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This is the problem for copying nodes, which helps you understand the concept of referencing a node & copying the node (creating a new node from the existing one).
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👉 Perform recursion DFS with the correct escape condition and handling of NoneType.
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'''
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"""
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# Definition for a Node.
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class Node:
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def __init__(self, val = 0, neighbors = None):
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self.val = val
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self.neighbors = neighbors if neighbors is not None else []
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