题目来源：https://codeforces.com/group/aUVPeyEnI2/contest/229510https://codeforces.com/group/aUVPeyEnI2/co
阅读背景：
2016-2017 ACM-ICPC, NEERC, Northern Subregional Contest Problem I. Integral Polygons
来源：互联网
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