CF258E Little Elephant and Tree

The Little Elephant loves trees very much, he especially loves root trees. He's got a tree consisting of $ n $ nodes (the nodes are numbered from 1 to $ n $ ), with root at node number $ 1 $ . Each node of the tree contains some list of numbers which initially is empty. The Little Elephant wants to apply $ m $ operations. On the $ i $ -th operation $ (1

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