// ⚠️ 易错点4：循环条件写right = 0（会导致right-1越界），或把<=写成<（漏判相等的有序情况）
by splitting it in half: the astute reader will note that the size of a bucket is 16LL<<bucket and each larger bucket is twice the size of the
，这一点在91视频中也有详细论述
在这里也祝福它，不论驶向哪里，下一个航程，一帆风顺。。服务器推荐对此有专业解读
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The result from Step 2 is a high-level route – a sequence of shortcuts connecting border points.