Dynamic Trees and Queries

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Given a directed tree with N nodes. You need to process M queries. Each node has a key and a value, a node is referenced by its key. N nodes have keys from 0 to N-1. Root always has the key equal to 0. Queries can be of the following 4 types: 1. Given a key of a node present in the tree, append a child node to it. The new node gets the smallest never-used positive integer as its key. The value of

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solution.cppC++17

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