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);
        int matrix1Line = in.nextInt();
        int matrix1Col = in.nextInt();
        int matrix2Line = matrix1Col;
        int matrix2Col = in.nextInt();
        int[][] matrix1 = new int[matrix1Line][matrix1Col];
        int[][] matrix2 = new int[matrix2Line][matrix2Col];
        for (int i = 0; i < matrix1Line; i++) {
            for (int j = 0; j < matrix1Col; j++) {
                matrix1[i][j] = in.nextInt();
            }
            in.nextLine();
        }
        for (int i = 0; i < matrix2Line; i++) {
            for (int j = 0; j < matrix2Col; j++) {
                matrix2[i][j] = in.nextInt();
            }
            in.nextLine();
        }
        for (int i = 0; i < matrix1Line; i++) {
            for (int j = 0; j < matrix2Col; j++) {
                int value = 0;
                for (int m = 0; m < matrix1Col; m++) {
                    value += matrix1[i][m] * matrix2[m][j];
                }
                System.out.printf("%d ", value);
            }
            System.out.println();
        }
    }
}