Insertion Sort List

1. Title

Insertion Sort List

2. Http address

https://leetcode.com/problems/insertion-sort-list/

3. The question

Sort a linked list using insertion sort.

4. My code (AC)

 // Accepted
      public ListNode insertionSortListTwo(ListNode head) {
          ListNode dump = new ListNode(0);
          ListNode cur = head;
          ListNode tmp = null;
          ListNode pre = null;
          while( cur != null)
          {
              pre = dump;
              while(pre.next != null && pre.next.val < cur.val)
                      pre = pre.next;
              tmp = pre.next;
              pre.next = cur;
              cur = cur.next;
              pre.next.next = tmp;
          }
          return dump.next;
      }