从1KW条数据中筛选出1W条最大的数

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3
{
    class Program
    {
        static LinkedList<int> sortArrayLink = new LinkedList<int>();
        static void Main(string[] args)
        {
            //算法测试 在1KW条数据中取得最大的1W条
            //生成数据
            int[] randomInt = getRandomInt(10000000);
            int[] sortArray = randomInt.Take(10000).ToArray();
            randomInt = randomInt.Skip(10000).ToArray();
            sortArray = sortArray.OrderByDescending(u=>u).ToArray();
         
         var item=   sortArrayLink.AddFirst(sortArray[0]);
            for (int i = 1; i < sortArray.Length; i++)
                //生成链表
                sortArrayLink.AddAfter(item,sortArray[i]);
            //开始排序
            Stopwatch watch = new Stopwatch();
            watch.Start();
            int rpCount = 0;
           
            foreach (var num in randomInt)
            {
                rpCount++;
                Insert(num);
                }
            watch.Stop();
            Console.WriteLine(watch.Elapsed);
            //foreach (var num in sortArrayLink)
            //{
            //    Console.WriteLine(num);
            //}
            Console.ReadLine();



        }
        /// <summary>
        /// 获取指定长度的随机数据
        /// </summary>
        /// <param name="length"></param>
        /// <returns></returns>
        static int[] getRandomInt(int length) {
            //开始循环获取数据
            int[] randomInt = new int[length];
            for (int i = 0; i < length; i++)
            {
                Random r = new Random(i);
                randomInt[i] = r.Next(length);
                
            }
            return randomInt;
        }
        /// <summary>
        /// 尝试插入到排序数组
        /// </summary>
        /// <param name="sortArray">已经排序好的数组</param>
        /// <param name="insertNum">需要插入的数据</param>
        static void Insert(int insertNum) {
            var item = sortArrayLink.Last;

            if (insertNum < item.Value) return;
            var first = sortArrayLink.First;
            if (insertNum > first.Value)
            {
                sortArrayLink.AddBefore(first, insertNum);
                sortArrayLink.RemoveLast();//移除最后一个
                return;
            }
            if (insertNum == first.Value)
            {
                sortArrayLink.AddAfter(first, insertNum);
                sortArrayLink.RemoveLast();//移除最后一个
                return;

            }
            while (item.Next!= null)
            {

                if (item.Value < insertNum)
                {
                    item = item.Next;
                    continue;
                }
                sortArrayLink.AddAfter(item, insertNum);
                sortArrayLink.RemoveLast();//移除最后一个
                return;
            }
           

        }
    }
}

　　i5下运行

　　不计算生成数据时间 耗时0.27S 内存占用227MB