杨辉三角

import java.util.Scanner;public class PaTri {   public static void main(String[] args){Scanner reader=new Scanner(System.in);int n=reader.nextInt();triangle(n); }public static void triangle(int n){   int a[][]=new int[n][];for(int i=0;i<n;i++){  a[i]=new int[i+1];for(int j=0;j<a[i].length;j++){if(j==0||i==j){a[i][j]=1;}else{a[i][j]=a[i-1][j]+a[i-1][j-1];}}}for(int i=0;i<n;i++){for(int j=0;j<a[i].length;j++)System.out.printf(a[i][j]+" ");System.out.println();}}}