백준 C# 2444

String Builder 알아보러가기

C# - StringBuilder

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List 메소드 알아보러가기

C# - List (찾기, 추가, 제거, 정렬 메서드)

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using System;
using System.Collections.Generic;
using System.Text;

namespace baek2
{
    class Program
    {
        
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            int N = int.Parse(input);
            List<string> list = new List<string>();

            int count = N-1;

            for(int i = 0; i< N; i++)
            {
                StringBuilder myStringBuilder = new StringBuilder();
                for (int k =0; k<count; k++)
                {
                    myStringBuilder.Append(" ");
                }
                for (int j = 0; j < (i*2)+1; j++)
                {
                    myStringBuilder.Append("*");
                }
                list.Add(myStringBuilder.ToString());
                count--;
            }

            foreach(var i in list)
            {
                Console.WriteLine(i);
            }

            list.Reverse();

            for(int i = 1; i<list.Count; i++)
            {
                Console.WriteLine(list[i]);
            }

        }
    }
}