（自用）杨辉三角 java

import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        int n,i,j;
        Scanner sc=new Scanner(System.in);
        n=sc.nextInt();
        int[][] arr=new int[n][n];
        for(i=0;i<n;i++)
        {
                for(j=0;j<i+1;j++) {
                    if(j==0||j==i) arr[i][j]=1;
                    else {
                        arr[i][j]=arr[i-1][j-1]+arr[i-1][j];
                    }
                    System.out.print(arr[i][j]+" ");
                }
                System.out.println();
        }
    }

}