题解 | #矩阵乘法#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextInt()) {
            int x = in.nextInt();
            int y = in.nextInt();
            int z = in.nextInt();
            int[][] arr1 = new int[x][y];
            int[][] arr2 = new int[y][z];
            for (int i = 0; i < x; i++) {
                for (int j = 0; j < y; j++) {
                    arr1[i][j] = in.nextInt();
                }
            }
            for (int i = 0; i < y; i++) {
                for (int j = 0; j < z; j++) {
                    arr2[i][j] = in.nextInt();
                }
            }

            int[][] ints = new int[x][z];
            for (int i = 0; i < x; i++) {
                for (int j = 0; j < z; j++) {
                    for (int k = 0; k < y; k++) {
                        ints[i][j] += arr1[i][k] * arr2[k][j];
                    }
                }
            }

            for (int i = 0; i < ints.length; i++) {
                for (int j = 0; j < ints[0].length; j++) {
                    System.out.print(ints[i][j] + " ");
                }
                System.out.println();
            }
        }
    }
}
刚开始没看懂题目的意思，百度了才知道规则，蛮好玩的，理解规则就是简单题