utkaarsh - 2011-07-07 7:05 PM
Also an option, number of empty thermometers or completely filled ones
That doesn't work in general because in most cases you don't need to solve the puzzle completely to know #of empty/full thermos.
Secondly, global counting is something error-prone
(e.g. #of horizontal bridges in Hashi
). I think we should avoid answer keys like this.