dotnet 8.0

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

@@ -15,6 +15,7 @@
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     <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>
@@ -29,6 +30,7 @@
     <projectFile>206. Reverse Linked List/206. Reverse Linked List.csproj</projectFile>
     <projectFile>21. Merge Two Sorted Lists/21. Merge Two Sorted Lists.csproj</projectFile>
     <projectFile>217. Contains Duplicate/217. Contains Duplicate.csproj</projectFile>
+    <projectFile>225. Implement Stack using Queues/225. Implement Stack using Queues.csproj</projectFile>
     <projectFile>226. Invert Binary Tree/226. Invert Binary Tree.csproj</projectFile>
     <projectFile>231. Power of Two/231. Power of Two.csproj</projectFile>
     <projectFile>232. Implement Queue using Stacks/232. Implement Queue using Stacks.csproj</projectFile>
@@ -40,6 +42,7 @@
     <projectFile>299. Bulls and Cows/299. Bulls and Cows.csproj</projectFile>
     <projectFile>3. Longest Substring Without Repeating Characters/3. Longest Substring Without Repeating Characters.csproj</projectFile>
     <projectFile>344. Reverse String/344. Reverse String.csproj</projectFile>
+    <projectFile>347. Top K Frequent Elements/347. Top K Frequent Elements.csproj</projectFile>
     <projectFile>35. Search Insert Position/35. Search Insert Position.csproj</projectFile>
     <projectFile>350. Intersection of Two Arrays II/350. Intersection of Two Arrays II.csproj</projectFile>
     <projectFile>36. Valid Sudoku/36. Valid Sudoku.csproj</projectFile>
@@ -50,6 +53,7 @@
     <projectFile>409. Longest Palindrome/409. Longest Palindrome.csproj</projectFile>
     <projectFile>424. Longest Repeating Character Replacement/424. Longest Repeating Character Replacement.csproj</projectFile>
     <projectFile>438. Find All Anagrams in a String/438. Find All Anagrams in a String.csproj</projectFile>
+    <projectFile>451. Sort Characters By Frequency/451. Sort Characters By Frequency.csproj</projectFile>
     <projectFile>46. Permutations/46. Permutations.csproj</projectFile>
     <projectFile>509. Fibonacci Number/509. Fibonacci Number.csproj</projectFile>
     <projectFile>53. Maximum Subarray/53. Maximum Subarray.csproj</projectFile>
@@ -72,6 +76,7 @@
     <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>
@@ -80,8 +85,14 @@
     <projectFile>98. Validate Binary Search Tree/98. Validate Binary Search Tree.csproj</projectFile>
     <projectFile>994. Rotting Oranges/994. Rotting Oranges.csproj</projectFile>
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+  </component>
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+      <change afterPath="$PROJECT_DIR$/347. Top K Frequent Elements/Program.cs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/347. Top K Frequent Elements/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" />
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@@ -90,32 +101,61 @@
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
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+  </component>
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+    <setting file="file://$PROJECT_DIR$/14. Longest Common Prefix/Solution.cs" root0="FORCE_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/225. Implement Stack using Queues/MyStack.cs" root0="SKIP_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/225. Implement Stack using Queues/Program.cs" root0="SKIP_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/232. Implement Queue using Stacks/MyQueue.cs" root0="SKIP_HIGHLIGHTING" />
+    <setting file="file://$PROJECT_DIR$/232. Implement Queue using Stacks/Program.cs" root0="SKIP_HIGHLIGHTING" />
+  </component>
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     <option name="stateVersion" value="1" />
   </component>
+  <component name="ProjectColorInfo">{
+  &quot;associatedIndex&quot;: 3
+}</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": {
+    ".NET Project.14. Longest Common Prefix.executor": "Run",
+    ".NET Project.150. Evaluate Reverse Polish Notation.executor": "Run",
+    ".NET Project.347. Top K Frequent Elements.executor": "Run",
+    ".NET Project.451. Sort Characters By Frequency.executor": "Run",
+    ".NET Project.9. Palindrome Number.executor": "Run",
+    "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",
+    "git-widget-placeholder": "main",
+    "last_opened_file_path": "/home/nullptr/Projects/dotnet/Leetcode/15. 3Sum/15. 3Sum.csproj",
+    "node.js.detected.package.eslint": "true",
+    "node.js.detected.package.tslint": "true",
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+    "node.js.selected.package.tslint": "(autodetect)",
+    "nodejs_package_manager_path": "npm",
     "settings.editor.selected.configurable": "SolutionBuilderGeneralOptionsPage",
     "vue.rearranger.settings.migration": "true"
   },
   "keyToStringList": {
     "rider.external.source.directories": [
-      "/home/nullptr/.config/JetBrains/Rider2022.3/resharper-host/DecompilerCache",
+      "/home/nullptr/.config/JetBrains/Rider2023.3/resharper-host/DecompilerCache",
