Clone Graph

Last updated: June 17, 2026

Quick Overview

Given a reference to a node in a connected undirected graph, return a deep copy of the graph. Tests graph traversal and hash map usage, a recurring Meta interview question.

Meta
Coding & Algorithms
Software Engineer
Meta
June 17, 2026
Software Engineer
Onsite
Coding & Algorithms
Medium

388

0

121 solved


Given a reference to a node in a connected undirected graph, return a deep copy of the graph. Tests graph traversal and hash map usage, a recurring Meta interview question.

How to Approach This
  1. Clarify input constraints and edge cases before writing code.
  2. Walk through your approach verbally and confirm with the interviewer before coding.
  3. Start with a brute force solution, then optimize. Mention time and space complexity.
  4. Test your solution with examples, including edge cases like empty input or duplicates.
  5. Consider common patterns: sliding window, two pointers, hash map, BFS/DFS, dynamic programming.
Sharpen Your Skills on Codemia

Practice similar problems with our interactive workspace, get AI feedback, and track your progress.

Practice DSA Problems
Sample Answer
Problem Analysis

The problem requires us to create a deep copy of an undirected graph, which means we need to replicate both nodes and their connections (edges). This is a classic case for the graph traversal patt...

Approach
  1. Initialization: Start by creating a hash map (dictionary in Python) to keep track of already copied nodes. This will help in avoiding cycles and redundant copies.
  2. Recursive Function: Def...

Submit Your Answer
Markdown supported

Related Questions