how to find counterfeit coin out of 8 coins
3 Suppose there are seven coins, all with the same weight, and a counterfeit coin that weights less than the others. How many weighings are necessary using a balance scale to determine which of the eight coins is the counterfeit one? Give an algorithm for finding this counterfeit coin.
两次称重就足够了 - 首先比较硬币1,2,3到4,5,6，然后你会有两到三个硬币进行第二次比较。
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