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欢迎报名第四届北京大学游戏对抗邀请赛!

用凸包做的请看这里!

Posted by AK47biubiubiu at 2017-01-08 20:13:08 on Problem 1696
http://blog.csdn.net/nyist_tc_lyq/article/details/54236282 学识有限,大神勿喷!

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