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import { ListNode } from "../reverse-linked-list/ListNode.ts";
function removeDuplicateNodes(head: ListNode | null): ListNode | null {    if (!head) return null;    const occured = new Set<number>();
    occured.add(head.val);
    const result = new ListNode(head.val);    let cur = result;
    while (head) {        if (!occured.has(head.val)) {            occured.add(head.val);
            cur.next = new ListNode(head.val);            cur = cur.next;        }        head = head.next;    }    return result;}export default removeDuplicateNodes;