题解 | #排序奇升偶降链表#

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 sortLinkedList (ListNode head) {
        // write code here
        if (head == null)
            return null;
        List<int> lsN = new List<int>();
        ListNode lnR = head;
        while (head != null) {
            int nVal = head.val;
            int nFindIndex = lsN.FindIndex(r => r > nVal);
            if (nFindIndex >= 0)
                lsN.Insert(nFindIndex, nVal);
            else
                lsN.Add(nVal);
            head = head.next;
        }
        head = lnR;
        int nIndex = 0;
        while (head != null) {
            head.val = lsN[nIndex];
            head = head.next;
            nIndex++;
        }
        return lnR;
    }
}