题解 | #矩阵幂# java循环

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);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int n = in.nextInt();
            int time = in.nextInt();
            int[][] matrix = new int[n][n];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < n; j++) {
                    matrix[i][j] = in.nextInt();
                }
            }
            int[][] pre = matrix;
            for (int t = 0; t < time-1; t++) {
                int[][] next=new int[n][n];
                for (int i = 0; i < n; i++) {
                    for (int j = 0; j < n; j++) {
                        for (int k = 0; k < n; k++) {
                            next[i][j] += pre[i][k] *matrix[k][j];
                        }
                    }
                }
                pre=next;
            }
            for(int i=0;i<n;i++){
                for(int j=0;j<n;j++){
                    System.out.print(pre[i][j]+" ");
                }
                System.out.println();
            }
        }
    }
}