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 sc = new Scanner(System.in);
       int n = sc.nextInt();
       int [][]arr = new int [n][n];
       for(int i = 0;i<n;i++){
        for(int j = 0;j<=i;j++){
            if(j == 0 || j == i){
               arr[i][j] = 1;
            }else{
                arr[i][j] = arr[i-1][j-1]+arr[i-1][j];
            }
        }
       }

       for(int i = 0;i<n;i++){
        for(int j = 0;j<=i;j++){
            System.out.printf("%5d",arr[i][j]);
        }
        System.out.println();
       }
    }
}