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 in = new Scanner(System.in); int n = in.nextInt(); int k = 1; int[][] arr = new int[n][n]; int i = 0, i2 = 0, j = 0, j2 = 0, i3 = 0; for(i = 0;i< n;i++) { for (j = ...