private static int isInList(List<Restaurant> list, Restaurant r)
{
if (list.Count == 0)
return -1;
for (int i = 0; i < list.Count; i++)
{
if (r.isMatch(list[i]))
return i;
else if (isInList(list[i].matchingRestaurants, r) > -1)
return i;
}
return -1;
}