Two Tasks

.idea/.idea.Leetcode/.idea/workspace.xml

@@ -15,6 +15,7 @@
     <projectFile>144. Binary Tree Preorder Traversal/144. Binary Tree Preorder Traversal.csproj</projectFile>
     <projectFile>145. Binary Tree Postorder Traversal/145. Binary Tree Postorder Traversal.csproj</projectFile>
     <projectFile>1480. Running Sum of 1d Array/1480. Running Sum of 1d Array.csproj</projectFile>
+    <projectFile>15. 3Sum/15. 3Sum.csproj</projectFile>
     <projectFile>167. Two Sum II - Input Array Is Sorted/167. Two Sum II - Input Array Is Sorted.csproj</projectFile>
     <projectFile>189. Rotate Array/189. Rotate Array.csproj</projectFile>
     <projectFile>19. Remove Nth Node From End of List/19. Remove Nth Node From End of List.csproj</projectFile>
@@ -72,6 +73,7 @@
     <projectFile>746. Min Cost Climbing Stairs/746. Min Cost Climbing Stairs.csproj</projectFile>
     <projectFile>77. Combinations/77. Combinations.csproj</projectFile>
     <projectFile>784. Letter Case Permutation/784. Letter Case Permutation.csproj</projectFile>
+    <projectFile>8. String to Integer (atoi)/8. String to Integer (atoi).csproj</projectFile>
     <projectFile>83. Remove Duplicates from Sorted List/83. Remove Duplicates from Sorted List.csproj</projectFile>
     <projectFile>876. Middle of the Linked List/876. Middle of the Linked List.csproj</projectFile>
     <projectFile>88. Merge Sorted Array/88. Merge Sorted Array.csproj</projectFile>
@@ -82,6 +84,20 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="11f2de1c-1ee5-4aa4-91e6-11975ebd421f" name="Changes" comment="">
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/encodings.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/indexLayout.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/projectSettingsUpdater.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/workspace.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/15. 3Sum.csproj" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/Program.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/15. 3Sum/Solution.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/encodings.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/indexLayout.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/projectSettingsUpdater.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/workspace.xml" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/8. String to Integer (atoi).csproj" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/Program.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/8. String to Integer (atoi)/Solution.cs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/.idea.Leetcode/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/.idea.Leetcode/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/Leetcode.sln" beforeDir="false" afterPath="$PROJECT_DIR$/Leetcode.sln" afterDir="false" />
     </list>
@@ -90,20 +106,29 @@
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
+  <component name="HighlightingSettingsPerFile">
+    <setting file="file://$APPLICATION_CONFIG_DIR$/resharper-host/DecompilerCache/decompiler/527a2dcd76ec41ecb0820c0926ad20f7a28600/75/a9f2af7b/Dictionary`2.cs" root0="SKIP_HIGHLIGHTING" />
+    <setting file="file://$APPLICATION_CONFIG_DIR$/resharper-host/DecompilerCache/decompiler/527a2dcd76ec41ecb0820c0926ad20f7a28600/f4/54bf738e/ThrowHelper.cs" root0="SKIP_HIGHLIGHTING" />
+  </component>
   <component name="MarkdownSettingsMigration">
     <option name="stateVersion" value="1" />
   </component>
   <component name="ProjectId" id="2MbItycivFzycjT9hquXZe9USRT" />
+  <component name="ProjectLevelVcsManager">
+    <ConfirmationsSetting value="2" id="Add" />
+  </component>
   <component name="ProjectViewState">
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
   <component name="PropertiesComponent"><![CDATA[{
   "keyToString": {
