HBC24141迁徙过程中的河流,贪心,动态规划,区间dp[USACO 2011 Dec G]Grass Planting题解

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Farmer John has N barren pastures (2

Farmer John has N barren pastures (2 <= N <= 100,000) connected by N-1  bidirectional roads, such that there is exactly one path between any two  pastures.  Bessie, a cow who loves her grazing time, often complains about  how there is no grass on the roads between pastures.  Farmer John loves  Bessie very much, and today he is finally going to plant grass on the roads.  He will do so using a procedure consisting of M steps (1 <= M <= 100,000). At each step one of two things will happen: - FJ will choose two pastures, and plant a patch of grass along each road in between the two pastures, or, - Bessie will ask about how many patches of grass on a particular road, and  Farmer John must answer her question. Farmer John is a very poor counter -- help him answer Bessie's questions!

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标签： HBC24141迁徙过程中的河流 贪心 动态规划 区间dp[USACO 2011 Dec G]Grass Planting题解