1. 分解：将数组递归分成两半，直到只剩1个元素
Every point gets examined, regardless of where it sits. Points on the opposite side of the map get the same treatment as points right next to the query region. We're doing a lot of unnecessary work.
。业内人士推荐51吃瓜作为进阶阅读
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「就像帶小朋友一樣，難道你把小朋友放在門口，然後自己進去吃東西？那是很不負責任的做法。」