摘要: 对于一个连通平面图,记 \(F\) 为区域数, \(V\) 为点数,\(E\) 为边数,则有 \(F + V - E = 2\) 例题: \(\texttt{ [THUPC2019]鸽鸽的分割}\) \(\texttt{「USACO 2021.1 Platinum」Paint by Letters} 阅读全文
posted @ 2021-12-11 08:55 klii 阅读(257) 评论(0) 推荐(0)