using System;

using System.Collections.Generic;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var res = new Solution().FizzBuzz(15);

        foreach(var item in res)

        {

            Console.WriteLine(item);

        }

    }

}

​

​

public class Solution {

    public IList<string> FizzBuzz(int n) {

        var result = new List<string>();

​

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

        {

            var resString = new StringBuilder();

            if (i % 3 == 0)

            {

                resString.Append("Fizz");

            }

            if (i % 5 == 0)

            {

                resString.Append("Buzz");

            }

            if (resString.Length > 0)

            {

                result.Add(resString.ToString());

            }

            else

            {

                result.Add(i.ToString());

            }

        }

        return result;

    }

}