Scala的Lazy Quicksort [英] Lazy Quicksort in Scala
本文介绍了Scala的Lazy Quicksort的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
是否可以在Scala中进行这种事情 ?
Is it possible to do this sort of thing in Scala?
推荐答案
def quicksort[A](xs: Stream[A])(implicit o: Ordering[A]): Stream[A] = {
import o._
if (xs.isEmpty) xs else {
val (smaller, bigger) = xs.tail.partition(_ < xs.head)
quicksort(smaller) #::: xs.head #:: quicksort(bigger)
}
}
它也可以用视图来完成,尽管它肯定会慢得多:
It can be done with views as well, though it's bound to be much slower:
def quicksort[A](xs: List[A])(implicit o: Ordering[A]) = {
import o._
def qs(xs: SeqView[A, List[A]]): SeqView[A, Seq[_]] = if (xs.isEmpty) xs else {
val (smaller, bigger) = xs.tail.partition(_ < xs.head)
qs(smaller) ++ (xs.head +: qs(bigger))
}
qs(xs.view)
}
这篇关于Scala的Lazy Quicksort的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文