Python coding challenges: "breadth-first-search"

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Trees & Binary Trees medium

Zigzag Level Order Traversal

Implement a function that returns the zigzag level-order traversal of a binary tree.

binary-tree breadth-first-search queue

+25 pts 25m

Trees & Binary Trees medium

Maximum Width of a Binary Tree

Given the root of a binary tree, compute its maximum width (the maximum number of nodes in any level, counting null positions).

binary-tree breadth-first-search queue

+25 pts 25m

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Guide: free Python coding challenges

Practice Python by solving problems

PythonSkillset challenges are hands-on coding exercises from beginner to advanced. Open a challenge, read the problem, write Python in the split-pane editor, and run tests with Pyodide — no install required.

How to use the arena

Pick a category — basics, algorithms, strings, and more
Open a challenge, read the statement, and edit the starter code
Run tests, fix failures, then try a related quiz or tutorial lesson

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.

Python Coding Challenges