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这题O（n）的做法好像是错的O（n）的朋友试试这组数据 5 -7 0 -5 1 -1 5 -2 8 -8 4 5 0 7 1 5 5 1 8 2 4 8 5 0 -7 4 -8 8 -2 5 -1 1 -5 -1 答案都是15.00。 这是3个完全一样的凸包，后两个都可以通过第一个旋转和反转得到。 Followed by:
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