SPOJ Query on a tree II （树剖||倍增LCA）（占位）

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You are given a tree (an undirected acyclic connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. Each edge has an integer value assigned to it, representing its length. We will ask you to perfrom some instructions of the following form: D…

【SPOJ Query on a tree 】 (树链剖分)

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spoj 913 Query on a tree II (倍增lca)

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LCA SP913 QTREE2 - Query on a tree II

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You are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3-N-1. We will ask you to perfrom some instructions of the following form: CHANGE i ti : change the cost of the i-th edge to ti or QUERY a b : ask for…