Twelve Computer Scientists Challenge

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There are 12 computer scientists, 11 of them have the exact same weight. However, the last one is either heavier or lighter than others (but you don’t know which is the case).

Your job is to identify the one with different weight. The only tool is a seesaw, which unfortunately can be used only 3 times.

Please find out how to finish your job in these conditions. How do you use the seesaw?

Hints out at here

If you solve the puzzle, please come get your present at B235.