[Project Euler] Problem 16

Problem 16

java.math.BigIntegerを使うだけ。

object P016 {
  def main(args:Array[String]) {
    val v2 = new BigInt(java.math.BigInteger.valueOf(2L))
    val r = v2.pow(1000).toString.toCharArray.map{c => c-'0'}.foldLeft(0)(_+_)
    println(r)
  }
}