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＜参考＞
（こちらは引用文献あり）
URLﾘﾝｸ(en.wikipedia.org)
Hat puzzle
(抜粋)
Hat puzzles are logic problems that date back to as early as 1961. [1]
Contents [hide]
1 A competitive version
2 A cooperative version
3 Ebert's version and Hamming codes
4 References
5 Further reading
6 See also
（こちらは引用文献なしだが、解法が詳しい）
URLﾘﾝｸ(en.wikipedia.org)
Prisoners and hats puzzle
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Contents [hide]
1 The puzzle
1.1 The solution
2 Variants
2.1 Four-Hat Variant
2.1.1 The solution
2.2 Five-Hat Variant
2.2.1 The solution
2.3 Three-Hat Variant
2.4 Ten-Hat Variant
2.4.1 The solution
2.5 Ten-Hat Variant without Hearing
2.5.1 The solution
2.6 Countably Infinite-Hat Variant without Hearing
2.6.1 The solution
2.7 Countably Infinite Hat Problem with Hearing
2.7.1 The solution
3 See also