using System;

public class Program

{

    public static void Main()

    {

        for(int n=1; n<5; n++)

        {

            Console.WriteLine("Answer: " + countandSay(n));

        }

​

    }

    // Returns n'th term in look-and-say sequence 

private static string countandSay(int n) 

{ 

    // Base cases 

    if (n == 1)      return "1"; 

    if (n == 2)      return "11"; 

    // Find n'th term by generating all terms from 3 to 

    // n-1.  Every term is generated using previous term 

    string str = "11"; // Initialize previous term 

    for (int i = 3; i<=n; i++) 

    { 

        // In below for loop, previous character 

        // is processed in current iteration. That 

        // is why a dummy character is added to make 

        // sure that loop runs one extra iteration. 

        str += '$'; 

        int len = str.Length; 

        int cnt = 1; // Initialize count of matching chars 

        string  tmp = ""; // Initialize i'th term in series 

        // Process previous term to find the next term 

        for (int j = 1; j < len; j++) 

        { 

            // If current character does't match 

            if (str[j] != str[j-1]) 

            { 

                // Append count of str[j-1] to temp 

                tmp += cnt + '0'; 

                // Append str[j-1] 

                tmp += str[j-1]; 

                // Reset count 

                cnt = 1; 

            } 

            //  If matches, then increment count of matching 

            // characters 

            else cnt++; 

        } 

        // Update str 

        str = tmp; 

    } 

    return str; 

} 

​

​

​

}