Reverse Linked List
Examples
Example 1:
Input: head = [0,1,2,3]
Output: [3,2,1,0]
Example 2:
Input: head = []
Output: []
Linked List
Example 1:
Input: head = [0,1,2,3]
Output: [3,2,1,0]
Example 2:
Input: head = []
Output: []
Given the beginning of a singly linked list head, reverse the list, and return the new beginning of the list.
0 <= The length of the list <= 1000.-1000 <= Node.val <= 1000