binary-trees C# .NET Core #6 program

// The Computer Language Benchmarks Game
// https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
//
// contributed by Marek Safar
// concurrency added by Peperud
// fixed long-lived tree by Anthony Lloyd
// ported from F# version by Anthony Lloyd

using System;
using System.Threading.Tasks;

class BinaryTrees
{
    struct TreeNode
    {
        class Next { public TreeNode left, right; }
        readonly Next next;

        TreeNode(TreeNode left, TreeNode right) =>
            next = new Next { left = left, right = right };

        internal static TreeNode Create(int d)
        {
            return d == 1 ? new TreeNode(new TreeNode(), new TreeNode())
                          : new TreeNode(Create(d - 1), Create(d - 1));
        }

        internal int Check()
        {
            int c = 1;
            var current = next;
            while (current != null)
            {
                c += current.right.Check() + 1;
                current = current.left.next;
            }
            return c;
        }
    }

    const int MinDepth = 4;
    const int NoTasks = 4;

    public static void Main(string[] args)
    {
        int maxDepth = args.Length == 0 ? 10
            : Math.Max(MinDepth + 2, int.Parse(args[0]));

        var stretchTreeCheck = Task.Run(() =>
        {
            int stretchDepth = maxDepth + 1;
            return "stretch tree of depth " + stretchDepth + "\t check: " +
                        TreeNode.Create(stretchDepth).Check();
        });

        var longLivedTree = TreeNode.Create(maxDepth);
        var longLivedText = Task.Run(() =>
        {
            return "long lived tree of depth " + maxDepth +
                        "\t check: " + longLivedTree.Check();
        });

        var results = new string[(maxDepth - MinDepth) / 2 + 1];

        for (int i = 0; i < results.Length; i++)
        {
            int depth = i * 2 + MinDepth;
            int n = (1 << maxDepth - depth + MinDepth) / NoTasks;
            var tasks = new Task<int>[NoTasks];
            for (int t = 0; t < tasks.Length; t++)
            {
                tasks[t] = Task.Run(() =>
                {
                    var check = 0;
                    for (int i = n; i > 0; i--)
                        check += TreeNode.Create(depth).Check();
                    return check;
                });
            }
            var check = tasks[0].Result;
            for (int t = 1; t < tasks.Length; t++)
                check += tasks[t].Result;
            results[i] = (n * NoTasks) + "\t trees of depth " + depth +
                            "\t check: " + check;
        }

        Console.WriteLine(stretchTreeCheck.Result);

        for (int i = 0; i < results.Length; i++)
            Console.WriteLine(results[i]);

        Console.WriteLine(longLivedText.Result);
    }
}
    

NOTES:
64-bit Ubuntu quad core
.NET Core SDK   3.1.201
Host Version: 3.1.3; Commit: 4a9f85e9f8
<ServerGarbageCollection>true
<ConcurrentGarbageCollection>true


Thu, 07 May 2020 20:46:05 GMT

MAKE:
cp binarytrees.csharpcore-6.csharpcore Program.cs
cp Include/csharpcore/tmp.csproj .
mkdir obj
cp Include/csharpcore/project.assets.json ./obj
/usr/bin/dotnet build -c Release --no-restore
Microsoft (R) Build Engine version 16.5.0+d4cbfca49 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  tmp -> /home/dunham/benchmarksgame_quadcore/binarytrees/tmp/bin/Release/netcoreapp3.1/tmp.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:04.85

6.94s to complete and log all make actions

COMMAND LINE:
/usr/bin/dotnet ./bin/Release/netcoreapp3.1/tmp.dll 21

PROGRAM OUTPUT:
stretch tree of depth 22	 check: 8388607
2097152	 trees of depth 4	 check: 65011712
524288	 trees of depth 6	 check: 66584576
131072	 trees of depth 8	 check: 66977792
32768	 trees of depth 10	 check: 67076096
8192	 trees of depth 12	 check: 67100672
2048	 trees of depth 14	 check: 67106816
512	 trees of depth 16	 check: 67108352
128	 trees of depth 18	 check: 67108736
32	 trees of depth 20	 check: 67108832
long lived tree of depth 21	 check: 4194303