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/*

Author: King, wangjingui@outlook.com

Date: Jan 02, 2015

Problem: Insertion Sort List

Difficulty: Easy

Source: http://oj.leetcode.com/problems/insertion-sort-list/

Notes:

Sort a linked list using insertion sort.

Solution: ...

*/

/**

* Definition for singly-linked list.

* public class ListNode {

* int val;

* ListNode next;

* ListNode(int x) {

* val = x;

* next = null;

* }

* }

*/

public class Solution {

public ListNode insertionSortList(ListNode head) {

if (head == null || head.next == null) return head;

ListNode dummy = new ListNode(Integer.MIN_VALUE);

dummy.next = head;

ListNode cur = head.next;

head.next = null;

while (cur != null) {

ListNode tmp = dummy;

while (tmp.next != null && tmp.next.val <= cur.val) tmp = tmp.next;

ListNode next = cur.next;

cur.next = tmp.next;

tmp.next = cur;

cur = next;

}

return dummy.next;

}

}