Clone Graph
Given a reference of a node in a connected undirected graph. Return a deep copy (clone) of the graph.
Clone Graph

Given a reference of a node in a connected undirected graph. Return a deep copy (clone) of the graph.

Example 1:
Input: [[2,4],[1,3],[2,4],[1,3]]
Output: [[2,4],[1,3],[2,4],[1,3]]
Input
arr =[[2,4],[1,3],[2,4],[1,3]]

Checking if node 1 is cloned

1

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Variables
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