23. Merge k Sorted Lists

23. Merge k Sorted Lists/23. Merge k Sorted Lists.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <RootNamespace>_23._Merge_k_Sorted_Lists</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

23. Merge k Sorted Lists/ListNode.cs

@@ -0,0 +1,11 @@
+
+public class ListNode
+{
+    public int val;
+    public ListNode? next;
+    public ListNode(int val = 0, ListNode? next = null)
+    {
+        this.val = val;
+        this.next = next;
+    }
+}

23. Merge k Sorted Lists/Program.cs

@@ -0,0 +1,2 @@
+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

23. Merge k Sorted Lists/Solution.cs

@@ -0,0 +1,29 @@
+public class Solution
+{
+    public ListNode? MergeKLists(ListNode[] lists)
+    {
+        ListNode? head = null;
+        ListNode? tail = null;
+        var queue = new PriorityQueue<ListNode, int>();
+        foreach (var l in lists)
+            if (l != null)
+                queue.Enqueue(l, l.val);
+        while (queue.Count > 0)
+        {
+            var l = queue.Dequeue();
+            if (head == null || tail == null)
+            {
+                head = l;
+                tail = l;
+            }
+            else
+            {
+                tail.next = l;
+                tail = l;
+            }
+            if (l.next != null)
+                queue.Enqueue(l.next, l.next.val);
+        }
+        return head;
+    }
+}

Leetcode.sln

@@ -185,6 +185,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "3546. Equal Sum Grid Partit
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "18. 4Sum", "18. 4Sum\18. 4Sum.csproj", "{0AF9E85C-7CCC-4E82-80B6-39931EA17D52}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "23. Merge k Sorted Lists", "23. Merge k Sorted Lists\23. Merge k Sorted Lists.csproj", "{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -1287,6 +1289,18 @@ Global
 		{0AF9E85C-7CCC-4E82-80B6-39931EA17D52}.Release|x64.Build.0 = Release|Any CPU
 		{0AF9E85C-7CCC-4E82-80B6-39931EA17D52}.Release|x86.ActiveCfg = Release|Any CPU
 		{0AF9E85C-7CCC-4E82-80B6-39931EA17D52}.Release|x86.Build.0 = Release|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Debug|x64.Build.0 = Debug|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Debug|x86.Build.0 = Debug|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Release|x64.ActiveCfg = Release|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Release|x64.Build.0 = Release|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Release|x86.ActiveCfg = Release|Any CPU
+		{B586286C-CBA7-4AF0-A2B3-E488639B2E5C}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE