Sudoku: Difference between revisions

/// Is digit allowed in the square in question? !!! hot path !!!! Array/Array2D no faster and they need explicit copy since not immutable

let constraints (values:Map<_,_>) s d = seq {for p in peers[s] do|> Seq.map (fun p -> values[p] = d}) |> Seq.exists ((=) trued) |> not