This week’s lovely puzzle was brought to my attention by one of our readers, Nicolas Audet. Nicolas says it was used as a brain teaser for a finance job interview. I have to hand it to Wall Street on this one—it’s a delightful little puzzle. Thanks for sharing, Nicolas! This is a great opportunity to remind you that if you know a cool puzzle, original or otherwise, send it my way and it may get featured here. Not sure if your puzzle is appropriate for this series? Try me and I’ll let you know.
Each zombie has two possible states: in the group or not in the group, so each additional zombie doubles the number of possible groups we can make. The solution as written works. But if you want a slick systematic way for how to actually assign a unique group of zombies to each barrel, you can use binary numbers. Number the barrels from 0 to 999 and then convert each barrel number into binary.
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