int main()
{
int n = 1e7;
printf("initializing v...\n");
std::vector<double> &v = init_vector(n);
double *a = &(v[0]);
clock_t t;
printf("done.\n");
t = clock();
printf("sum0: %f\n", sum0(a, n));
printf("time: %d\n", clock() - t);
t = clock();
printf("sum1: %f\n", sum1(v));
printf("time: %d\n", clock() - t);
t = clock();
printf("sum2: %f\n", sum2(v));
printf("time: %d\n", clock() - t);
t = clock();
printf("sum3: %f\n", sum3(v));
printf("time: %d\n", clock() - t);
t = clock();
printf("sum4: %f\n", sum4(v));
printf("time: %d\n", clock() - t);
return 0;
}
int main() {
int a[] = {1, 2, 3, 5, 8};
printf("%d\n", sum0(a)); // 错误
printf("%d\n", sum1(a, 5));
printf("%d\n", sum2(a, a+5));
printf("%d\n", sum3(a, a+5));
return 0;
}
