import java.util.Scanner;

public class Test6 {

    public static void main(String[] args) {
        //创建键盘录入对象
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入杨辉三角行数:");
        int n = sc.nextInt();
        //定义一个二维数组存放行数和列数
        int[][] arr = new int[n][n];
        //第一列和最后一列都为1,固定
        for (int x = 0; x < n; x++) {
            arr[x][0] = 1;
            arr[x][x] = 1;
        }

        //第三行开始
        for (int x = 2; x < arr.length; x++) {
            //第二列开始
            for (int y = 1; y <= x - 1; y++) {//减去最后一列
                arr[x][y] = arr[x - 1][y - 1] + arr[x - 1][y];
            }
        }

        System.out.println("输出的杨辉三角形为：");
        for (int x = 0; x <=arr.length-1; x++) {
            for (int y = 0; y <= x; y++) {

                System.out.print(arr[x][y] + "\t");
            }
            System.out.println();
        }
    }
}