+    "ASKED_ADD_EXTERNAL_FILES": "true",
     "RunOnceActivity.OpenProjectViewOnStart": "true",
     "RunOnceActivity.ShowReadmeOnStart": "true",
     "WebServerToolWindowFactoryState": "false",
-    "last_opened_file_path": "/home/nullptr/Projects/dotNET/Leetcode/6. Zigzag Conversion/6. Zigzag Conversion.csproj",
+    "last_opened_file_path": "/home/nullptr/Projects/dotnet/Leetcode/15. 3Sum/15. 3Sum.csproj",
+    "nodejs_package_manager_path": "npm",
     "settings.editor.selected.configurable": "SolutionBuilderGeneralOptionsPage",
     "vue.rearranger.settings.migration": "true"
   },
@@ -115,7 +140,7 @@
     ]
   }
 }]]></component>
-  <component name="RunManager" selected=".NET Project.6. Zigzag Conversion">
+  <component name="RunManager" selected=".NET Project.15. 3Sum">
     <configuration name="101. Symmetric Tree" type="DotNetProject" factoryName=".NET Project">
       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -350,6 +375,24 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="15. 3Sum" type="DotNetProject" factoryName=".NET Project">
+      <option name="EXE_PATH" value="" />
+      <option name="PROGRAM_PARAMETERS" value="" />
+      <option name="WORKING_DIRECTORY" value="" />
+      <option name="PASS_PARENT_ENVS" value="1" />
+      <option name="USE_EXTERNAL_CONSOLE" value="0" />
+      <option name="USE_MONO" value="0" />
+      <option name="RUNTIME_ARGUMENTS" value="" />
+      <option name="PROJECT_PATH" value="$PROJECT_DIR$/15. 3Sum/15. 3Sum.csproj" />
+      <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+      <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+      <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+      <option name="PROJECT_KIND" value="DotNetCore" />
+      <option name="PROJECT_TFM" value="" />
+      <method v="2">
+        <option name="Build" />
+      </method>
+    </configuration>
     <configuration name="167. Two Sum II - Input Array Is Sorted" type="DotNetProject" factoryName=".NET Project">
       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -1448,6 +1491,24 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="8. String to Integer (atoi)" type="DotNetProject" factoryName=".NET Project">
+      <option name="EXE_PATH" value="" />
+      <option name="PROGRAM_PARAMETERS" value="" />
+      <option name="WORKING_DIRECTORY" value="" />
+      <option name="PASS_PARENT_ENVS" value="1" />
+      <option name="USE_EXTERNAL_CONSOLE" value="0" />
+      <option name="USE_MONO" value="0" />
+      <option name="RUNTIME_ARGUMENTS" value="" />
+      <option name="PROJECT_PATH" value="$PROJECT_DIR$/8. String to Integer (atoi)/8. String to Integer (atoi).csproj" />
+      <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+      <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+      <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+      <option name="PROJECT_KIND" value="DotNetCore" />
+      <option name="PROJECT_TFM" value="" />
+      <method v="2">
+        <option name="Build" />
+      </method>
+    </configuration>
     <configuration name="94. Binary Tree Inorder Traversal" type="DotNetProject" factoryName=".NET Project">
       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -1530,6 +1591,7 @@
       <option name="presentableId" value="Default" />
       <updated>1678030074860</updated>
       <workItem from="1678030078340" duration="114000" />
+      <workItem from="1680804946367" duration="3697000" />
     </task>
     <servers />
   </component>
@@ -1538,6 +1600,7 @@
   </component>
   <component name="UnityUnitTestConfiguration" currentTestLauncher="NUnit" />
   <component name="VcsManagerConfiguration">
+    <option name="ADD_EXTERNAL_FILES_SILENTLY" value="true" />
     <option name="CLEAR_INITIAL_COMMIT_MESSAGE" value="true" />
   </component>
 </project>

