作者Zyca (swun mitru valy)
标题[转录]◇ IMO 竞赛第二题
时间Wed Jan 5 20:25:15 2000
In a competition,there are a contestants and b judges,where b≧3 is
an odd interger. Each judge rates each contestant either "pass" or "fail".
Suppose k is a number such that,for any two judges,their ratings coincide
for at most k contestants.Prove that
k b-1
---≧ -----
a 2b
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