problem206

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206. Reverse Linked List (Easy)

Given the head of a singly linked list, reverse the list, and return the reversed list.

 

Example 1:

Input: head = [1,2,3,4,5]
Output: [5,4,3,2,1]

Example 2:

Input: head = [1,2]
Output: [2,1]

Example 3:

Input: head = []
Output: []

 

Constraints:

• The number of nodes in the list is the range [0, 5000].
• -5000 <= Node.val <= 5000

 

Follow up: A linked list can be reversed either iteratively or recursively. Could you implement both?

Related Topics

[Linked List]

Similar Questions

1. Reverse Linked List II (Medium)
2. Binary Tree Upside Down (Medium)
3. Palindrome Linked List (Easy)

Documentation

Index

• type ListNode

Types

type ListNode

type ListNode = kit.ListNode

ListNode - Definition for singly-linked list.