链表插入排序

题目

用插入排序对链表排序
样例
Given 1->3->2->0->null, return 0->1->2->3->null

解题

public class Solution {
    /** * @param head: The first node of linked list. * @return: The head of linked list. */
    public ListNode insertionSortList(ListNode head) {
        // write your code here
        ListNode dummy = new ListNode(0);

        while (head != null) {
            ListNode node = dummy;// 待插入链表
            //找到插入位置
            while (node.next != null && node.next.val < head.val) {
                node = node.next;
            }
            ListNode temp = head.next;
            head.next = node.next;
            node.next = head;
            head = temp;
        }

        return dummy.next;
    }
}