#include <stdio.h>
#include <stdlib.h>
#include <ctime>
#define 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 = (float**)malloc(SIZE * sizeof(float*));
    for (int i = 0; i < SIZE; i++) {
        A[i] = (float*)malloc(SIZE * sizeof(float));
    }
    float** B = (float**)malloc(SIZE * sizeof(float*));
    for (int i = 0; i < SIZE; i++) {
        B[i] = (float*)malloc(SIZE * sizeof(float));
    }
    float** C = (float**)malloc(SIZE * sizeof(float*));
    for (int i = 0; i < SIZE; i++) {
        C[i] = (float*)malloc(SIZE * sizeof(float));
    }
    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 = clock();
    matmul(A, B, C, SIZE);
    clock_t end_time = clock();
    double elapsed_time = (double)(end_time - start_time) / CLOCKS_PER_SEC;
    printf("time: %lf s\n", elapsed_time);
    for (int i = 0; i < SIZE; i++) {
        free(A[i]);}
    free(A);
    for (int i = 0; i < SIZE; i++) {
        free(B[i]);}
    free(B);
    for (int i = 0; i < SIZE; i++) {
        free(C[i]);}
    free(C);
    return 0;
}