RE: [Haskell-cafe] Fun with Haskell, runST, MArray, and a few queens.

David Sankel wrote:

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Try this Queens.hs

Thanks for the program, but how does one decipher the output?

The Nth item in each list is the column of the queen which is in row N (or the row of the queen which is in column N; the transpose of a valid solution must also be a valid solution). If you prefer (row, column) pairs, use e.g.: main = print $ map (zip [1..]) $ queens 10 -- Glynn Clements