题目来自 2018 清华大学学生程序设计竞赛暨高校邀请赛（THUPC2018），Git 仓库地址：https://github.com/wangyurzee7/THUPC2018 ，感谢Pony.ai对此次比赛的支持。
QOJ.ac
QOJ
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Time Limit:
12 s
Memory Limit:
2048 MB
Total points:
100
#2841. 赛艇
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