printf("Build time %f\n", end0 - start0);
printf("Compute time %f\n", end1 - start1);
printf("Total time %f\n", end1 - start0);
printf("Build time %f\n", end0 - start0);
printf("Compute time %f\n", end1 - start1);
printf("Total time %f\n", end1 - start0);