java使用一维数组输出杨辉三角

import java.util.Scanner;public class Promble19 {public static int[] printYangHui(int col){int space=(col+1)*col/2;int[] a=new int[space+1];a[0]=space;a[1]=1;a[2]=1;a[3]=1;int count=2;for(int i=3;i<=col;i++){count++;int flag=i*(i-1)/2;for(int j=1;j<=count;j++){if(j==1||j==count){a[flag+j]=1;}else{a[flag+j]=a[(i-2)*(i-1)/2+(j-1)] + a[(i-2)*(i-1)/2+j];}}}return a;}public static void main(String[] args) {Scanner reader=new Scanner(System.in);int col=reader.nextInt();int[] a=printYangHui(col);int f=1;int count=0;int cp=col;for(int i=1;i<=col;i++){for(int k=1;k<=cp;k++){System.out.print(" ");}cp--;count++;int flag=(i)*(i-1)/2;for(int j=1;j<=count;j++){System.out.print(" "+a[flag+j]);}System.out.println();}}}