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MiniZinc

annotation bitdomain(int:nwords);
include "alldifferent.mzn";
int: n;
array [1..n] of var 1..n: q :: bitdomain(n div 32 + 1);
constraint alldifferent(q) :: domain;
constraint alldifferent([ q[i] + i | i in 1..n]) :: domain;
constraint alldifferent([ q[i] - i | i in 1..n]) :: domain;
ann: search_ann;
solve :: search_ann satisfy;
output [ if fix(q[j]) == i then "Q" else "." endif ++
if j == n then "\n" else "" endif | i,j in 1..n]