题解 | #牛群的身高排序#

import java.util.*;

/*
 * public class ListNode {
 *   int val;
 *   ListNode next = null;
 *   public ListNode(int val) {
 *     this.val = val;
 *   }
 * }
 */

public 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 sortList (ListNode head) {
        // write code here
        ListNode result = new ListNode(-1);
        while (head != null) {
            ListNode pre = result;
            boolean flag = true;
            while (pre.next != null) {
                ListNode curr = pre.next;
                if (curr.val > head.val) {
                    flag = false;
                    pre.next = new ListNode(head.val);
                    pre.next.next = curr;
                    break;
                }
                pre = pre.next;
            }
            if (flag) {
                pre.next  = new ListNode(head.val);
            }
            head = head.next;

        }
        return result.next;
    }
}