2019年8月24日
#（树形DP+容斥原理）洛谷P3047 [USACO12FEB]附近的牛Nearby Cows（提高+/省选-）
摘要： 题目描述 Farmer John has noticed that his cows often move between nearby fields. Taking this into account, he wants to plant enough grass in each of his f 阅读全文
posted @ 2019-08-24 00:07 会飞的字符串 阅读(172) 评论(0) 推荐(0)