题解 | 杨辉三角

import java.util.Scanner;
import java.util.ArrayList;
// 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();
        ArrayList<Integer> list = new ArrayList<>();
        list.add(1);
        System.out.println(list.get(0));
        list.add(1);
        System.out.printf("%d %d",list.get(0),list.get(1));
        System.out.println();
        for(int i = 3; i <= n; i++){
            list.add(1);
            for(int j = i-2;j > 0; j--){
                list.set(j,list.get(j)+list.get(j-1));
            }
            for(int j = 0;j < i;j++){
                System.out.print(list.get(j) + " ");
            }
            System.out.println();

        }
        
    }
}