[leetcode] Remove Linked List Element

one mistake I kept on making is forget to move the head pointer...

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public class Solution { public ListNode removeElements(ListNode head, int val) { ListNode dummy = new ListNode(-1); dummy.next = head; ListNode previous = dummy; while (head != null){ ListNode next = head.next; if (head.val == val){ previous.next = head.next; head.next = null; }else{ previous = head; } head = next; } return dummy.next; } }