学步园

输入一个连续的字符串，输出一个字符串数组，规则是相邻的字符如果相同，那么就认为是同一个子串。我的实现如下

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

//*------------------Ctrix Project-------------*//
namespace ConsoleApplication1
{
    /// <summary>
    /// main class
    /// </summary>
    class Program
    {
        /// <summary>
        /// main function
        /// Creator:Y
        /// Create Date:2014-11-26
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            Console.WriteLine("Please input string:");
            string inputString = Console.ReadLine();
            string[] array = GetSubStringArray(inputString);
            Console.WriteLine("Output string Array:");
            foreach (string s in array)
            {
                Console.WriteLine(s);
                
            }
            Console.Read();
        }

        /// <summary>
        /// input string and get the sub-string array
        /// </summary>
        /// <param name="s">input string</param>
        /// <returns>sub-string array</returns>
        public static string[] GetSubStringArray(string s)
        {
            string[] subStringArray;
            if (string.IsNullOrEmpty(s))
            {
                return null;
            }
            else if (s.Length == 1)
            {
                subStringArray = new string[1];
                subStringArray[0] = s;
                return subStringArray;
            }
            else
            {
                int j = 0;
                List<string> list = new List<string>();
                string temp=string.Empty;
                string flag = s.Substring(0,1);
                for (int i = 1; i < s.Length; i++)
                {
                    temp=s.Substring(i,1);
                    if (flag != temp)
                    {
                        list.Add(s.Substring(j,i-j));
                        j = i;
                        flag=s.Substring(j,1);
                    }
                }

                if (flag != list[list.Count - 1])
                {
                    list.Add(s.Substring(j));
                }

                return list.ToArray();
              }
        }
    }
}

例如输入“abbcddefffg”，期待的结果就是一个数组{a,bb,c,dd,e,fff,g}。