From 3e754148100b7bf5894e9ab543121613fb0c8cb2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9E=81=E5=AE=A2=E5=AD=A6=E4=BC=9F?= Date: Fri, 20 Aug 2021 13:37:18 +0800 Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=2019.=E5=88=A0=E9=99=A4?= =?UTF-8?q?=E9=93=BE=E8=A1=A8=E7=9A=84=E5=80=92=E6=95=B0=E7=AC=ACN?= =?UTF-8?q?=E4=B8=AA=E8=8A=82=E7=82=B9=20Swift=E7=89=88=E6=9C=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...0019.删除链表的倒数第N个节点.md | 25 +++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/problems/0019.删除链表的倒数第N个节点.md b/problems/0019.删除链表的倒数第N个节点.md index 3e1a682c..4d3e57db 100644 --- a/problems/0019.删除链表的倒数第N个节点.md +++ b/problems/0019.删除链表的倒数第N个节点.md @@ -204,6 +204,31 @@ fun removeNthFromEnd(head: ListNode?, n: Int): ListNode? { } ``` +Swift: +```swift +func removeNthFromEnd(_ head: ListNode?, _ n: Int) -> ListNode? { + if head == nil { + return nil + } + if n == 0 { + return head + } + let dummyHead = ListNode(-1, head) + var fast: ListNode? = dummyHead + var slow: ListNode? = dummyHead + // fast 前移 n + for _ in 0 ..< n { + fast = fast?.next + } + while fast?.next != nil { + fast = fast?.next + slow = slow?.next + } + slow?.next = slow?.next?.next + return dummyHead.next +} +``` + ----------------------- * 作者微信:[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw) * B站视频:[代码随想录](https://space.bilibili.com/525438321)