杭电 2032 ( 杨辉三角 ) java

import java.util.*;public class  Main {    public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        while (sc.hasNext()) {            int n = sc.nextInt();            int[][] arr = new int[31][31];            for (int i = 0; i < n; i++) {                arr[i][0] = 1;                arr[i][i] = 1;                for (int j = 1; j <= i - 1; j++) {                    arr[i][j] = arr[i - 1][j] + arr[i - 1][j - 1];                }            }            for (int i = 0; i < n; i++) {                for (int j = 0; j <= i; j++) {                    if (j == 0) {                        System.out.print(arr[i][j]);                    }else                    System.out.print(" "+arr[i][j]);                }                System.out.println();            }            System.out.println("");        }    }}