Grokking the Coding Interview: Patterns for Coding Questions
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Solution: Clone Graph

Problem Statement

Given a reference of a node in a connected undirected graph, return a deep copy (clone) of the graph. Each node in the graph contains a value (int) and a list (List[Node]) of its neighbors.

Example 1:

Input:

    1--2
    |  |
    4--3

Expected Output:

    1--2
    |  |
    4--3

Explanation: The graph has four nodes with the following connections:

  • Node 1 is connected to nodes 2 and 4.
  • Node 2 is connected to nodes 1 and 3.
  • Node 3 is connected to nodes 2 and 4.
  • Node 4 is connected to nodes 1 and 3.

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