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export default function kthToLast(head: ListNode | null, k: number): number {    const r = getKthFromEnd(head, k);    if (r) return r.val;    else return 0;}import getKthFromEnd from "../lian-biao-zhong-dao-shu-di-kge-jie-dian-lcof/index.ts";import { ListNode } from "../reverse-linked-list/ListNode.ts";