#include <sys/time.h>

static long long getnow ()
{
	struct timeval tv;
	gettimeofday (&tv,NULL);
	return tv.tv_sec *(long long)1000000 + tv.tv_usec;
}

static void showtime (std::string_view title, long long t1, long long t2)
{
	long long diff = t2 - t1;
	std::cerr << title << " ";
	fprintf (stderr,"%Ld.%06Ld\n",diff/1000000,diff%1000000);
}