LeetCode OJ:Insertion Sort List

Insertion Sort List

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Sort a linked list using insertion sort.

/** * 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 *p=head;ListNode *nh=new ListNode(0);while(p!=NULL){ListNode *q=p->next;insert(nh,p);p=q;}return nh->next;}void insert(ListNode *head,ListNode *cur){ListNode *p=head;ListNode *q=head->next;while(q!=NULL&&q->val<cur->val){p=q;q=q->next;}p->next=cur;cur->next=q;}};