Added a sliding window extension for IEnumerable

AdventOfCode.Extensions/EnumerableExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Numerics;
 
 namespace AdventOfCode.Extensions;
 
@@ -144,6 +145,18 @@ public static class EnumerableExtensions
         }
     }
     
-    private static TValue[] GetCombination<TValue>(int[] innerIndices, TValue[] innerPool) => 
-        innerIndices.Select(i => innerPool[i]).ToArray();
+    private static TValue[] GetCombination<TValue>(int[] indices, TValue[] values) => 
+        indices.Select(i => values[i]).ToArray();
+
+    public static IEnumerable<TValue[]> SlidingWindow<TValue>(this IEnumerable<TValue> values, int count)
+    {
+        var queue = new Queue<TValue>(count);
+        foreach (var value in values)
+        {
+            queue.Enqueue(value);
+            if(queue.Count > count)
+                queue.Dequeue();
+            yield return queue.ToArray();
+        }
+    }
 }