Add day 5

AdventOfCode2024.sln

@@ -11,6 +11,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day3", "Day3\Day3.csproj",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day4", "Day4\Day4.csproj", "{739F3568-EE18-464B-8A60-281606EC2A31}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Day5", "Day5\Day5.csproj", "{F6C4FEFC-795A-45A5-A227-3DCA06749BAD}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -33,6 +35,10 @@ Global
 		{739F3568-EE18-464B-8A60-281606EC2A31}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{739F3568-EE18-464B-8A60-281606EC2A31}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{739F3568-EE18-464B-8A60-281606EC2A31}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F6C4FEFC-795A-45A5-A227-3DCA06749BAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F6C4FEFC-795A-45A5-A227-3DCA06749BAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F6C4FEFC-795A-45A5-A227-3DCA06749BAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F6C4FEFC-795A-45A5-A227-3DCA06749BAD}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Day5/Day5.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <None Update="input.txt">
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+    </ItemGroup>
+
+</Project>

Day5/Program.cs

@@ -0,0 +1,86 @@
+var lines = File.ReadAllLines("input.txt");
+
+var pageOrderingRules = new List<(int, int)>();
+var pageNumbersUpdates = new List<List<int>>();
+
+var separatorIndex = lines.ToList().IndexOf(string.Empty);
+for (var i = 0; i < separatorIndex; i++)
+{
+    var parts = lines[i].Split('|');
+    pageOrderingRules.Add((int.Parse(parts[0]), int.Parse(parts[1])));
+}
+
+for (var i = separatorIndex + 1; i < lines.Length; i++)
+{
+    var currentList = lines[i].Split(',')
+        .Select(int.Parse)
+        .ToList();
+    pageNumbersUpdates.Add(currentList);
+}
+
+var part1 = 0;
+var part2 = 0;
+
+foreach (var pageNumberUpdate in pageNumbersUpdates)
+{
+    var isInRightOder = true;
+
+    for (var i = 0; i < pageNumberUpdate.Count; i++)
+    {
+        var rules = pageOrderingRules
+            .Where(rule => rule.Item1 == pageNumberUpdate[i])
+            .ToList();
+
+        if (!IsPageInRightOrder(i, rules, pageNumberUpdate))
+        {
+            isInRightOder = false;
+            break;
+        }
+    }
+
+    if (isInRightOder)
+    {
+        part1 += pageNumberUpdate[pageNumberUpdate.Count / 2];
+    }
+    else
+    {
+        var orderedPages = OrderPages(pageNumberUpdate, pageOrderingRules);
+        part2 += orderedPages[orderedPages.Count / 2];
+    }
+}
+
+Console.WriteLine($"Part1: {part1}\nPart2: {part2}");
+
+List<int> OrderPages( List<int> pageNumberUpdate, List<(int, int)> rules)
+{
+    var orderedPages = new List<int>(pageNumberUpdate);
+    bool changesMade;
+    
+    do 
+    {
+        changesMade = false;
+        
+        foreach (var rule in rules)
+        {
+            if (!orderedPages.Contains(rule.Item1) || !orderedPages.Contains(rule.Item2)) continue;
+            
+            var index1 = orderedPages.IndexOf(rule.Item1);
+            var index2 = orderedPages.IndexOf(rule.Item2);
+
+            if (index1 <= index2) continue;
+                
+            orderedPages.RemoveAt(index1);
+            orderedPages.Insert(index2, rule.Item1);
+            changesMade = true;
+            break;
+        }
+    } 
+    while (changesMade);
+
+    return orderedPages;
+}
+
+bool IsPageInRightOrder(int pageIndex, List<(int, int)> rules, List<int> pageNumberUpdate)
+{
+    return rules.Select(rule => pageNumberUpdate.IndexOf(rule.Item2)).Where(indexOfRuleSecondPart => indexOfRuleSecondPart != -1).All(indexOfRuleSecondPart => pageIndex < indexOfRuleSecondPart);
+}