https://leetcode.com/problems/reverse-linked-list-ii/
Given the head of a singly linked list and two integers left and right where left <= right, reverse the nodes of the list from position left to position right, and return the reversed list.
Example 1:
Input: head = [1,2,3,4,5], left = 2, right = 4 Output: [1,4,3,2,5] Example 2:
Input: head = [5], left = 1, right = 1 Output: [5]
Constraints:
The number of nodes in the list is n. 1 <= n <= 500 -500 <= Node.val <= 500 1 <= left <= right <= n
Follow up: Could you do it in one pass?