ReorderList.java

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 */

// Given a singly linked list L: L0→L1→…→Ln-1→Ln,
// reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→…

// You may not modify the values in the list's nodes, only nodes itself may be changed.

// Example 1:

// Given 1->2->3->4, reorder it to 1->4->2->3.
// Example 2:

// Given 1->2->3->4->5, reorder it to 1->5->2->4->3.


/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
  public void reorderList(ListNode head) {
      
  }
}