https://leetcode.com/problems/insertion-sort-list/
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode insertionSortList(ListNode head) {
ListNode dummyHead=new ListNode(Integer.MIN_VALUE);
dummyHead.next=head;
while(head!=null){
if(head.next!=null){
ListNode tmp=head.next;
ListNode pre=dummyHead;
while(pre.next.val<tmp.val){
pre=pre.next;
}
if(pre.next!=tmp){
head.next=tmp.next;
tmp.next=pre.next;
pre.next=tmp;
}else{
head=head.next;
}
}else{
break;
}
}
return dummyHead.next;
}
}