Solution to Problem 1

answeCr（答案）：

Prisoner C shouted the color of his own hat.

犯人C喊出了他自己帽子的颜色

Solution：

If B and C were the same color, D would be able to deduce his color. Thus, when C doesn’t hear D shout his color, he knows he must be the opposite color as B.

解法：

如果B和C戴着同一种颜色的帽子，那么D就可以推导出自己帽子的颜色。C没有听见D喊，这就代表C戴着和B相反颜色的帽子。