题解 | #矩阵乘法#

import java.io.*;

// 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) {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            int x = Integer.valueOf(br.readLine());
            int y = Integer.valueOf(br.readLine());
            int z = Integer.valueOf(br.readLine());
            int[][] m = new int[x][y];
            int[][] n = new int[y][z];
            for (int i = 0; i < x; i++) {
                String[] s = br.readLine().split(" ");
                for (int j = 0; j < y; j++) {
                    m[i][j] = Integer.valueOf(s[j]);
                }
            }
            for (int i = 0; i < y; i++) {
                String[] s = br.readLine().split(" ");
                for (int j = 0; j < z; j++) {
                    n[i][j] = Integer.valueOf(s[j]);
                }
            }
            int[][] ans = 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++) {
                        ans[i][j] += m[i][k] * n[k][j];
                    }
                }
            }
            for (int[] an : ans) {
                for (int i : an) {
                    System.out.print(i + " ");
                }
                System.out.println();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}