-      "/home/nullptr/.config/JetBrains/Rider2022.3/resharper-host/SourcesCache",
+      "/home/nullptr/.config/JetBrains/Rider2023.3/resharper-host/SourcesCache",
       "/home/nullptr/.local/share/Symbols/src"
     ]
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 }]]></component>
-  <component name="RunManager" selected=".NET Project.6. Zigzag Conversion">
+  <component name="RunManager" selected=".NET Project.347. Top K Frequent Elements">
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       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -350,6 +390,60 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="14. Longest Common Prefix" type="DotNetProject" factoryName=".NET Project" temporary="true">
+      <option name="EXE_PATH" value="$PROJECT_DIR$/14. Longest Common Prefix/bin/Debug/net8.0/14. Longest Common Prefix" />
+      <option name="PROGRAM_PARAMETERS" value="" />
+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/14. Longest Common Prefix/bin/Debug/net8.0" />
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+      <option name="PROJECT_PATH" value="$PROJECT_DIR$/14. Longest Common Prefix/14. Longest Common Prefix.csproj" />
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+      <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+      <option name="PROJECT_KIND" value="DotNetCore" />
+      <option name="PROJECT_TFM" value="net8.0" />
+      <method v="2">
+        <option name="Build" />
+      </method>
+    </configuration>
+    <configuration name="150. Evaluate Reverse Polish Notation" type="DotNetProject" factoryName=".NET Project" temporary="true">
+      <option name="EXE_PATH" value="$PROJECT_DIR$/150. Evaluate Reverse Polish Notation/bin/Debug/net8.0/150. Evaluate Reverse Polish Notation" />
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+      <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="1" />
+      <option name="PROJECT_KIND" value="DotNetCore" />
+      <option name="PROJECT_TFM" value="net8.0" />
+      <method v="2">
+        <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="" />
@@ -602,6 +696,24 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="225. Implement Stack using Queues" 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="$PROJECT_DIR$/225. Implement Stack using Queues/225. Implement Stack using Queues.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="226. Invert Binary Tree" type="DotNetProject" factoryName=".NET Project">
       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -800,6 +912,24 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="347. Top K Frequent Elements" 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="$PROJECT_DIR$/347. Top K Frequent Elements/347. Top K Frequent Elements.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="350. Intersection of Two Arrays II" type="DotNetProject" factoryName=".NET Project">
       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -980,6 +1110,24 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="451. Sort Characters By Frequency" 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="$PROJECT_DIR$/451. Sort Characters By Frequency/451. Sort Characters By Frequency.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="46. Permutations" type="DotNetProject" factoryName=".NET Project">
       <option name="EXE_PATH" value="" />
       <option name="PROGRAM_PARAMETERS" value="" />
@@ -1448,6 +1596,24 @@
         <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="" />
@@ -1520,6 +1686,31 @@
         <option name="Build" />
       </method>
     </configuration>
+    <configuration name="9. Palindrome Number" type="DotNetProject" factoryName=".NET Project" temporary="true">
+      <option name="EXE_PATH" value="$PROJECT_DIR$/9. Palindrome Number/bin/Debug/net8.0/9. Palindrome Number" />
+      <option name="PROGRAM_PARAMETERS" value="" />
+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/9. Palindrome Number/bin/Debug/net8.0" />
+      <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="$PROJECT_DIR$/9. Palindrome Number/9. Palindrome Number.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="net8.0" />
+      <method v="2">
+        <option name="Build" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue=".NET Project.9. Palindrome Number" />
+        <item itemvalue=".NET Project.150. Evaluate Reverse Polish Notation" />
+        <item itemvalue=".NET Project.14. Longest Common Prefix" />
+      </list>
+    </recent_temporary>
   </component>
   <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
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@@ -1530,6 +1721,9 @@
       <option name="presentableId" value="Default" />
       <updated>1678030074860</updated>
       <workItem from="1678030078340" duration="114000" />
+      <workItem from="1680804946367" duration="3697000" />
+      <workItem from="1706644472303" duration="7903000" />
+      <workItem from="1707331420927" duration="3074000" />
     </task>
     <servers />
   </component>
@@ -1538,6 +1732,7 @@
   </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>

