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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/N-queens-problem/MiniZinc/n-queens-problem.minizinc Normal file
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int: n;
array [1..n] of var 1..n: q; % queen in column i is in row q[i]
include "alldifferent.mzn";
constraint alldifferent(q); % distinct rows
constraint alldifferent([ q[i] + i | i in 1..n]); % distinct diagonals
constraint alldifferent([ q[i] - i | i in 1..n]); % upwards+downwards
% search
solve :: int_search(q, first_fail, indomain_min)
satisfy;
output [ if fix(q[j]) == i then "Q" else "." endif ++
if j == n then "\n" else "" endif | i,j in 1..n]