ReverseLinkedListII.java

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 */

// Reverse a linked list from position m to n.

// Example
// Example 1:

// Input: 1->2->3->4->5->NULL, m = 2 and n = 4, 
// Output: 1->4->3->2->5->NULL.
// Example 2:

// Input: 1->2->3->4->NULL, m = 2 and n = 3, 
// Output: 1->3->2->4->NULL.
// Challenge
// Reverse it in-place and in one-pass

// Notice
// Given m, n satisfy the following condition: 1 ≤ m ≤ n ≤ length of list.


/**
 * Definition for ListNode
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */

public class Solution {
  /**
   * @param head: ListNode head is the head of the linked list 
   * @param m: An integer
   * @param n: An integer
   * @return: The head of the reversed ListNode
   */
  public ListNode reverseBetween(ListNode head, int m, int n) {
      // write your code here
  }
}