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import { ListNode } from "../mod.ts";
export default function removeZeroSumSublists(    head: ListNode | null,): ListNode | null {    const dummy = new ListNode(0, head);
    const map = new Map<number, ListNode>();
    for (let p: ListNode | null = dummy, sum = 0; p; p = p.next) {        sum += p.val;        map.set(sum, p);    }
    for (let p: ListNode | null = dummy, sum = 0; p; p = p.next) {        sum += p.val;        p.next = map.get(sum)?.next ?? null;    }
    return dummy.next;}