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
Iterative solution:
