func doQuickSort(head *list.Node) (first *list.Node, last *list.Node) {
first, last = sortOnlyTwo(head)
if first == nil {
var left, center, right, _ = partition(head)
var knot *list.Node
first, knot = doQuickSort(left)
knot.Next = center
center.Next, last = doQuickSort(right)
}
return first, last
}
func doIntroSort(head *list.Node, life uint) (first *list.Node, last *list.Node) {
first, last = sortOnlyTwo(head)
if first == nil {
if life == 0 {
first, last = doMergeSort(head)
} else {
var left, center, right, _ = partition(head)
var knot *list.Node
first, knot = doIntroSort(left, life-1)
knot.Next = center
center.Next, last = doIntroSort(right, life-1)
}
}
return first, last
}
//内省排序，基于快速排序的一种混合排序算法，不具有稳定性。
//主要限制了QuickSort的最坏情况，适合递归实现(没有爆栈风险)。
func IntroSort(head *list.Node) *list.Node {
if head == nil {
return nil
}
if first, _ := sortOnlyTwo(head); first != nil {
return first
}
var left, center, right, size = partition(head)
var life uint
for life = 12; size != 0; life++ {
size /= 2
}
var knot *list.Node
head, knot = doIntroSort(left, life)
knot.Next = center
center.Next, _ = doIntroSort(right, life)
return head
}
