this repo has no description
dekker.one
1include "alldifferent.mzn";
2
3int: n;
4
5array[1..n] of var 1..n: y; % 每个数值的位置
6array[1..n-1] of var 1..n-1: v; % 差值i的位置
7
8constraint alldifferent(y);
9constraint alldifferent(v);
10constraint forall(i,j in 1..n where i < j)(
11 (y[i] - y[j] = 1 -> v[j-i] = y[j]) /\
12 (y[j] - y[i] = 1 -> v[j-i] = y[i])
13 );
14
15constraint abs(y[1] - y[n]) = 1 /\ v[n-1] = min(y[1], y[n]);
16
17solve :: int_search(y, first_fail, indomain_min, complete)
18 satisfy;
19
20output [ "x = [",] ++
21 [ show(i) ++ if j == n then "]\n;" else ", " endif
22 | j in 1..n, i in 1..n where j == fix(y[i]) ];