five.scala

import scala.collection.Seq
object Main {
  def main(args: Array[String]): Unit = {
    dim(readInt)
  }
  def dim(num: Int): Unit = {
    def put[A](xs: Seq[A]) = println(xs mkString " ")
    def nop(c: Int) = {
      require(c >= 0); List.fill(c){0}
    }
    def tri(n: Int) = {
      val l = n / 2 - 1
      val r = l + (n & 1)
      (0 to l) ++ (r to 0 by -1)
    }
    def row(pos: Int, num: Int) = {
      val z = nop(pos)
      z ::: (if (num - pos * 2 <= 1) num :: Nil
        else num +: nop(num - pos * 2 - 2) :+ num) ::: z
    }
    tri(num).foreach(x => put(row(x, num)))
  }
}