题解 | #矩阵乘法#

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 a = in.nextInt();
        //         int b = in.nextInt();
        //         System.out.println(a + b);
        //     }
        int x = in.nextInt();
        int y = in.nextInt();
        int z = in.nextInt();
        int[][] A = new int[x][y];
        int[][] B = new int[y][z];
        for (int i = 0; i < x; i++) {
            for (int j = 0; j < y; j++) {
                A[i][j] = in.nextInt();
            }
        }
        for (int i = 0; i < y; i++) {
            for (int j = 0; j < z; j++) {
                B[i][j] = in.nextInt();
            }
        }
        int[][] C = new int[x][z];
        for (int i = 0; i < x; i++) {
            for (int j = 0; j < z; j++) {
                int temp = 0;
                for (int k = 0; k < y; k++) {
                    temp += A[i][k] * B[k][j] ;
                }
                C[i][j] = temp;
            }
        }
        for (int i = 0; i < x; i++) {
            for (int j = 0; j < z; j++) {
                System.out.print(C[i][j] + " ");
            }
            System.out.println();
        }
    }
}