 50846, 94023, -6939, 47999, 14740, 30165, 81048, 84935, -19177, -13594, 32289,
+        62628, -90612, -542, -66627, 64255, 71199, -83841, -82943, -73885, 8623, -67214, -9474, -35249, 62254, -14087,
+        -90969, 21515, -83303, 94377, -91619, 19956, -98810, 96727, -91939, 29119, -85473, -82153, -69008, 44850, 74299,
+        -76459, -86464, 8315, -49912, -28665, 59052, -69708, 76024, -92738, 50098, 18683, -91438, 18096, -19335, 35659,
+        91826, 15779, -73070, 67873, -12458, -71440, -46721, 54856, 97212, -81875, 35805, 36952, 68498, 81627, -34231,
+        81712, 27100, -9741, -82612, 18766, -36392, 2759, 41728, 69743, 26825, 48355, -17790, 17165, 56558, 3295,
+        -24375, 55669, -16109, 24079, 73414, 48990, -11931, -78214, 90745, 19878, 35673, -15317, -89086, 94675, -92513,
+        88410, -93248, -19475, -74041, -19165, 32329, -26266, -46828, -18747, 45328, 8990, -78219, -25874, -74801,
+        -44956, -54577, -29756, -99822, -35731, -18348, -68915, -83518, -53451, 95471, -2954, -13706, -8763, -21642,
+        -37210, 16814, -60070, -42743, 27697, -36333, -42362, 11576, 85742, -82536, 68767, -56103, -63012, 71396,
+        -78464, -68101, -15917, -11113, -3596, 77626, -60191, -30585, -73584, 6214, -84303, 18403, 23618, -15619,
+        -89755, -59515, -59103, -74308, -63725, -29364, -52376, -96130, 70894, -12609, 50845, -2314, 42264, -70825,
+        64481, 55752, 4460, -68603, -88701, 4713, -50441, -51333, -77907, 97412, -66616, -49430, 60489, -85262, -97621,
+        -18980, 44727, -69321, -57730, 66287, -92566, -64427, -14270, 11515, -92612, -87645, 61557, 24197, -81923,
+        -39831, -10301, -23640, -76219, -68025, 92761, -76493, 68554, -77734, -95620, -11753, -51700, 98234, -68544,
+        -61838, 29467, 46603, -18221, -35441, 74537, 40327, -58293, 75755, -57301, -7532, -94163, 18179, -14388, -22258,
+        -46417, -48285, 18242, -77551, 82620, 250, -20060, -79568, -77259, 82052, -98897, -75464, 48773, -79040, -11293,
+        45941, -67876, -69204, -46477, -46107, 792, 60546, -34573, -12879, -94562, 20356, -48004, -62429, 96242, 40594,
+        2099, 99494, 25724, -39394, -2388, -18563, -56510, -83570, -29214, 3015, 74454, 74197, 76678, -46597, 60630,
+        -76093, 37578, -82045, -24077, 62082, -87787, -74936, 58687, 12200, -98952, 70155, -77370, 21710, -84625,
+        -60556, -84128, 925, 65474, -15741, -94619, 88377, 89334, 44749, 22002, -45750, -93081, -14600, -83447, 46691,
+        85040, -66447, -80085, 56308, 44310, 24979, -29694, 57991, 4675, -71273, -44508, 13615, -54710, 23552, -78253,
+        -34637, 50497, 68706, 81543, -88408, -21405, 6001, -33834, -21570, -46692, -25344, 20310, 71258, -97680, 11721,
+        59977, 59247, -48949, 98955, -50276, -80844, -27935, -76102, 55858, -33492, 40680, 66691, -33188, 8284, 64893,
+        -7528, 6019, -85523, 8434, -64366, -56663, 26862, 30008, -7611, -12179, -70076, 21426, -11261, -36864, -61937,
+        -59677, 929, -21052, 3848, -20888, -16065, 98995, -32293, -86121, -54564, 77831, 68602, 74977, 31658, 40699,
+        29755, 98424, 80358, -69337, 26339, 13213, -46016, -18331, 64713, -46883, -58451, -70024, -92393, -4088, 70628,
+        -51185, 71164, -75791, -1636, -29102, -16929, -87650, -84589, -24229, -42137, -15653, 94825, 13042, 88499,
+        -47100, -90358, -7180, 29754, -65727, -42659, -85560, -9037, -52459, 20997, -47425, 17318, 21122, 20472, -23037,
