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The 4th line of input is -1 3, which shows the left and right child of node 3. Nodes start from 1. So there is a cycle 3 -> 3. Therefore it is not a tree.
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The 4th line of input is
-1 3, which shows the left and right child of node 3. Nodes start from 1. So there is a cycle 3 -> 3. Therefore it is not a tree.