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出几个烧脑的智力/算法题，顺便聊聊它们背后的数学
source link: https://www.v2ex.com/t/504875
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算法 - @mathzhaoliang - **问题之一**：有 12 枚外表一模一样的硬币，其中一枚是假币，其余都是真币。假币的重量与真币不同，但是更重还是更轻不知道。给你一个没有砝码和刻度的天平，最少称几次才能找出假币?**问题
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