15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/projectSettingsUpdater.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RiderProjectSettingsUpdater">
+    <option name="vcsConfiguration" value="2" />
+  </component>
+</project>

15. 3Sum/.idea/.idea.OldConsoleTemplate.dir/.idea/workspace.xml

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoGeneratedRunConfigurationManager">
+    <projectFile>_15._3Sum.csproj</projectFile>
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="82866301-1c54-48b2-9c86-912478ff5746" name="Changes" comment="" />
+    <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="ProjectId" id="2NSm8ypYphrjURy5OrzoEQDZIRZ" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;WebServerToolWindowFactoryState&quot;: &quot;false&quot;,
+    &quot;settings.editor.selected.configurable&quot;: &quot;SolutionBuilderGeneralOptionsPage&quot;,
+    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;
+  }
+}</component>
+  <component name="RunManager">
+    <configuration name="_15._3Sum" type="DotNetProject" factoryName=".NET Project">
+      <option name="EXE_PATH" value="" />
+      <option name="PROGRAM_PARAMETERS" value="" />
+      <option name="WORKING_DIRECTORY" value="" />
+      <option name="PASS_PARENT_ENVS" value="1" />
+      <option name="USE_EXTERNAL_CONSOLE" value="0" />
+      <option name="USE_MONO" value="0" />
+      <option name="RUNTIME_ARGUMENTS" value="" />
+      <option name="PROJECT_PATH" value="$PROJECT_DIR$/_15._3Sum.csproj" />
+      <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+      <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+      <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+      <option name="PROJECT_KIND" value="DotNetCore" />
+      <option name="PROJECT_TFM" value="" />
+      <method v="2">
+        <option name="Build" />
+      </method>
+    </configuration>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="82866301-1c54-48b2-9c86-912478ff5746" name="Changes" comment="" />
+      <created>1679665701935</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1679665701935</updated>
+      <workItem from="1679665703808" duration="5000" />
+      <workItem from="1680292231454" duration="4000" />
+    </task>
+    <servers />
+  </component>
+  <component name="UnityUnitTestConfiguration" currentTestLauncher="NUnit" />
+  <component name="VcsManagerConfiguration">
+    <option name="CLEAR_INITIAL_COMMIT_MESSAGE" value="true" />
+  </component>
+</project>

15. 3Sum/15. 3Sum.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+    </PropertyGroup>
+
+</Project>

15. 3Sum/Program.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace _15._3Sum;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        var res = new Solution().ThreeSum(new int[]{-3,0,-5,2,-4,-2,1,-2,-1,3,1,3,1,3,-3,-5,1});
+        foreach (var list in res)
+        {
+            Console.WriteLine(String.Join(" ", list));
+        }
+    }
+}

15. 3Sum/Solution.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace _15._3Sum;
+
+public class Solution {
+    
+    class SequenceComparer<T>:IEqualityComparer<IEnumerable<T>>
+    {
+        public bool Equals(IEnumerable<T> seq1,IEnumerable<T> seq2)
+        {
+            return seq1.SequenceEqual(seq2);
+        }
+    
+        public int GetHashCode(IEnumerable<T> seq)
+        {
+            int hash = 1234567;
+            foreach(T elem in seq)
+                hash = unchecked(hash * 37 + elem.GetHashCode());
+            return hash;
+        }
+    }
+    
+    public IList<IList<int>> ThreeSum(int[] nums)
+    {
+        Dictionary<int, int> dict = new Dictionary<int, int>();
+        foreach (var num in nums)
+        {
+            if (dict.ContainsKey(num))
+                dict[num]++;
+            else
+                dict.Add(num, 1);
+        }
+        HashSet<IList<int>> answer = new HashSet<IList<int>>(new SequenceComparer<int>());
+        int[] keys = dict.Keys.ToArray();
+        for (int i = 0; i < keys.Length; i++)
+        {
+            int countI = dict[keys[i]]-1;
+            for (int j = i; j < keys.Length; j++)
+            {
+                int countJ = j == i ? (countI-1) : (dict[keys[j]]-1);
+                int v1 = keys[i];
+                int v2 = keys[j];
+                int v3 = -(v1+v2);
+                if (v3 == v1)
+                    countI--;
+                if (v3 == v2)
+                    countJ--;
+                bool can = dict.ContainsKey(v3);
+                if (can && countI >= 0 && countJ >= 0)
+                {
+                    var list = new List<int>() { v1, v2, v3 };
+                    list.Sort();
+                    answer.Add(list);
+                }
+                countI = dict[keys[i]]-1;
+            }
+        }
+        
+        return answer.ToList();
+    }
+}

8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/projectSettingsUpdater.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RiderProjectSettingsUpdater">
+    <option name="vcsConfiguration" value="2" />
+  </component>
+</project>

