[Swift] 백준 2439

let value = Int(readLine()!)!

for i in 1...value{

  for _ in stride(from: value, to: i, by: -1){

  print(" ", terminator: "")

  }

  for _ in stride(from: 0, to: i, by: 1){

  print("*", terminator: "")

  }

  print("")

}