if (k === n) return '0';
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Robot vacuums are one of the greatest inventions in recent history, and they just keep getting better. Most models these days have self-emptying capacities, smart functions that avoid obstacles, and even pet hair stands no chance against these advanced machines.
系列开篇，写给想要真正掌握未来的前端开发者。
那些“中式梦核”的视频里，画面都是空的——教室、走廊、房间都空无一人。但真正的千禧年并非如此。那是一个热闹、温情的时代，每一个角落都盛满了声音与人情。