Solution -「洛谷 P3267」「JLOI 2016」「SHOI 2016」侦察守卫
DescriptionLink.给你一棵树,放置守卫在某个点上面需要一定代价和一定的有效范围。让你覆盖若干指定点,求最小代价Solution算法标签:$\ \ \ \ \ \ \ \ \ $ 树...
In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.