[Leetcode]147. Insertion Sort List

Sort a linked list using insertion sort.

链表的插入排序

 

思路，递归到链表尾，然后循环插入；

 

 1 /**
 2  * Definition for singly-linked list.
 3  * public class ListNode {
 4  *     int val;
 5  *     ListNode next;
 6  *     ListNode(int x) { val = x; }
 7  * }
 8  */     
 9 class Solution {
10     public ListNode insertionSortList(ListNode head) {
11         if (head==null||head.next==null)
12             return head;
13         head.next = insertionSortList(head.next);
14         ListNode p = head;
15         while (p.next!=null){
16             if (p.val>p.next.val){
17                 int tmp = p.val;
18                 p.val = p.next.val;
19                 p.next.val = tmp;
20             }
21             p = p.next;
22         }
23         return head;
24     }
25 }

 

posted @ 2017-11-03 06:42  SkyMelody  阅读(91)  评论(0)  编辑  收藏  举报