贴一下第三题，虽然写得捞 import java.util.*; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int[][] matrax = new int[n][n]; for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) matrax[i][j] = in.nextInt(); } for (int i = 0; i < n; i++) for (int j = i; j < n; j++) { int temp = matrax[i][j]; matrax[i][j] = matrax[j][i]; matrax[j][i] = temp; } for (int i = 0; i < n; i++) for (int j = i; j < n; j++) System.out.println(matrax[i][j]); } }