找出字符串中所有对称的字符子串

written by Li

namespace ConsoleApplication3
{
    class Program
    {
        public static void findHuiWen(string s)
        {
            string tmp = null;
            for (int i = 0; i < s.Length; i++)
            {
                for (int j = s.Length - 1; j > i; j--)
                {
                    while (s[i] == s[j])
                    {
                        tmp = s.Substring(i, j+1-i);
                        if (IsHuiWen(tmp))
                        {
                            Console.WriteLine(tmp);
                            break;
                        }
                        else
                        {
                            break;
                        }
                    }
                }
            }
        }


        public static bool IsHuiWen(string a)
        {
            string sb = null;
            for (int i = 0; i < a.Length; i++)
            {
                sb += a[a.Length -1 - i];
            }
            if (sb == a)
            {
                return true;
            }
            else
            {
                return false;
            }
        }


        static void Main(string[] args)
        {
            string s = "abaabaccdefggfed";
            findHuiWen(s);
        }
    }
}

written by Wang

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            string testString = "abaabaccdefggfed";
            string subString;
            string revertString;
            string result = null;

            for (int i = 0; i < testString.Length; i++)
            {
                for (int j = 2; j < testString.Length - i; j++)
                {
                    subString = testString.Substring(i, j);
                    revertString = revert(subString);
                    if (subString == revertString)
                    {
                        result += subString;
                        result += ";";
                    }
                }
            }
            Console.WriteLine(result);
            Console.Read();
        }

        static string revert(string subString)
        {
            char[] revertString = subString.ToCharArray();

            if (revertString.Length > 0)
            {
                for (int i = 0; i < ((revertString.Length) / 2); i++)
                {
                    char temp = revertString[i];
                    revertString[i] = revertString[subString.Length - 1 - i];
                    revertString[subString.Length - 1 - i] = temp;
                }
            }
            string result = new string(revertString);
            return result;
        }
    }
}

C#,编译已通过