2024 ccfcsp认证打卡 2023 05 2 矩阵运算

屠苏之易，百里之峰2024-04-01 20:10
java 复制代码
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int N = 10010, D = 30;
        long[][] tmp = new long[D][D];  // 用于存储 K 的转置 * V 的结果
        long[][] ans = new long[N][D];  // 存储最终结果
        int n, d;  // n 表示矩阵的行数，d 表示矩阵的列数
        int[][] Q = new int[N][D];  // 输入矩阵 Q
        int[][] K = new int[N][D];  // 输入矩阵 K
        int[][] V = new int[N][D];  // 输入矩阵 V
        int[] W = new int[N];       // 输入数组 W

        n = input.nextInt();  // 输入矩阵行数
        d = input.nextInt();  // 输入矩阵列数
        
        // 输入矩阵 Q
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= d; j++)
                Q[i][j] = input.nextInt();
        
        // 输入矩阵 K
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= d; j++)
                K[i][j] = input.nextInt();
        
        // 输入矩阵 V
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= d; j++)
                V[i][j] = input.nextInt();
        
        // 输入数组 W
        for (int i = 1; i <= n; i++)
            W[i] = input.nextInt();

        // 计算 K 的转置 * V = tmp
        for (int i = 1; i <= d; i++)
            for (int j = 1; j <= d; j++)
                for (int k = 1; k <= n; k++)
                    tmp[i][j] += (long) K[k][i] * V[k][j];

        // 计算 Q * tmp = ans
        for (int i = 1; i <= n; i++)
            for (int j = 1; j <= d; j++) {
                for (int k = 1; k <= d; k++)
                    ans[i][j] += (long) Q[i][k] * tmp[k][j];
                ans[i][j] *= (long) W[i];
            }

        // 输出结果
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= d; j++)
                System.out.print(ans[i][j] + " ");
            System.out.println();
        }
    }
}