1. Two Sum/1. Two Sum.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_1._Two_Sum</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

101. Symmetric Tree/101. Symmetric Tree.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_101._Symmetric_Tree</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

102. Binary Tree Level Order Traversal/102. Binary Tree Level Order Traversal.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_102._Binary_Tree_Level_Order_Traversal</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

104. Maximum Depth of Binary Tree/104. Maximum Depth of Binary Tree.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_104._Maximum_Depth_of_Binary_Tree</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

112. Path Sum/112. Path Sum.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_112._Path_Sum</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

116. Populating Next Right Pointers in Each Node/116. Populating Next Right Pointers in Each Node.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_116._Populating_Next_Right_Pointers_in_Each_Node</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

118. Pascal's Triangle/118. Pascal's Triangle.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_118._Pascal_s_Triangle</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

121. Best Time to Buy and Sell Stock/121. Best Time to Buy and Sell Stock.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_121._Best_Time_to_Buy_and_Sell_Stock</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

136. Single Number/136. Single Number.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_136._Single_Number</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

14. Longest Common Prefix/14. Longest Common Prefix.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>_14._Longest_Common_Prefix</RootNamespace>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

14. Longest Common Prefix/Program.cs

@@ -0,0 +1,6 @@
+// See https://aka.ms/new-console-template for more information
+
+using _14._Longest_Common_Prefix;
+
+string[] strs = ["flower", "flow", "flight"];
+Console.WriteLine(new Solution().LongestCommonPrefix(strs));

14. Longest Common Prefix/Solution.cs

@@ -0,0 +1,32 @@
+using System.Text;
+
+namespace _14._Longest_Common_Prefix;
+
+public class Solution
+{
+    public string LongestCommonPrefix(string[] strs)
+    {
+        if (strs.Length == 1)
+            return strs[0];
+        StringBuilder sb = new StringBuilder(256);
+        int maxLen = strs.Select(s => s.Length).Min();
+        for (int i = 0; i < maxLen; i++)
+        {
+            char letter;
+            if ((letter = strs[0][i]) != strs[1][i])
+                break;
+            for (int j = 2; j < strs.Length; j++)
+            {
+                if (letter != strs[j][i])
+                {
+                    maxLen = -1;
+                    break;
+                }
+            }
+            if(maxLen != -1)
+                sb.Append(letter);
+        }
+
+        return sb.ToString();
+    }
+}

141. Linked List Cycle/141. Linked List Cycle.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_141._Linked_List_Cycle</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

142. Linked List Cycle II/142. Linked List Cycle II.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_142._Linked_List_Cycle_II</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

144. Binary Tree Preorder Traversal/144. Binary Tree Preorder Traversal.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_144._Binary_Tree_Preorder_Traversal</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

145. Binary Tree Postorder Traversal/145. Binary Tree Postorder Traversal.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_145._Binary_Tree_Postorder_Traversal</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

1480. Running Sum of 1d Array/1480. Running Sum of 1d Array.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_1480._Running_Sum_of_1d_Array</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

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>net8.0</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();
+    }
+}

150. Evaluate Reverse Polish Notation/150. Evaluate Reverse Polish Notation.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>_150._Evaluate_Reverse_Polish_Notation</RootNamespace>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

150. Evaluate Reverse Polish Notation/Program.cs

@@ -0,0 +1,11 @@
+// See https://aka.ms/new-console-template for more information
+
+using _150._Evaluate_Reverse_Polish_Notation;
+
+string[] arr = ["10", "1", "1", "2", "+", "+", "+"];
+var sol = new Solution();
+int n = 100000;
+while(n-- > 0)
+    Console.WriteLine(sol.EvalRPN(["10", "1", "1", "2", "+", "+", "+"]));
+
+    