8. String to Integer (atoi)/.idea/.idea.OldConsoleTemplate.dir/.idea/workspace.xml

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoGeneratedRunConfigurationManager">
+    <projectFile>_8._String_to_Integer__atoi_.csproj</projectFile>
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="82866301-1c54-48b2-9c86-912478ff5746" name="Changes" comment="" />
+    <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="ProjectId" id="2NSm8ypYphrjURy5OrzoEQDZIRZ" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;WebServerToolWindowFactoryState&quot;: &quot;false&quot;,
+    &quot;settings.editor.selected.configurable&quot;: &quot;SolutionBuilderGeneralOptionsPage&quot;,
+    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;
+  }
+}</component>
+  <component name="RunManager">
+    <configuration name="_8._String_to_Integer__atoi_" type="DotNetProject" factoryName=".NET Project">
+      <option name="EXE_PATH" value="" />
+      <option name="PROGRAM_PARAMETERS" value="" />
+      <option name="WORKING_DIRECTORY" value="" />
+      <option name="PASS_PARENT_ENVS" value="1" />
+      <option name="USE_EXTERNAL_CONSOLE" value="0" />
+      <option name="USE_MONO" value="0" />
+      <option name="RUNTIME_ARGUMENTS" value="" />
+      <option name="PROJECT_PATH" value="$PROJECT_DIR$/_8._String_to_Integer__atoi_.csproj" />
+      <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
+      <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
+      <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+      <option name="PROJECT_KIND" value="DotNetCore" />
+      <option name="PROJECT_TFM" value="" />
+      <method v="2">
+        <option name="Build" />
+      </method>
+    </configuration>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="82866301-1c54-48b2-9c86-912478ff5746" name="Changes" comment="" />
+      <created>1679665701935</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1679665701935</updated>
+      <workItem from="1679665703808" duration="5000" />
+      <workItem from="1680292231454" duration="4000" />
+    </task>
+    <servers />
+  </component>
+  <component name="UnityUnitTestConfiguration" currentTestLauncher="NUnit" />
+  <component name="VcsManagerConfiguration">
+    <option name="CLEAR_INITIAL_COMMIT_MESSAGE" value="true" />
+  </component>
+</project>

8. String to Integer (atoi)/8. String to Integer (atoi).csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+    </PropertyGroup>
+
+</Project>

8. String to Integer (atoi)/Program.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace _8._String_to_Integer__atoi_;
+
+class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine(new Solution().MyAtoi(" "));
+    }
+}

8. String to Integer (atoi)/Solution.cs

@@ -0,0 +1,27 @@
+using System.Numerics;
+
+namespace _8._String_to_Integer__atoi_;
+
+public class Solution {
+    public int MyAtoi(string s)
+    {
+        if (string.IsNullOrEmpty(s))
+            return 0;
+        BigInteger res = 0;
+        int index = 0;
+        while (index<s.Length && s[index] == ' ')
+            index++;
+        bool negative = index<s.Length && s[index] == '-';
+        if (index<s.Length && "+-".Contains(s[index]))
+            index++;
+        while (index<s.Length && char.IsDigit(s[index]))
+            res = res * 10 + s[index++]-'0';
+        if (negative)
+            res *= -1;
+        if (res > int.MaxValue)
+            return int.MaxValue;
+        if (res < int.MinValue)
+            return int.MinValue;
+        return (int)res;
+    }
+}

Leetcode.sln

@@ -159,6 +159,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "4. Median of Two Sorted Arr
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "6. Zigzag Conversion", "6. Zigzag Conversion\6. Zigzag Conversion.csproj", "{4C15CB37-485C-4CD0-9BD4-D713CC744ECC}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "8. String to Integer (atoi)", "8. String to Integer (atoi)\8. String to Integer (atoi).csproj", "{D6AEC02C-3EF2-4BE8-9C13-7F511FC9F9E7}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "15. 3Sum", "15. 3Sum\15. 3Sum.csproj", "{4FAFB0B1-A240-44B9-8305-3CA7FED8AE3C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -477,6 +481,14 @@ Global
 		{4C15CB37-485C-4CD0-9BD4-D713CC744ECC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{4C15CB37-485C-4CD0-9BD4-D713CC744ECC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{4C15CB37-485C-4CD0-9BD4-D713CC744ECC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D6AEC02C-3EF2-4BE8-9C13-7F511FC9F9E7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D6AEC02C-3EF2-4BE8-9C13-7F511FC9F9E7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D6AEC02C-3EF2-4BE8-9C13-7F511FC9F9E7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D6AEC02C-3EF2-4BE8-9C13-7F511FC9F9E7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4FAFB0B1-A240-44B9-8305-3CA7FED8AE3C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4FAFB0B1-A240-44B9-8305-3CA7FED8AE3C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4FAFB0B1-A240-44B9-8305-3CA7FED8AE3C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4FAFB0B1-A240-44B9-8305-3CA7FED8AE3C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE