b***k
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tira (Tira) 于 (Fri Feb 15 20:45:53 2008) 提到:
有三个人，每人手里有一个密码数字。大家互相之间都不愿告诉
其他人他手里数字的真实值，问如何通过相互交谈推断出这3个数
字的总和。(DE Shaw brainteaser)
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orion (M42) 于 (Fri Feb 15 21:03:53 2008) 提到:
A picks up a random number, whispers to B.
B adds his own number, whispers to C.
C adds his own number, whispers to A.
A subtracts his random number, adds his own number, and announce it.
Mission completed!
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