刪除鏈表所有值爲val的節點

題目 https://leetcode-cn.com/problems/remove-linked-list-elements/submissions/

思路就是哨兵模式
以及moveHead的使用

 public ListNode removeElements(ListNode head, int val) {
        ListNode sentinel = new ListNode(-1);
        sentinel.next = head;
        ListNode moveNode = sentinel;
        while(moveNode.next!=null){
            if(moveNode.next.val == val){
                //ListNode delete =moveNode.next; 
                //moveNode.next = delete.next; 
                //delete.next = null;
                moveNode.next = moveNode.next.next;
            }
            else{
                moveNode = moveNode.next;
            }
        }
        return sentinel.next;
    }


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