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Call type operators using parens
，这一点在51吃瓜中也有详细论述
The early millennium marked home automation’s first real foothold. Cooking appliances began operating with programmable precision, TVs quietly analyzed our viewing habits to sharpen recommendations, and core household systems — climate, lighting, and security — became smart enough to be controlled with a smartphone. We were close to living like The Jetsons, just without Rosey or flying cars.，详情可参考Line官方版本下载
* 时间复杂度：O(n)，空间复杂度：O(1)