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| package main
type ListNode struct{ Val int Next *ListNode }
func sortInList( head *ListNode ) *ListNode { if head == nil || head.Next == nil { return head }
fast, slow := head, head for fast.Next != nil && fast.Next.Next != nil { fast = fast.Next.Next slow = slow.Next }
second_head := slow.Next slow.Next = nil l1, l2 := sortInList(head), sortInList(second_head)
dummy := &ListNode{} pre := dummy
for l1 != nil && l2 != nil { if l1.Val > l2.Val { pre.Next = l2 l2 = l2.Next } else { pre.Next = l1 l1 = l1.Next } pre = pre.Next }
if l1 == nil { pre.Next = l2 } if l2 == nil { pre.Next = l1 }
return dummy.Next }
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