Sort a linked list using insertion sort.
对链表插入排序，没啥好说的。
代码语言：javascript复制/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* insertionSortList(ListNode* head) {
ListNode *res = new ListNode(INT_MIN);
while(head)
{
ListNode *p = new ListNode(head->val);
ListNode *q = res;
while(q)
{
if(!q->next)
{
q->next = p;
break;
}
else if(q->val <= p->val && p->val <= q->next->val)
{
p->next = q->next;
q->next = p;
break;
}
q = q->next;
}
head = head->next;
}
return res->next;
}
};
