package practice.people.apple;
import java.util.Scanner;
public class YangHui {
public static void main(String[] args) {
Scanner myscanner = new Scanner(System.in);
System.out.println("请输入杨辉三角层数");
int nums = myscanner.nextInt();
//为nums开辟空间
int[][] arr = new int[nums][];
//外层循环
for(int i = 0;i < arr.length; i++) {
//为每层循环开辟空间
arr[i]=new int[i+1];
//为第一个数和最后一个赋值为1
for(int j = 0;j < arr[i].length; j++) {
if(j == 0 || j == arr[i].length-1) {
arr[i][j] = 1;
}
else {
arr[i][j] = arr[i-1][j]+arr[i-1][j-1];
}
}
}
//利用循环输出数组
for(int i = 0;i < arr.length; i++) {
for(int j = 0;j < arr[i].length; j++) {
System.out.print(arr[i][j]+" ");
}
System.out.println();
}
}
}