+        65216, -63625, -7877, -91907, 24100, -72516, 22903, -85247, -8938, 73878, 54953, 87480, -31466, -99524, 35369,
+        -78376, 89984, -15982, 94045, -7269, 23319, -80456, -37653, -76756, 2909, 81936, 54958, -12393, 60560, -84664,
+        -82413, 66941, -26573, -97532, 64460, 18593, -85789, -38820, -92575, -43663, -89435, 83272, -50585, 13616,
+        -71541, -53156, 727, -27644, 16538, 34049, 57745, 34348, 35009, 16634, -18791, 23271, -63844, 95817, 21781,
+        16590, 59669, 15966, -6864, 48050, -36143, 97427, -59390, 96931, 78939, -1958, 50777, 43338, -51149, 39235,
+        -27054, -43492, 67457, -83616, 37179, 10390, 85818, 2391, 73635, 87579, -49127, -81264, -79023, -81590, 53554,
+        -74972, -83940, -13726, -39095, 29174, 78072, 76104, 47778, 25797, -29515, -6493, -92793, 22481, -36197, -65560,
+        42342, 15750, 97556, 99634, -56048, -35688, 13501, 63969, -74291, 50911, 39225, 93702, -3490, -59461, -30105,
+        -46761, -80113, 92906, -68487, 50742, 36152, -90240, -83631, 24597, -50566, -15477, 18470, 77038, 40223, -80364,
+        -98676, 70957, -63647, 99537, 13041, 31679, 86631, 37633, -16866, 13686, -71565, 21652, -46053, -80578, -61382,
+        68487, -6417, 4656, 20811, 67013, -30868, -11219, 46, 74944, 14627, 56965, 42275, -52480, 52162, -84883, -52579,
+        -90331, 92792, 42184, -73422, -58440, 65308, -25069, 5475, -57996, 59557, -17561, 2826, -56939, 14996, -94855,
+        -53707, 99159, 43645, -67719, -1331, 21412, 41704, 31612, 32622, 1919, -69333, -69828, 22422, -78842, 57896,
+        -17363, 27979, -76897, 35008, 46482, -75289, 65799, 20057, 7170, 41326, -76069, 90840, -81253, -50749, 3649,
+        -42315, 45238, -33924, 62101, 96906, 58884, -7617, -28689, -66578, 62458, 50876, -57553, 6739, 41014, -64040,
+        -34916, 37940, 13048, -97478, -11318, -89440, -31933, -40357, -59737, -76718, -14104, -31774, 28001, 4103,
+        41702, -25120, -31654, 63085, -3642, 84870, -83896, -76422, -61520, 12900, 88678, 85547, 33132, -88627, 52820,
+        63915, -27472, 78867, -51439, 33005, -23447, -3271, -39308, 39726, -74260, -31874, -36893, 93656, 910, -98362,
+        60450, -88048, 99308, 13947, 83996, -90415, -35117, 70858, -55332, -31721, 97528, 82982, -86218, 6822, 25227,
+        36946, 97077, -4257, -41526, 56795, 89870, 75860, -70802, 21779, 14184, -16511, -89156, -31422, 71470, 69600,
+        -78498, 74079, -19410, 40311, 28501, 26397, -67574, -32518, 68510, 38615, 19355, -6088, -97159, -29255, -92523,
+        3023, -42536, -88681, 64255, 41206, 44119, 52208, 39522, -52108, 91276, -70514, 83436, 63289, -79741, 9623,
+        99559, 12642, 85950, 83735, -21156, -67208, 98088, -7341, -27763, -30048, -44099, -14866, -45504, -91704, 19369,
+        13700, 10481, -49344, -85686, 33994, 19672, 36028, 60842, 66564, -24919, 33950, -93616, -47430, -35391, -28279,
+        56806, 74690, 39284, -96683, -7642, -75232, 37657, -14531, -86870, -9274, -26173, 98640, 88652, 64257, 46457,
+        37814, -19370, 9337, -22556, -41525, 39105, -28719, 51611, -93252, 98044, -90996, 21710, -47605, -64259, -32727,
+        53611, -31918, -3555, 33316, -66472, 21274, -37731, -2919, 15016, 48779, -88868, 1897, 41728, 46344, -89667,
+        37848, 68092, -44011, 85354, -43776, 38739, -31423, -66330, 65167, -22016, 59405, 34328, -60042, 87660, -67698,
