Previous Smaller Element
Find the nearest previous index with a smaller value for every element in an array.
Next greater element II
For each element in a circular array, find the next greater element (NGE) to its right, wrapping around.
Online Stock Span
Implement StockSpanner.next(price) that returns the maximum number of consecutive days (including today) with price <= current price.
Next Greater Element
Return a list where each position holds the next greater element to the right, or -1 if none exists.
Daily Temperatures
Given a list of daily temperatures, return for each day how many days until a warmer temperature appears.
Remove K Digits Stack
Remove k digits from a non-negative integer string to produce the smallest possible number using a stack-based approach.
Buildings with ocean view
Given building heights, return sorted indices of buildings that have a clear view of the ocean to their right.
Sum of Subarray Minimums
Given an integer array, sum the minimum of all contiguous subarrays modulo 10^9+7.
Showing 8 challenges
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.