数据有问题，请管理员更正谢谢！！！

P2742 [USACO5.1] 圈奶牛Fencing the Cows /【模板】二维凸包

@[3269224138刘](/space/show?uid=21636) 感谢反馈，已更正
by FlierKing @ 2017-05-09 14:10:30

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