Completed initial hussy dry run for two-sum.

samples/Hussy.Net.Playground/Leetcode/Easy/TwoSum/HussyDryRun.cs

@@ -0,0 +1,23 @@
+namespace Hussy.Net.Playground.Leetcode.Easy;
+
+/// <summary>
+/// Represents a solution and its tests for the leetcode two-sum problem.
+/// </summary>
+/// <see href="https://leetcode.com/problems/two-sum/description/"/>
+public sealed partial class TwoSum
+{
+    /// <summary>
+    /// A very mundane and direct approach to solving the problem to understand where Hussy may be lacking.
+    /// </summary>
+    /// <param name="numbers">The array of numbers to look through.</param>
+    /// <param name="target">
+    ///     The target number which the two numbers in <paramref name="numbers"/> must add up to.
+    /// </param>
+    /// <returns>
+    ///     The two indices of the numbers which add up to the <paramref name="target"/>.
+    /// </returns>
+    private static IEnumerable<int>? HussyDryRun(
+        int[] n,
+        int t) =>
+        n.Fe((x, y) => x.I != y.I && x.V + y.V == t,(x, y) => new[] { x.I, y.I });
+}

samples/Hussy.Net.Playground/Leetcode/Easy/TwoSum/Tests/Setup.cs

@@ -14,7 +14,8 @@ public sealed partial class TwoSum
         DryRun,
         GolfedDryRun,
         ComplexityRun,
-        GolfedComplexityRun
+        GolfedComplexityRun,
+        HussyDryRun
     ];
 
     /// <summary>