#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>

long long getus(void)
{
	struct timeval tv;

	gettimeofday(&tv, NULL);
	return ((long long)tv.tv_sec * 1000000 + tv.tv_usec);
}