Haskell

Prelude> :l demos/queens
Queens> queens 8
[[1,5,8,6,3,7,2,4],[1,6,8,3,7,4,2,5],[1,7,4,6,8,2,5,3],[1,7,5,8,2,4,6,3],[2,4,6,
8,3,1,7,5],[2,5,7,1,3,8,6,4],[2,5,7,4,1,8,6,3],[2,6,1,7,4,8,3,5],[2,6,8,3,1,4,7,
5],[2,7,3,6,8,5,1,4],[2,7,5,8,1,4,6,3],[2,8,6,1,3,5,7,4],[3,1,7,5,8,2,4,6],[3,5,
2,8,1,7,4,6],[3,5,2,8,6,4,7,1],[3,5,7,1,4,2,8,6],[3,5,8,4,1,7,2,6],[3,6,2,5,8,1,
7,4],[3,6,2,7,1,4,8,5],[3,6,2,7,5,1,8,4],[3,6,4,1,8,5,7,2],[3,6,4,2,8,5,7,1],[3,
6,8,1,4,7,5,2],[3,6,8,1,5,7,2,4],[3,6,8,2,4,1,7,5],[3,7,2,8,5,1,4,6],[3,7,2,8,6,
4,1,5],[3,8,4,7,1,6,2,5],[4,1,5,8,2,7,3,6],[4,1,5,8,6,3,7,2],[4,2,5,8,6,1,3,7],[
4,2,7,3,6,8,1,5],[4,2,7,3,6,8,5,1],[4,2,7,5,1,8,6,3],[4,2,8,5,7,1,3,6],[4,2,8,6,
1,3,5,7],[4,6,1,5,2,8,3,7],[4,6,8,2,7,1,3,5],[4,6,8,3,1,7,5,2],[4,7,1,8,5,2,6,3]
,[4,7,3,8,2,5,1,6],[4,7,5,2,6,1,3,8],[4,7,5,3,1,6,8,2],[4,8,1,3,6,2,7,5],[4,8,1,
5,7,2,6,3],[4,8,5,3,1,7,2,6],[5,1,4,6,8,2,7,3],[5,1,8,4,2,7,3,6],[5,1,8,6,3,7,2,
4],[5,2,4,6,8,3,1,7],[5,2,4,7,3,8,6,1],[5,2,6,1,7,4,8,3],[5,2,8,1,4,7,3,6],[5,3,
1,6,8,2,4,7],[5,3,1,7,2,8,6,4],[5,3,8,4,7,1,6,2],[5,7,1,3,8,6,4,2],[5,7,1,4,2,8,
6,3],[5,7,2,4,8,1,3,6],[5,7,2,6,3,1,4,8],[5,7,2,6,3,1,8,4],[5,7,4,1,3,8,6,2],[5,
8,4,1,3,6,2,7],[5,8,4,1,7,2,6,3],[6,1,5,2,8,3,7,4],[6,2,7,1,3,5,8,4],[6,2,7,1,4,
8,5,3],[6,3,1,7,5,8,2,4],[6,3,1,8,4,2,7,5],[6,3,1,8,5,2,4,7],[6,3,5,7,1,4,2,8],[
6,3,5,8,1,4,2,7],[6,3,7,2,4,8,1,5],[6,3,7,2,8,5,1,4],[6,3,7,4,1,8,2,5],[6,4,1,5,
8,2,7,3],[6,4,2,8,5,7,1,3],[6,4,7,1,3,5,2,8],[6,4,7,1,8,2,5,3],[6,8,2,4,1,7,5,3]
,[7,1,3,8,6,4,2,5],[7,2,4,1,8,5,3,6],[7,2,6,3,1,4,8,5],[7,3,1,6,8,5,2,4],[7,3,8,
2,5,1,6,4],[7,4,2,5,8,1,3,6],[7,4,2,8,6,1,3,5],[7,5,3,1,6,8,2,4],[8,2,4,1,7,5,3,
6],[8,2,5,3,1,7,4,6],[8,3,1,6,2,5,7,4],[8,4,1,3,6,2,7,5]]     
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