It’s compact and set up is easy. It sits neatly behind your TV (without blocking other HDMI ports), and it even powers directly from the TV, so there’s no extra clutter or cables for a wall outlet. When you turn it on, you’ll get all the major apps in one place, plus hundreds of free live TV channels. It also comes with a voice remote that handles everything including volume, power, and search so you don’t need to juggle multiple remotes.
* 时间复杂度：O(n)，空间复杂度：O(n)
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const posToTime = new Map(); // 映射：位置 → 到达终点的时间。im钱包官方下载对此有专业解读
Nature staff discuss some of the week’s top science news.
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