add a few more solutions

Level4/Level4.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../Common/Common.csproj" />
+  </ItemGroup>
+
+</Project>

Level4/Level4Solver.cs

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+namespace AoC24;
+
+using AoC24.Common;
+using AoCLevelInputProvider;
+using Parsing;
+using Parsing.Data;
+using Parsing.Schema;
+
+public class Level4Solver : FullTextLevelSolverBase
+{
+    public override int LevelNumber
+    {
+        get { return 4; }
+    }
+
+    protected override InputSchemaBuilder DefineInputSchema(InputSchemaBuilder schemaBuilder)
+    {
+        return schemaBuilder
+                    .Repeat()
+                        .Expect(InputType.Char)
+                    .EndRepetition();
+    }
+
+    public override string SolveFirstStar()
+    {
+        var data = this.GetData()
+                       .AsListRows<string>();
+
+        var searchSequence = new List<string> { "X", "M", "A", "S" };
+        var manipulator = DefaultTwoDimensionalManipulator.Create(data);
+        var searchResults = manipulator.FindInSet(searchSequence);
+
+        return searchResults.Count.ToString();
+    }
+
+    public override string SolveSecondStar()
+    {
+        var data = this.GetData()
+                       .AsListRows<string>();
+
+        var searchSequence = new List<string> { "M", "A", "S" };
+        var manipulator = DefaultTwoDimensionalManipulator.Create(data);
+        var searchResults = manipulator.FindInSet(searchSequence, Direction.NE | Direction.SE | Direction.NW | Direction.SW);
+
+        var indicesComparator = (IDataIndex<int> index1, IDataIndex<int> index2) =>
+        {
+            return index1.GetIndices()[0] == index2.GetIndices()[0] && index1.GetIndices()[1] == index2.GetIndices()[1];
+        };
+
+        var foundMatches = 0;
+        for(int i = 0; i < searchResults.Count; i++)
+        {
+            var secondPositionA = manipulator.Move(searchResults[i].DataIndex, searchResults[i].Direction);
+            for(int j = i+1; j < searchResults.Count; j++)
+            {
+                var secondPositionB = manipulator.Move(searchResults[j].DataIndex, searchResults[j].Direction);
+                if(indicesComparator(secondPositionA, secondPositionB))
+                {
+                    foundMatches++;
+                    break;
+                }
+            }
+        }
+
+        return foundMatches.ToString();
+    }
+}

Level4/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using AoC24;
+
+var levelSolver = new Level4Solver();
+var solution1 = levelSolver.SolveFirstStar();
+var solution2 = levelSolver.SolveSecondStar();
+
+if (!string.IsNullOrEmpty(solution1))
+{
+    Console.WriteLine("Solution for example 1 is: " + solution1);
+}
+else
+{
+    Console.WriteLine("Example 1 has not been solved yet!");
+}
+if (!string.IsNullOrEmpty(solution2))
+{
+    Console.WriteLine("Solution for example 2 is: " + solution2);
+}
+else
+{
+    Console.WriteLine("Example 2 has not been solved yet!");
+}