Moderate Graphs Question 120 of 224

How do you clone an undirected graph?

DSA interview set · Speak this in 60–90 seconds · Faridabad & Delhi NCR

Key"user_id"

Hashslot 17

Valuethe record

Hash original node to clone.

Why interviewers care about Graphs:

This is a process

question about Graphs.

Panels listen for order,

trade-offs, and what you would actually do on a DSA project - not buzzwords.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

Before you speak the answer, walk the interviewer through these steps:

1
Define it
Hash original node to clone.
2
DFS or BFS: create
the clone on first visit, then iterate neighbors and attach cloned neighbors.
3
Time is O(V+E) and
space is O(V) for the map and recursion/queue.
4
Forgetting the map causes
infinite loops on cycles.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

Here's a short line you can speak, broken into clear beats:

Say this line

“Time is O(V+E) and space is O(V) for the map and recursion/queue.”

Break into beats

TimeisOVEand

Speaking order

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Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Hash original node to clone. DFS or BFS: create the clone on first visit, then iterate neighbors and attach cloned neighbors.