+        -59174, -1408, -46809, -43485, -88807, -60489, 13974, 22319, 55836, -62995, -37375, -4185, 32687, -36551,
+        -75237, 58280, 26942, -73756, 71756, 78775, -40573, 14367, -71622, -77338, 24112, 23414, -7679, -51721, 87492,
+        85066, -21612, 57045, 10673, -96836, 52461, -62218, -9310, 65862, -22748, 89906, -96987, -98698, 26956, -43428,
+        46141, 47456, 28095, 55952, 67323, -36455, -60202, -43302, -82932, 42020, 77036, 10142, 60406, 70331, 63836,
+        58850, -66752, 52109, 21395, -10238, -98647, -41962, 27778, 69060, 98535, -28680, -52263, -56679, 66103, -42426,
+        27203, 80021, 10153, 58678, 36398, 63112, 34911, 20515, 62082, -15659, -40785, 27054, 43767, -20289, 65838,
+        -6954, -60228, -72226, 52236, -35464, 25209, -15462, -79617, -41668, -84083, 62404, -69062, 18913, 46545, 20757,
+        13805, 24717, -18461, -47009, -25779, 68834, 64824, 34473, 39576, 31570, 14861, -15114, -41233, 95509, 68232,
+        67846, 84902, -83060, 17642, -18422, 73688, 77671, -26930, 64484, -99637, 73875, 6428, 21034, -73471, 19664,
+        -68031, 15922, -27028, 48137, 54955, -82793, -41144, -10218, -24921, -28299, -2288, 68518, -54452, 15686,
+        -41814, 66165, -72207, -61986, 80020, 50544, -99500, 16244, 78998, 40989, 14525, -56061, -24692, -94790, 21111,
+        37296, -90794, 72100, 70550, -31757, 17708, -74290, 61910, 78039, -78629, -25033, 73172, -91953, 10052, 64502,
+        99585, -1741, 90324, -73723, 68942, 28149, 30218, 24422, 16659, 10710, -62594, 94249, 96588, 46192, 34251,
+        73500, -65995, -81168, 41412, -98724, -63710, -54696, -52407, 19746, 45869, 27821, -94866, -76705, -13417,
+        -61995, -71560, 43450, 67384, -8838, -80293, -28937, 23330, -89694, -40586, 46918, 80429, -5475, 78013, 25309,
+        -34162, 37236, -77577, 86744, 26281, -29033, -91813, 35347, 13033, -13631, -24459, 3325, -71078, -75359, 81311,
+        19700, 47678, -74680, -84113, 45192, 35502, 37675, 19553, 76522, -51098, -18211, 89717, 4508, -82946, 27749,
+        85995, 89912, -53678, -64727, -14778, 32075, -63412, -40524, 86440, -2707, -36821, 63850, -30883, 67294, -99468,
+        -23708, 34932, 34386, 98899, 29239, -23385, 5897, 54882, 98660, 49098, 70275, 17718, 88533, 52161, 63340, 50061,
+        -89457, 19491, -99156, 24873, -17008, 64610, -55543, 50495, 17056, -10400, -56678, -29073, -42960, -76418,
+        98562, -88104, -96255, 10159, -90724, 54011, 12052, 45871, -90933, -69420, 67039, 37202, 78051, -52197, -40278,
+        -58425, 65414, -23394, -1415, 6912, -53447, 7352, 17307, -78147, 63727, 98905, 55412, -57658, -32884, -44878,
+        22755, 39730, 3638, 35111, 39777, 74193, 38736, -11829, -61188, -92757, 55946, -71232, -63032, -83947, 39147,
+        -96684, -99233, 25131, -32197, 24406, -55428, -61941, 25874, -69453, 64483, -19644, -68441, 12783, 87338,
+        -48676, 66451, -447, -61590, 50932, -11270, 29035, 65698, -63544, 10029, 80499, -9461, 86368, 91365, -81810,
+        -71914, -52056, -13782, 44240, -30093, -2437, 24007, 67581, -17365, -69164, -8420, -69289, -29370, 48010, 90439,
+        13141, 69243, 50668, 39328, 61731, 78266, -81313, 17921, -38196, 55261, 9948, -24970, 75712, -72106, 28696,
+        7461, 31621, 61047, 51476, 56512, 11839, -96916, -82739, 28924, -99927, 58449, 37280, 69357, 11219, -32119,
+        -62050, -48745, -83486, -52376, 42668, 82659, 68882, 38773, 46269, -96005, 97630, 25009, -2951, -67811, 99801,
