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import { ListNode } from "../reverse-linked-list/ListNode.ts";
export default function getIntersectionNode(    headA: ListNode | null,    headB: ListNode | null,): ListNode | null {    if (!headA) return null;    if (!headB) return null;    const cache = new Set<ListNode>();    function onnode(node: ListNode) {        if (cache.has(node)) {            return node;        } else {            cache.add(node);            return null;        }    }    let ptr1: ListNode | null = headA;    let ptr2: ListNode | null = headB;    while (ptr2 || ptr1) {        if (Math.random() < 0.5) {            if (!ptr1) continue;            const r = onnode(ptr1);            if (r) return r;            ptr1 = ptr1.next;        } else {            if (!ptr2) continue;
            const r = onnode(ptr2);            if (r) return r;            ptr2 = ptr2.next;        }    }
    return null;}