该函数在一个字符串中找到可能的最长的子字符串，

如题，输出可能有多个最长字符串。

C# codes as below,

class Program

{

static void Main(string[] args)

{

string[] str = GetMaxString("1223344555666555777788887777");

foreach (string s in str)

{

Console.WriteLine(s);

}

Console.ReadKey();

}

static string[] GetMaxString(string str)

{

if (str == string.Empty || str == null)

{

return null;

}

//Set the default value of the string number is 1

int stringNumber=1;

//Set the default value of the string length is 1

int stringLength = 1;

char[] allChars = new char[str.Length];

//Set the default value of the first element is str[0]

allChars[0] = str[0];

char currentChar=str[0];

int count = 0;

for (int i = 0; i < str.Length; i++)

{

if (str[i] == currentChar)

{

count++;

if (count == stringLength)

{

//Set a bool mark to judge if the char has existed in the array allChars

bool ifExist = false;

//Go on a cycle to judge if the char has existed in the array allChars

for (int j = 0; j < stringNumber; j++)

{

if (allChars[j] == str[i])

{

ifExist = true;

}

}

//If this char hasn't been included in the array allChars, add it to the array.

if (!ifExist)

{

//Reset the number of the output strings

stringNumber++;

allChars[stringNumber - 1] = str[i];

}

}

else if (count > stringLength)

{

//Reset the number, length and value for the output strings

stringLength++;

stringNumber = 1;

allChars[0] = str[i];

}

}

else

{

//Reset current char's value

currentChar = str[i];

//Reset the value of count

count = 0;

//Recycle

i--;

}

}

//Name a string array

string[] result = new string[stringNumber];

//Set the value of the array

for (int i = 0; i < stringNumber; i++)

{

result[i] = new string(allChars[i], stringLength);

}

return result;

}

}

output:

7777

8888