import { default } from "https://deno.land/x/masx200_leetcode_test@10.6.3/flatten-a-multilevel-doubly-linked-list/index.ts";
Parameters
head: Node | null
import { default } from "https://deno.land/x/masx200_leetcode_test@10.6.3/flatten-a-multilevel-doubly-linked-list/index.ts";