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August 12, 2011 13:49
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『不等号ナンプレ』(しんや+ドロップ)の表紙の問題をAlloyで解く
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abstract sig Number { | |
data: Number -> one Number, | |
lt : set Number | |
} | |
one sig N1, N2, N3, N4, N5 extends Number {} | |
fact { | |
lt = ^(N1->N2 + N2->N3 + N3->N4 + N4->N5) | |
} | |
pred complete(rows, cols: set Number) { | |
Number in data[rows, cols] | |
} | |
fact { | |
all row: Number | complete[row, Number] | |
all col: Number | complete[Number, col] | |
} | |
pred isLT(a, b : one Number) { | |
a->b in lt | |
} | |
pred isGT(a, b : one Number) { | |
b->a in lt | |
} | |
/* | |
『不等号ナンプレ』(しんや+ドロップ)の表紙の問題 | |
http://www.amazon.co.jp/dp/4537208465 | |
> <5> < | |
v ^ v ^ ^ | |
< > <3< | |
^ ^ v ^ v | |
< > < > | |
v v ^ ^ v | |
<3< < > | |
^ v v v ^ | |
> < >2< | |
*/ | |
pred problem { | |
N1->N3->N5 + | |
N2->N4->N3 + | |
N4->N2->N3 + | |
N5->N4->N2 | |
in data | |
-- 1行目の不等号 | |
isGT[data[N1,N1], data[N1,N2]] | |
isLT[data[N1,N2], data[N1,N3]] | |
isGT[data[N1,N3], data[N1,N4]] | |
isLT[data[N1,N4], data[N1,N5]] | |
-- 2行目の不等号 | |
isLT[data[N2,N1], data[N2,N2]] | |
isGT[data[N2,N2], data[N2,N3]] | |
isLT[data[N2,N3], data[N2,N4]] | |
isLT[data[N2,N4], data[N2,N5]] | |
-- 3行目の不等号 | |
isLT[data[N3,N1], data[N3,N2]] | |
isGT[data[N3,N2], data[N3,N3]] | |
isLT[data[N3,N3], data[N3,N4]] | |
isGT[data[N3,N4], data[N3,N5]] | |
-- 4行目の不等号 | |
isLT[data[N4,N1], data[N4,N2]] | |
isLT[data[N4,N2], data[N4,N3]] | |
isLT[data[N4,N3], data[N4,N4]] | |
isGT[data[N4,N4], data[N4,N5]] | |
-- 5行目の不等号 | |
isGT[data[N5,N1], data[N5,N2]] | |
isLT[data[N5,N2], data[N5,N3]] | |
isGT[data[N5,N3], data[N5,N4]] | |
isLT[data[N5,N4], data[N5,N5]] | |
-- 1列目の不等号 | |
isGT[data[N1,N1], data[N2,N1]] | |
isLT[data[N2,N1], data[N3,N1]] | |
isGT[data[N3,N1], data[N4,N1]] | |
isLT[data[N4,N1], data[N5,N1]] | |
-- 2列目の不等号 | |
isLT[data[N1,N2], data[N2,N2]] | |
isLT[data[N2,N2], data[N3,N2]] | |
isGT[data[N3,N2], data[N4,N2]] | |
isGT[data[N4,N2], data[N5,N2]] | |
-- 3列目の不等号 | |
isGT[data[N1,N3], data[N2,N3]] | |
isGT[data[N2,N3], data[N3,N3]] | |
isLT[data[N3,N3], data[N4,N3]] | |
isGT[data[N4,N3], data[N5,N3]] | |
-- 4列目の不等号 | |
isLT[data[N1,N4], data[N2,N4]] | |
isLT[data[N2,N4], data[N3,N4]] | |
isLT[data[N3,N4], data[N4,N4]] | |
isGT[data[N4,N4], data[N5,N4]] | |
-- 5列目の不等号 | |
isLT[data[N1,N5], data[N2,N5]] | |
isGT[data[N2,N5], data[N3,N5]] | |
isGT[data[N3,N5], data[N4,N5]] | |
isLT[data[N4,N5], data[N5,N5]] | |
} | |
run problem | |
/* | |
solution: | |
4>2<5>1<3 | |
v ^ v ^ ^ | |
1<4>2<3<5 | |
^ ^ v ^ v | |
3<5>1<4>2 | |
v v ^ ^ v | |
2<3<4<5>1 | |
^ v v v ^ | |
5>1<3>2<4 | |
*/ |
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