提交代码
class Solution {
public ListNode removeElements(ListNode head, int val) {
ListNode dummy = new ListNode(0);
dummy.next = head;
ListNode p1 = dummy, p2 = dummy.next;
while (p2!= null) {
while ( p2!= null && p2.val != val) {
p1.next=p2;
p1=p2;
p2=p2.next;
}
if(p2!=null&&p2.val==val) {
while(p2!=null&&p2.val==val)
p2=p2.next;
p1.next=p2;
}
}
return dummy.next;
}
}