23333/3

#include <iostream>
#include <ctime>
#include <cstdlib>


const int SIZE = 1024;


void matmul(float** A, float** B, float** C, int n) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            float sum = 0;
            for (int k = 0; k < n; k++) {
                sum += A[i][k] * B[k][j];
            }
            C[i][j] = sum;
        }
    }
}

int main() {
    
    float** A = new float* [SIZE];
    for (int i = 0; i < SIZE; i++) {
        A[i] = new float[SIZE];
    }

    float** B = new float* [SIZE];
    for (int i = 0; i < SIZE; i++) {
        B[i] = new float[SIZE];
    }

    float** C = new float* [SIZE];
    for (int i = 0; i < SIZE; i++) {
        C[i] = new float[SIZE];
    }


    for (int i = 0; i < SIZE; i++) {
        for (int j = 0; j < SIZE; j++) {
            A[i][j] = (float)(rand() % 100);
            B[i][j] = (float)(rand() % 100);
        }
    }

    clock_t start_time, end_time;

    start_time = clock();


    matmul(A, B, C, SIZE);


    end_time = clock();


    double elapsed_time = ((double)(end_time - start_time)) / CLOCKS_PER_SEC;
    std::cout << "基础矩阵乘法的运行时间：" << elapsed_time << " 秒" << std::endl;


    for (int i = 0; i < SIZE; i++) {
        delete[] A[i];
        delete[] B[i];
        delete[] C[i];
    }
    delete[] A;
    delete[] B;
    delete[] C;

    return 0;
}