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 sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int[][] matrix1 = new int[a][b];
        int[][] matrix2 = new int[b][c];
        for (int i = 0; i < a; i++) {
            for (int j = 0; j < b; j++) {
                matrix1[i][j] = sc.nextInt();
            }
        }
        for (int i = 0; i < b; i++) {
            for (int j = 0; j < c; j++) {
                matrix2[i][j] = sc.nextInt();
            }
        }
        int[][] res = new int[a][c];
        for (int i = 0; i < a; i++) {
            for (int j = 0; j < c; j++) {
                int sum = 0;
                for (int k = 0; k < b; k++) {
                    sum += matrix1[i][k] * matrix2[k][j];
                }
                res[i][j] = sum;
            }
        }
        for (int i = 0; i < a; i++) {
            for (int j = 0; j < c; j++) {
                System.out.print(res[i][j] + " ");
            }
            System.out.println();
        }
    }
}