# Untitled

unknown

fsharp

3 years ago

655 B

2

Indexable

Never

^{}

let getOneByLength ls (len: int) = getByLength ls len |> List.exactlyOne let diff xs ys = Set.difference (Set.ofList xs) (Set.ofList ys) |> Set.toList let intersection xs ys = Set.intersect (Set.ofList xs) (Set.ofList ys) |> Set.toList let exactlyN n xs = let len = List.length xs match len with | len when len = n -> xs | len -> failwithf $"tried getting exactly %A{len} from %A{xs}" let seven = getOneByLength xs 3 let one = getOneByLength xs 2 let four = getOneByLength xs 4 let segment1 = diff seven one |> List.exactlyOne