package com.homework.zw;
//此题没有太大难度，不再写注释
import java.util.Scanner;
public class work4
{
 public static void main(String[] args)
 {
   Scanner sc = new Scanner(System.in);
         System.out.println("请输入一个正整数n");
         int n = sc.nextInt();
        int[][] a = new int[n][n];      
        for(int i =0;i<=n-1;i++)
        {
         for(int j =0;j<=i;j++)
         {
          if(j==0||i==j)
          {
           a[i][j]=1;
           System.out.print(a[i][j]+"\t");
          }
          else
          {
           a[i][j]=a[i-1][j]+a[i-1][j-1];
           System.out.print(a[i][j]+"\t");
          }
         }
         System.out.println("");
        }
       
 }

}