杭電 2032 ( 楊輝三角 ) 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("");
        }
    }
}