为什么输出的杨辉三角越界

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 杨辉三角
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.Write("请输入杨辉三角的n值：");
            int n=Console.Read();
            int i, j;
            int[][] arr =new int[n+1][];
            for ( i = 0; i <= n; i++) 
            {
                arr[i] = new int[i+1];
                arr[i][0] = 1;
                for(j=1;j<i;j++)
                {
                    arr[i][j] =arr[i-1][j-1]+arr[i-1][j] ;
                }
                arr[i][i] = 1;
            }
            for(i=0;i<=n;i++)
            {
                Console.Write("".PadLeft(n-i-1));
                for (j=0;j<=i;j++) 
                {
                    Console.Write(arr[i][j]+" ");
                }
                Console.WriteLine();
            }
        }
    }
}

Answer 1

for ( i = 0; i <= n; i++)
->
for ( i = 0; i < n; i++)
注意要改 2 处！