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dekker.one
1annotation bitdomain(int:nwords);
2
3include "alldifferent.mzn";
4
5int: n;
6array [1..n] of var 1..n: q :: bitdomain(n div 32);
7
8constraint alldifferent(q) :: domain;
9constraint alldifferent([ q[i] + i | i in 1..n]) :: domain;
10constraint alldifferent([ q[i] - i | i in 1..n]) :: domain;
11
12ann: search_ann;
13
14solve :: search_ann satisfy;
15
16output [ if fix(q[j]) == i then "Q" else "." endif ++
17 if j == n then "\n" else "" endif | i,j in 1..n]