DouKaku?

import    java.text.SimpleDateFormat
import    java.util.Calendar

class CMagicNumber(n:Int) {
    val    m:Int = n * n
    val    a:Int = n * (n * n + 1) / 2
    def calc:Int = {
        def _calc(p:Int,c:Int,s:Int,r:List[Int],g:Int):Int = r match {
                case List() => g + 1
                case _ => c match {
                        case 0 => _calc(r.head,1,r.head,r.tail, g)
                        case _ => r.filter { d => d > p }.foldLeft(g) { (g,d) =>
                                ((c == n - 1) && (s + d == a)) match {
                                    case true => _calc(0,0,0,r.filter { e => e != d },g)
                                    case _ => (d + s >= a) match {
                                            case true => g
                                            case _ => _calc(d,c + 1,s + d,r.filter { e => e != d },g)
                                        }
                                }
                            }
                    }
            }
        _calc(0,0,0,(1 to m).toList,0)
    }
}
object MagicNumber {
    def printTime:Unit = println((new SimpleDateFormat("yyyy/MM/dd HH:mm:ss")).format(Calendar.getInstance.getTime))
    def main(args:Array[String]):Unit = {
        try {
            printTime
            printf("result:%d\n",(new CMagicNumber(args.length match { case 1 => args(0).toInt; case _ => 5 })).calc)
            printTime
        } catch {
            case e => e.printStackTrace
        }
    }
}