删除链表中等于给定值 val 的所有节点。

示例:

输入: 1->2->6->3->4->5->6, val = 6输出: 1->2->3->4->5

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1 class Solution { 2  3     public ListNode removeElements(ListNode head, int val) { 4  5         ListNode dummyHead = new ListNode(-1); 6         dummyHead.next = head; 7  8         ListNode prev = dummyHead; 9         while(prev.next != null){10             if(prev.next.val == val)11                 prev.next = prev.next.next;12             else13                 prev = prev.next;14         }15 16         return dummyHead.next;17     }18 }