题目地址：http://acm.hdu.edu.cn/showproblem.php?pid=3685
思路：先求出多边形重心，放置的边一定为凸包边。判断重心是否落在边之间（求点到直线与点到线段的距离，判断）。
4
0 0
4 0
8 4
4 4
注意这种情况，重心不能在凸包边端点的垂线上。
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