Commit 8b0539e

authored

Merge pull request youngyangyang04#629 from qxuewei/master

添加 19.删除链表的倒数第N个节点 Swift版本 & 添加 24. 两两交换链表中的节点 Swift版本

2 parents c6e0a1b + 3e75414 commit 8b0539eCopy full SHA for 8b0539e

File tree

+46

-0

lines changed

+46

-0

lines changed

Lines changed: 25 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -204,6 +204,31 @@ fun removeNthFromEnd(head: ListNode?, n: Int): ListNode? {`
`204`	`204`	`}`
`205`	`205`	```
`206`	`206`
	`207`	`+Swift:`
	`208`	+```swift
	`209`	`+func removeNthFromEnd(_ head: ListNode?, _ n: Int) -> ListNode? {`
	`210`	`+ if head == nil {`
	`211`	`+ return nil`
	`212`	`+ }`
	`213`	`+ if n == 0 {`
	`214`	`+ return head`
	`215`	`+ }`
	`216`	`+ let dummyHead = ListNode(-1, head)`
	`217`	`+ var fast: ListNode? = dummyHead`
	`218`	`+ var slow: ListNode? = dummyHead`
	`219`	`+ // fast 前移 n`
	`220`	`+ for _ in 0 ..< n {`
	`221`	`+ fast = fast?.next`
	`222`	`+ }`
	`223`	`+ while fast?.next != nil {`
	`224`	`+ fast = fast?.next`
	`225`	`+ slow = slow?.next`
	`226`	`+ }`
	`227`	`+ slow?.next = slow?.next?.next`
	`228`	`+ return dummyHead.next`
	`229`	`+}`
	`230`	+```
	`231`	`+`
`207`	`232`	`-----------------------`
`208`	`233`	`* 作者微信:[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)`
`209`	`234`	`* B站视频:[代码随想录](https://space.bilibili.com/525438321)`

Lines changed: 21 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -256,6 +256,27 @@ fun swapPairs(head: ListNode?): ListNode? {`
`256`	`256`	`}`
`257`	`257`	```
`258`	`258`
	`259`	`+Swift:`
	`260`	+```swift
	`261`	`+func swapPairs(_ head: ListNode?) -> ListNode? {`
	`262`	`+ if head == nil \|\| head?.next == nil {`
	`263`	`+ return head`
	`264`	`+ }`
	`265`	`+ let dummyHead: ListNode = ListNode(-1, head)`
	`266`	`+ var current: ListNode? = dummyHead`
	`267`	`+ while current?.next != nil && current?.next?.next != nil {`
	`268`	`+ let temp1 = current?.next`
	`269`	`+ let temp2 = current?.next?.next?.next`
	`270`	`+`
	`271`	`+ current?.next = current?.next?.next`
	`272`	`+ current?.next?.next = temp1`
	`273`	`+ current?.next?.next?.next = temp2`
	`274`	`+`
	`275`	`+ current = current?.next?.next`
	`276`	`+ }`
	`277`	`+ return dummyHead.next`
	`278`	`+}`
	`279`	+```
`259`	`280`
`260`	`281`
`261`	`282`	`-----------------------`

Comments

(0)