（leetcode)Insertion Sort List

Insertion Sort List

题目描述：

Sort a linked list using insertion sort.

题目分析：

这是利用插入法对链表排序，思路比较简单。直接上代码。

 public ListNode insertionSortList(ListNode head) {        if(head==null||head.next==null)return head;ListNode right=head.next;//未处理节点的头指针ListNode left=head;//已处理节点的头指针left.next=null;while(right!=null){               //查找新节点应插入的位置if(right.val>left.val){while(left.next!=null&&left.next!=right){if(right.val>left.next.val){left=left.next;}else break;}ListNode rightNext=right.next;ListNode leftNext=left.next;left.next=right;right.next=leftNext;right=rightNext;left=head;}else{//新节点要插入头部ListNode rightNext=right.next;right.next=left;//left.next=rightNext;head=right;right=rightNext;left=head;}}return head;}