水杯测试： 有一个水杯配对游戏。共有 4 种不同颜色的水杯，每种颜色各有两个。将同色的两个水杯分别放在上下两层，因此 上下两层各有 4 个水杯。下层 4 个水杯按某个未知顺序排列，挑战者无法看到它们；上层水杯的颜色和位置则完 全可见。游戏开始后，挑战者可以反复进行以下操作： 1. 向裁判询问当前有多少个位置满足“上下两

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