There are 10 sets of 10 computer scientists. 9 sets of them are weight exactly the same, and you already know how much weight they should be. However, in the last set of computer scientests, all of them are 1 kg off (you have no idea they are either all 1 kg ligher or all 1 kg heavier), making the entire set of computer scientists 10 kg lighter or heavier than the other sets.

There’s an extremely accurate digital scale that you are allowed to use only once. The scale won’t be broken no matter how many computer scientists is on it. Question: how do you determine which set of 10 computer scientists is the fault one?

Difficulty Level: MEDIUM.

Please PM me your answer, or come to B235 directly. There’s a present for the first solve the puzzle.