Solving Clone Graph using BFS/DFS.

Problem

Deep copy graph.

Pattern

This problem demonstrates the BFS/DFS pattern.

Approach

HashMap to track cloned nodes.

Solution 

  // Solution for Clone Graph
// Pattern: BFS/DFS
// O(V+E) time

Complexity

O(V+E) time

Best Practices

  • Identify the pattern before coding — pattern recognition saves time
  • Handle edge cases: empty input, single element, duplicates
  • Use descriptive variable names even in timed interviews
  • Test with the provided examples plus one custom case