排序五：归并排序

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

namespace Sort
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> list = new List<int>();
            Random rd = new Random();
            for (int i = 0; i < 10; i++)
            {
                list.Add(rd.Next(100));
            }
            List<int> successList = Sort(list);
            foreach (int i in successList)
            {
                Console.WriteLine(i);
            }
        }

        /// <summary>
        /// 进行递归二分排序
        /// </summary>
        static List<int> Sort(List<int> list)
        {
            //递归出口
            if (list.Count <= 1)
            {
                return list;
            }

            int mid = list.Count / 2;
            List<int> left = new List<int>();
            List<int> right = new List<int>();
            for (int i = 0; i < mid; i++)
            {
                left.Add(list[i]);
            }
            for (int i = mid; i < list.Count; i++)
            {
                right.Add(list[i]);
            }
            left = Sort(left);
            right = Sort(right);
            return Merge(left, right);
        }

        /// <summary>
        /// 合并已经排好序的List
        /// </summary>
        static List<int> Merge(List<int> left, List<int> right)
        {
            List<int> temp = new List<int>();
            while (left.Count > 0 && right.Count > 0)
            {
                if (left[0] > right[0])
                {
                    temp.Add(right[0]);
                    right.RemoveAt(0);
                }
                else
                {
                    temp.Add(left[0]);
                    left.RemoveAt(0);
                }
            }
            if (left.Count > 0)
            {
                foreach (int i in left)
                {
                    temp.Add(i);
                }
            }
            if (right.Count > 0)
            {
                foreach (int i in right)
                {
                    temp.Add(i);
                }
            }
            return temp;
        }
    }
}