Cycle Detection in Undirected Graph
Write a function that detects if an undirected graph contains a cycle.
Find center of star graph
Write a function that finds the center node of a star graph from its list of edges in O(1) time.
Showing 2 challenges · easy · Graphs & Graph Algorithms
Graphs & Graph Algorithms — Python coding challenges
What you will find here
This page lists graphs & graph algorithms challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.
Challenges vs tutorials and quizzes
Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.