150. Evaluate Reverse Polish Notation/Solution.cs

@@ -0,0 +1,31 @@
+namespace _150._Evaluate_Reverse_Polish_Notation;
+
+public class Solution
+{
+    public int EvalRPN(string[] tokens)
+    {
+        var stack = new Stack<int>(tokens.Length);
+        foreach (var token in tokens)
+        {
+            if (int.TryParse(token, out var number))
+                stack.Push(number);
+            else
+            {
+                int right = stack.Pop();
+                int left = stack.Pop();
+                char op = token[0];
+                stack.Push(Calc(op, left, right));
+            }
+        }
+        return stack.Pop();
+    }
+
+    private int Calc(char op, int left, int right) => op switch
+    {
+        '+' => left + right,
+        '-' => left - right,
+        '*' => left * right,
+        '/' => left / right,
+        _ => throw new ArgumentOutOfRangeException()
+    };
+}

167. Two Sum II - Input Array Is Sorted/167. Two Sum II - Input Array Is Sorted.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_167._Two_Sum_II___Input_Array_Is_Sorted</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

189. Rotate Array/189. Rotate Array.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_189._Rotate_Array</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

19. Remove Nth Node From End of List/19. Remove Nth Node From End of List.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_19._Remove_Nth_Node_From_End_of_List</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

190. Reverse Bits/190. Reverse Bits.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_190._Reverse_Bits</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

191. Number of 1 Bits/191. Number of 1 Bits.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_191._Number_of_1_Bits</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

198. House Robber/198. House Robber.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_198._House_Robber</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

2. Add Two Numbers/2. Add Two Numbers.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_2._Add_Two_Numbers</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

20. Valid Parentheses/20. Valid Parentheses.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_20._Valid_Parentheses</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

200. Number of Islands/200. Number of Islands.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_200._Number_of_Islands</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

203. Remove Linked List Elements/203. Remove Linked List Elements.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_203._Remove_Linked_List_Elements</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

205. Isomorphic Strings/205. Isomorphic Strings.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_205._Isomorphic_Strings</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

206. Reverse Linked List/206. Reverse Linked List.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_206._Reverse_Linked_List</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

21. Merge Two Sorted Lists/21. Merge Two Sorted Lists.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_21._Merge_Two_Sorted_Lists</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

217. Contains Duplicate/217. Contains Duplicate.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_217._Contains_Duplicate</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

225. Implement Stack using Queues/225. Implement Stack using Queues.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>_225._Implement_Stack_using_Queues</RootNamespace>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

225. Implement Stack using Queues/MyStack.cs

@@ -0,0 +1,50 @@
+namespace _225._Implement_Stack_using_Queues;
+
+public class MyStack
+{
+    private Queue<int> _queue = new Queue<int>(256);
+    private int? _lastNum = null;
+
+    public MyStack()
+    {
+    }
+
+    public void Push(int x)
+    {
+        if (_lastNum == null)
+        {
+            _lastNum = x;
+            return;
+        }
+
+        int count = _queue.Count;
+        _queue.Enqueue(_lastNum.Value);
+        _lastNum = x;
+        while (count-- > 0)
+            _queue.Enqueue(_queue.Dequeue());
+    }
+
+    public int Pop()
+    {
+        if (_lastNum != null)
+        {
+            int res = _lastNum.Value;
+            _lastNum = null;
+            return res;
+        }
+
+        return _queue.Dequeue();
+    }
+
+    public int Top()
+    {
+        if (_lastNum != null)
+            return _lastNum.Value;
+        return _queue.Peek();
+    }
+
+    public bool Empty()
+    {
+        return _lastNum == null && _queue.Count == 0;
+    }
+}

225. Implement Stack using Queues/Program.cs

@@ -0,0 +1,3 @@
+// See https://aka.ms/new-console-template for more information
+
+Console.WriteLine("Hello, World!");

226. Invert Binary Tree/226. Invert Binary Tree.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_226._Invert_Binary_Tree</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

231. Power of Two/231. Power of Two.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_231._Power_of_Two</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

232. Implement Queue using Stacks/232. Implement Queue using Stacks.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_232._Implement_Queue_using_Stacks</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

