leetcode23

 1 public class Solution
 2     {
 3         public ListNode MergeKLists(ListNode[] lists)
 4         {
 5             var ary = new List<int>();
 6             for (var i = 0; i < lists.Length; i++)
 7             {
 8                 var l = lists[i];
 9                 while (l != null)
10                 {
11                     ary.Add(l.val);
12                     l = l.next;
13                 }
14             }
15             ary = ary.OrderBy(x => x).ToList();
16             ListNode tail = null;
17             for (var i = ary.Count - 1; i >= 0;i--)
18             {
19                 var head = new ListNode(ary[i]);
20                 head.next = tail;
21                 tail = head;
22             }
23             return tail;
24         }
25     }
投机取巧的办法，时间复杂度还可以，空间占用比较多。