let ``No.135 とりあえず1次元の問題``() =

  let n = stdin.ReadLine() |> int
  let xn =
     stdin.ReadLine().Split(' ')
    |> Array.map (int)
    |> Array.sort

  seq { for i in [2..xn.Length] do yield (xn.[i-1] - xn.[i-2]) }
  |> Seq.min 
  |> stdout.WriteLine
  
``No.135 とりあえず1次元の問題``()