摘要: \(\text{Problem}:\)[NOI2020] 命运 \(\text{Solution}:\) 关键性质:若满足限制 \((u,v_{1})\),有 \(dep_{v2}<dep_{v1}\) 且 \(v_{2}\) 是 \(v_{1}\) 的祖先,那么满足限制 \((u,v_{2})\) 阅读全文
posted @ 2021-05-10 19:38 zkdxl 阅读(44) 评论(0) 推荐(0) 编辑