题解 | #对链表进行插入排序#

using System;
using System.Collections.Generic;

/*
public class ListNode
{
    public int val;
    public ListNode next;

    public ListNode (int x)
    {
        val = x;
    }
}
*/

class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param head ListNode类
     * @return ListNode类
     */
    public ListNode insertionSortList(ListNode head) {
        // write code here
        ListNode lnRtn = new ListNode(0);
        while (head != null) {
            ListNode lnRtnD = lnRtn;
            ListNode lnFindPre = null;
            while (lnRtnD.next != null) {
                if (lnRtnD.next != null && lnRtnD.next.val > head.val) {
                    lnFindPre = lnRtnD;
                    break;
                }
                lnRtnD = lnRtnD.next;
            }
            if (lnFindPre != null) {
                ListNode lnTmp = head.next;
                ListNode lnFindN = lnFindPre.next;
                lnFindPre.next = head;
                head.next = lnFindN;
                head = lnTmp;
            } else {
                ListNode lnHN = head.next;
                lnRtnD.next = head;
                head.next = null;
                head = lnHN;
            }
        }
        return lnRtn.next;
    }
}