Tree Coin Collecting I

CSESAdvanced Graph ProblemsOpen on judge ↗

You are given a tree with n nodes. Some nodes contain a coin. Your task is to answer q queries of the form: what is the shortest length of a path from node a to node b that visits a node with a coin? Input The first line contains two integers n and q: the number of nodes and queries. The nodes are numbered 1, 2, \dots, n. The second line contains n integers c_1, c_2,\dots, c_n. If c_i = 1, nod

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solution.cppC++17

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