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摘要: NOI 2020 D1T2 Destiny Task 给定 \(n\) 个点的以 \(1\) 为根的有根树,有 \(m\) 条约束,每条约束包含一个点对 \((u,v)\),满足 \(u\) 是 \(v\) 的祖先,你需要给每条边染成黑白两种颜色,满足对于每条约束,\(u\rightarrow v\ 阅读全文
posted @ 2021-10-17 01:25 feicheng 阅读(40) 评论(0) 推荐(0) 编辑