This is a

solution to

problem 25 on the

**hard interview questions** node. If you have not read the

question, the

following will make no

sense to you:

Cut each pill in half and divide them into two piles. Then, take another A pill from the bottle, cut it in half, and put each half in one of the piles. Now, each pile contains two halves from each type of pill, so you just take one of the piles (and the other the next day).