蓝桥杯 基础练习 杨辉三角形 JAVA

import java.util.Scanner;class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();int a[][] = new int[n][n];for (int i = 0; i < a.length; i++) {for (int j = 0; j <= i; j++) {if (i == 0 || j == 0) {a[i][j] = 1;} else if (i == j) {a[i][j] = 1;} else {a[i][j] = a[i - 1][j] + a[i - 1][j - 1];}}}for (int i = 0; i < a.length; i++) {for (int j = 0; j <= i; j++) {System.out.print(a[i][j] + " ");}System.out.println();}}}