23 lines
622 B
MiniZinc
23 lines
622 B
MiniZinc
include "alldifferent.mzn";
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int: n;
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array[1..n] of var 1..n: y; % 每个数值的位置
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array[1..n-1] of var 1..n-1: v; % 差值i的位置
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constraint alldifferent(y);
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constraint alldifferent(v);
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constraint forall(i,j in 1..n where i < j)(
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(y[i] - y[j] = 1 -> v[j-i] = y[j]) /\
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(y[j] - y[i] = 1 -> v[j-i] = y[i])
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);
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constraint abs(y[1] - y[n]) = 1 /\ v[n-1] = min(y[1], y[n]);
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solve :: int_search(y, first_fail, indomain_min, complete)
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satisfy;
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output [ "x = [",] ++
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[ show(i) ++ if j == n then "]\n;" else ", " endif
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| j in 1..n, i in 1..n where j == fix(y[i]) ];
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