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v0.0.0-...-b071cee Latest Latest Go to latest Published: Aug 9, 2023 License: GPL-3.0 Imports: 2 Imported by: 0

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github.com/CodeHanHan/leetcode-go

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README ¶

删除链表的倒数第N个节点

1. 题目描述

给你一个链表，删除链表的倒数第 n 个结点，并且返回链表的头结点。

2. 示例

示例1

输入：head = [1,2,3,4,5], n = 2
输出：[1,2,3,5]

示例2

输入：head = [1], n = 1
输出：[]

示例3

输入：head = [1,2], n = 1
输出：[1]

提示

链表中结点的数目为 sz
1 <= sz <= 30
0 <= Node.val <= 100
1 <= n <= sz

3. 解题

递归找到倒数第n个节点，然后删除之，由于删除的节点有可能是最后一个节点，因此需要前置节点。

递归找到倒数第n个节点的方法是：使用计数量order，初始化为0，每次递归返回就-1，则当order=-n时，就找到了倒数n个节点

快慢指针法

Documentation ¶

Index ¶

type ListNode

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type ListNode ¶

type ListNode struct {
	Val  int
	Next *ListNode
}

func BuildCircleListWithNoHead ¶

func BuildCircleListWithNoHead(list []int, cursor int) *ListNode

BuildCircleListWithNoHead build a circle list, which tail point to list[cursor]

func BuildListWithHead ¶

func BuildListWithHead(data []int) *ListNode

func BuildListWithNoHead ¶

func BuildListWithNoHead(nums []int) *ListNode

func (*ListNode) HasCycle ¶

func (l *ListNode) HasCycle() (bool, *ListNode)

HasCycle check if linklist has cycle structure, if not, return false, nil, if yes, return true and the cycle start node

func (*ListNode) Index ¶

func (l *ListNode) Index(target int) *ListNode

Index return the node which value equals target

func (*ListNode) Len ¶

func (l *ListNode) Len() int

Len return list length, when list has cycle structure, return -1

func (*ListNode) Slice ¶

func (l *ListNode) Slice() []int

Slice return slice which contains all node's values in order.

func (*ListNode) String ¶

func (l *ListNode) String() string

String implements Stringer interface.

func (*ListNode) Tail ¶

func (l *ListNode) Tail() *ListNode

Tail return last list node

Source Files ¶

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