Created
February 5, 2012 06:24
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alloy exercise for a puzzle
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enum Cap { Black, White } | |
abstract sig Children { | |
cap: one Cap, | |
visible: set Children | |
} | |
one sig A extends Children {} { | |
visible = none | |
cap = Black | |
} | |
one sig B extends Children {} { | |
visible = none | |
cap = White | |
} | |
one sig C extends Children {} { | |
visible = B | |
cap = Black | |
} | |
one sig D extends Children {} { | |
visible = B + C | |
cap = White | |
} | |
fact { | |
#cap.Black = 2 and #cap.White = 2 | |
} | |
pred CanAnswer(c: Children) { | |
#(c.visible :>cap.Black) = 2 or #(c.visible :> cap.White) = 2 | |
} | |
run { | |
no c: Children | CanAnswer [c] | |
} |
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// 帽子の色 | |
enum Cap { Black, White } | |
abstract sig Children { | |
cap: one Cap, // かぶっている帽子の色 | |
visible: set Children // 見える他の子供 | |
} | |
// A, B, C, D の条件 | |
one sig A extends Children {} { | |
visible = none | |
cap = Black | |
} | |
one sig B extends Children {} { | |
visible = none | |
cap = White | |
} | |
one sig C extends Children {} { | |
visible = B | |
cap = Black | |
} | |
one sig D extends Children {} { | |
visible = B + C | |
cap = White | |
} | |
fact { | |
#cap.Black = 2 and #cap.White = 2 | |
} | |
// c の帽子の色の合計のいずれかが num なら真 | |
pred CountCapNumber (c: Children, num: Int) { | |
#c :> cap.Black = num or #c :> cap.White = num | |
} | |
// 前をみた瞬間に答えられるか | |
pred すぐに回答できる (c: Children) { | |
CountCapNumber [c.visible, 2] | |
} | |
// 他の子の回答(ができないこと)を待って答えられるか | |
pred 少しして回答できる (c: Children) { | |
// すぐに回答する子はいない | |
no a: Children | すぐに回答できる [a] | |
// 答えられない誰かが自分を見ているなら、共通して見える子の帽子の色が | |
// 1=(2-1)なら回答できる | |
some a: Children | c in a.visible and CountCapNumber [c.visible & a.visible, 1] | |
} | |
pred 回答できる { | |
some c: Children | | |
すぐに回答できる [c] or 少しして回答できる [c] | |
} | |
run 回答できる |
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