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import { ListNode } from "../reverse-linked-list/ListNode.ts";
export default function getDecimalValue(head: ListNode | null): number {    if (head?.val === 0) return getDecimalValue(head.next);    if (!head) return 0;    let ans = 0;    while (head) {        ans = ans * 2 + head.val;        head = head.next;    }    return ans;}