Pyramid Sort

gistfile1.cs

using System.IO;
using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        int[] elements = { 1, 8, 9, 13, 2, 7 };
        List<int> elems = elements.OrderBy(x => x).Reverse().ToList();
        
        List<int> pyramid = new List<int>();
        
        bool start = false;
        foreach(int e in elems)
        {
            if (start)
                pyramid.Add(e);
            else
                pyramid.Insert(0, e);
            
            start = !start;
        }
        
        foreach(int p in pyramid)
        {
            Console.WriteLine(p);
        }
    }
}