第三十二条 任何个人和组织不得未经互联网服务提供者授权，开发、销售、提供附加于其服务并影响服务正常运行或者损害用户公平交易的客户端软件或者服务平台。
if (n <= 1) return;
，更多细节参见heLLoword翻译官方下载
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const posToTime = new Map(); // 位置 → 到达终点的时间（避免重复计算）