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MiniZinc

int: n;
array [1..n] of var 1..n: q; % i列的皇后在行q[i]
include "alldifferent.mzn";
constraint alldifferent(q); % 不同行
constraint alldifferent([ q[i] + i | i in 1..n]); % 不同对角线
constraint alldifferent([ q[i] - i | i in 1..n]); % 上+下
% 搜索
solve :: int_search(q, first_fail, indomain_min, complete)
satisfy;
output [ if fix(q[j]) == i then "Q" else "." endif ++
if j == n then "\n" else "" endif | i,j in 1..n]