题解 | 杨辉三角

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[][] a = new int[n][n];
        for(int i = 0;i<n;i++){
            a[i][0] = 1;
            a[i][i] = 1;
        }
        for(int i = 2;i<n;i++){
            for(int j = 1;j<i;j++){
                a[i][j] = a[i-1][j]+a[i-1][j-1];
            }
        }
        for(int i = 0;i<n;i++){
            for(int j = 0;j<=i;j++){
                System.out.print(a[i][j]+" ");
            }
            System.out.printf("%n");
        }
    }
}