232. Implement Queue using Stacks/MyQueue.cs

@@ -2,18 +2,19 @@
 
 public class MyQueue
 {
-    private Stack<int> _sInput = new Stack<int>();
+    private Stack<int> _sInput = new Stack<int>(256);
-    private Stack<int> _sOutput = new Stack<int>();
+    private Stack<int> _sOutput = new Stack<int>(256);
 
     public void Push(int x)
     {
-        while (_sOutput.TryPop(out int res))
-            _sInput.Push(res);
         _sInput.Push(x);
     }
 
     public int Pop()
     {
+        if (_sOutput.Count > 0)
+            return _sOutput.Pop();
+        
         while (_sInput.TryPop(out int res))
             _sOutput.Push(res);
         return _sOutput.Pop();
@@ -21,6 +22,9 @@ public class MyQueue
 
     public int Peek()
     {
+        if (_sOutput.Count > 0)
+            return _sOutput.Peek();
+        
         while (_sInput.TryPop(out int res))
             _sOutput.Push(res);
         return _sOutput.Peek();
@@ -28,8 +32,6 @@ public class MyQueue
 
     public bool Empty()
     {
-        while (_sInput.TryPop(out int res))
+        return _sOutput.Count == 0 && _sInput.Count == 0;
-            _sOutput.Push(res);
-        return _sOutput.Count == 0;
     }
 }

232. Implement Queue using Stacks/Program.cs

@@ -4,6 +4,11 @@ internal class Program
 {
     static void Main(string[] args)
     {
-        Console.WriteLine("Hello, World!");
+        int x = 5;
+        MyQueue obj = new MyQueue();
+        obj.Push(x);
+        int param_2 = obj.Pop();
+        int param_3 = obj.Peek();
+        bool param_4 = obj.Empty();
     }
 }

235. Lowest Common Ancestor of a Binary Search Tree/235. Lowest Common Ancestor of a Binary Search Tree.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_235._Lowest_Common_Ancestor_of_a_Binary_Search_Tree</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

240. Search a 2D Matrix II/240. Search a 2D Matrix II.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_240._Search_a_2D_Matrix_II</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

242. Valid Anagram/242. Valid Anagram.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_242._Valid_Anagram</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

278. First Bad Version/278. First Bad Version.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_278._First_Bad_Version</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

283. Move Zeroes/283. Move Zeroes.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_283._Move_Zeroes</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

299. Bulls and Cows/299. Bulls and Cows.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_299._Bulls_and_Cows</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

3. Longest Substring Without Repeating Characters/3. Longest Substring Without Repeating Characters.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_3._Longest_Substring_Without_Repeating_Characters</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

344. Reverse String/344. Reverse String.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_344._Reverse_String</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

347. Top K Frequent Elements/347. Top K Frequent Elements.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>_347._Top_K_Frequent_Elements</RootNamespace>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

347. Top K Frequent Elements/Program.cs

@@ -0,0 +1,4 @@
+using _347._Top_K_Frequent_Elements;
+
+var sol = new Solution();
+Console.WriteLine(string.Join(", ", sol.TopKFrequent([1,1,1,2,2,3], 2)));

347. Top K Frequent Elements/Solution.cs

@@ -0,0 +1,13 @@
+namespace _347._Top_K_Frequent_Elements;
+
+public class Solution
+{
+    public int[] TopKFrequent(int[] nums, int k)
+    {
+        var dictionary = new Dictionary<int, int>();
+        foreach (var num in nums)
+            if (!dictionary.TryAdd(num, 1))
+                dictionary[num]++;
+        return dictionary.OrderByDescending(kp=>kp.Value).Take(k).Select(kp=>kp.Key).ToArray();
+    }
+}

35. Search Insert Position/35. Search Insert Position.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_35._Search_Insert_Position</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

350. Intersection of Two Arrays II/350. Intersection of Two Arrays II.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_350._Intersection_of_Two_Arrays_II</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

36. Valid Sudoku/36. Valid Sudoku.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_36._Valid_Sudoku</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

383. Ransom Note/383. Ransom Note.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_383._Ransom_Note</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

387. First Unique Character in a String/387. First Unique Character in a String.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_387._First_Unique_Character_in_a_String</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

392. Is Subsequence/392. Is Subsequence.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_392._Is_Subsequence</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

4. Median of Two Sorted Arrays/4. Median of Two Sorted Arrays.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_4._Median_of_Two_Sorted_Arrays</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

409. Longest Palindrome/409. Longest Palindrome.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_409._Longest_Palindrome</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

424. Longest Repeating Character Replacement/424. Longest Repeating Character Replacement.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_424._Longest_Repeating_Character_Replacement</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

