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Sunday, March 06, 2005
quiz of the day: politician
有N人(N>3),其中任意两人有且仅有一个共同的朋友. 证明在这N人中必然存在一人,他与其他人都是朋友,这个人被称为政治家. 注意:朋友是双向的。甲是乙的朋友,则乙也是甲的朋友.
posted by Gang Ji at
11:38 AM
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