#include <stdio.h>
#include <ctime>
#include <stdlib.h>

#define M  1000
#define N  1021
#define Q  1000
//A(M*N),B(N*Q),C(M*Q)对于矩阵维度的说明
void matmul(float** A, float** B, float** C)
{
	for (int i = 0; i < M; ++i) 
	{	
		for (int j = 0; j < Q; ++j) 
		{
			C[i][j] = 0;
			for (int k = 0; k < N; ++k) 
			{	
				C[i][j] += A[i][k] * B[k][j];
			}
		}
	}
}
int main()
{
	srand(time(NULL));
	
    // 分配矩阵内存
    float** A = (float**)malloc(M * sizeof(float*));
    float** B = (float**)malloc(N * sizeof(float*));
    float** C = (float**)malloc(M * sizeof(float*));
    for (int i = 0; i < M; ++i) 
    {
        A[i] = (float*)malloc(N * sizeof(float));
        C[i] = (float*)malloc(Q * sizeof(float));
    }
    for (int i = 0; i < N; ++i) 
    {
        B[i] = (float*)malloc(Q * sizeof(float));
    }
    // 初始化矩阵数据
    for (int i = 0; i < M; i++) {
        for (int j = 0; j < N; j++) {
            A[i][j] = (float)(rand() % 100) / 100.0f;
        }
    }
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < Q; j++) {
            B[i][j] = (float)(rand() % 100) / 100.0f;
        }
    }
    
    clock_t start = clock();
    matmul(A, B, C);
    clock_t end = clock();

    // 计算并输出向量乘法的时间
    double multiply_time_spent = double(end - start) / CLOCKS_PER_SEC;
    printf("使用基础的向量乘法：\n当矩阵A的维度为%d*%d,矩阵B的维度为%d*%d时，初始向量乘法时间：%lf秒\n",M,N,N,Q,multiply_time_spent);

    // 释放动态分配的内存
    for (int i = 0; i < M; ++i) {
        free(A[i]);free(C[i]);
    }
    for (int i = 0; i < N ;++i) {
        free(B[i]);
    }
    free(A); free(B); free(C);

}