public ListNode RemoveElements(ListNode head, int val)
{
ListNode pre = new ListNode(0);
pre.next = head;
var temp = head;
ListNode prev = pre;
while (temp != null)
{
if (temp.val == val)
{
prev.next = temp.next;
}
else
{
prev = prev.next;
}
temp = temp.next;
}
return(pre.next);
}
public ListNode(int val = 0, ListNode next = null)
{
this.val = val;
this.next = next;
}