438. Find All Anagrams in a String/438. Find All Anagrams in a String.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_438._Find_All_Anagrams_in_a_String</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

451. Sort Characters By Frequency/451. Sort Characters By Frequency.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>_451._Sort_Characters_By_Frequency</RootNamespace>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

451. Sort Characters By Frequency/Fast/FastSolution.cs

@@ -0,0 +1,26 @@
+using System.Text;
+
+namespace _451._Sort_Characters_By_Frequency.Fast;
+
+public class Solution
+{
+    private static int Comparer((char, int) el1, (char, int) el2)
+    {
+        return el2.Item2.CompareTo(el1.Item2);
+    }
+    
+    public string FrequencySort(string s)
+    {
+        var count = new (char, int)[128];
+        for (var ch = (char)0; ch < count.Length; ch++)
+            count[ch].Item1 = ch;
+        foreach (var c in s)
+            count[c].Item2++;
+        var sb = new StringBuilder();
+        Array.Sort(count, Comparer);
+        for (var ch = (char)0; ch < count.Length; ch++)
+            while (count[ch].Item2-- > 0)
+                sb.Append(count[ch].Item1);
+        return sb.ToString();
+    }
+}

451. Sort Characters By Frequency/Program.cs

@@ -0,0 +1,4 @@
+using _451._Sort_Characters_By_Frequency;
+
+var sol = new _451._Sort_Characters_By_Frequency.Fast.Solution();
+Console.WriteLine(sol.FrequencySort("gbngjaaaaaaaafsdgnjk;fdsnjkg;fds"));

451. Sort Characters By Frequency/Solution.cs

@@ -0,0 +1,16 @@
+namespace _451._Sort_Characters_By_Frequency;
+
+public class Solution
+{
+    public string FrequencySort(string s)
+    {
+        Dictionary<char, int> dictionary = [];
+        foreach (var c in s.Where(c => !dictionary.TryAdd(c, 1)))
+            dictionary[c]++;
+
+        var list = dictionary.ToList();
+        return String.Join("",
+            list.OrderByDescending(element => element.Value)
+                .Select(element => new string(element.Key, element.Value)));
+    }
+}

46. Permutations/46. Permutations.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_46._Permutations</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

509. Fibonacci Number/509. Fibonacci Number.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_509._Fibonacci_Number</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

53. Maximum Subarray/53. Maximum Subarray.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_53._Maximum_Subarray</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

542. 01 Matrix/542. 01 Matrix.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_542._01_Matrix</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

557. Reverse Words in a String III/557. Reverse Words in a String III.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_557._Reverse_Words_in_a_String_III</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

566. Reshape the Matrix/566. Reshape the Matrix.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_566._Reshape_the_Matrix</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

567. Permutation in String/567. Permutation in String.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_567._Permutation_in_String</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

589. N-ary Tree Preorder Traversal/589. N-ary Tree Preorder Traversal.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_589._N_ary_Tree_Preorder_Traversal</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

6. Zigzag Conversion/6. Zigzag Conversion.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_6._Zigzag_Conversion</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

617. Merge Two Binary Trees/617. Merge Two Binary Trees.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_617._Merge_Two_Binary_Trees</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

62. Unique Paths/62. Unique Paths.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_62._Unique_Paths</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

695. Max Area of Island/695. Max Area of Island.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_695._Max_Area_of_Island</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

70. Climbing Stairs/70. Climbing Stairs.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_70._Climbing_Stairs</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

700. Search in a Binary Search Tree/700. Search in a Binary Search Tree.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_700._Search_in_a_Binary_Search_Tree</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

701. Insert into a Binary Search Tree/701. Insert into a Binary Search Tree.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_701._Insert_into_a_Binary_Search_Tree</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

704. Binary Search/704. Binary Search.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_704._Binary_Search</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

724. Find Pivot Index/724. Find Pivot Index.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_724._Find_Pivot_Index</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

733. Flood Fill/733. Flood Fill.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_733._Flood_Fill</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

74. Search a 2D Matrix/74. Search a 2D Matrix.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_74._Search_a_2D_Matrix</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

746. Min Cost Climbing Stairs/746. Min Cost Climbing Stairs.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_746._Min_Cost_Climbing_Stairs</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

77. Combinations/77. Combinations.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_77._Combinations</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

784. Letter Case Permutation/784. Letter Case Permutation.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>_784._Letter_Case_Permutation</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

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>