+        81587, -79793, -18547, -83086, 69512, 33127, -92145, -88497, 47703, 59527, 1909, 88785, -88882, 69188, -46131,
+        -5589, -15086, 36255, -53238, -33009, 82664, 53901, 35939, -42946, -25571, 33298, 69291, 53199, 74746, -40127,
+        -39050, 91033, 51717, -98048, 87240, 36172, 65453, -94425, -63694, -30027, 59004, 88660, 3649, -20267, -52565,
+        -67321, 34037, 4320, 91515, -56753, 60115, 27134, 68617, -61395, -26503, -98929, -8849, -63318, 10709, -16151,
+        61905, -95785, 5262, 23670, -25277, 90206, -19391, 45735, 37208, -31992, -92450, 18516, -90452, -58870, -58602,
+        93383, 14333, 17994, 82411, -54126, -32576, 35440, -60526, -78764, -25069, -9022, -394, 92186, -38057, 55328,
+        -61569, 67780, 77169, 19546, -92664, -94948, 44484, -13439, 83529, 27518, -48333, 72998, 38342, -90553, -98578,
+        -76906, 81515, -16464, 78439, 92529, 35225, -39968, -10130, -7845, -32245, -74955, -74996, 67731, -13897,
+        -82493, 33407, 93619, 59560, -24404, -57553, 19486, -45341, 34098, -24978, -33612, 79058, 71847, 76713, -95422,
+        6421, -96075, -59130, -28976, -16922, -62203, 69970, 68331, 21874, 40551, 89650, 51908, 58181, 66480, -68177,
+        34323, -3046, -49656, -59758, 43564, -10960, -30796, 15473, -20216, 46085, -85355, 41515, -30669, -87498, 57711,
+        56067, 63199, -83805, 62042, 91213, -14606, 4394, -562, 74913, 10406, 96810, -61595, 32564, 31640, -9732, 42058,
+        98052, -7908, -72330, 1558, -80301, 34878, 32900, 3939, -8824, 88316, 20937, 21566, -3218, -66080, -31620,
+        86859, 54289, 90476, -42889, -15016, -18838, 75456, 30159, -67101, 42328, -92703, 85850, -5475, 23470, -80806,
+        68206, 17764, 88235, 46421, -41578, 74005, -81142, 80545, 20868, -1560, 64017, 83784, 68863, -97516, -13016,
+        -72223, 79630, -55692, 82255, 88467, 28007, -34686, -69049, -41677, 88535, -8217, 68060, -51280, 28971, 49088,
+        49235, 26905, -81117, -44888, 40623, 74337, -24662, 97476, 79542, -72082, -35093, 98175, -61761, -68169, 59697,
+        -62542, -72965, 59883, -64026, -37656, -92392, -12113, -73495, 98258, 68379, -21545, 64607, -70957, -92254,
+        -97460, -63436, -8853, -19357, -51965, -76582, 12687, -49712, 45413, -60043, 33496, 31539, -57347, 41837, 67280,
+        -68813, 52088, -13155, -86430, -15239, -45030, 96041, 18749, -23992, 46048, 35243, -79450, 85425, -58524, 88781,
+        -39454, 53073, -48864, -82289, 39086, 82540, -11555, 25014, -5431, -39585, -89526, 2705, 31953, -81611, 36985,
+        -56022, 68684, -27101, 11422, 64655, -26965, -63081, -13840, -91003, -78147, -8966, 41488, 1988, 99021, -61575,
+        -47060, 65260, -23844, -21781, -91865, -19607, 44808, 2890, 63692, -88663, -58272, 15970, -65195, -45416,
+        -48444, -78226, -65332, -24568, 42833, -1806, -71595, 80002, -52250, 30952, 48452, -90106, 31015, -22073, 62339,
+        63318, 78391, 28699, 77900, -4026, -76870, -45943, 33665, 9174, -84360, -22684, -16832, -67949, -38077, -38987,
+        -32847, 51443, -53580, -13505, 9344, -92337, 26585, 70458, -52764, -67471, -68411, -1119, -2072, -93476, 67981,
+        40887, -89304, -12235, 41488, 1454, 5355, -34855, -72080, 24514, -58305, 3340, 34331, 8731, 77451, -64983,
+        -57876, 82874, 62481, -32754, -39902, 22451, -79095, -23904, 78409, -7418, 77916]
+
+print(threeSum([-1,0,1,2,-1,-4]))
+''.endswith()
\ No newline at end of file